Red Flags of Syncope

Red Flags of Syncope

Cardiac syncope may lead to a high mortality rate of approximately 10% at 1 year and is, therefore, vital to identify potentially life-threatening cardiac causes1.

Below are considered reds flags for urgent referral to a Cardiologist:

  • Persistent bradycardia- heart rates < 60 bpm
  • Abnormal structural heart conditions, (presence of a cardiac murmur)
  • Decreased left ventricular ejection fractions < 35%
  • Long QT syndrome
  • Brugada syndrome
  • Ventricular pre-excitation conditions (such as Wolf-Parkinson-White syndrome)
  • Pathological q waves
  • Sustained atrial arrhythmias
  • Ventricular arrhythmias
  • Syncope whilst exercising
  • Syncope whilst supine
  • Sudden cardiac death in family < 40 years old
    > 65 years old, with syncope in absence of prodrome2.

“If a patient has an episode of syncope with physical exertion, that is always abnormal.” Electrophysiologist, Dr John Meulet comments on the significance of syncope as evidence of an underlying heart condition. Watch the video below to learn more:



Learn more about the diagnosis of syncope here.


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