The association between pulmonary hypertension and stroke: A systematic review and meta-analysis.

BACKGROUND: Pulmonary hypertension is associated with atrial fibrillation and paradoxical embolism. Yet, the association between pulmonary hypertension and stroke has not been well studied.

METHODS: We reviewed Medline and Embase from inception to December 1, 2018, to identify observational studies reporting prevalence of stroke in adult patients with pulmonary hypertension. We sought studies that included patients with pulmonary hypertension secondary to any etiology except left heart failure, and excluded studies that reported rates of perioperative stroke. We conducted random effects meta-analyses to obtain pooled prevalence of stroke in patients with pulmonary hypertension, and pooled unadjusted odds ratio of stroke in patients with pulmonary hypertension compared to those without.

RESULTS: We included 14 studies including 32,523 participants of which 2976 (9.2%) had pulmonary hypertension, and 727 (2.2%) had a stroke. The pooled prevalence of stroke in patients with pulmonary hypertension was 8.0% [95% confidence interval (CI), 5.1%-10.9%, I2 91.9]. The pooled unadjusted odds ratio of stroke in patients with pulmonary hypertension compared to those without was 1.46 (95% CI, 1.07-1.99, I2 55.6, n = 7 studies).

CONCLUSION: Stroke is a major non-cardiac morbidity in patients with pulmonary hypertension, requiring further evaluation to determine its etiology, and measures to reduce its risk.