Effects of transcutaneous electrical acupoint stimulation combined with general anesthesia for controlled hypotension on heart function and oxidation resistance of myocardium / 中国针灸

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the intervention effect of transcutaneous electrical acupoint sitmulation (TEAS) on heart under limiting level of controlled hypotension.</p><p><b>METHODS</b>Eighteen male Beagles were randomly divided into a general anesthesia group, a control group and an experimental group, 6 dogs in each group. All animals were applied with general anesthesia, and the animals of the control group and the experimental group were administered with combination of isoflurane and sodium nitroprusside (SNP) for controlled hypotension to 30% mean arterial pressure (30% MAP) of base line for 60 min. In the experimental group, TEAS (2 Hz/100 Hz, 6-8 mA) was applied to "Hegu" (LI4), "Zusanli" (ST 36), "Sanyinjiao" (SP 6) and "Quchi" (LI 11) from the beginning of physiological conditions stability to the end of maintained low MAP for 60 min. Creatine kinase isoenzymes MB (CK-MB) and lactate dehydrogenase (LDH) activity were detected at the base line and 2 h, 24 h, 48 h, 72 h after operation. Total superoxide dismutase (T-SOD) and malondialdehyde (MDA) in myocardium were observed at 72 h after operation.</p><p><b>RESULTS</b>The peak of LDH arrived at 24 h after operation and then restored in 3 groups. Compared with basal level, the activity of LDH in controlled group at 72 h after operation was significantly increased (P < 0.05), and in the other two groups no obvious change (P > 0.05). The activity of CK-MB arrived to peak from 2 h to 24 h after operation, and then came back gradually in 3 groups. Compared with postoperative 72 h of the same group, the control group at 48 h significantly increased (P < 0.05), while the other two groups had no statistically significant difference (P > 0.05). The content of MDA at 72 h after operation in controlled group was higher significantly than that in the general anesthesia group and the experimental group (both P < 0.05).</p><p><b>CONCLUSION</b>TEAS combined with anesthesia for controlled hypotension can elevate myocardial effect of anti-oxide free radical, reduce the postoperative release of LDH and CK-MB, so as to produce myocardial protection.</p>