Hypertensive crisis

A hypertensive crisis is a sudden and severe increase in blood pressure that can damage important organs like the heart, brain, and kidneys. It involves the cardiovascular system and can cause symptoms such as severe headache, chest pain, shortness of breath, or confusion. This condition is dangerous because the extremely high blood pressure can lead to life-threatening complications like heart attack, stroke, or kidney failure. The body’s blood vessels and organs are stressed by the excessive pressure, which can cause swelling or bleeding. Immediate medical attention is often needed to prevent permanent damage. The main concern is controlling the blood pressure quickly but safely to protect vital organs.

Hypertensive crisis is defined as a rapid and marked elevation in blood pressure, typically with systolic pressure above 180 mm Hg or diastolic pressure above 120 mm Hg. It is caused by a sudden failure of the body's normal blood pressure regulation mechanisms, often due to uncontrolled chronic hypertension, medication noncompliance, or secondary causes like renal artery stenosis or pheochromocytoma. The condition is classified into hypertensive urgency (severe elevation without acute target organ damage) and hypertensive emergency (severe elevation with evidence of acute target organ injury such as encephalopathy, myocardial ischemia, or acute kidney injury). The pathophysiology involves endothelial injury, activation of the renin-angiotensin-aldosterone system, and increased systemic vascular resistance. This leads to a vicious cycle of vascular damage and further blood pressure elevation. Prompt recognition and management are critical to prevent irreversible organ damage and death.