The correlation between the first heart sound and cardiac output as measured by using digital esophageal stethoscope under anaesthesia

Authors

  • Young Duck Shin Chungbuk National University Hospital,cheongju,Korea
  • Kyoung Hoon Yim Chungbuk National University Hospital,cheongju,Korea
  • Sang Hi Park Chungbuk National University Hospital,cheongju,Korea
  • Yong Wook Jeon Chungbuk National University Hospital,cheongju,Korea
  • Jin Ho Bae Bae Department of Anesthesiology and Pain Medicine, College of Medicine, Chungbuk National University, Korea.
  • Tae Soo Lee Department of Biomedical Engineering, College of Medicine, Chungbuk National University, Korea.
  • Myoung Hwan Kim Laboratory Animal Research Center, Chungbuk National University, Korea.
  • Young Jin Choi Department of Surgery, College of Medicine, Eulji University, Korea.

DOI:

https://doi.org/10.12669/pjms.302.4383

Keywords:

Cardiac output, First heart sound, Heart rate, Stethoscope.

Abstract

Objective: The 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.

Results: The 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).

Conclusion: In beagles, the amplitude of S1 had a significant correlation with changes in CO in a variety of situations.

doi: http://dx.doi.org/10.12669/pjms.302.4383

How to cite this:Shin YD, Yim KH, Park SH, Jeon YW, Bae JH, Lee TS, et al. The correlation between the first heart sound and cardiac output as measured by using digital esophageal stethoscope under anaesthesia. Pak J Med Sci 2014;30(2):276-281.

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Published

2014-02-25

How to Cite

Shin, Y. D., Yim, K. H., Park, S. H., Jeon, Y. W., Bae, J. H. B., Lee, T. S., … Choi, Y. J. (2014). The correlation between the first heart sound and cardiac output as measured by using digital esophageal stethoscope under anaesthesia. Pakistan Journal of Medical Sciences, 30(2). https://doi.org/10.12669/pjms.302.4383

Issue

Vol. 30 No. 2 (2014): March - April 2014 Pak J Med Sci

Section

Original Articles