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Different types of Anesthesia: General vs Twilight vs Local

June 27, 2023

3 min read

Anesthesia is a treatment involving drugs called anesthetics. Anesthesia is typically administered during surgery and other medical procedures to keep you pain-free and comfortable.

Some anesthesia numbs a small area of your body, while others make you unconscious during surgical procedures.

How does anesthesia work?

Anesthesia is a drug that blocks pain and other sensory signals from nerves to the brain center. It can numb part of your body or your brain to conduct surgical procedures in a pain-free manner.

Who performs anesthesia?

When anesthesia is used locally, like in a dentist’s office, to numb an area for a procedure, the person performing the procedure generally performs anesthesia.

In the case of complex invasive medical procedures, anesthesia is performed by a physician called an anesthesiologist. The doctor uses specialized training to manage your pain before, during, and after the surgery.

Types of anesthesia

There are four main types of anesthesia used in surgeries and medical procedures. The type you receive will depend on factors like your medical history, health, and preferences.

The different types of anesthesia are as follows:

General anesthesia

General anesthesia is used when you must be utterly unconscious during an invasive surgical procedure. Doctors administer general anesthesia as gas directly inhaled through a mask or liquid or injected into a vein.

Once the surgery is complete, the anesthesiologist will stop giving anesthesia allowing the patient to wake up gradually.

Patients under general anesthesia have no memory of the surgery and feel no pain.

Side effects:

General anesthesia can have the following side effects:

Drowsiness that typically goes away with 1-2 hours of surgery
Nausea and vomiting
Sore throat

Regional anesthesia (Nerve blocks)

Regional anesthesia is used to numb an area before a medical procedure. Before performing the medical procedure, the anesthesiologist injects local anesthesia into the cluster of nerves that provides sensation to that area.

The two common types of regional anesthesia are:

Epidural anesthesia is most commonly used for childbirth involving labor or c-sections and occasionally in colon and gastrointestinal tract surgeries.
Spinal anesthesia is typically used in surgeries of the lower abdomen and the lower extremities.

Sometimes, regional anesthesia is combined with sedation to help patients relax during the procedure. Regional anesthesia is combined with general anesthesia in significant operations like the chest or abdomen for significantly better pain management.

Twilight anesthesia or sedation

Sedation is typically used to help the patient relax. It is used in minor surgeries or short, uncomplicated medical procedures where it is insufficient to give local anesthesia and general anesthesia is not required.

Also known as monitored anesthesia care, sedation involves providing medications through an IV, making the patient drowsy and relaxed before the procedure.

The levels of sedation depend on the procedure type and patients’ preferences.

Mild sedation is used in eye surgeries where the patient is awake and can respond to questions;
Moderate sedatives are done where patients doze off but awake quickly;
Deep sedatives are done using medications, like propofol for upper endoscopy or colonoscopy.

Twilight anesthesia is given in lower doses than general anesthesia, with fewer side effects and a lower cost.

Local anesthesia

Local anesthesia is injected through a needle or used as a cream to numb a small area. It relieves enough pain for limited procedures like filling dental cavities or stitching a wound.

Unlike general and twilight anesthesia, local anesthesia does not affect the patient’s consciousness. It does not have many side effects, other than perhaps soreness at the injection site, and involves far lower costs.

Sometimes local anesthesia can be combined with general or twilight anesthesia to relieve pain and discomfort during surgeries.

Is anesthesia safe?

Anesthesia is generally very safe for most patients, considering the advanced training, medications, and equipment involved in the process. However, it can have some complications like:

Allergic reactions: Some patients can experience severe allergic reactions to anesthesia. However, most people recover, and treatments are available that can effectively handle such situations during surgery.
Awareness during surgery: Some patients stay awake and feel pain when they are supposed to be unconscious during surgery.
Delirium: People, especially those above 60, can experience delirium for several days following surgery.
Medical conditions like heart disease, high blood pressure, and a history of malignant hyperthermia can create complications.

What Else to Know About Anesthesia

Follow your doctor’s instructions as to what to do before undergoing anesthesia. This can include things like

When to stop drinking and eating
When to stop taking certain supplements or medications

Also, in the days before getting anesthesia, let your doctor know if you developed a cold or are experiencing any breathing issues.

Sources

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General information, not medical advice

This article can't account for your health history or current treatment. Talk to a qualified clinician before you change anything about your care.

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