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Sedation is the reduction of irritability or agitation by administration of sedative drugs, generally to facilitate a medical procedure or diagnostic procedure. Examples of drugs which can be used for sedation include isoflurane, diethyl ether, propofol, etomidate, ketamine, pentobarbital, lorazepam and midazolam.[1]

Medical uses

Sedation is typically used in minor surgical procedures such as endoscopy, vasectomy, or dentistry and for reconstructive surgery, some cosmetic surgeries, removal of wisdom teeth, or for high-anxiety patients.[2] Sedation methods in dentistry include inhalation sedation (using nitrous oxide), oral sedation, and intravenous (IV) sedation. Inhalation sedation is also sometimes referred to as "relative analgesia".[citation needed]

Sedation is also used extensively in the intensive care unit so that patients who are being ventilated tolerate having an endotracheal tube in their trachea. It can also be used during a long term brain EEG to help patient relax.[citation needed]


There are studies claiming that sedation accounts for 40 percent to 50 percent procedure-related complications.[3] Airway obstruction, apnea, and hypotension are not uncommon during sedation and require the presence of health professionals who are suitably trained to detect and manage these problems. Aside from the respiratory depression, risks also include unintended levels of sedation, postoperative somnolence, aspiration,[4] and adverse reactions to sedation medications.[5] Complications could also include perforation, bleeding, and the stimulation of vasovagal reflexes.[6] To avoid sedation risks, care providers conduct a thorough pre-sedation evaluation and this process includes pre-sedation history and physicals with emphasis on the determining characteristics that indicate potential risks to the patient and potential difficult airway management.[7] This process can also reveal if the sedation period needs to be prolonged or additional therapeutic procedures are required.[8]

Levels of sedation

Sedation scales are used in medical situations in conjunction with a medical history in assessing the applicable degree of sedation in patients in order to avoid under-sedation (the patient risks experiencing pain or distress) and over-sedation (the patient risks side effects such as suppression of breathing, which might lead to death).[citation needed]

Examples of sedation scales include MSAT (Minnesota Sedation Assessment Tool), UMSS (University of Michigan Sedation Scale), the Ramsay Scale (Ramsay, et al. 1974) and the RASS (Richmond Agitation-Sedation Scale).[citation needed]

The American Society of Anesthesiologists defines the continuum of sedation as follows:[9]

In the United Kingdom, deep sedation is considered to be a part of the spectrum of general anesthesia, as opposed to conscious sedation.

In addition to the aforementioned precautions, patients should be interviewed to determine if they have any other condition that may lead to complications while undergoing treatment. Any head, neck, or spinal cord injuries should be noted as well as any diagnosis of osteoporosis.[citation needed]

Intravenous sedation

The most common standard conscious sedation technique for adults is intravenous sedation using Midazolam. This requires a needle to be put into a vein to deliver the medication; this is known as an IV cannula.[citation needed]

Indications:[citation needed]

Contraindications:[citation needed]

Sedation for pediatric patients

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Present drugs commonly used to sedate children: Methohexital; Thiopental; Benzodiazepines; Diazepam; Midazolam; Ketamine; Opioids; Morphine; Meperidine; Fentanyl.

Whenever it is necessary to sedate a child, one must consider the type of procedure planned (painful or nonpainful), the duration of the procedure (important in choosing the appropriate sedative), the underlying medical condition of the patient (proper fasting, contracted blood volume, interaction with other medications, and intact mechanisms of drug elimination), the need for anxiolysis or narcosis, and experience with alternative techniques or routes of administration.

A child undergoing a procedure that is nonpainful (e.g., CT scan or small laceration infiltrated with local anesthetic) does not require a narcotic. Conversely, a child undergoing a painful procedure may require an opioid.[10]

See also


  1. ^ Brown, TB.; Lovato, LM.; Parker, D. (Jan 2005). "Procedural sedation in the acute care setting". Am Fam Physician. 71 (1): 85–90. PMID 15663030.
  2. ^ "Sedation Dentistry for Anxious Patients". Archived from the original on 2014-09-23. Retrieved 2014-09-11.
  3. ^ Vargo, John (2016). Sedation and Monitoring in Gastrointestinal Endoscopy, An Issue of Gastrointestinal Endoscopy Clinics of North America. Philadelphia, PA: Elsevier Health Sciences. p. 465. ISBN 9780323448451.
  4. ^ Odom-Forren, Jan; Watson, Donna (2005). Practical Guide to Moderate Sedation/analgesia. St. Louis, MO: Elsevier Mosby. p. 84. ISBN 0323020240.
  5. ^ Vargo, John (2016). Sedation and Monitoring in Gastrointestinal Endoscopy, An Issue of Gastrointestinal Endoscopy Clinics of North America. Philadelphia, PA: Elsevier Health Sciences. p. 554. ISBN 9780323448451.
  6. ^ Skelly, Meg; Palmer, Diane (2006). Conscious Sedation: A Handbook for Nurse Practitioners. London: Whurr Publishers. pp. 69]. ISBN 1861562667.
  7. ^ Mason, Keira (2011). Pediatric Sedation Outside of the Operating Room: A Multispecialty International Collaboration. New York: Springer. p. 166. ISBN 9780387097138.
  8. ^ Winter, Harland; Murphy, Stephen; Mougenot, Jean Francois; Cadranel, Samy (2006). Pediatric Gastrointestinal Endoscopy: Textbook and Atlas. Hamilton, Ontario: BC Decker Inc. p. 59. ISBN 1550092235.
  9. ^ "Continuum of Depth of Sedation: Definition of general anesthesia and levels of sedation/analgesia". American Society of Anesthesiologists. 21 October 2009. Archived from the original (pdf) on 2010-11-20. Retrieved 2010-11-29.
  10. ^ Coté, Charles J. (February 1994). "Sedation for the Pediatric Patient: A Review". Pediatric Clinics of North America. 41 (1): 31–58. doi:10.1016/S0031-3955(16)38690-4.