Anesthesia: A Comprehensive Guide

Anesthesia is a cornerstone of modern medicine, enabling countless medical procedures and surgeries that would otherwise be impossible. If you're facing a procedure requiring anesthesia, you might feel a bit apprehensive. This article aims to provide a comprehensive overview of anesthesia, addressing common concerns and explaining the different types, processes, and considerations involved.

What is Anesthesia?

Anesthesia, pronounced "an-ess-thee-sha," refers to a medicine used during procedures and surgeries to cause a loss of feeling in all or part of your body. It is one of the most important and widely used discoveries in healthcare. Anesthetics allow individuals to comfortably and safely undergo various surgeries, both major and minor.

Types of Anesthesia

There are several main types of anesthesia, each suited for different procedures and patient needs. The selection of the best type of anesthesia depends on the type of procedure, the patient's health, and their preferences.

General Anesthesia

General anesthesia induces a state resembling deep sleep. However, it's distinct from normal sleep. It puts patients unconscious and unable to move. The medicine is administered either through a mask, where the patient breathes it in, or intravenously (through an IV). With general anesthesia, patients do not feel or remember anything during the procedure.

During general anesthesia, a flexible, plastic breathing tube may be inserted into your mouth and down your windpipe to ensure sufficient oxygen supply and protect the lungs from secretions or fluids.

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Local Anesthesia

Local anesthesia numbs only the specific part of the body where the procedure is being performed. It is typically administered as an injection (shot). For instance, if a procedure is being done on the thumb, the anesthesia is injected into the thumb, numbing only that area. The patient remains awake during the procedure. You stay awake. For minor surgery, a local anesthetic can be injected into the area. Or it may be absorbed into the skin.

Regional Anesthesia

Regional anesthesia numbs a larger region of the body, preventing any pain sensation in that area during the procedure. For example, if a thumb procedure is being performed, regional anesthesia would numb the entire arm. Sedation might also be administered alongside regional anesthesia.

There are three primary types of regional anesthesia:

Spinal Anesthesia: Medicine is injected into the lower back using a needle. This blocks pain and movement signals from traveling to the brain. The needle is removed after the medication is administered. Spinal anesthetic is used for lower abdominal, pelvic, rectal, or lower extremity surgery. A single dose of the anesthetic is injected into the area around the spinal cord in the lower back. It causes numbness in the lower body.
Epidural Anesthesia: Medicine is delivered through a small tube inserted into the back. This tube is often connected to a pump that provides a continuous supply of medication. The tube is removed once the pain control is no longer needed. Epidural anesthetic is often used for surgery of the lower limbs or during labor and childbirth. This type of medicine is given ongoing through a thin tube (catheter). The catheter is placed into the space around the spinal cord in the lower back. It causes numbness in the lower body. An epidural may also be used for chest or abdominal surgery. In this case, the medicine is injected at a higher place in the back.
Nerve Block: Medicine is injected near specific nerves to control pain during the procedure. In some cases, a small tube is placed near the nerve and connected to a pump for continuous medication delivery. The nerve block can stop or reduce pain for several hours after the procedure.

Sedation

Sedation involves administering medicine to induce relaxation or sleepiness. It is often given intravenously. While sedated, many individuals can still follow instructions. For some simple procedures, like colonoscopies, you may get IV or monitored sedation. This helps you relax while still being awake and responsive.

Who Administers Anesthesia?

Anesthesia is administered by a qualified healthcare professional, typically an anesthesiologist (a doctor specializing in anesthesia) or a certified registered nurse anesthetist (CRNA). A CRNA is a nurse with specialized training in anesthesia. In many hospitals, an anesthesiologist and a CRNA work together during the procedure.

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Throughout the procedure, a member of the anesthesia care team remains with the patient to ensure the body is functioning correctly. A resident doctor or student nurse anesthetist may also be part of the care team, supervised by experienced doctors and CRNAs.

Before the Procedure: Preparation and Evaluation

Before any anesthesia is administered, several steps are taken to ensure patient safety and comfort:

Consultation: You’ll have a conversation with your anesthesiologist or nurse. They’ll ask about your medical history, any allergies, and previous experiences with anesthesia. This is the perfect time to voice any concerns you have - they’re here to help you feel comfortable. This is also the time to discuss which medicines should be stopped, and which can continue before surgery.
Medical History Review: The care team will talk with you about your medicines and allergies. They will also review your health history. They will also tell you about what to expect during your surgery and discuss anesthetic choices with you. The anesthesia care provider will meet with you right before your surgery to review your entire health history, as well as the results of any medical tests previously done.
Medication Management: The care team will tell you which medicines to take before your procedure and discuss stopping or changing medicines you may take for diabetes, pain, or to thin your blood.
Fasting Instructions: You’ll be asked to fast for several hours before your procedure. This ensures your stomach is empty, which helps reduce the risk of complications during anesthesia. Rules about eating and drinking are set to allow enough time for food and liquid to empty from your stomach before your procedure.

Important Information to Share with Your Anesthesia Care Provider

It's vital that the provider knows as much about your health as possible. This includes your full health history, lifestyle, and medicines. Make sure you have told the healthcare team about all medicines, vitamins, and herbal supplements you take. It is important to inform your anesthesia care provider if you:

Have had a reaction to anesthesia in the past: If you've ever had a bad reaction to anesthesia, you need to be able to describe what the reaction was. Give as much detail as possible. Did you have nausea when you woke up?
Are taking any herbal supplements: Some common herbal products may cause changes in heart rate and blood pressure. They may also increase bleeding. Gingko biloba, garlic, ginger, and ginseng may lead to too much blood loss. They do this by preventing blood clots from forming. St. John's wort and kava kava may cause the effects of the anesthetic to last too long.
Have any allergies: Discuss any known allergies with the anesthesiologist. Some anesthetic drugs trigger cross-allergies, particularly in people who have allergies to eggs and soy products.
Are taking any medicines: This includes all prescription and over-the-counter medicines. Some medicines that thin the blood, such as aspirin or warfarin, must be stopped for several days or longer before surgery.
Smoke cigarettes: Cigarette smoking affects the lungs, heart, liver, and blood. This can change the way anesthesia works during surgery. Tell your healthcare providers about your past, recent, and current smoking.
Drink alcohol: Alcohol can also affect your heart, liver, and blood. It can also change the way anesthesia works during surgery.
Use of street drugs: This includes marijuana, cocaine, amphetamines, and others. This is because these drugs can affect healing and responses to anesthesia.

The Anesthesia Process: What to Expect

Once you’re ready for the procedure, you’ll be taken to the operating room, where a team of skilled professionals will be there to guide you through every step. Here’s what typically happens:

Getting Set Up: If you’re having general anesthesia or IV sedation, you’ll be hooked up to an IV. This is where the medication will be delivered. It may sting a little at first, but it’s a quick and easy step. For regional or local anesthesia, the process may involve a few injections to numb the area.
Feeling Relaxed: Once the anesthesia starts to take effect, you may feel a sense of warmth or drowsiness. Don’t worry if you feel a little light-headed or relaxed-that’s just the anesthesia doing its job.
Drifting Off: For general anesthesia, you’ll gradually drift off into a deep sleep. The last thing you might remember is the mask or IV being placed, and then you’ll wake up later in a recovery room, feeling like only a few minutes have passed. You won’t feel any pain during the procedure because the anesthesia keeps you comfortable and unaware.

During the Procedure: Continuous Monitoring

While you’re under anesthesia, the medical team is closely monitoring you. They’re checking your vital signs, making sure you’re stable, and adjusting the anesthesia as needed. They will closely watch for the slightest changes in a wide range of your body functions, such as heart rate and rhythm, blood pressure, body temperature, oxygen levels, and breathing. This gives a lot of information about your well-being. You won’t feel a thing, but they’re constantly keeping an eye on everything to ensure you’re safe and sound.

After the Procedure: Recovery and Aftercare

Anesthesia medicine is stopped after your procedure. When your procedure is over, the anesthesia will begin to wear off, and you’ll gradually start to wake up in a recovery room.

Waking Up: Recovery + Comfort

You'll slowly wake either in the operating room or the recovery room. You may feel groggy, disoriented or even a little chilly - all of this is normal. You’ll also likely be given some oxygen and may need a bit of time to fully wake up. Don’t be surprised if you feel a little emotional or confused when you first wake up. This is a common reaction, and it typically passes quickly. Your nurses will be right by your side, offering comfort and reassurance as you get your bearings.

Most people stay in the recovery area for 1 to 2 hours after the procedure. Then you will either go to a hospital room or go home. If you have serious health problems, you may go to an intensive care unit.

After the procedure: Taking care of yourself

Once you’re awake and alert, the anesthesia’s effects will start to fade. If you had a local or regional anesthetic, you might feel some tingling or weakness in the area, but that will wear off soon enough. If you had general anesthesia, you might be asked to stay in the recovery room for a little while longer until you’re feeling more yourself.

You’ll likely be given instructions for aftercare, including when you can eat, drink and take any medications. You might need someone to drive you home, as you may still feel a bit groggy.

Your care team will work with you to control your pain. Your anesthesia care team asks about your pain and other side effects. Side effects depend on your condition and the type of surgery.

Risks of Anesthesia

General anesthesia is generally safe. Most people don't have complications from general anesthesia. However, some surgeries or diseases may put you at a higher risk for complications. Before your procedure, you will have a chance to talk about the risks with your anesthesia care team.

Minor Risks: These are more common and include feeling sick or vomiting after the procedure, having a sore throat, teeth, or lips, or trouble swallowing, feeling pain or having bruises on your arm where the IV was, bruising or redness on your skin or some numbness.
Major Risks: These are very rare but can include drug reaction, heart attack, stroke, lung problems, bleeding, blindness, nerve damage or paralysis, brain damage, coma, or death.

Older adults or those with serious medical problems are at increased risk of confusion after surgery. They're also at higher risk of pneumonia, stroke or a heart attack after surgery.

Anesthesia Awareness

For general anesthesia, it's very rare for someone to be partially awake. Estimates vary, but about 1 or 2 people in every 1,000 may experience unintended intraoperative awareness. This is so rare that it's hard to understand why it happens. Most cases of unintended intraoperative awareness occur during urgent or emergency surgeries. Or they occur during unexpected emergencies in routine surgeries. When it happens, a person may experience stress or anxiety.

Eating and Drinking Before the Procedure: Why Fasting is Important

Our reflexes slow down when we are given anesthesia. One protective reflex is coughing to prevent stomach contents from going into our lungs (aspiration). This is like choking and is less likely to happen when your stomach is empty. Fasting (not eating or drinking) keeps your stomach empty. Aspiration or choking on solid or semi-solid stomach contents may block air getting into your lungs. Liquid stomach contents that are acidic may burn your lungs and also stop your lungs from getting air. Both types of aspiration may cause brain damage or death.

Aspiration can be treated. Most people survive, but treatment in an intensive care unit (ICU) is often needed. Aspiration may lengthen your hospital stay by days to weeks. Your stomach must be empty for the procedure. We do not want food from your stomach to get into your lungs during the procedure. Your procedure will be delayed if you do not or cannot follow eating and drinking instructions. People having an abdominal (belly) procedure may have special eating and drinking instructions.

The Role of Anesthesia in Modern Medicine

Anesthesia is one of the most important and widely used discoveries in healthcare. Because of anesthetics, you can comfortably and safely undergo all types of surgeries, big or small. Anesthesia allows for surgeries that would be impossible otherwise. Anesthesia care providers aren't just trained to handle medical issues related to the surgery. Because anesthesia and surgery affect every system in the body, the anesthesia care provider will interview you before surgery. They also manage and treat changes in your breathing, heart rate, and blood pressure during surgery.

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