Correlation of blood pressure and the ratio of S1 to S2 as measuredby esophageal stethoscope and wireless bluetooth transmission

Lim, Kyoung Hoon; Shin, Young Duck; Park, Sang Hi; Bae, Jin Ho; Lee, Hong Jae; Kim, Seon Jung; Shin, Jong-Il; Choi, Young Jin

doi:10.12669/pjms.294.3639

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…Ozcan Gulcur and Bahadirlar (1998) conducted experiments invasively for obtaining the systolic blood pressures at the aortic roots of human subjects and then found that the amplitude of the second HS has a positive linear relationship to the aortic pressure. Hoon Lim et al (2013) found that the ratio of S1 to S2 has a greater correlation with the systolic blood pressure than the amplitude of S1 or S2. A different study (Hsieh et al 2010) described the ratio of primary HSs as being more useful in calculating blood pressure.…”

Section: Introductionmentioning

confidence: 99%

“…(3) The variations in blood pressure in the previous studies are usually small. They are normally induced by physical excitement, with systolic blood pressure (SBP) figures of 80-150 mmHg in a human experiment performed by Hoon Lim et al (2013), 119-152 mmHg induced by stair climbing in a study performed by Zhang and Zhang (2006), 90-140 mmHg induced by cold pressure in a study by Peng et al (2015), and 90-150 mmHg induced by physical exercise in a study by Wong et al (2006aWong et al ( , 2006b.…”

Section: Introductionmentioning

confidence: 99%

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A non-invasive approach to investigation of ventricular blood pressure using cardiac sound features

et al. 2017

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Heart sounds (HSs) are produced by the interaction of the heart valves, great vessels, and heart wall with blood flow. Previous researchers have demonstrated that blood pressure can be predicted by exploring the features of cardiac sounds. These features include the amplitude of the HSs, the ratio of the amplitude, the systolic time interval, and the spectrum of the HSs. A single feature or combinations of several features have been used for prediction of blood pressure with moderate accuracy. Experiments were conducted with three beagles under various levels of blood pressure induced by different doses of epinephrine. The HSs, blood pressure in the left ventricle and electrocardiograph signals were simultaneously recorded. A total of 31 records (18 262 cardiac beats) were collected. In this paper, 91 features in various domains are extracted and their linear correlations with the measured blood pressures are examined. These features are divided into four groups and applied individually at the input of a neural network to predict the left ventricular blood pressure (LVBP). The analysis shows that non-spectral features can track changes of the LVBP with lower standard deviation. Consequently, the non-spectral feature set gives the best prediction accuracy. The average correlation coefficient between the measured and the predicted blood pressure is 0.92 and the mean absolute error is 6.86 mmHg, even when the systolic blood pressure varies in the large range from 90 mmHg to 282 mmHg. Hence, systolic blood pressure can be accurately predicted even when using fewer HS features. This technique can be used as an alternative to real-time blood pressure monitoring and it has promising applications in home health care environments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A non-invasive approach to investigation of ventricular blood pressure using cardiac sound features

et al. 2017

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“…As reported, S2 is divided into A2 arising from the closure of aortic valve and P2 due to the closure of pulmonary valve, and the intensity of S2 increases with greater intensity in the closure of aortic valve. The internal pressure of the aorta is the force that closes the aortic valve [8]. Thus, the increase of the S2 amplitudes is due to the increase of the aortic pressure。 This pilot study demonstrated that the external-cuffinflation-deflation procedure on left upper arm had no significantly effect on the aortic pressure.…”

Section: Discussionmentioning

confidence: 74%

“…The relation between S2 and the arterial BPs from both systemic and pulmonary circulations has been confirmed in [5], [6], [7]. In addition, the ratio of S1 to S2 displayed the high correlation with systolic BP values [8]. External-cuffinflation-deflation (ECID) is a standard procedure for BP measurement, and will certainly influence the BP state in the arterial trees.…”

Section: Introductionmentioning

confidence: 97%

Changes in Amplitude Characteristics of Heart Sound Signals during External:cuff:inflation Procedure: A Pilot Study

Wang

Liu

et al. 2016

2016 Computing in Cardiology Conference (CinC)

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“…On the other hand, reference time points of SPI (QS1/S1S2) in healthy dogs using simultaneous ECG and PCG were not seen in the literature. Interestingly, the S1/S2 was seen as highly correlated with systolic blood pressure and was hypothesized to be related to myocardial contractile force [62], possibly, indicating systolic function. The clinical use of these STIs may be relevant in the presence of cardiac diseases such as MMVD, DCM, and advanced stages of heart failure where systolic dysfunction is apparent.…”

Section: Discussionmentioning

confidence: 99%

Use of proposed systolic and myocardial performance indices derived from simultaneous ECG and PCG recordings to assess cardiac function in healthy Beagles

et al. 2022

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Background and Aim: Cardiac time intervals (CTIs) can provide important information on the electrical and mechanical properties of the heart. We hypothesized that cardiac function can be described using the combined power of electrocardiography (ECG) and phonocardiography (PCG) signals. This study aimed to (1) validate a novel custom device in measuring CTI parameters; (2) compare CTI parameters with a commercially available device and standard transthoracic echocardiography (STE); and (3) compare calculated systolic performance index (SPI) and myocardial performance index (MPI) with Tei index from the STE. Materials and Methods: This study determined CTIs based on simultaneous ECG and PCG recordings in 14 healthy Beagle dogs using the custom-built device. These CTI parameters were compared with a commercially available device (Eko DUO ECG + Digital Stethoscope; Eko DUO) and the STE. Agreement of CTI parameters between the custom device and the commercially available device or STE was evaluated. Calculated SPI and MPI based on Wigger's diagram were proposed, compared with SPI and Tei index, and correlated with STE parameters. Results: We found that the ECG and PCG parameters measured from the custom-built device did not differ from the commercially available device and the STE. By combining ECG and PCG signals, we established CTI parameters in healthy dogs including indices for systolic function (SPI: QS1/S1S2) and global cardiac function {F1 ([QS1+S2]/S1S2), F2 ([RS1+S2]/S1S2), and F3 (RS1 + [QS2-QT]/S1S2)}. The SPI, F2, and F3 were comparable with echocardiographic parameters describing systolic (Pre-ejection period/left ventricular ejection time [LVET]) and Tei index ([MCOdur-LVET]/ LVET), respectively. Only SPI and F3 were correlated significantly with MCOdur and heart rate, respectively. Conclusion: We have validated the use of the custom-built device to describe CTIs that are comparable to the commercially available device and STE in healthy Beagles. The proposed SPI and MPI derived from CTI parameters can be useful in clinical practice to describe the cardiac function, especially in areas where access to STE is constrained.

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Correlation of blood pressure and the ratio of S1 to S2 as measuredby esophageal stethoscope and wireless bluetooth transmission

Cited by 6 publications

References 15 publications

A non-invasive approach to investigation of ventricular blood pressure using cardiac sound features

A non-invasive approach to investigation of ventricular blood pressure using cardiac sound features

Changes in Amplitude Characteristics of Heart Sound Signals during External:cuff:inflation Procedure: A Pilot Study

Use of proposed systolic and myocardial performance indices derived from simultaneous ECG and PCG recordings to assess cardiac function in healthy Beagles

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