wSmartHeart® ECG Technology
wSmartHeart® intelligent ECG detection technology integrates ECG signal quality detection technology, intelligent switching analysis lead technology, ECG signal abnormal fast recovery technology, tall T wave recognition, and interference elimination technology to ensure the accuracy of heart rate calculation and arrhythmia analysis. Even under interference, the accuracy of identification can still be guaranteed.
Since the wSmartHeart® release, it has been tested by international authoritative databases MIT, AHA, CSE, NST and other databases. It can adapt well to different clinical application scenarios, including emergency and critical care, routine monitoring, and veterinary monitoring.
wSmartHeart® ECG Technology一International authoritative database test
The evaluation of the pros and cons of ECG technology mainly depends on the accuracy and reliability of ECG recognition. At present, the first-line manufacturers are all through the establishment of database verification and through the detection of international authoritative databases to prove the accuracy of algorithm recognition.
Witleaf has been tested by various international authoritative databases such as MIT, AHA, CSE, NST, etc., and the detection accuracy has reached the first-line level.
Test method
According to the standard requirements of ANSI/AAMI EC57: 2012 Testing and reporting performance results of cardiac rhythm and ST segment measurement algorithms, this is the gold standard for ECG algorithm detection, including the detection requirements of various international authoritative databases, heart rate and arrhythmia algorithms must pass Approved by FDA, it must pass the test of EC57 standard.Therefore, the accuracy of the EC57 standard detection is also an evaluation index for the performance of the algorithm. The EC57 standard is mainly aimed at the detection of ECG QRS waves and ventricular premature beats. The main database is MIT and the detection of the AHA ECG database. The comparison between our test results and those of some other first-line manufacturers below shows that our test accuracy can reach the first-line level.
Test result
QRS Se: QRS Complex Sensitivity
QRS +P: QRS Complex Positive Predictivity
V Se: VEB Complex Sensitivity
V+P: VEB Complex Positive Predictivity
V FPR: PVC False Positive Rate
QRS Se, QRS +P, V Se, V+P, and V FPR represent the accuracy of ECG waveform recognition and arrhythmia judgment. According to the test results of the leading manufacturer of electrical monitoring, wSmartHeart® ECG technology has a high recognition accuracy.
QRS +P: QRS Complex Positive Predictivity
V Se: VEB Complex Sensitivity
V+P: VEB Complex Positive Predictivity
V FPR: PVC False Positive Rate
QRS Se, QRS +P, V Se, V+P, and V FPR represent the accuracy of ECG waveform recognition and arrhythmia judgment. According to the test results of the leading manufacturer of electrical monitoring, wSmartHeart® ECG technology has a high recognition accuracy.
Clinical benefits
Through the test results, we can see that the sensitivity of our QRS wave detection reaches 99.7%, and the positive predictive rate reaches more than 99.5%. The correctness of QRS wave detection also ensures the correctness of heart rate calculation.
The detection sensitivity of ventricular premature beats reaches over 93%, and the positive predictive rate reaches over 96%. The detection accuracy fully guarantees the accuracy of wSmartHeart® in the clinical application of ECG recognition, reaching the level of first-tier manufacturers.
wSmartHeart® ECG rapid recovery technology
In clinical practice, abnormal situations such as channel signal overload, baseline drift, and lead drop are often encountered. At this time, after doctors and nurses intervene, it still takes a while for the signal to recover.
However, wSmartHeart® ECG technology combines hardware system and software filtering for synchronous processing. , can quickly recover within 3S after the clinical waveform drifts, ensuring the reliability of clinical monitoring.
Implementation plan
Under abnormal clinical conditions such as lead and overload, the system detects signal overload or baseline drift, immediately performs hardware discharge processing, and performs lead switching to ensure that the overload voltage will not continue to be loaded, and switch the high-pass filter frequency to ensure system recovery time Less than 3S, combined with software filtering and hardware channel switching to ensure that the overload signal will not impact the rear stage, and ensure the rapid recovery of the ECG, which is stable and reliable. As shown in the figure below, it is a schematic diagram of rapid recovery after the lead is disconnected when the lead is connected.
Clinical benefits
Ensure that the ECG can quickly return to the normal monitoring state when it is connected to the electrocardiogram under abnormal conditions such as overload, drift, and lead-off, wSmartHeart® can reduce the clinical impact on patients and improve the reliability of monitoring.
wSmartHeart® Intelligent optimal analysis lead technology
The intelligent optimal analysis lead technology is an important part of wSmartHeart® ECG technology, which can ensure the system is disturbed under certain circumstances and still ensure the reliability of monitoring reliability.
Implementation plan
At present, wSmartHeart® technology can algorithmically optimize the indicators mainly including lead-off indicators, signal overload, signal noise and other indicators. According to the indicators of each channel, it can comprehensively decide which channel to choose for analysis.
When some leads are disturbed, it can quickly carry out intelligent Switch calculation channels to avoid false alarms caused by interference. wSmartHeart® can ensure the reliability of heart rate and arrhythmia results when some leads are interfered or fall off.
Clinical benefits
As shown in the figure 4 below, lead I is severely disturbed. If it is a single-lead analysis, normal results cannot be obtained, and the alarm noise is too large. However, the intelligent lead optimization technology can automatically identify that the noise of lead I is too large, so that Select the appropriate leads that can also be analyzed, and calculate the normal results without false alarms.
wSmartHeart® Intelligent lead optimization technology can greatly reduce false alarms of ECG, and can still ensure normal ECG monitoring even when some leads are disturbed.
wSmartHeart® Intelligent lead optimization technology can greatly reduce false alarms of ECG, and can still ensure normal ECG monitoring even when some leads are disturbed.
wSmartHeart® Strong anti-interference ability
wSmartHeart® ECG technology has good anti-interference ability, through the suppression of PACE overshoot, tall T wave suppression, multiple template matching technology, etc.,
it can identify more accurately and effectively reduce false alarms caused by wrong identification, is a necessary link to ensure the reliability of system monitoring.
Implementation plan
1) PACE pulse suppression
Some patients wearing a pacemaker will generate a large PACE overshoot signal, which has the hardware PACE pulse suppression function. As shown in the figure below, the PACE pulse has a large overshoot, and its amplitude reaches the QRS wave amplitude, which seriously affects the reliability of heart rate calculation. Using the hardware PACE pulse filter, the PACE pulse signal can be effectively removed, so that the suppressed ECG waveform is a normal QRS wave waveform, wSmartHeart® ECG technology can be effectively recognized, while the ECG waveform without PACE suppression function will lead to misidentification and false alarms. (figure 5)
Some patients wearing a pacemaker will generate a large PACE overshoot signal, which has the hardware PACE pulse suppression function. As shown in the figure below, the PACE pulse has a large overshoot, and its amplitude reaches the QRS wave amplitude, which seriously affects the reliability of heart rate calculation. Using the hardware PACE pulse filter, the PACE pulse signal can be effectively removed, so that the suppressed ECG waveform is a normal QRS wave waveform, wSmartHeart® ECG technology can be effectively recognized, while the ECG waveform without PACE suppression function will lead to misidentification and false alarms. (figure 5)
2）High T wave suppression ability
Tall T waves are a common type for arrhythmia patients, and wSmartHeart® ECG technology has a good ability to suppress tall T waves. As shown in the figure below, the T wave amplitude is greater than the R wave amplitude. The wSmartHeart® ECG technology can filter out tall T waves through the RR refractory period and the T wave shape recognition algorithm, effectively ensuring the reliability of clinical heart rate calculation. (figure 6)
Tall T waves are a common type for arrhythmia patients, and wSmartHeart® ECG technology has a good ability to suppress tall T waves. As shown in the figure below, the T wave amplitude is greater than the R wave amplitude. The wSmartHeart® ECG technology can filter out tall T waves through the RR refractory period and the T wave shape recognition algorithm, effectively ensuring the reliability of clinical heart rate calculation. (figure 6)
3） Multi-scale template matching technology
wSmartHeart® ECG technology uses multiple parameters of morphological category, QRS wave width and RR interval for template matching, which can effectively identify arrhythmia compared with template matching and identification only through morphological category. As shown in the figure below, QRS wave classification can be performed through multi-scale template matching, which can more accurately identify arrhythmia. (figure 7)
wSmartHeart® ECG technology uses multiple parameters of morphological category, QRS wave width and RR interval for template matching, which can effectively identify arrhythmia compared with template matching and identification only through morphological category. As shown in the figure below, QRS wave classification can be performed through multi-scale template matching, which can more accurately identify arrhythmia. (figure 7)
Clinical benefits
The anti-interference ability of wSmartHeart® ECG technology can better solve the interference situation in actual clinical practice. According to clinical feedback, 23% of the alarms were caused by the wrong recognition of the conventional ECG technology, but only 3% of the alarms were caused by the wrong recognition of the wSmartHeart® ECG technology. The alarm rate can be reduced by more than 20%.
(figure 8)
(figure 8)
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