Treatment of Vasovagal Syncope Triggered by Coughing

Understanding Cough Syncope

Cough syncope is classified as "situational syncope," a specific subtype of neurally-mediated reflex syncope that occurs during or immediately after coughing, triggered by the mechanical act of coughing that leads to vasodilation and/or bradycardia, resulting in systemic hypotension and cerebral hypoperfusion, according to the European Heart Journal 2.

The cornerstone of treating cough syncope is directly addressing the trigger factor—suppressing the cause of the cough, which distinguishes cough syncope from other forms of vasovagal syncope where trigger elimination may not be as straightforward, as recommended by the European Heart Journal 1.
Evaluate and treat underlying conditions such as chronic bronchitis or COPD exacerbations 2, asthma 1, post-nasal drip or upper airway cough syndrome 2, gastroesophageal reflux disease 2, medication-induced cough (ACE inhibitors) 1, and pertussis or other respiratory infections 1.

Explain that vasovagal syncope is not life-threatening and has a benign prognosis, and teach recognition of premonitory symptoms (lightheadedness, nausea, warmth, visual changes) to identify impending episodes, as suggested by the European Heart Journal 1 and Praxis Medical Insights 4.
Instruct on immediate supine positioning when prodromal symptoms occur, as recommended by the European Heart Journal 1.
Teach physical counterpressure maneuvers, such as leg crossing with muscle tensing 5, squatting 5, and isometric arm contraction or handgrip 4, which can abort an episode if performed during the prodrome, according to Praxis Medical Insights 4 and 5.

Increase dietary salt and fluid intake (2-2.5 liters per day) unless contraindicated by hypertension, heart failure, or renal disease, as suggested by Praxis Medical Insights 4 and 5.
Use salt tablets or sport drinks as volume expanders, as recommended by the European Heart Journal 1 and Praxis Medical Insights 4.

Midodrine is the only medication with consistent evidence of efficacy and should be the first-line pharmacological agent if non-pharmacological measures fail, reducing syncope recurrence by 43%, according to Praxis Medical Insights 5.
Fludrocortisone (0.1-0.2 mg daily) may be considered only after midodrine fails, particularly in young patients with low-normal blood pressure, as suggested by Praxis Medical Insights 4 and 5.

Do not overtreat patients with infrequent episodes, as recommended by Praxis Medical Insights 4.
Review and discontinue or reduce chronic vasodilator therapy (antihypertensives, nitrates) that may enhance susceptibility to vasovagal syncope, as suggested by the European Heart Journal 1.
Avoid routine neurological investigations unless loss of consciousness cannot be attributed to syncope or autonomic failure is suspected, according to the European Heart Journal 2 and 3.
Monitor for supine/nocturnal hypertension when implementing volume expansion strategies, as recommended by Praxis Medical Insights 4.