Department of Anesthesiology, University Hospital RWTH Aachen, Aachen, Germany.
Anesth Analg. 2012 Feb;114(2):322-7. doi: 10.1213/ANE.0b013e31823f4182. Epub 2011 Nov 21.
Electrocardiography (ECG) requires the application of electrodes to the skin and often necessitates undressing. Capacitively coupled electrodes embedded in a normal chair would be a rational alternative for ECG screening. We evaluated the reliability and accuracy of ECG electrodes imbedded in a chair cushion.
Two independent clinicians compared ECG recordings obtained using skin electrodes with recordings obtained using capacitively coupled electrodes that were embedded in a chair cushion in an anesthesiology premedication room, a cardiology outpatient ward, and a cardiology day ward. We analyzed the data to compare the sensitivity and specificity for the diagnosis of cardiac arrhythmias.
ECG recordings were obtained from 107 patients. Heart rate was accurately measured using the capacitively coupled electrodes, but motion artifacts made the identification of P and T waves unreliable. Signal quality was poor for patients with low body weight, patients wearing clothing containing mixed fibers, and patients wearing sweaty shirts.
Heart rate was accurately measured, and some cardiac arrhythmias were correctly diagnosed using capacitive ECG electrodes. Capacitive electrodes embedded into an examination chair are a promising tool for preoperative screening. Improved artifact reduction algorithms are needed before capacitive electrodes will replace skin electrodes.
心电图（ECG）需要将电极应用于皮肤，通常需要脱衣。嵌入普通椅子中的电容耦合电极将是心电图筛查的合理替代方案。我们评估了嵌入椅子垫中的电极的心电图的可靠性和准确性。
两名独立的临床医生比较了在麻醉前准备室、心内科门诊和心内科日间病房中使用皮肤电极和嵌入椅子垫中的电容耦合电极获得的心电图记录。我们分析数据以比较诊断心律失常的敏感性和特异性。
从 107 名患者中获得了心电图记录。使用电容耦合电极准确测量了心率，但运动伪影使得 P 和 T 波的识别不可靠。体重较轻的患者、穿着含有混合纤维的衣物的患者和穿着汗湿衬衫的患者的信号质量较差。
使用电容心电图电极准确测量了心率，并且正确诊断了一些心律失常。嵌入检查椅中的电容电极是术前筛查的有前途的工具。需要改进减少伪影的算法，电容电极才能取代皮肤电极。
