可阻滞性是循经感传的一个重要特征。过去的工作已经证明

在感传显著的受试者

压迫阻滞感传可使针刺效应显著减弱甚至消失

感传被阻滞

为什么针效即随之减弱甚而消失?这是一个十分值得注意的问题。为了分析引起这一现象的原因

本文进一步观察了在经络循行路线上施加压迫

对无感传的受试者的针效的影响。为了便于比较

实验是在有感传和无感传的两组受试者同时进行

现将初步结果报道如下:It has been reported that there was a close relation between the extent of distinctness of PSC and the effect of acupuncture on STI and cardiac ou- tput as Neiguan was punctured.In the patients with marked PSC the acupu- ncture effects decreased markedly

or even completely disappeared as PSC was blocked.In order to get an insight into the mechanism underlying the blocki- ng of PSC

an attempt was made in this work to compare the influence of m- echanica| pressure applied on the channel course upon the acupuncture effect in the subjects with or without PSC. Of 102 patients suffering from chronic coronary heart disease under observation

61 were males and 41 females

aged 30-74 years.Stimulating le- ft Neiguan

PSC appeared in 53 of the 102 patients

but not in the remaining 49.Mechanical pressure was applied on Ximen for blocking.The cardiac fu- nction and ECG were selected as indicators of acupuncture effect and followig indices were measured:cardiac systolic time Interval(PEPI

LVETI

P/LI)

Heather index(HI)

stroke volume(SV)

cardiac output(CO)

S-T segmet and T wave of ECG.The experiment was carried out on 3 successive days in each patient.On the first day Neiguan was punctured for a period of 15 minutes alone

to ascertain the variation of cardiac function elicited by acu- punclure.On the second and third days

mechanical pressure was applied on Ximen and the control point 2cm beside Ximen respectively

as Neiguan was punctured.The results showed;(1)The regulation of cardiac function was markedly influenced by puncturing Neiguan in both the patients with and wi- thout PSC

but it is more obvious in the former than in the latter.(2)The effect of puncturing Neiguan decreased or disappeared when the mechanical pressure was applied on the course of Pericardium Channel during acupunctu- re

no matter whether the patients were with or without PSC.However the pressure had to be applied on the channel course

otherwise no influence could be found.It can be seen from the facts mentioned above that PSC was only a phenomenon

which reflected a certain objective process

but not the pro- cess itself.There may be a certain substantial process advancing along the channel during acupuncture.Just because this substantial process was blocked by mechanical pressure

resulting in the decrease of acupuncture effect.These results provide further evidences for the explanation of the mechanism of the phenomenon of blocking of PSC and acupuncture effect from the angle of “blocking of the channels on periphry”.