Types of Anesthesia
During surgery, you will be given some form of anesthesia -- medicine administered for the relief of pain and sensation during surgery. The type and dosage of anesthesia is administered by the anesthesiologist. When a patient faces surgery, he/she will meet with the anesthesiologist before the procedure. The anesthesiologist will review the patient’s medical condition and history to plan the appropriate anesthetic for surgery.
There are various forms of anesthesia. The type of anesthesia you will receive will depend on the type of surgery and your medical condition. Usually, an anesthesiologist will administer a sedative in addition to the anesthetic. The different types of anesthesia are as follows:
Local anesthesia - local anesthesia is medicine given to temporarily stop the sense of pain in a particular area of the body. A patient remains conscious during a local anesthetic. For minor surgery, a local anesthetic can be administered via injection to the site. However, when a large area needs to be numbed, or if a local anesthetic injection will not penetrate deep enough, physicians may resort to regional anesthetics.
Regional anesthesia - regional anesthesia means numbing only the portion of the body which will be operated on. Usually an injection of local anesthetic is given in the area of nerves that provide feeling to that part of the body. There are several forms of regional anesthetics, two of which are described below:
- Spinal anesthetic - often used for lower abdominal, pelvic, rectal, or lower extremity surgery. This type of anesthetic involves injecting a single dose of the anesthetic agent directly into the spinal cord in the lower back, causing numbness in the lower body.
- Epidural anesthetic - this anesthetic is similar to a spinal anesthetic and also is commonly used for surgery of the lower limbs and during labor and childbirth. This type of anesthesia involves continually infusing drugs through a thin catheter that has been placed into the space that surrounds the spinal cord in the lower back, causing numbness in the lower body.
General anesthesia - general anesthesia causes a patient to be unconscious during surgery. The medicine is either inhaled through a breathing mask or tube, or administered through an intravenous line -- a thin plastic tube inserted into a vein (usually in the patient’s forearm). A breathing tube may be inserted into the windpipe to maintain proper breathing during surgery. Once the surgery is complete, the anesthesiologist ceases the anesthetic and the patient wakes up in the recovery room.
About your anesthesiologist
Anesthesiologists are the physicians trained to administer and manage anesthesia given during a surgical procedure. They are also responsible for managing and treating changes in your critical life functions -- breathing, heart rate, and blood pressure -- as they are affected by the surgery being performed. Further, they immediately diagnose and treat any medical problems that might arise during and immediately after surgery.
Prior to surgery, the anesthesiologist will evaluate the patient’s medical condition and formulate an anesthetic plan which takes that patient’s physical condition into account. It is vital that the anesthesiologist know as much about your medical history, lifestyle, and medications as possible. Some particularly important information he/she needs to know includes the following:
Reactions to previous anesthetics - If you have ever had a bad reaction to an anesthetic drug, you need to be able to describe exactly what the reaction was and what your specific symptoms were. Give the anesthesiologist as much detail as possible, such as you felt nauseated when you woke up or the amount of time it took you to wake up, etc.
- Current herbal supplements - Certain herbal products, commonly taken by millions of Americans, can cause changes in heart rate and blood pressure, and may increase bleeding in some patients. The popular herbs gingko biloba (an herb used for many conditions associated with aging, including poor circulation and memory loss), garlic (an herb often used for cardiovascular conditions and to help prevent colds, flu, and other infectious diseases), ginger, and ginseng (used as a general tonic to increase overall body tone; considered helpful in elevating energy levels and resistance to stress) may lead to excess blood loss by preventing blood clots from forming. In addition, St. John’s wort (a popular herb used for mild to moderate depression) and kava kava (another popular herb used for depression and to elevate mood) may prolong the sedative effect of the anesthetic. The American Society of Anesthesiologists advises patients planning to have surgery to stop taking all herbal supplements at least two to three weeks prior to surgery to rid the body of these substances.
- Known allergies - Discussing any known allergies with the anesthesiologist is very important, as some anesthetic drugs trigger cross-allergies, particularly in persons who have allergies to eggs and soy products. Allergies to both foods and drugs should be identified.
- Recent and/or current prescription and over-the-counter medications - It is also important to let your surgeon and anesthesiologist know about both prescription medications and over-the-counter medications you are taking, or have recently taken. Certain prescription medications, such as coumadin, a blood thinner, must be discontinued for some time prior to surgery. In addition, as many people take a daily aspirin to prevent heart attack, and certain dietary supplements, physicians need to be aware of these habits, as they can prolong bleeding and interfere with muscle relaxants used by anesthesiologists.
- Cigarette smoking and drinking - Cigarette smoking and alcohol can affect your body just as strongly (and sometimes more strongly) than many prescription medications you may be taking. Because of the way cigarettes and alcohol affect the lungs, heart, liver, and blood, these substances can change the way an anesthetic drug works during surgery. It is important to let your surgeon and anesthesiologist know about your past, recent, and current consumption of these substances prior to surgery.
- Undergoing surgery can be a good motivator to quitting smoking. Most hospitals are smoke-free and physicians, nurses, and other health professionals will be there to give you support. In addition, you will heal and recover faster, especially in the incision area, or if your operation involves any bones. Quitting smoking also reduces your risk of heart disease and cancer.
- Use of street drugs(such as marijuana, cocaine, amphetamines, etc.) - Patients are often reluctant to discuss matters of illegal drug consumption, but you should remember that all conversations between you and your surgeon and anesthesiologist are confidential. It is crucial that he/she know about your past, recent, and current consumption of these substances. It is important to keep in mind that the only interest your physician has in this information is learning enough about your physical condition to provide you with the safest anesthesia possible.
Meeting the anesthesiologist before the surgery
Because anesthesia and surgery affect every system in the body, the anesthesiologist will conduct a preoperative interview. Sometimes this is done in person; in other cases, the anesthesiologist will interview you over the telephone. During this interview, the anesthesiologist will review your medical history, as well as discuss the information mentioned above. He/she will also inform you about what to expect during your surgery and discuss anesthetic choices with you.
If you have not personally met during the preoperative interview, the anesthesiologist will meet with you immediately before your surgery to review your entire medical history as well as results of any medical tests previously conducted. By this time, he/she will have a clear understanding of your anesthetic needs.
How are other existing pre-existing medical conditions handled during surgery?
If you have a pre-existing medical condition such as diabetes, asthma, heart problems, arthritis, etc., your anesthesiologist will have been alerted to this and will be well prepared to treat these conditions during your surgery, as well as immediately afterward. Anesthesiologists are trained to handle sudden medical problems related to the surgery, as well as any chronic conditions that may need attention during the procedure.
How is the patient’s condition monitored during surgery?
Monitoring is one of the most important roles the anesthesiologist handles during surgery. Second by second observation of even the slightest changes in a wide range of body functions gives the anesthesiologist a tremendous amount of information about the patient’s well-being. In addition to directing your anesthesia, the anesthesiologist will manage vital functions such as heart rate, blood pressure, heart rhythm, body temperature, and breathing. He/she will also be responsible for fluid and blood replacement, when necessary. Sophisticated technology is used to monitor every organ system and its functioning during surgery.