What does defibrillating mean?
Defibrillating refers to the act of delivering a controlled electric shock to the heart, most commonly through a device called a defibrillator, in order to stop a dangerous arrhythmia — especially ventricular fibrillation, in which the heart's muscle fibers twitch chaotically instead of contracting in a coordinated beat. By briefly stopping all electrical activity, the shock gives the heart's natural pacemaker a chance to resume a regular rhythm. The term appears almost entirely in medical, emergency-care, and journalistic contexts: paramedics may be described as defibrillating a patient in cardiac arrest, and automated external defibrillators (AEDs) now make it possible for trained bystanders to do the same. It carries no figurative or informal use; it remains a precise clinical term whose importance lies in its association with one of medicine's most time-critical interventions.
verbPresent participle of "defibrillate": to administer an electric shock to the heart using a defibrillator in order to restore a normal heartbeat, typically during cardiac arrest or certain arrhythmias.
- To apply an electric shock to the heart with a defibrillator in order to terminate a life-threatening arrhythmia such as ventricular fibrillation and restore normal rhythm.
"The paramedics were defibrillating the patient within minutes of arriving on scene."
"The emergency team spent several minutes defibrillating him before his pulse returned."
"Modern AEDs guide bystanders through defibrillating a victim of cardiac arrest safely."
The word literally means 'stopping the fibers' — because fibrillation is your heart's muscle fibers quivering chaotically instead of beating together.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of defibrillating
Defibrillating derives from "defibrillate," formed from the prefix "de-" plus "fibrillate," itself built on Latin "fibrilla," a diminutive of "fibra" meaning fiber. The name reflects what happens in ventricular fibrillation, when the heart's muscle fibers contract irregularly and independently rather than together. The compound entered English in twentieth-century medical usage alongside the development of electrical defibrillation as a clinical technique. It shares its root with words like fibril and fibrous.
Related word forms
How defibrillating is actually used
Strictly medical and technical in register; used almost exclusively by healthcare professionals, first responders, and medical writers. In everyday speech people more often say they were "given CPR" or that an AED was "used" rather than referring to someone as defibrillating.
Easily confused with defibrillating
"Defibrillating" is the verb form describing the act of shocking the heart, while "defibrillation" is the noun naming the procedure itself.