Patients with coronary heart disease in cardiology, elderly women, experience recurrent palpitations that worsen with even slight noise. Coronary angiography results are acceptable, but conventional Western medical treatments are almost ineffective, and fast-acting nitroglycerin for heart relief is also nearly ineffective. Congested and swollen substantial pulse changes can be felt in the inch and guan positions of both left and right hands (this is the best I can describe personally), likely due to obstruction in the middle and upper jiao. Acupuncture was given at Neiguan, Ximen, Zhongwan, and other points attempting to unblock these congestions, but without effect. Later, senior brother Liu Jiayu @庸人 treated using the technique of transforming essence into qi. Upon palpation, congested lumps were felt at Jiquan and Shaohai (the sensation similar to the inch-guan pulse), followed by treatment (details in the course). The patient’s symptoms greatly improved, and upon re-checking the pulse, about 80% of the congestion disappeared. The next day, treatment was repeated; before treatment, palpation and pulse diagnosis showed varying degrees of regression at Jiquan, Shaohai, and inch positions. Further manual treatment was given, and the congestion disappeared again. Both treatments were effective for about half a day. It is currently unclear how to improve and extend the effective time or even achieve a cure.
After witnessing the miraculous effect of the technique, last night I practiced mutual manipulation with senior brother Wang Xianbiao @你好. Both parties clearly felt much more comfortable in the heart area, and the improvement was still noticeable after waking this morning. How long this improvement will last remains to be observed.
The significance of anatomical structure
In this case, I could distinctly feel that before manipulating Jiquan and Shaohai, it was essentially a lump of tissue; after manipulation, nearby arteries began to pulse. This relates to @你好 mentioning that some acupuncture points compress blood vessels and nerves and, by adjusting these switches, regulate the flow in these passages; see details at 讨论锁骨下肌的临床意义兼针灸老师推荐——汤立新、张学丽
After consulting references, it was found that these two points are indeed closely related to blood vessels.
Location of Jiquan:
“Huangdi Mingtang Jing”: Artery enters the chest between the tendons under the armpit.
“Zhenjiu Dacheng”: Artery enters the chest between the tendons under the inner armpit of the arm.
“Chinese Acupuncture”: With the arm abducted, at the center of the armpit, on the medial side of the axillary artery.

Location of Shaohai:
“Huangdi Mingtang Jing”: At the depression behind the medial elbow crease, the artery is palpable.

Combined with practice and theory, it should be a certain structure at these two points (possibly not only muscle) compressing blood vessels (possibly not only blood vessels).