[Clinical observation on injection of small dose of morphine into Neiguan (PC 6) for treatment of chest pain in the patient with acute myocardial infarction].

Objective: To probe into an effective injection way of Morphine for treatment of chest pain of acute cardiac infarction.

Methods: Ninety cases of myocardial infarction were randomly divided into 3 groups, an acupoint-injection group, an intravenous injection group and a hypodermic injection group, 30 cases in each group. The acupoint-injection group were treated with injection of 2 mg Morphine into bilateral Neiguan (PC 6) respectively, and the intravenous injection group with intravenous injection of 5 mg Morphine and the hypodermic injection group with hypodermic injection of 5 mg Morphine, and other treatments were same in the 3 groups. The analgesic effects were assessed with visual analogue scale (VAS) 5, 10, 30, 60 and 180 minutes after treatment and the complications were observed.

Results: There were no significant differences among the 3 groups before treatment in the VAS score (P > 0.05). The analgesic effect in the acupoint-injection group was better than those in other two groups 5 min, 30 min and 180 min after treatment (all P < 0.01). The incidence rate of nausea and vomiting of 0.3% in the acupoint-injection group was significantly lower than 40.0% in the intravenous injection group and 20.0% in the hy podermic injection group (all P < 0.01).

Conclusion: Injection of small dose of Morphine into Neiguan (PC 6) has a definite therapeutic effect on chest pain of acute myocardial infarction with earlier analgesic effect, smaller dose of Morphine, longer analgesic duration and less complications.