Ischemia-Induced Hypertension

Pathophysiological Mechanisms and Clinical Implications

• During acute ischemic stroke, elevated blood pressure is extremely common, occurring in up to 80% of patients, with systolic blood pressure >139 mmHg in 77% and >184 mmHg in 15% of patients on arrival at the emergency department, according to the American Heart Association 1, 2
• In acute ischemic stroke, blood pressure typically rises as a physiological response to maintain cerebral perfusion of the ischemic tissue, especially in patients with pre-existing hypertension, as noted by the American Heart Association 1, 2
• The relationship between admission blood pressure and clinical outcomes in acute ischemic stroke shows a U-shaped curve, with optimal systolic blood pressure ranging from 121 to 200 mmHg and diastolic blood pressure from 81 to 110 mmHg, as reported by the American Heart Association 1, 2
• In patients with acute ischemic stroke, current guidelines from the American College of Cardiology recommend against initiating or reinitiating antihypertensive treatment within the first 48-72 hours if blood pressure is less than 220/120 mmHg and the patient did not receive thrombolysis or endovascular treatment 3, 4
• For patients with blood pressure ≥220/120 mmHg who did not receive thrombolysis or endovascular treatment, it might be reasonable to lower blood pressure by 15% during the first 24 hours after stroke onset, according to the American College of Cardiology 3, 4
• Failing to recognize that ischemia-induced hypertension may require different management approaches depending on the affected organ system (brain, heart, kidney) can lead to adverse outcomes, as highlighted by the American Heart Association 1, 2
• Understanding that the Law of Laplace plays a role in ischemic conditions, as wall tension is directly proportional to pressure and radius, and inversely proportional to vessel wall thickness, affecting both the development of hypertension and its consequences, is crucial for effective management, as noted in a medical journal 5