Kyoung Hoon Lim, Department of Anesthesiology and Pain Medicine, Chungbuk National University Hospital, Republic of Korea.
Young Duck Shin, Department of Anesthesiology and Pain Medicine, Chungbuk National University Hospital, Republic of Korea.
Pak J Med Sci. 2013 Jul;29(4):1023-7. doi: 10.12669/pjms.294.3639.
Objective : Esophageal stethoscope has the advantage of being non-invasive, easily placed and capability to monitor the heart sound. This study was designed to determine whether the ratio of S1 to S2 analyzed by esophageal stethoscope and wireless bluetooth transmission can be accurate indicator that express the correlation with blood pressure.
Total 33 adult male and female without cardiac disorder and with normal heart rhythm were selected randomly as the subjects of this Study. Two microphones were used with one for acquisition of heart sound by connecting it to the esophageal stethoscope while the other was used to measure the background noise in the operating room. After having transmitted the heart sound measured with the esophageal stethoscope to the receiver by using bluetooth module, it was saved in PC and outputted, following removal of noise in the operating room and the respiratory sound. S1 and S2 were measured with computation of the ratio of S1 to S2. Correlations between the systolic blood pressure with each of the S1, S2 and ratio of S1 to S2 were examined by using correlation analysis.
The ratio of S1 to S2 displayed the highest correlation with the systolic blood pressure, with S1 and S2 also displaying positive correlation with the systolic blood pressure.
As the result of analysis of the heart sound and the systolic blood pressure measured by using the esophageal stethoscope, the radio of S1 to S2 displayed greater correlation with the systolic blood pressure in comparison to the S1.
食管听诊器具有非侵入性、易于放置和监测心音的优点。本研究旨在确定通过食管听诊器和无线蓝牙传输分析的 S1 与 S2 的比值是否可以作为表达与血压相关的准确指标。
本研究共纳入 33 名无心脏疾病且心律正常的成年男性和女性作为研究对象。使用两个麦克风，一个用于通过连接食管听诊器获取心音，另一个用于测量手术室的背景噪声。使用蓝牙模块将食管听诊器测量的心音传输到接收器后，将其保存到 PC 中，并在去除手术室和呼吸音的噪声后输出。计算 S1 与 S2 的比值。使用相关分析检查收缩压与 S1、S2 和 S1 与 S2 的比值之间的相关性。
S1 与 S2 的比值与收缩压相关性最高，S1 和 S2 与收缩压也呈正相关。
通过使用食管听诊器测量心音和收缩压的分析，S1 与 S2 的比值与收缩压的相关性大于 S1。
