a life -saver acupoint

Do you know something about neiguan(内关)point? In traditional Chinese medicine, it is one of the most-commonly used points, whch plays an important role in treating various illnesses, especially heart disease.
One evening, I was wanted on the phone by one of my friends, who said that his heart disease took place again. He felt weak ,out of breath and had a cardiac pain. Even though he had taken some medicine which could treat heart disease, the angina was not alleviated at all. When I got there, I rubbed his neiguan points one after another. About two or three minutes later, his pain in the chest was gone and everything was in order soon. So we can say that neiguan is a life saver acupoint.
Neiguan’s location: 2 cun about the transverse crease of the wrist, between the tendons of m .palmaris longus and m . flexor radialis.
Note: cun is a length unit in traditional Chinese medicine. The width of the interphalangeal joint of the patient’s thumb is taken as 1 cun .