White Matter Stroke Masquerading as Subarachnoid Hemorrhage After High-Risk Percutaneous Coronary Intervention: A Case Report.

Considering the context of percutaneous coronary artery angiography (PCI), stroke is a rare but severe complication and is associated with high morbidity and mortality. A computed tomography (CT) scan of the brain is an indispensable imaging modality to diagnose ischemic stroke changes following PCI. A 75-year-old female who presented with sudden onset chest pain was diagnosed with anterior-wall myocardial infarction which required primary PCI. However, an hour following the procedure, she suddenly developed drowsiness, confusion, and hemiparesis. Non-contrast CT showed hyperdense signals in posterior falx and tentorium cerebelli suggesting subarachnoid hemorrhage (SAH) as well as low attenuation signals in bilateral periventricular region suggestive of microvascular ischemic changes. It was critical to decide about the continuation of dual antiplatelet therapy (DAPT), aspirin and P2Y12 inhibitor, as soon as possible. Based on the clinical presentation and mixed picture on the CT scan, a second opinion was sought by a multidisciplinary team, which concluded that the findings were consistent with white matter stroke and DAPT was resumed. The hemiparesis improved gradually with the reversal of CT scan findings. There is a lack of reported literature about ischemic stroke and SAH following high-risk PCI and what should be the best approach in ambiguous cases. The management of white matter stroke and SAH is contrasting, particularly in deciding whether to continue the DAPT after PCI; hence it is critical to diagnose them promptly. Thus, this case highlights the importance of differentiating SAH from white matter stroke for prompt treatment of post-PCI complications to ensure positive outcomes.