Modified Valsalva test differentiates primary from secondary cough headache.

Area of Science:

• Neurology
• Neuroscience
• Diagnostic Medicine

Background:

• Cough headache is typically defined by Valsalva maneuver provocation, assumed to be due to increased intracranial pressure.
• This study questions the universal applicability of this assumption and explores the Valsalva test's utility in differentiating primary and secondary cough headache.

Purpose of the Study:

• To investigate the efficacy of a modified Valsalva test in distinguishing between primary and secondary cough headache.
• To explore the underlying mechanisms of different cough headache types.

Main Methods:

• Sixteen consecutive patients with cough headache underwent a modified Valsalva test.
• Brain MRI was performed on all patients to identify structural abnormalities.
• A positive Valsalva test was defined as headache provocation during the maneuver.

Main Results:

• Eleven patients had a positive modified Valsalva test, with ten diagnosed with posterior fossa pathologies (Chiari Type 1, meningiomas).
• Surgery relieved cough headache in all patients with confirmed posterior fossa pathologies.
• Five patients with negative or equivocal Valsalva tests and normal MRI were classified with primary cough headache.

Conclusions:

• The modified Valsalva test can differentiate secondary cough headache, often linked to cerebrospinal fluid dynamic obstructions, from primary cough headache.
• Findings suggest primary cough headache may involve venous congestion and trigeminal nerve sensitivity, distinct from secondary causes.
• The Valsalva test can help determine if tonsillar herniation on MRI is symptomatic.