Insufflation (Latin: insufflare, lit. 'to blow into') is the act of blowing something (such as a gas, powder, or vapor) into a body cavity. Insufflation has many medical uses, most notably as a route of administration for various drugs.
Gases are often insufflated into a body cavity to inflate the cavity for more workroom, e.g. during laparoscopic surgery. The most common gas used in this manner is carbon dioxide, because it is non-flammable and colorless and dissolves readily in blood. It is, however, not an inert gas.
Oxygen can be insufflated into the nose by nasal cannulae to assist in respiration.
Mechanical insufflation-exsufflation simulates a cough and assists airway mucus clearance. It is used with patients with neuromuscular disease and muscle weakness due to central nervous system injury.
Pump inhalers for asthmatics deliver aerosolized drugs into the lungs via the mouth. However, the insufflation by the pump is not adequate for delivery to the lungs, necessitating an active inhalation by the patient.
Nasal insufflation is the most common method of nasal administration. Other methods are nasal inhalation and nasal instillation. Drugs administered in this way can have a local effect or a systemic effect. The time of onset for systemic drugs delivered via nasal administration is generally only marginally slower than if given intravenously. The bioavailability of drugs administered nasally is generally significantly higher than drugs taken orally.
Examples of drugs given
Steroids (local effect) and anti-asthma medication
Decongestants (local effect)
Nasal administration can also be used for treatment of children or patients who are otherwise alarmed or frightened by needles, or where intravenous (IV) access is unavailable.
In the 18th century, the tobacco smoke enema, an insufflation of tobacco smoke into the rectum, was a common method of reviving drowning victims.
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^Ramaraj, R; Sugumaran, A; Khan, H; Mathialahan, T; George, P (2011). "Comparison of carbon dioxide (CO2) to air insufflation in colonoscopy". Gut. 60: A200. doi:10.1136/gut.2011.239301.421.