many patients and their families wonder why normal saline should be injected before operation? This is based on the consideration of many factors, mainly in the following aspects. Come and have a look.
The first
replenishes the fluid in the patient. Before surgery, patients often undergo 8 hours of fasting and water deprivation. The body fluid capacity is obviously insufficient. Especially in children, the elderly, ischemic cerebrovascular and cerebrovascular diseases, diabetes mellitus, long time body fluids can not make ends meet. Therefore, it is necessary to supplement fluid before operation to maintain the balance of water and electrolyte in the body and avoid causing internal environment disorder.
although the time of fasting water has been changed in foreign countries, for example, you can drink clean water 2 hours before operation, in China, for the safety of operation, fasting water before operation generally exceeds 6-8 hours.
6-8 hours without eating or drinking. If the operation is unfortunately late, you may not eat or drink for more than 12 hours. Not eating is generally tolerable, but not drinking water for too long will not only make the patient feel painful, but also make the whole body worse. In such a bad state, the risk of anesthesia and surgery will be greater.
in addition, our body will produce various protective measures against external stimuli, which require energy supply. After fasting for 8 hours, due to lack of energy, it is likely to lead to abnormal normal protective measures of the body, especially for older people. And we can’t let the patients eat and drink, for fear that the patients may vomit, inhale by mistake or even suffocate due to anesthetic drugs or other factors during the operation.
so before surgery / anesthesia begins. The medical staff will infuse the patient with water and energy in advance, so as to return the patient’s body to the best possible state, so as to cope with the coming & ldquo; Storm & rdquo;.
Second,
some operations require a large amount of preoperative infusion of normal saline to expand the volume in advance, so as to prevent sudden drop of blood pressure during the operation. For example, a large amount of normal saline needs to be injected before pheochromocytoma operation.
The third
is the drug delivery channel for indwelling general anesthesia. Another function of infusion before operation is to prepare for various drugs after entering the operating room. The operation is carried out under anesthesia. Intravenous general anesthetics infuse blood through venous channels and play a role as the systemic blood circulation reaches everywhere.
preoperative intravenous drip just provides a channel for intravenous anesthesia. In addition, some rescue drugs may be used during the operation, which are also intravenous drugs, such as epinephrine, norepinephrine, dopamine, antiarrhythmic drugs, etc. Indwelling venous channel can ensure that these drugs can reach the organs as soon as possible, give play to the curative effect, and strive for time for rescuing patients.
people who have been transfused know that the needle must be punctured accurately. Under normal circumstances, although there is blood flowing in our blood vessels, it is not particularly obvious, so the nurse will strangle her arm with a tourniquet when injecting the needle, so that the blood stasis can fill the blood vessels, and the blood vessels can be seen when they bulge, so as to plunge into the infusion.
note, however, that the basis of all this is sufficient blood flow in the blood vessels.
and once we have [shock] due to allergy, blood loss, pain and other factors. The blood in our blood vessels will be reduced instantaneously, so that the blood vessels will be deflated directly.
you can imagine that at such a critical moment, if the intravenous channel for administration is not established in advance (the needle is tied), the nurse needs to temporarily put a needle on the deflated blood vessel, which is difficult to imagine and can hardly be pierced. At that time, time was life. If the medicine was given for one second every night, the rescue success rate would be reduced by 1 point.
for hundreds of years, after the painful lessons of blood brought by countless lives, medical staff learned to prepare for a rainy day. Before this happens, they pricked the needle when the blood vessels are good. In this way, if there is an accident due to sudden shock, it is good to give rescue drugs directly to the liquid.
many times, especially for operations that are particularly large and may require a large number of rapid blood transfusion and fluid replacement during the operation, we will even tie several needles at the same time to establish several venous channels, so that we can supplement blood or rescue drugs to the body in time in danger.
in addition, the established venous channel can be used to give analgesic or rehydration drugs after operation, even if it is not used for rescue.
Fourth,
the normal saline injected before operation may contain broad-spectrum antibiotics. For some operations that need to open the peritoneal cavity, anti-inflammatory drugs need to be used for preventive treatment before operation, which can greatly reduce postoperative infection.
to sum up, now you understand that the medical staff must give infusion before operation. On the one hand, it is to supplement the water and energy lacking in fasting water before operation, and more importantly, it is to prevent the inability to give medicine quickly in case of accidents.