Isolated Pulmonary Edema without Myocardial Stunning in Brainstem Strokes.

Area of Science:

• Neurology
• Cardiology
• Pulmonology

Background:

• Ischemic stroke is linked to myocardial stunning and neurogenic pulmonary edema (NPE).
• The specific risk of pulmonary edema from brainstem strokes, independent of cardiac effects, requires further investigation.

Purpose of the Study:

• To determine if large vessel ischemic strokes in the brainstem are associated with pulmonary edema independently of myocardial stunning.
• To investigate the association between stroke location and pulmonary edema, cardiac abnormalities, QTc-interval prolongation, and elevated serum troponin.

Main Methods:

• Retrospective case-control study of 1,278 patients.
• Identified 210 patients with large vessel ischemic stroke or transient ischemic attack.
• Used multivariate logistic regression to analyze the impact of stroke location on outcomes, controlling for patient characteristics.

Main Results:

• Large vessel brainstem stroke showed a strong association with pulmonary edema (adjusted OR 29.23) but not cardiac abnormalities.
• Large vessel left middle cerebral artery stroke was linked to pulmonary edema and QTc-interval prolongation.
• Large vessel right middle cerebral artery stroke was associated with pulmonary edema and elevated serum troponin.

Conclusions:

• Large vessel brainstem stroke is independently associated with pulmonary edema, suggesting a direct brainstem-to-lung mechanism.
• This brainstem-induced pulmonary edema occurs separately from myocardial stunning.
• Findings indicate a distinct pathophysiological pathway for pulmonary edema in brainstem stroke patients.