ArticlePakistan journal of medical sciences2014
The correlation between the first heart sound and cardiac output as measured by using digital esophageal stethoscope under anaesthesia.
Article in Pakistan journal of medical sciences, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed.
- Exploratory clinical trial on the acoustic variability index for predicting fluid responsiveness during hepatectomy.Journal of clinical monitoring and computing · 2026Observational
- Phonocardiopulmography: the future of perioperative auscultation.Anesthesia and pain medicine · 2025Review
- Unobtrusive continuous hemodynamic monitoring method using processed heart sound signals in patients undergoing surgery: a proof of concept study.Biomedical engineering letters · 2025Article
- Correlations between heart sound components and hemodynamic variables.Scientific reports · 2024Article
- Regional respiratory sound abnormalities in pneumothorax and pleural effusion detected via respiratory sound visualization and quantification: case report.Journal of clinical monitoring and computing · 2022Article
- Use of proposed systolic and myocardial performance indices derived from simultaneous ECG and PCG recordings to assess cardiac function in healthy Beagles.Veterinary world · 2022Article
- A Wireless Electronic Esophageal Stethoscope for Continuous Monitoring of Cardiovascular and Respiratory Systems during Anaesthesia.Journal of biomedical physics & engineering · 2017Article
Corrections and comments
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveThe use of an esophageal stethoscope is a basic heart sounds monitoring procedure performed in patients under general anesthesia. As the size of the first heart sound can express the left ventricle function, its correlation with cardiac output should be investigated. The aim of this study was to investigate the effects of cardiac output (CO) on the first heart sound (S1) amplitude. Methods : Six male beagles were chosen. The S1 was obtained with the newly developed esophageal stethoscope system. CO was measured using NICOM, a non-invasive CO measuring device. Ephedrine and beta blockers were administered to the subjects to compare changes in figures, and the change from using an inhalation anesthetic was also compared.
resultsThe S1 amplitude displayed positive correlation with the change rate of CO (r = 0.935, p < 0.001). The heart rate measured using the esophageal stethoscope and ECG showed considerably close figures through the Bland-Altman plot and showed a high positive correlation (r = 0.988, p < 0,001).
conclusionIn beagles, the amplitude of S1 had a significant correlation with changes in CO in a variety of situations.
Indexed as
Identifiers
24772126PMC3998993What OpenQuestion holds
Registered trials
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