What Does Spinal Anesthesia Do? Are There Any After-effects?

The accurate name for spinal anesthesia is subarachnoid block anesthesia, or lumbar anesthesia for short. It is one of the most commonly used anesthesia methods in surgical departments.

Subarachnoid block anesthesia is a commonly used anesthesia method in clinic. Local anesthesia is injected into the subarachnoid space and acted on the spinal nerve roots to anesthesia the corresponding site. It is called subarachnoid block, commonly known as spinal anesthesia, and because puncture is performed at the lumbar spine, it is referred to as lumbar anesthesia.

The main physiological effects are as follows:

(1) Nerve block

1. After local anesthetics are injected into the subarachnoid space, the first, last and scope of block are also different due to the different thickness of nerves.

2, the sympathetic nerve is the smallest, the fastest block, and the highest plane; Sensory nerve is the second, the block is late, the plane is higher; The motor nerve is the largest, the latest block, and the plane is the lowest.

(2) The influence on blood pressure

1. If the block plane exceeds chest 4, heart rate will be slowed down, cardiac output will be reduced, and blood pressure will be decreased due to the block of cardiac sympathetic fibers.

2. It is especially found in patients with hypovolemia, the elderly and those with venous return disorder (pregnancy).

(3) The effect on respiration

1. Low subarachnoid block has no effect on gas exchange.

2. When the plane rises to the chest, the intercostal muscles are gradually paralyzed, which will not affect the respiratory function in general patients due to the compensation of the diaphragm, but will have a serious impact on those with poor respiratory function reserve (obese, weak).

3, the intercostal muscle and abdominal muscle paralysis can make the patient cough weak.

(4) Influence on liver and kidney function

During subarachnoid block, renal perfusion can be increased due to renal vasodilation. If the anesthesia is not properly handled, the occurrence of a short period of hypotension may reduce the perfusion of the liver and kidney.

(5) The effect on uterine contraction

When the anesthesia plane is below chest 10, the cervical muscles relax and uterine muscles strengthen. When the plane is above chest 6, uterine muscles are also restricted. If there is a long time of hypotension can make the contraction weak.

As long as the operation is proper, there is no impact on health, let alone sequelae.