Parashar Rachna, Bajpai Manish, Goyal Manish, Singh Shraddha, Tiwari Sunita, Narayan V S
Department of Physiology, LLRM Medical College, Meerut U.P., India.
Indian J Physiol Pharmacol. 2012 Apr-Jun;56(2):117-24.
Impedance Cardiography (ICG) is a non invasive method useful for continuous monitoring of cardiac output but, it still has not found wide usage for measuring cardiac output in clinics and research. Most studies focused on comparing the cardiac output measured at rest with reference methods. In the present study we evaluated the validity of ICG against Doppler Echocardiography (DE) in measuring cardiac output changes that occur during static exercise. Cardiac output of 30 healthy males between 18-26 yrs of age was measured during supine rest, during and 5 min after completion of 3 minute static exercise by ICG and DE. The increase in cardiac output during exercise measured with ICG and DE does not differ significantly (1.04 +/- 0.72 L/min and 1.05 +/- 1.24 L/min respectively) and has significantly high correlation (r = 0.76, P < 0.001). The bias and limits of agreement are (-0.01 +/- 0.83) in acceptable limits. The pooled means of cardiac output measured by ICG and DE do not differ significantly and bears a significant correlation (r = 0.812, P < 0.001). The bias (d +/- s) calculated is 0.15 +/- 0.64 L/min. ICG could provide valid information regarding the relative changes in cardiac output.
阻抗心动图（ICG）是一种用于连续监测心输出量的非侵入性方法，但在临床和研究中测量心输出量方面仍未得到广泛应用。大多数研究集中于将静息时测量的心输出量与参考方法进行比较。在本研究中，我们评估了ICG相对于多普勒超声心动图（DE）在测量静态运动期间发生的心输出量变化方面的有效性。通过ICG和DE在30名年龄在18 - 26岁之间的健康男性仰卧休息时、3分钟静态运动期间及运动结束后5分钟测量心输出量。用ICG和DE测量的运动期间心输出量增加无显著差异（分别为1.04±0.72升/分钟和1.05±1.24升/分钟），且具有显著的高相关性（r = 0.76，P < 0.001）。偏差和一致性界限在可接受范围内为（-0.01±0.83）。ICG和DE测量的心输出量合并均值无显著差异，且具有显著相关性（r = 0.812，P < 0.001）。计算出的偏差（d±s）为0.15±0.64升/分钟。ICG可以提供有关心输出量相对变化的有效信息。
