Anesthesia science is an indispensable part of modern medicine, and general anesthesia, as one of the most important and complex fields, provides necessary support for the successful conduct of medical surgeries. It is a highly specialized branch of medicine that allows patients to enter a painless, unconscious state during surgery or other medical procedures through the use of medication, providing doctors with a safe and efficient operating environment.
1、 What is general anesthesia?
General anesthesia, abbreviated as general anesthesia. It refers to the temporary inhibition of the central nervous system caused by the inhalation of anesthetics through the respiratory tract, intravenous or intramuscular injection, clinically manifested as loss of consciousness, disappearance of systemic pain sensation, forgetfulness, reflex inhibition, and skeletal muscle relaxation.
Why is general anesthesia necessary? General anesthesia is usually used when large or complex surgeries need to be performed, as the surgery may cause significant pain and discomfort. General anesthesia can eliminate these discomforts while relaxing the patient's muscles, making surgical procedures more convenient. In addition, general anesthesia can also reduce patients' stress reactions, alleviate psychological burden, and facilitate the progress of surgery.
2、 Classification of General Anesthesia
General anesthesia can be classified into different types based on different administration methods and types of drugs. Among them, the two most commonly used types are intravenous general anesthesia and inhalation general anesthesia.
Intravenous general anesthesia refers to the delivery of anesthetic drugs into the patient's body through intravenous injection. The types of anesthetic drugs used in this method mainly include propofol, fentanyl, propofol, etc. These drugs can quickly suppress the central nervous system, causing patients to lose consciousness, sensation, and pain, while also slowing down their breathing and lowering blood pressure. However, this anesthesia method is not often used because it causes certain damage to organs such as the liver and kidneys.
Inhalation general anesthesia refers to the process of causing a patient to lose consciousness, sensation, and pain sensation by inhaling anesthetic drugs. The most commonly used inhaled anesthetics are sevoflurane and isoflurane, which can inhibit the central nervous system, causing patients to lose consciousness, sensation, and pain. They can also slow down breathing and lower blood pressure, but this anesthesia method causes minimal damage to organs such as the liver and kidneys.
In general anesthesia, the administration of anesthetic drugs is relatively simple. Patients only need to inhale anesthetic drugs through a mask or oxygen mask, which usually takes 2-4 minutes. After the patient's consciousness, sensation, and pain completely disappear, the surgery can begin.
Overall, general anesthesia can effectively alleviate patients' pain and discomfort during surgery, while also reducing their stress response, which helps to ensure the smooth progress of the surgery.
3、 The working principle of general anesthesia is to use specific anesthetic drugs to affect the brain and nervous system, resulting in painless and unconscious effects. These anesthetics can inhibit the excitability of nerve cells, putting the brain and nervous system in an inhibitory state, leading to the disappearance of consciousness, sensation, and pain.
Specifically, these anesthetic drugs can enter the body by inhalation or intravenous injection, and then spread through the circulatory system to the brain and other nervous systems, exerting inhibitory effects on nerve cells. This inhibitory effect can weaken or stop the activity of nerve cells, thereby reducing the transmission of nerve signals and leading to the disappearance of consciousness, sensation, and pain.
During general anesthesia, the concentration and administration speed of anesthetic drugs need to be precisely controlled to ensure anesthesia effectiveness and patient safety. Generally speaking, the higher the concentration of anesthetic drugs and the faster the administration speed, the more obvious the disappearance of consciousness and painless state of the patient. However, excessive concentration and rapid administration of anesthetic drugs can also lead to complications such as respiratory depression and hypotension. Therefore, anesthesiologists need to make precise control based on the complexity of the surgery and the specific situation of the patient.
4、 The process of general anesthesia includes three main stages: anesthesia induction stage, anesthesia maintenance stage, and anesthesia recovery stage.
During the anesthesia induction phase, patients typically receive an inhaled anesthetic such as sevoflurane or isoflurane, which can quickly cause the patient to lose consciousness. In addition, to ensure that the patient's respiratory tract remains unobstructed, anesthesiologists usually place a laryngeal mask or tracheal tube on the patient to maintain airway patency.
During the anesthesia maintenance phase, anesthesiologists need to continuously adjust the concentration and administration speed of anesthetic drugs according to the needs of the surgery and the patient's condition. At this stage, anesthesiologists need to closely monitor the patient's vital signs, including blood pressure, heart rate, respiratory rate, blood oxygen saturation, and other indicators, to ensure the patient's safety.
After the surgery is completed, the anesthesia recovery phase begins. At this stage, anesthesiologists need to gradually reduce the concentration and administration speed of anesthetic drugs to help patients gradually regain consciousness. At the same time, in order to ensure that patients can be safely transferred from the operating room to the recovery room or ward, anesthesiologists also need to continue monitoring the patient's vital signs and providing necessary care and attention.
5、 Post anesthesia nursing work
Post anesthesia nursing work mainly includes the following aspects:
1. Respiratory tract patency: Maintaining respiratory tract patency is very important, especially for patients under general anesthesia. During anesthesia recovery, patients may experience vomiting, laryngeal spasms, and blockage of respiratory secretions, which should be promptly cleared to avoid suffocation.
2. Circulation stability: Monitor the patient's circulatory system indicators such as blood pressure, heart rate, and heart rhythm to ensure the stability of the circulatory system. If the patient experiences hypotension, bradycardia, or arrhythmia, immediate treatment should be taken.
3. Temperature regulation: After anesthesia, the patient's body temperature may be affected, leading to a decrease in temperature, chills, and other symptoms. Attention should be paid to monitoring the patient's body temperature. If the patient experiences hypothermia, timely measures should be taken to keep warm.
4. Preventing accidental injuries: During the recovery period of anesthesia, patients may experience agitation, confusion, and other situations. Attention should be paid to preventing accidental injuries to patients, such as falling off the bed, self extubation, etc.
5. Pain management: After anesthesia, patients may experience pain. The severity of the patient's pain should be evaluated, appropriate painkillers should be given, and the analgesic effect should be observed.
6. Dietary management: After most anesthesia surgeries, fasting is required. When the fasting period is over and the patient can resume eating, easily digestible foods should also be given as much as possible.
General anesthesia is a great achievement in modern medicine, allowing doctors to perform various complex surgeries and medical procedures in a safe and painless environment, providing valuable treatment opportunities for patients. However, anesthesia medicine is also constantly developing and advancing to meet the ever-changing medical needs and technological challenges.