CN104586378A - Method and device for outputting fetal heart rate curve - Google Patents
Method and device for outputting fetal heart rate curve Download PDFInfo
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
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Abstract
The invention is suitable for the technical field of medical signal processing, and provides a method and a device for outputting a fetal heart rate curve. The method comprises the following steps of according to an original signal collected by fetal heart monitoring equipment, generating the fetal heart rate curve; extracting the fetal heart rate curve within a specified period of time; measuring the baseline parameters of the fetal heart rate curve within the specified period of time, wherein the baseline parameters include fetal heart rate baseline values; simultaneously outputting the fetal heart rate curve and the measured baseline parameters. The method has the advantage that the baseline parameters of the fetal heart rate curve can be automatically measured, and the baseline parameters can be marked in a fetal heart rate curve diagram according to the measuring result, so the outputted fetal heart rate curve can visually and correctly display the various parameters of the fetal heart rate curve, and a medical staff can conveniently analyze the baseline of the fetal heart rate according to the outputted fetal heart rate curve, and the analysis accuracy of the fetal heart rate is improved.
Description
Technical Field
The invention belongs to the technical field of medical signal processing, and particularly relates to an output method and device of a fetal heart rate curve.
Background
The fetal heart rate baseline is one of important indexes for reflecting the fetal central nerve development condition and indicating the intrauterine safety risk of the fetus, and is also the first parameter to be determined when medical personnel analyze a fetal heart rate curve. The normal range for the fetal heart rate baseline is typically between 110bpm and 160bpm, and the fetal heart rate baseline gradually decreases as the gestational week increases. Clinically, attention should be paid to overhigh or overlow fetal heart rate baseline, the cause of the abnormality must be found immediately, and whether the abnormality has clinical significance or not is judged, so that a basis is provided for taking intervention measures. For example, in pregnancy, congenital heart disease should be considered if the fetal heart rate baseline drops below 100 bpm; in the delivery period, the abnormal fetal heart rate baseline is a warning signal of fetal distress, and at the moment, the reason for the abnormality should be found as soon as possible and certain intervention measures should be taken to remove the abnormality so as to ensure the safety of the fetus. Meanwhile, the fetal heart rate baseline is also the basis for analyzing the fetal heart rate curve by medical staff, and the data analysis processes of fetal heart rate baseline variation, fetal heart rate acceleration, fetal heart rate deceleration, sinusoidal trend and the like can be completed on the basis of completing the analysis of the fetal heart rate baseline.
However, when the fetal heart rate curve is output at present, no matter the fetal heart rate curve is displayed at a central station of obstetrical department or displayed on a bedside machine, or printed and output is performed on printing paper, due to the fact that the space of a screen or the printing paper is limited, the fetal heart rate curve can be compressed to different degrees, the fetal heart rate curve is difficult to identify a fetal heart rate baseline due to deformation, or partial detailed information of fetal heart rate change is hidden, and the fetal heart rate baseline variation cannot be accurately identified; meanwhile, under the prior art, a doctor can only rely on naked eyes to identify a fetal heart rate baseline, which may result in inaccurate identification, for example, the clinical definition of the fetal heart rate baseline requires to calculate the average value of the fetal heart rate of at least 2 minutes of baseline segments, and under the condition that the fetal heart rate curve is compressed and only depends on the naked eyes for identification, medical staff cannot identify whether the baseline segments exceed 2 minutes at all, and further cannot accurately calculate the average value of the fetal heart rate, and can only judge the fetal heart rate curve by experience, thus the condition that the fetal heart rate baseline is inaccurate in judgment is caused, further the judgment of the medical staff on other parameters in the fetal heart rate curve is influenced, and the judgment of the medical staff on the whole fetal heart rate curve is influenced, which may result in.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for outputting a fetal heart rate curve, and aims to solve the problem that in the prior art, the fetal heart rate curve is compressed during output, so that the analysis result of a fetal heart rate baseline is inaccurate.
The embodiment of the invention is realized in such a way that the method for outputting the fetal heart rate curve comprises the following steps:
generating a fetal heart rate curve according to an original signal acquired by fetal heart monitoring equipment;
extracting the fetal heart rate curve in a specified time period;
measuring a baseline parameter of the fetal heart rate curve for the specified time period;
and simultaneously outputting the fetal heart rate curve and the measured baseline parameters.
Optionally, the measuring the baseline parameters of the fetal heart rate curve for the specified time period further comprises:
generating a line segment A parallel to a time axis and having an ordinate of the baseline fetal heart rate value within the specified time period of the fetal heart rate curve.
Optionally, the baseline parameters include a fetal heart rate baseline variability cycle, and the measuring the baseline parameters of the fetal heart rate curve for the specified time period includes:
extracting an intersection point of the line segment A and the fetal heart rate curve of the specified time period;
cutting the fetal heart rate curve of the specified time period according to a preset time length;
respectively calculating the number of the intersection points in each preset time length;
and dividing the number of all the calculated intersection points by 2, and then averaging to obtain the fetal heart rate baseline variation cycle of the fetal heart rate curve in the specified time period.
Optionally, the baseline parameters include a fetal heart rate baseline variation amplitude value, and the measuring the baseline parameters of the fetal heart rate curve for the specified time period includes:
cutting the fetal heart rate curve of the specified time period according to a preset time length;
respectively calculating the difference value between the maximum value and the minimum value of the fetal heart rate in each preset time period;
and averaging all the calculated difference values to obtain the fetal heart rate baseline variation amplitude value of the fetal heart rate curve in the specified time period.
Optionally, the baseline parameters further comprise sinusoidal trend markers, and the measuring the baseline parameters of the fetal heart rate curve for the specified time period comprises:
calculating the fetal heart rate curve and the sinusoidal equation of the specified time period based on a least square methodWherein V is the fetal heart rate baseline variation amplitude, C is the fetal heart rate baseline variation cycle, and H is the fetal heart rate baseline value H;
judging whether the error sum is within a preset threshold range;
if the error sum is within a preset threshold value range, generating a mark that the fetal heart rate curve is in a sine trend;
and if the error sum is not within the preset threshold value range, generating a mark that the fetal heart rate curve does not show a sine trend.
Optionally, the simultaneously outputting the fetal heart rate curve and the measured baseline parameter comprises:
generating an independent time axis in a designated area, wherein the time axis corresponds to the time axis of the fetal heart rate curve one by one in time, and the designated area comprises a blank area between the fetal heart rate curve and the uterine contraction strength curve;
marking the baseline parameters at the corresponding positions of the independent time axis of the specified area according to the occurrence time of the baseline parameters;
and simultaneously outputting the fetal heart rate curve and the labeled baseline parameters.
Another object of an embodiment of the present invention is to provide an output device for a fetal heart rate curve, including:
the generating unit is used for generating a fetal heart rate curve according to the original signals collected by the fetal heart monitoring equipment;
the extraction unit is used for extracting the fetal heart rate curve in a specified time period;
a measurement unit for measuring a baseline parameter of the fetal heart rate curve for the specified time period;
and the output unit is used for simultaneously outputting the fetal heart rate curve and the measured baseline parameters.
Optionally, the measurement unit is further configured to:
generating a line segment A parallel to a time axis and having an ordinate of the baseline fetal heart rate value within the specified time period of the fetal heart rate curve.
Optionally, the baseline parameter comprises a baseline variability cycle of fetal heart rate, and the measurement unit comprises:
the first extraction subunit is used for extracting an intersection point of the line segment A and the fetal heart rate curve of the specified time period;
the first cutting subunit is used for cutting the fetal heart rate curve in the specified time period according to a preset time length;
the first calculating subunit is used for respectively calculating the number of the intersection points in each preset time length;
and the first measuring subunit is used for dividing the calculated number of all the intersection points by 2 and then averaging the number of the intersection points to obtain the fetal heart rate baseline variation cycle of the fetal heart rate curve in the specified time period.
Optionally, the baseline parameter comprises a value of a baseline variation in fetal heart rate, and the measurement unit comprises:
the second cutting subunit is used for cutting the fetal heart rate curve in the specified time period according to a preset time length;
the second calculating subunit is used for respectively calculating the difference value between the maximum value and the minimum value of the fetal heart rate in each preset time length;
and the second measuring subunit is used for averaging all the calculated difference values to obtain the fetal heart rate baseline variation amplitude value of the fetal heart rate curve in the specified time period.
Optionally, the baseline parameters further comprise a sinusoidal trend marker, the measurement unit comprising:
a third calculating subunit, configured to calculate, based on a least square method, a sum of errors between the fetal heart rate curve and a sinusoidal equation in the specified time period, where V is the amplitude of the fetal heart rate baseline variation, C is the period of the fetal heart rate baseline variation, and H is the value H of the fetal heart rate baseline;
the judging subunit is used for judging whether the error sum is within a preset threshold value range;
the third measuring subunit is used for generating a mark that the fetal heart rate curve is in a sine trend if the error sum is within a preset threshold range; and if the error sum is not within the preset threshold value range, generating a mark that the fetal heart rate curve does not show a sine trend.
Optionally, the output unit includes:
a time axis generating subunit, configured to generate an independent time axis in a designated area, where the time axis corresponds to a time axis of the fetal heart rate curve one-to-one in time, and the designated area includes a blank area between the fetal heart rate curve and the uterine contraction strength curve;
a marking subunit, configured to mark the baseline parameter at a position corresponding to the independent time axis in the designated area according to the occurrence time of the baseline parameter;
and the output subunit is used for simultaneously outputting the fetal heart rate curve and the labeled baseline parameters.
The embodiment of the invention can automatically measure the baseline parameters in the fetal heart rate curve and mark the baseline parameters in the fetal heart rate curve graph according to the measurement result, so that the output fetal heart rate curve can intuitively and accurately display various parameters of the fetal heart rate baseline, the fetal heart rate baseline analysis can be conveniently carried out by medical personnel according to the output fetal heart rate curve, and the accuracy of the fetal heart rate baseline analysis is improved.
Drawings
FIG. 1 is a flow chart of an implementation of a method for outputting a fetal heart rate curve according to an embodiment of the present invention;
fig. 2 is a flowchart of an implementation of the method S102 for outputting a fetal heart rate curve according to an embodiment of the present invention;
fig. 3 is a flowchart of an implementation of the method S103 for outputting a fetal heart rate curve according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating an implementation of the method S103 for outputting a fetal heart rate curve according to another embodiment of the present invention;
fig. 5 is a flowchart illustrating an implementation of the method S103 for outputting a fetal heart rate curve according to another embodiment of the present invention;
fig. 6 is a flowchart illustrating an implementation of the method S103 for outputting a fetal heart rate curve according to another embodiment of the present invention;
fig. 7 is a flowchart illustrating an implementation of the method S103 for outputting a fetal heart rate curve according to another embodiment of the present invention;
FIG. 8 is a schematic diagram of the fetal heart rate curve output of the method for outputting a fetal heart rate curve according to the embodiment of the invention;
fig. 9 is a block diagram of an output device for a fetal heart rate curve according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows an implementation flow of the method for outputting a fetal heart rate curve provided by the embodiment of the invention, which is detailed as follows:
in S101, a fetal heart rate curve is generated according to the raw signals collected by the fetal heart monitoring device.
The fetal heart rate monitoring device is started, the acquisition of original signals can be completed through the probe, the acquired original signals are converted into fetal heart rate data and are placed in a specified cache region, a background program of the fetal heart rate monitoring device generates and displays a fetal heart rate curve according to the data stored in the cache region, and the generated CTG curve takes time as a horizontal coordinate and the fetal heart rate as a vertical coordinate.
In S102, the fetal heart rate curve for a specified time period is extracted.
In this embodiment, the fetal heart rate curve of the specified time period may be a fetal heart rate curve currently displayed on a screen of the fetal heart monitoring device, or may also be a fetal heart rate curve within a time period selected by a user through inputting a selection instruction in the fetal heart rate curve, specifically, a selection instruction input by the user is received, the time period selected by the selection instruction in the fetal heart rate curve is detected, and then the fetal heart rate curve of the selected time period is extracted from the fetal heart rate curve.
As shown in fig. 2, as an embodiment of the present invention, the receiving a selection instruction input by a user, and the detecting a time period selected by the selection instruction in the fetal heart rate curve includes:
in S201, a start point selection instruction input by a user is received, and a first input position of the start point selection instruction in the fetal heart rate curve is detected.
In S202, an endpoint selection instruction input by a user is received, and a second input position of the endpoint selection instruction in the fetal heart rate curve is detected.
In this embodiment, a start point selection button and an end point selection button may be generated on an operation interface of the fetal heart rate monitoring device, after the start point selection button is triggered, a click operation is performed at any position in a fetal heart rate graph, and when the start point selection is completed, the position is the first input position; and after the end point selection button is triggered, clicking any position in the fetal heart rate curve graph to finish end point selection, wherein the position is a second input position.
In S203, two separators are generated at the first input position and the second input position of the fetal heart rate curve, respectively.
In S204, the time period selected in the fetal heart rate curve is determined based on the two separators.
The separator may be a line segment, or may be another form of separation mark. Taking a line segment as an example, after the selection of the starting point and the end point is completed, the system background automatically generates two line segments which are perpendicular to and intersect with the time axis on the first input position and the second input position respectively, and then the two intersection points of the line segment and the time axis are the time starting point and the time end point of the time period selected by the user respectively, so that the selection of the time period is completed.
In the process of selecting the starting point and the end point, whether a corresponding selection instruction is received within a preset time length can be judged, if yes, S203 is executed, and if not, the input of the selection instruction is continuously waited.
As another embodiment of the present invention, the receiving a selection instruction input by a user, and detecting a time period selected by the selection instruction in the fetal heart rate curve may be further implemented by: after receiving two selection instructions input by a user, respectively detecting input positions of the two selection instructions in a fetal heart rate curve, respectively generating two line segments perpendicular to a time axis at the two detected input positions, and taking a line segment between two intersection points as the time period selected in the fetal heart rate curve. In contrast to the embodiment shown in fig. 2, the present embodiment does not need to particularly determine the start point and the end point when the selection instruction input is performed, and directly takes the time period between two input positions as the selected time period. Furthermore, if a third or even further selection instruction is received, these selection instructions may be refused to be responded to, or the time period selected in the fetal heart rate curve may be determined otherwise according to a preset manner, such as according to the last two selection instructions, or according to the first selection instruction and the last selection instruction, and so on.
The embodiment can accurately and quickly complete the selection of the time period, and the generated line segment can also directly pass through the fetal heart rate curve to complete the data interception of the fetal heart rate curve, so that the fetal heart rate curve corresponding to the selected time period is extracted.
In S103, a baseline parameter of the fetal heart rate curve for the specified time period is measured.
Wherein the baseline parameter includes a fetal heart rate baseline value, then S103 further includes:
generating a line segment A parallel to a time axis and having an ordinate of the baseline fetal heart rate value within the specified time period of the fetal heart rate curve.
The segment a represents the fetal heart rate baseline of the fetal heart rate curve.
Considering that there may be a deviation in the calculation of the baseline fetal heart rate value, as an embodiment of the present invention, the segment a may be further configured as a segment group capable of moving in a direction parallel to the time axis within the range of the maximum fetal heart rate value and the minimum fetal heart rate value of the specified time period, and in the moving state, when the cursor is moved onto the segment a, the cursor may be converted into a hand-type tool to prompt the user that the segment a may be moved at this time so as to position the segment a at the most appropriate baseline position according to the experience of the user. And in the moving process of the line segment A, the background recalculates the related baseline parameters and updates the baseline parameters identified on the fetal heart rate curve graph.
As an embodiment of the invention, the measurement of the baseline value of the fetal heart rate is completed by adopting a mean filtering mode. As shown in fig. 3, S103 specifically is:
in S301, all fetal heart rate values of the fetal heart rate curve for the specified time period are read.
In S302, the read fetal heart rate values are averaged to obtain a fetal heart rate baseline value of the fetal heart rate curve in the specified time period.
This embodiment obtains the fetal heart rate base line value of this part of fetal heart rate curve through direct fetal heart rate curve averaging to the specified portion, and whole acquisition process is high-efficient, and can measure the fetal heart rate base line value of this part of fetal heart rate curve comparatively accurately.
As another embodiment of the present invention, as shown in fig. 4, the method for acquiring the fetal heart rate baseline value in S103 specifically includes:
in S401, the fetal heart rate curve of the designated time period is input into a low-pass filter, and a low-frequency signal is output through the low-pass filter.
In this embodiment, a low-pass filter is set in advance, the fetal heart rate curve of the specified time period is input into the low-pass filter, a signal lower than the cut-off frequency of the low-pass filter in the fetal heart rate curve is output by the low-pass filter, and a signal higher than the cut-off frequency of the low-pass filter in the fetal heart rate curve cannot be output by the low-pass filter, so that the fetal heart rate curve is converted into a low-frequency signal for output through the processing of the low-pass filter.
In S402, searching the data H with the largest frequency of occurrence in the low-frequency signal1And detecting at said H1Total number P of data in U unit range of value of (1)1。
Traversing each data in the low-frequency signal, and finding out the data H with the maximum frequency1Thereafter, with H1Based on the value of (2), determining the total number P of data in the U unit ranges of the value1. For example, if the fetal heart rate value with the highest frequency of occurrence is 145bpm, the total number of data in the 10 unit range of the value is determined, that is, the total number of data in the range of 135bpm to 155bpm is counted.
In S403, the P is judged1Whether it is greater than a preset threshold value Pc。
In S404, if the P1Greater than a predetermined threshold value PcFor the H1And said P1And averaging the data to obtain a fetal heart rate baseline value of the fetal heart rate curve in the specified time period.
In this case, the fetal heart rate profile for the specified time period is considered to contain data sufficient to support accurate acquisition of a fetal heart rate baseline.
In S405, if the P1Is not greater than the preset threshold value PcThe measurement operation of the baseline fetal heart rate value is terminated.
In this case, it is considered that the fetal heart rate curve for the given time period does not contain enough data to support accurate acquisition of the fetal heart rate baseline, and therefore acquisition of the fetal heart rate baseline value for the segment of the fetal heart rate curve is stopped.
Compared with the embodiment shown in fig. 3, the embodiment can ensure the accuracy of the acquired fetal heart rate baseline value, and is more beneficial to the follow-up accurate analysis of the fetal heart rate baseline.
As an embodiment of the present invention, in S103, the baseline parameter may further include a value of a baseline variation of fetal heart rate, and the measurement method for the parameter is as shown in fig. 5:
in S501, the fetal heart rate curve of the designated time period is cut according to a predetermined time length.
In S502, the difference between the maximum value and the minimum value of the fetal heart rate in each of the predetermined time periods is calculated respectively.
In S503, averaging all the calculated differences to obtain the fetal heart rate baseline variation amplitude value of the fetal heart rate curve in the specified time period.
As an embodiment of the present invention, in S103, the baseline parameter may further include a baseline variation cycle of the fetal heart rate, and the measurement method of the parameter is as shown in fig. 6:
in S601, an intersection of the line segment a and the fetal heart rate curve of the specified time period is extracted.
In S602, the fetal heart rate curve of the designated time period is cut according to a predetermined time length.
In S603, the number of the intersections in each of the predetermined time periods is calculated, respectively.
In S604, the calculated number of all the intersection points is divided by 2, and then an average value is obtained, so as to obtain the fetal heart rate baseline variation cycle of the fetal heart rate curve in the specified time period.
As an embodiment of the present invention, in S103, the baseline parameter may further include a sinusoidal trend mark, and the measurement method for the parameter is as shown in fig. 7:
in S701, based on a least square method, calculating the fetal heart rate curve and a sinusoidal equation of the specified time periodWherein V is the fetal heart rate baseline variation amplitude, C is the fetal heart rate baseline variation cycle, and H is the fetal heart rate baseline value H.
In S702, it is determined whether the error sum is within a preset threshold range.
In S703, if the error sum is within a preset threshold range, a mark that the fetal heart rate curve is in a sinusoidal trend is generated.
In S704, if the error sum is not within a preset threshold range, generating a mark that the fetal heart rate curve does not have a sinusoidal trend.
In the present embodiment, the sinusoidal trend mark may be presented by means of letters, characters, or the like. For example, the symbol "1" represents a mark in which the fetal heart rate curve is in a sinusoidal trend, and the symbol "0" represents a mark in which the fetal heart rate curve is not in a sinusoidal trend; for another example, the term "yes" is used to indicate that the fetal heart rate curve is in a sinusoidal trend, and the term "no" is used to indicate that the fetal heart rate curve is not in a sinusoidal trend.
The method for measuring the baseline parameters in the embodiments of fig. 3 to 7 can also be implemented by using techniques known in the art, for example, the fetal heart rate baseline data can be directly compared with the fetal heart rate curve data at the corresponding time to determine whether the fetal heart rate curve is sinusoidal.
In S104, the fetal heart rate curve and the measured baseline parameter are output simultaneously.
In this embodiment, the output result includes both the fetal heart rate curve and the baseline parameter measured in S103, and fig. 8 shows a schematic output diagram of the fetal heart rate curve provided by the embodiment of the present invention. In fig. 8, the upper curve is a fetal heart rate curve in the CTG curve, the lower curve is a uterine contraction strength curve in the CTG curve, a fetal heart rate baseline is marked by a line segment a, meanwhile, a baseline parameter is marked at a corresponding position of the independent time axis in a space region P below the segment of the fetal heart rate curve (between the fetal heart rate curve and the uterine contraction strength curve), the time axis corresponds to the time axis of the fetal heart rate curve one by one in time, a display region of the time axis supports on-screen display or simultaneous printing with the fetal heart rate curve, parameter display is performed in a blank region P based on the time axis, the parameter display region is located in a specified time period and is suitable for not covering the fetal heart rate curve, the display of data of the fetal heart rate and fetal heart rate curve is prevented from being influenced, and finally, the fetal heart rate curve and the marked baseline parameter are output simultaneously. It can be seen that in the blank region P shown in fig. 8, the fetal heart rate baseline value, the amplitude of the fetal heart rate baseline variation, the period of the fetal heart rate baseline variation, and the sinusoidal trend mark are displayed.
The output mode of S104 includes but is not limited to at least one of the following:
1. outputting the fetal heart rate curve and the measured baseline parameters to a storage device for storage;
2. outputting the fetal heart rate curve and the measured baseline parameters to a display device for displaying;
3. and outputting the fetal heart rate curve and the measured baseline parameters to a printing device for printing.
From this one, medical staff can conveniently look over the fetal heart rate curve that has passed through the sign in display device, perhaps look over the fetal heart rate curve that has passed through the sign that has been printed out by printing device, and the fetal heart rate curve that has passed through the sign can be stored well in storage device, shows output or printout when being convenient for follow-up needs.
Meanwhile, if the baseline parameters are displayed in the blank area between the fetal heart rate curve and the uterine contraction strength curve, the following technical effects can be produced: since the uterine contraction directly reflects the degree of fetal compression and is related to the fetal oxygen supply condition, if continuous high-strength uterine contraction occurs in the labor process, insufficient oxygen supply of the fetus in a short time can be caused, further, the fetal central nervous system adjusts the fetal heart rate to adapt to environmental changes, and the change of the fetal heart rate can be finally reflected on the fetal heart rate baseline and the variation value thereof, so that a clinical doctor needs to judge the reason of the change of the fetal heart rate baseline and the variation value thereof by combining the uterine contraction condition. Therefore, the baseline parameters are displayed in a blank area between the fetal heart rate curve and the uterine contraction strength curve, so that the information related to the fetal heart rate curve and the information related to the uterine contraction curve can be connected in series, and a diagnosis result can be conveniently obtained.
The embodiment of the invention can automatically measure the baseline parameters in the fetal heart rate curve, including measuring the fetal heart rate baseline value, the fetal heart rate baseline variation amplitude, the fetal heart rate baseline variation cycle, whether the fetal heart rate curve is in a sine trend and the like, and marks the baseline parameters in the fetal heart rate curve graph according to the measurement result, so that the output fetal heart rate curve can intuitively and accurately display various parameters of the fetal heart rate baseline, the fetal heart rate baseline analysis can be conveniently carried out by medical personnel according to the output fetal heart rate curve, the accuracy of the fetal heart rate baseline analysis is improved, and the probability of misdiagnosis is reduced.
Fig. 9 is a block diagram of an output device for fetal heart rate curves according to an embodiment of the present invention, which can be located in a fetal heart rate monitoring apparatus, for executing the output method for fetal heart rate curves according to the above embodiment. For convenience of explanation, only the portions related to the present embodiment are shown.
Referring to fig. 9, the apparatus includes:
the generating unit 91 generates a fetal heart rate curve according to the original signal collected by the fetal heart monitoring device.
The extracting unit 92 extracts the fetal heart rate curve of a specified time period.
A measuring unit 93 for measuring a baseline parameter of the fetal heart rate curve for the specified time period.
And an output unit 94 for outputting the fetal heart rate curve and the measured baseline parameters.
Optionally, the measurement unit 93 is further configured to:
generating a line segment A parallel to a time axis and having an ordinate of the baseline fetal heart rate value within the specified time period of the fetal heart rate curve.
Optionally, the baseline parameters include a baseline variability cycle of fetal heart rate, and the measurement unit 93 includes:
the first extraction subunit is used for extracting an intersection point of the line segment A and the fetal heart rate curve of the specified time period;
the first cutting subunit is used for cutting the fetal heart rate curve in the specified time period according to a preset time length;
the first calculating subunit is used for respectively calculating the number of the intersection points in each preset time length;
and the first measuring subunit is used for dividing the calculated number of all the intersection points by 2 and then averaging the number of the intersection points to obtain the fetal heart rate baseline variation cycle of the fetal heart rate curve in the specified time period.
Optionally, the baseline parameters include a fetal heart rate baseline variation cycle, the baseline parameters further include a fetal heart rate baseline variation amplitude value, and the measurement unit 93 includes:
the second cutting subunit is used for cutting the fetal heart rate curve in the specified time period according to a preset time length;
the second calculating subunit is used for respectively calculating the difference value between the maximum value and the minimum value of the fetal heart rate in each preset time length;
and the second measuring subunit is used for averaging all the calculated difference values to obtain the fetal heart rate baseline variation amplitude value of the fetal heart rate curve in the specified time period.
Optionally, the baseline parameters further comprise a sinusoidal trend flag, and the measurement unit 93 comprises:
and the third calculation subunit calculates the sum of errors between the fetal heart rate curve and the sinusoidal equation in the specified time period based on a least square method, wherein V is the amplitude of the fetal heart rate baseline variation, C is the period of the fetal heart rate baseline variation, and H is the value H of the fetal heart rate baseline.
And the first judgment subunit judges whether the error sum is within a preset threshold value range.
The third measurement subunit generates a mark that the fetal heart rate curve is in a sine trend if the error sum is within a preset threshold range; and if the error sum is not within the preset threshold value range, generating a mark that the fetal heart rate curve does not show a sine trend.
Optionally, the baseline parameter comprises a fetal heart rate baseline value, and the measurement unit 93 comprises:
and the reading subunit reads all the fetal heart rate numerical values of the fetal heart rate curve in the specified time period.
And the fourth measuring subunit is used for averaging the read fetal heart rate numerical values to obtain a fetal heart rate baseline value of the fetal heart rate curve in the specified time period.
Optionally, the baseline parameter comprises a fetal heart rate baseline value, and the measurement unit 93 comprises:
and the input subunit inputs the fetal heart rate curve of the specified time period into a low-pass filter, and outputs a low-frequency signal through the low-pass filter.
And the detection subunit is used for searching the data H1 with the maximum occurrence frequency in the low-frequency signal and detecting the total number P1 of the data in the U unit range of the numerical value of H1.
And the second judging subunit judges whether the P1 is greater than a preset threshold value Pc.
And a fifth measuring subunit, if the P1 is greater than a preset threshold value Pc, averaging the H1 and the P1 data to obtain a fetal heart rate baseline value of the fetal heart rate curve in the specified time period.
And a terminator unit for terminating the measurement operation of the fetal heart rate baseline value if the P1 is not greater than the preset threshold value Pc.
Optionally, the output unit 94 is specifically configured to:
outputting the fetal heart rate curve and the measured baseline parameters to a storage device for storage; or,
outputting the fetal heart rate curve and the measured baseline parameters to a display device for displaying; or,
and outputting the fetal heart rate curve and the measured baseline parameters to a printing device for printing.
Optionally, the extracting unit 92 is specifically configured to:
and extracting a fetal heart rate curve currently displayed on the fetal heart rate monitoring equipment screen.
Optionally, the extracting unit 92 includes:
and the receiving subunit receives a selection instruction input by a user and detects a time period selected by the selection instruction in the fetal heart rate curve.
And the second extraction subunit extracts the fetal heart rate curve of the selected time period from the fetal heart rate curves.
Optionally, the output unit 94 includes:
a time axis generating subunit, configured to generate an independent time axis in a designated area, where the time axis corresponds to a time axis of the fetal heart rate curve one-to-one in time, and the designated area includes a blank area between the fetal heart rate curve and the uterine contraction strength curve;
a marking subunit, configured to mark the baseline parameter at a position corresponding to the independent time axis in the designated area according to the occurrence time of the baseline parameter;
and the output subunit is used for simultaneously outputting the fetal heart rate curve and the labeled baseline parameters.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (12)
1. A method for outputting a fetal heart rate curve, comprising:
generating a fetal heart rate curve according to an original signal acquired by fetal heart monitoring equipment;
extracting the fetal heart rate curve in a specified time period;
measuring a baseline parameter of the fetal heart rate curve for the specified time period;
and simultaneously outputting the fetal heart rate curve and the measured baseline parameters.
2. The method of claim 1, wherein said measuring a baseline parameter of said fetal heart rate curve for said specified period of time further comprises:
generating a line segment A parallel to a time axis and having a ordinate of a fetal heart rate baseline value within the specified time period of the fetal heart rate curve.
3. The method of claim 2, wherein the baseline parameters comprise a fetal heart rate baseline variability cycle, and wherein measuring the baseline parameters of the fetal heart rate profile for the specified time period comprises:
extracting an intersection point of the line segment A and the fetal heart rate curve of the specified time period;
cutting the fetal heart rate curve of the specified time period according to a preset time length;
respectively calculating the number of the intersection points in each preset time length;
and dividing the number of all the calculated intersection points by 2, and then averaging to obtain the fetal heart rate baseline variation cycle of the fetal heart rate curve in the specified time period.
4. The method of claim 1, wherein the baseline parameter comprises a fetal heart rate baseline variation amplitude value, and wherein measuring the baseline parameter of the fetal heart rate curve for the specified time period comprises:
cutting the fetal heart rate curve of the specified time period according to a preset time length;
respectively calculating the difference value between the maximum value and the minimum value of the fetal heart rate in each preset time period;
and averaging all the calculated difference values to obtain the fetal heart rate baseline variation amplitude value of the fetal heart rate curve in the specified time period.
5. A method according to claim 3 or 4, wherein the baseline parameters further comprise sinusoidal trend markers, and wherein said measuring the baseline parameters of the fetal heart rate curve for the specified time period comprises:
calculating the fetal heart rate curve and the sinusoidal equation of the specified time period based on a least square methodWherein V is the fetal heart rate baseline variation amplitude, C is the fetal heart rate baseline variation cycle, and H is the fetal heart rate baseline value H;
judging whether the error sum is within a preset threshold range;
if the error sum is within a preset threshold value range, generating a mark that the fetal heart rate curve is in a sine trend;
and if the error sum is not within the preset threshold value range, generating a mark that the fetal heart rate curve does not show a sine trend.
6. A method according to any of claims 1 to 5, wherein said simultaneously outputting said fetal heart rate curve and said measured baseline parameter comprises:
generating an independent time axis in a designated area, wherein the time axis corresponds to the time axis of the fetal heart rate curve one by one in time, and the designated area comprises a blank area between the fetal heart rate curve and the uterine contraction strength curve;
marking the baseline parameters at the corresponding positions of the independent time axis of the specified area according to the occurrence time of the baseline parameters;
and simultaneously outputting the fetal heart rate curve and the labeled baseline parameters.
7. An output device for a fetal heart rate curve, comprising:
the generating unit is used for generating a fetal heart rate curve according to the original signals collected by the fetal heart monitoring equipment;
the extraction unit is used for extracting the fetal heart rate curve in a specified time period;
a measurement unit for measuring a baseline parameter of the fetal heart rate curve for the specified time period;
and the output unit is used for simultaneously outputting the fetal heart rate curve and the measured baseline parameters.
8. The apparatus of claim 7, wherein the measurement unit is further to:
generating a line segment A parallel to a time axis and having an ordinate of the baseline fetal heart rate value within the specified time period of the fetal heart rate curve.
9. The apparatus of claim 8, wherein the baseline parameter comprises a baseline variability cycle of fetal heart rate, and the measurement unit comprises:
the first extraction subunit is used for extracting an intersection point of the line segment A and the fetal heart rate curve of the specified time period;
the first cutting subunit is used for cutting the fetal heart rate curve in the specified time period according to a preset time length;
the first calculating subunit is used for respectively calculating the number of the intersection points in each preset time length;
and the first measuring subunit is used for dividing the calculated number of all the intersection points by 2 and then averaging the number of the intersection points to obtain the fetal heart rate baseline variation cycle of the fetal heart rate curve in the specified time period.
10. The apparatus of claim 7, wherein the baseline parameter comprises a fetal heart rate baseline variation amplitude value, and the measurement unit comprises:
the second cutting subunit is used for cutting the fetal heart rate curve in the specified time period according to a preset time length;
the second calculating subunit is used for respectively calculating the difference value between the maximum value and the minimum value of the fetal heart rate in each preset time length;
and the second measuring subunit is used for averaging all the calculated difference values to obtain the fetal heart rate baseline variation amplitude value of the fetal heart rate curve in the specified time period.
11. The apparatus of claim 9 or 10, wherein the baseline parameters further comprise a sinusoidal trend marker, the measurement unit comprising:
a third calculating subunit, configured to calculate, based on a least square method, a sum of errors between the fetal heart rate curve and a sinusoidal equation in the specified time period, where V is the amplitude of the fetal heart rate baseline variation, C is the period of the fetal heart rate baseline variation, and H is the value H of the fetal heart rate baseline;
the judging subunit is used for judging whether the error sum is within a preset threshold value range;
the third measuring subunit is used for generating a mark that the fetal heart rate curve is in a sine trend if the error sum is within a preset threshold range; and if the error sum is not within the preset threshold value range, generating a mark that the fetal heart rate curve does not show a sine trend.
12. The apparatus of any one of claims 7 to 11, wherein the output unit comprises:
a time axis generating subunit, configured to generate an independent time axis in a designated area, where the time axis corresponds to a time axis of the fetal heart rate curve one-to-one in time, and the designated area includes a blank area between the fetal heart rate curve and the uterine contraction strength curve;
a marking subunit, configured to mark the baseline parameter at a position corresponding to the independent time axis in the designated area according to the occurrence time of the baseline parameter;
and the output subunit is used for simultaneously outputting the fetal heart rate curve and the labeled baseline parameters.
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