Clinical recognition of neurally mediated syncope

Area of Science:

• Cardiology
• Neurology
• Clinical Medicine

Background:

• Syncope is commonly caused by hypotension, with vasovagal response being the most frequent mechanism.
• Neurally mediated syncope (NMS) is a vasovagal response triggered by physical or psychological stressors in susceptible individuals.
• Clinical recognition of NMS remains poor despite the availability of tilt table testing (TTT).

Purpose of the Study:

• To evaluate the clinical presentation of patients with NMS and pre-syncope confirmed by TTT.
• To compare these patients with those experiencing syncope with a low probability of NMS.

Main Methods:

• Prospective evaluation using questionnaires during TTT.
• Documentation of symptoms, signs, and provoking factors in consecutive patients.
• Statistical analysis using chi-squared tests and logistic regression.

Main Results:

• NMS patients more frequently presented with both syncope and prolonged pre-syncope.
• Specific stress factors, often multiple, were more common triggers in NMS.
• NMS patients typically had a hypotensive prodrome, unlike control patients who often experienced syncope without warning.

Conclusions:

• NMS patients exhibit stereotypical situational syncope with common features among individuals.
• A detailed patient history can establish a diagnostic pattern for NMS.
• This history-taking approach may reduce the need for extensive investigations, potentially obviating TTT in younger patients.