On Measuring the Changes in Stroke Volume from A Peripheral Artery by Means of Electrical Impedance Plethysmography
In the study, we assessed the change in the left ventricular stroke volume from a radial artery by using an electrical impedance plethysmographic device. This device mainly incorporated tetra-polar electrodes, two of which were excited by an ac constant current source, and the other two are the sensing electrodes. In theory, the voltage difference between the two sensing electrodes was inversely proportional to the radial arterial blood flow of interest. In order to alter the stroke volume, 13 volunteers were recruited to undertake a thirtysecond breath-hold maneuver. It was found that the impedance waveform registered in the lower arm had a significantly higher amplitude (2.24 ± 0.43 Volts) just after the 30-second breath-hold than in the steady state (1.81 ± 0.47 Volts) (p<0.001). In addition, a linear regression coefficient of 0.85 was found between the change in the stroke volume measured by a 2-D ultrasound system, and the change in the impedance amplitude before and after the breath-hold maneuver. In conclusion, we may noninvasively and continuously monitor the subjects stroke volume via a peripheral artery by means of the electrical impedance plethysmography.
Impedance plethysmography Stroke volume Breath-hold Impedance Radial artery
Jia-Jung Wang Wei-Chih Hu Tsiar Kao Chun-Peng Liu
Department of Biomedical Engineering I-Shou University Kaohsiung, Taiwan Department of Biomedical Engineering Chung-Yuan Christian University Chungli, Taiwan Institute of Biomedical Engineering National Yanh-Ming University Taipei, Taiwan Department of Internal Medicine Kaohsiung Veterans General Hospital Kaohsiung, Taiwan
国际会议
上海
英文
1409-1412
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）