Hypertension, or persistently high blood pressure, remains a major cardiovascular risk factor across Nigerian communities, often leading to stroke, renal failure, and heart failure if left uncontrolled. Antihypertensive therapy aims to reduce systemic vascular resistance and cardiac output to protect target organs. Treatment typically begins with lifestyle modifications—such as dietary salt restriction and regular exercise—before progressing to pharmacotherapy. Nurses play a critical role in baseline blood pressure assessment, identifying secondary causes, and monitoring patient compliance with long-term drug regimens.
Diuretics lower blood pressure by promoting renal sodium and water excretion, thereby reducing blood volume.
Nurses must monitor serum electrolytes, counsel patients to take doses in the morning to prevent nocturnal enuresis, and watch for orthostatic hypotension.
Sympatholytics blunt the sympathetic nervous system's effects on the cardiovascular system.
Careful monitoring is required for bradycardia with beta-blockers, first-dose syncope with alpha-blockers, and rebound hypertension if central agents are abruptly stopped.
The RAAS cascade is a powerful hormonal regulator of blood pressure and fluid balance. Inhibiting this system provides profound cardiovascular and renal protection, especially in diabetic patients.
| Drug Class | Mechanism of Action | Common Example |
|---|---|---|
| ACE Inhibitors | Block conversion of angiotensin I to angiotensin II | Lisinopril |
| ARBs | Block angiotensin II receptors directly | Losartan |
| Direct Renin Inhibitors | Inhibit renin activity at the start of the pathway | Aliskiren |
A persistent dry cough is a well-known side effect unique to ACE inhibitors due to bradykinin accumulation. Additionally, all RAAS inhibitors carry a risk of hyperkalemia and must be used with caution alongside potassium supplements.
Calcium channel blockers inhibit the influx of calcium ions into vascular smooth muscle and myocardial cells, leading to coronary and peripheral vasodilation.
Nurses should assess for lower limb swelling and monitor heart rate before administering non-dihydropyridine agents.
Hypertensive crises are divided into emergencies, where extremely high blood pressure causes acute target organ damage (such as encephalopathy, myocardial infarction, or aortic dissection), and urgencies, where pressure is severely elevated without acute organ damage.
Emergencies require immediate admission to an intensive care unit and intravenous antihypertensives like hydralazine or labetalol to lower blood pressure gradually. Dropping the pressure too fast can precipitate cerebral ischemia. Urgencies are managed with oral medications over 24 to 48 hours in an outpatient or ward setting.
Long-term management of hypertension relies heavily on patient adherence, which is often challenging because hypertension is largely asymptomatic. Nurses must provide clear education regarding lifestyle changes, potential side effects, and the danger of stopping medication abruptly, which can cause rebound hypertension. Regular blood pressure logging, proper technique for home monitors, and consistent follow-up visits are essential components of safe, effective nursing care in community and hospital settings.