Twilight anesthesia is commonly known as I.V. sedation and calls for an easy awakening and speedy recovery time by the patient. Anesthesia is used to control pain by using medicines that reversibly block nerve conduction near the site of administration, therefore, generating a loss of sensation at the area administered. Close monitoring by the anesthesiologist will sometimes be provided, to help keep the patient comfortable during a medical procedure, along with other drugs to help relax the body. It can also help control breathing, blood pressure, blood flow, and heart rate and rhythm, when needed.
There are four levels of sedation by anesthesia which include the following:
Level One
In this level called Minimal sedation which results in anxiolysis, a drug induced state in which the patient responds normally to verbal commands, while the doctor drills away. Although the cognition and coordination of the patient are impaired, cardiovascular and ventilatory functions remain unaffected.
Level Two
In this level called Moderate sedation/analgesia or conscious sedation’, a drug induced depression of consciousness during which the patient responds purposefully to verbal commands, either alone or accompanied with light physical stimulation. Breathing tubes are not required for this type of anesthesia. This is Twilight Anesthesia.
Level Three
In this level called Deep sedation/analgesia, a drug-induced depression of consciousness during which the patient cannot be easily aroused, but respond purposefully following repeated or painful stimulation. Ventilatory functions may be impaired, breathing tubes are required. Cardiovascular functions are usually sustained.
Level Four
In this level called Anesthesia, a combination of general anesthesia and spinal or major regional anesthesia. It does not include local anesthesia. Ventilatory function is often impaired and cardiovascular functions may be impaired.