10 Palpitations
Salient features
History
• How old are you? Supraventricular tachycardias (SVT), particularly ones that use a bypass tract (atrioventricular re-entry tachycardia) may be experienced in earlier life. Atrial fibrillation, flutter, atrial tachycardia and ventricular tachycardia (VT) tend to occur later in life associated with structural heart disease.
• Are the palpitations regular or irregular? Patients should be asked to tap out the rhythm or choose from cadences tapped by the clinician. (Rapid regular rhythms suggest SVT or VT whereas rapid, irregular rhythms suggest atrial fibrillation, atrial flutter or tachycardia with varying block.)
• Is the onset abrupt (paroxysmal tachyarrhythmias)?
• How frequent are the palpitations?
• Do you have palpitations at work? (More likely to be a cardiac arrhythmia.)
• Do the palpitations start on sleeping or on termination of exercise? (Both these are states of increased vagal tone suggesting vagally mediated atrial fibrillation or certain subtypes of long-QT syndrome.)
• What is the duration of each episode? (palpitations lasting <5 min makes the diagnosis of cardiac arrhythmia slightly less likely) (JAMA 2009;302:2135–43).
• Is there accompanying pounding sensation in the neck? (The presence of regular rapid pounding sensation in the neck or visible neck pulsations increases the likelihood of atrioventricular nodal re-entry tachycardia when contraction of the atria against closed atrioventricular valves produces increased right atrial pressures and reflux of blood into the inferior vena cava.)
• Is each episode followed by polyuria? (Seen in supraventricular tachycardia.)
• Is there any relation to exercise? (For example, polymorphic VT in long-QT syndrome.)
• What happens on standing? (Postural hypotension, atrioventricular nodal tachycardia.)
• Are there any precipitating factors such as coffee, tea, alcohol or medications such as thyroid extract, ephedrine, aminophylline, monoamino oxidase inhibitors?
• Are there any associated symptoms such as chest pain or shortness of breath?
