What does asystolic mean?
Asystolic is a clinical adjective describing a heart that has stopped contracting altogether — the condition known medically as asystole. In this state, the heart produces no effective pump action and no pulse can be felt, which on an electrocardiogram typically appears as a flat line rather than the familiar rhythmic spikes of a beating heart. The term is used almost exclusively by physicians, paramedics, and nurses, most often in emergency medicine and cardiology, as in phrases such as 'asystolic cardiac arrest' or 'an asystolic pause'. Because asystole represents one of the most critical forms of cardiac arrest, the word carries a serious, urgent connotation; it signals that immediate resuscitation efforts such as chest compressions are required. Though technical in register, it is a precise and valuable term for anyone reading about resuscitation or cardiovascular emergencies.
adjectiveRelating to or characterized by asystole, the complete absence of contraction of the heart, in which no effective heartbeat occurs and the heart's pumping action ceases.
- Of or pertaining to asystole; describing a heart that has ceased to contract and produce any effective beat.
"The paramedics recognized an asystolic rhythm on the monitor and immediately began CPR."
"The telemetry showed a prolonged asystolic pause lasting nearly six seconds."
"In cases of asystolic arrest, survival depends heavily on the speed of bystander CPR."
On an electrocardiogram, an asystolic heart draws the dreaded flatline — literally zero electrical activity where a pulse should be.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of asystolic
Asystolic derives from the noun asystole, formed from Greek roots: the prefix a- meaning 'without', plus systole, from Greek sustolē meaning 'contraction'. Systole itself entered European medical vocabulary through Latin from ancient Greek, and its companion term diastole ('dilation') shares the same origin. The adjective asystolic follows the standard English pattern of adding -ic to the noun stem, paralleling systolic and diastolic.
Related word forms
How asystolic is actually used
Strictly a medical and clinical term, used almost exclusively by healthcare professionals in cardiology, emergency medicine, and resuscitation contexts. It carries a grave connotation, since asystole is one form of cardiac arrest and is often irreversible.
Easily confused with asystolic
Diastolic refers to the normal relaxation phase of the heartbeat between contractions, whereas asystolic means there is no heart contraction at all.