The European Society of Cardiology (ESC) guidelines on syncope say that the challenge for doctors is to identify the small number of patients in whom syncope is caused by a potentially life-threatening heart problem. ESC also recommends that intermediate or high risk patients should be evaluated in the emergency department or an outpatient syncope clinic. These guidelines were released in March 2018.
Syncope has been defined in the guidelines as “transient loss of consciousness (TLOC) due to cerebral hypoperfusion, characterized by a rapid onset, short duration, and spontaneous complete recovery”.
TLOC has been defined as “a state of real or apparent LOC with loss of awareness, characterized by amnesia for the period of unconsciousness, abnormal motor control, loss of responsiveness, and a short duration”.
The initial evaluation of syncope should answer four key questions.
- Was the
- In it
is a TLOC, is it syncopal or non-syncopal?
- In case
of suspected syncope, is there a clear etiological diagnosis?
there evidence to suggest a high risk of cardiovascular events or death?
The initial diagnostic evaluation should comprise of careful history taking, physical examination (BP, both supine and standing) and standard ECG. The findings from the initial evaluation will direct further diagnostic evaluation via echocardiography, immediate ECG monitoring, head-up tilt testing, carotid sinus massage, electrophysiology studies.
Blood tests should be performed when clinically indicated such as,
or hemoglobin when hemorrhage is suspected
saturation and blood gas analysis when hypoxia is suspected
when cardiac ischemia-related syncope is suspected
when pulmonary embolism is suspected
Management depends on evaluation of the patient in the emergency department, which should address the following questions:
there a serious underlying cause that can be identified?
- If the
cause is uncertain, what is the risk of a serious outcome?
the patient be hospitalized?
High risk patients are more likely to have cardiac syncope and need urgent hospital admission and comprehensive evaluation. Whereas, syncope in low risk patients is likely to be reflex, situational, or orthostatic; hence, they do not need further evaluation.
The guideline also recommends that friends and relatives use their smartphones to film the attack and recovery.
The following treatments are recommended based on the clinical severity:
regarding lifestyle maneuvers
hydration and salt intake
of hypotensive therapy
binders and/or support stockings
An implantable cardioverter-defibrillator (ICD) should be considered in patients with unexplained syncope at high risk of sudden cardiac death.
(Source: ESC Press release, Eur Heart J. 2018 Jun 1;39(21):1883-1948)
Dr KK Aggarwal
Padma Shri Awardee
President Elect Confederation of Medical Associations in Asia and Oceania (CMAAO)
Group Editor-in-Chief IJCP Publications
President Heart Care Foundation of India
Past National President IMA