Trigger Factors for Spontaneous Intracerebral Hemorrhage: A Case-Crossover Study

Area of Science:

• Neurology
• Vascular Medicine
• Epidemiology

Background:

• The triggers for spontaneous intracerebral hemorrhage (ICH) are not fully understood.
• Identifying these triggers is crucial for understanding ICH pathophysiology and preventing vessel rupture.
• This study investigated potential activities and conditions that may precipitate ICH events.

Purpose of the Study:

• To assess the risk of various activities and conditions acting as triggers for intracerebral hemorrhage (ICH).
• To gain insights into the pathophysiology of vessel rupture leading to ICH.
• To identify specific factors that increase the likelihood of ICH onset.

Main Methods:

• A case-crossover design was employed, including 149 patients diagnosed with ICH between 2013 and 2019.
• Patients reported exposure to 12 potential trigger factors in the period preceding ICH onset and their usual exposure over the prior year.
• Relative risks (RR) were calculated to quantify the association between trigger factors and ICH onset.

Main Results:

• Significant increases in ICH risk were observed within an hour after coffee consumption (RR=4.8), lifting >25 kg (RR=6.6), minor head trauma (RR=10.1), sexual activity (RR=30.4), straining for defecation (RR=37.6), and vigorous exercise (RR=21.8).
• A substantial increase in ICH risk was noted within 24 hours following flu-like illness or fever (RR=50.7).
• Valsalva maneuvers showed an increased risk for deep ICH (RR=3.5) but not significantly for lobar ICH (RR=2.0).

Conclusions:

• The study identified specific activities and infections as significant triggers for intracerebral hemorrhage (ICH).
• Findings highlight the role of factors like coffee consumption, physical exertion, straining, and infections in precipitating ICH.
• These results provide novel insights into the pathophysiology of vessel rupture in ICH.