extrasystole
/ˌɛkstrəˈsɪstəli/
noun
- An extra or early heartbeat that occurs outside the normal rhythm, often felt as a skipped beat or a flutter.
- The heart monitor recorded an extrasystole during the patient's stress test.
- The doctor explained that an occasional extrasystole is usually harmless.
- After drinking too much coffee, he felt an extrasystole and became worried.