Abdominal surgery on more of an adverse respiratory effects of the main factors are: to stimulate the diaphragm, the incision pain, reflex nerve stimulation, such as pulmonary hypertension.

Additionally, it can be used for thoracentesis to treat patients with pneumothorax, for abdominal paracentesis, and for brachial plexus nerve blocking anesthesia as well.

When acute anoxia, the skin, the abdominal cavity internal organs nerve is excited, shrinks the blood vessel function to get the advantage, therefore vasoconstriction;