Palpitation is an awareness of the heartbeat. Although benign in the vast majority, palpitations are occasionally a manifestation of a life-threatening disorder.

Causes

Sinus tachycardia

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    Anxiety/emotional stress

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    Caffeine

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    Nicotine

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    Alcohol

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    Infection

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    Hyperthyroidism

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    Electrolyte disturbances

Cardiac arrhythmia

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    Premature ventricular contractions (ventricular ectopic beats) *

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    Premature atrial contractions (atrial ectopic beats) *

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    Atrial fibrillation * ( Fig. 47 )

    Figure 47, ECG of atrial fibrillation .

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    Supraventricular tachycardia (AVRT, AVNRT)

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    Ventricular tachycardia (long QT syndrome)

* Indicates causes that tend to present as irregular palpitations.

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