fibrillation
C1-C2 / Low-frequency technicalFormal; primarily medical/technical.
Definition
Meaning
A rapid, irregular, and uncoordinated contraction of muscle fibres, most commonly referring to cardiac muscle (heart).
Any rapid, unsynchronised, or quivering muscular contraction; by extension, can describe rapid, chaotic activity in other systems (e.g., 'atrial fibrillation of the financial markets').
Linguistics
Semantic Notes
The term almost always refers to a pathological, life-threatening condition in cardiac contexts. It is distinct from a normal, coordinated muscle contraction. The 'fibre' in fibrillation refers to muscle fibres, not dietary fibre.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or semantic differences. Spelling is identical. Both use 'fibrillation' as the standard noun.
Connotations
Identical strong medical/clinical connotations. The word carries the same urgency and specificity in both varieties.
Frequency
Equally low-frequency in general discourse, but standard and common within cardiology and general medical contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
to be in (a state of) ~to suffer from ~to go into ~to trigger ~~ of the [atria/ventricles/muscle]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms. Technical term.]”
Usage
Context Usage
Business
Rare. Figurative use possible: 'The market experienced a period of fibrillation after the announcement.'
Academic
Common in medical, biological, and physiological research papers and textbooks.
Everyday
Very rare outside of discussing specific heart conditions with a doctor.
Technical
The primary domain. Standard term in cardiology, emergency medicine, and physiology.
Examples
By Part of Speech
verb
British English
- The patient's heart began to fibrillate.
- The atria can fibrillate for years before detection.
American English
- The muscle tissue started to fibrillate under the electrode.
- If the heart fibrillates, defibrillation is needed.
adverb
British English
- [No standard adverbial form. Very rare.]
- The muscle contracted fibrillatingly? (Unnatural)
American English
- [No standard adverbial form. Very rare.]
adjective
British English
- He was diagnosed with a fibrillating atrium.
- The fibrillatory activity was visible on the monitor.
American English
- The patient was in a fibrillatory state.
- They observed fibrillatory waves on the ECG.
Examples
By CEFR Level
- [Too technical for A2. Use:] The doctor said his heart was beating in a bad way.
- Atrial fibrillation is a common heart problem.
- An irregular heartbeat can be serious.
- The patient was admitted to hospital with suspected atrial fibrillation.
- Ventricular fibrillation is a medical emergency that requires immediate defibrillation.
- Persistent atrial fibrillation increases the risk of stroke considerably.
- The study examined the electrophysiological mechanisms underlying the initiation of fibrillation in cardiac tissue.
Learning
Memory Aids
Mnemonic
Think of FIBRE + VIBRATION. Muscle FIBRES VIBRATING or quivering uncontrollably instead of contracting properly.
Conceptual Metaphor
CHAOS IS FIBRILLATION (e.g., a system in fibrillation is out of control and dysfunctional).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'фибрилляция' (direct cognate, correct).
- Avoid associating it with 'волокно' (fibre) in a non-medical sense.
- Do not translate as 'мерцание' (flickering) in non-cardiac technical contexts, though 'мерцательная аритмия' is the standard term for atrial fibrillation.
Common Mistakes
- Misspelling as 'fibrilation' (missing one 'l').
- Using it to describe a fast but regular heartbeat (which is tachycardia).
- Pronouncing the first syllable as 'fibre' (/ˈfaɪ.bə/) in American English (where it is /ˌfɪb.rə/).
Practice
Quiz
In which context is the term 'fibrillation' most precisely and commonly used?
FAQ
Frequently Asked Questions
No. A heart attack is damage to heart muscle due to blocked blood flow. Fibrillation is a type of dangerous irregular heartbeat (arrhythmia) that can occur during or cause complications from a heart attack.
Yes, the term can be used in medicine to describe unsynchronised contractions of individual muscle fibres, often seen in denervated muscle or under certain experimental conditions, but it is vastly most common in reference to the heart.
Both are types of atrial tachycardia. Flutter is typically more organised and regular, with a sawtooth pattern on an ECG. Fibrillation is completely chaotic and irregular. Flutter can sometimes degenerate into fibrillation.
To 'fibrillate'. For example: 'The heart chamber began to fibrillate.' The related adjective is 'fibrillatory'.