Circulating Troponin I Level in Patients with Acute Ischemic Stroke

Area of Science:

• Cardiology
• Neurology
• Biomarkers

Background:

• Cardiac troponin levels are key indicators of acute coronary events.
• Elevated troponin can occur in acute ischemic stroke, even without direct cardiac injury.
• Understanding troponin elevation in stroke is crucial for differential diagnosis.

Purpose of the Study:

• To determine the maximum elevation of circulating troponin I in patients with acute ischemic stroke.
• To differentiate troponin elevations caused by stroke versus concurrent cardiac events.

Main Methods:

• Retrospective review of 1226 acute ischemic stroke patients from Vanderbilt University Medical Center.
• Inclusion criteria excluded patients with known cardiac disease, renal impairment, or sepsis.
• Systematic literature review on troponin I levels in ischemic stroke.

Main Results:

• 20.6% of included stroke patients had elevated troponin I levels.
• 99% of these elevations were below 2.13 ng/mL, significantly lower than in acute coronary syndrome.
• Systematic review confirmed troponin I rarely exceeds 2 ng/mL in ischemic stroke.

Conclusions:

• Troponin I elevation in acute ischemic stroke is common but typically modest.
• Troponin I levels above 2 ng/mL in stroke patients should prompt evaluation for coronary artery disease.
• Shared risk factors necessitate vigilance for comorbid cardiac conditions in stroke patients.