General anesthesia is a method of anesthesia that uses drugs to inhibit the function of the central nervous system, causing people to lose consciousness, sensation, and autonomous movement ability. General anesthesia is a common medical procedure during surgery or pain treatment. This article will introduce readers to the relevant knowledge of general anesthesia, including its principles, drugs, processes and management, as well as risks and complications.
1、 The principle of general anesthesia
General anesthesia is mainly achieved by inhibiting the function of the central nervous system. The central nervous system is the main neural control system of the human body, including the brain, spinal cord, and neurons. During general anesthesia, drugs enter the brain through the bloodstream, inhibiting the electrical activity of neurons and causing loss of consciousness, sensation, and autonomous movement ability.
2、 The drugs commonly used in general anesthesia include sedatives, analgesics, muscle relaxants, etc. These drugs can be used alone or in combination to achieve the effect of general anesthesia.
1. Sedatives: Sedatives can induce sleep in humans, and commonly used sedatives include propofol, etomidate, etc. These drugs are injected intravenously into the human body, which can quickly induce sleep and inhibit the function of the central nervous system, thereby achieving the effect of general anesthesia. The use of sedatives is crucial during general anesthesia. Doctors will determine the appropriate type and dosage of sedatives based on factors such as the patient's age, weight, and health condition. Sedatives can induce a state of sleep, causing people to lose consciousness, sensation, and autonomous movement ability. After the surgery is completed, the patient will gradually wake up and the sedative effect will gradually disappear.
2. Analgesics: Analgesics can alleviate pain sensation, and commonly used analgesics include morphine, fentanyl, etc. These drugs enter the human body through intravenous injection or inhalation through the respiratory tract, and can inhibit pain transmission in the central nervous system, thereby reducing the sensation of pain. The use of analgesics is also very important during general anesthesia. The pain caused by surgery may lead to various complications, such as increased heart rate and elevated blood pressure. The use of analgesics can alleviate patients' pain sensation, improve their comfort and safety. After the surgery is completed, the analgesic effect will gradually disappear and the patient's pain sensation will gradually recover.
3. Muscle relaxants: Muscle relaxants can inhibit muscle tone in the human body, and commonly used muscle relaxants include cisatracurium and vecuronium bromide. These drugs can be used in combination with sedatives and analgesics to achieve better anesthesia effects. During general anesthesia, the use of muscle relaxants can relax muscles, inhibit coughing and respiratory movements, and facilitate surgical procedures. However, it should be noted that the use of muscle relaxants may cause complications such as respiratory depression and hypotension, so it is necessary to closely monitor the patient's respiratory and circulatory systems.
3、 The process and management of general anesthesia
The process of general anesthesia includes stages such as pre anesthesia evaluation, pre anesthesia preparation, anesthesia induction, surgical operation, and anesthesia recovery.
1. Pre anesthesia assessment: Doctors will evaluate the patient's physical condition, medical history, medication use, etc. to determine whether the patient is suitable for general anesthesia. The evaluation includes the patient's age, gender, weight, cardiopulmonary function, liver and kidney function, medical history, allergy history, etc. Based on the evaluation results, the doctor will determine the appropriate anesthesia plan and medication selection.
2. Preparation before anesthesia: Patients need to prepare in advance for surgery, such as fasting, changing surgical clothing, etc. Fasting refers to abstaining from eating or drinking for 6 to 8 hours before surgery to prevent vomiting or aspiration during the procedure. Changing surgical attire refers to the need for patients to wear specialized clothing for the operating room, such as surgical gowns.
3. Anesthesia induction: Before anesthesia induction, doctors will administer some sedatives and analgesics to the patient, gradually causing them to lose consciousness. Then, the doctor will administer anesthesia drugs through intravenous injection or respiratory inhalation to put the patient into a state of general anesthesia. During the induction period, doctors will adjust the dosage and type of anesthesia drugs based on the patient's reactions and vital signs to ensure the patient's safe entry into general anesthesia.
4. Surgical procedure: Under general anesthesia, if the patient loses consciousness, sensation, and autonomous movement ability, the doctor can perform the surgical procedure. The doctor will adjust the dosage and type of anesthesia drugs reasonably according to the surgical needs and the patient's response, to ensure the smooth progress of the surgery. At the same time, doctors will also monitor the patient's vital signs to promptly detect and address any potential issues.
5. Anesthesia recovery: After the surgery is completed, the doctor will gradually reduce the use of anesthesia drugs to help the patient gradually regain consciousness. After the patient regains consciousness, they will be transferred to the recovery room for monitoring and recovery. During the recovery period, doctors will continue to monitor the patient's vital signs and anesthesia recovery, and promptly address any potential issues. Only after the patient has fully recovered can they leave the hospital and go home for recuperation.
General anesthesia may cause respiratory complications such as respiratory depression, respiratory obstruction, pneumonia, etc. Among them, respiratory depression is one of the most common complications, mainly caused by the effects of sedatives, analgesics, and muscle relaxants. These drugs can inhibit the function of the patient's respiratory center and respiratory muscles, leading to weakened or stopped breathing. To prevent respiratory depression, doctors will use medication reasonably and closely monitor the patient's respiratory condition. During the surgical process, mechanical ventilation or artificial ventilation may be necessary to ensure smooth breathing for the patient.
In addition, respiratory obstruction is also one of the common complications of general anesthesia. This is mainly caused by laryngeal edema, laryngeal spasms, airway obstruction, and other reasons. To prevent respiratory obstruction, doctors will choose appropriate anesthesia methods and medications based on the patient's specific situation, and take corresponding measures such as placing a laryngeal mask and performing tracheal intubation.
In addition, general anesthesia may also cause respiratory infections such as pneumonia. This is mainly due to the patient being in a passive position during the surgery, and respiratory secretions are prone to accumulate in the lungs, leading to bacterial growth and infection. In order to prevent respiratory infections such as pneumonia, doctors will pay attention to keeping the patient's respiratory tract unobstructed, clearing respiratory secretions in a timely manner, and taking corresponding measures such as antibiotic treatment.
In short, general anesthesia may cause respiratory complications, but doctors will take corresponding measures for prevention and treatment to ensure the safety and health of patients.