22.4: Hypertension IV: Drug Therapy and Lifestyle Modifications

Multiple classes of antihypertensive medications are employed in treating hypertension. The most commonly recommended first-line treatments include:

• Thiazide Diuretics, such as chlorthalidone, increase sodium and water excretion from the body, reducing blood volume and blood pressure.
• Angiotensin-converting enzyme inhibitors, like lisinopril, block the conversion of angiotensin I to II, a potent vasoconstrictor lowering blood pressure.
• Angiotensin II Receptor Blockers (ARBs) prevent angiotensin II from binding to its receptor, leading to vasodilation and a decrease in blood pressure. An example is losartan.
• Calcium Channel Blockers limit calcium entry into vascular smooth muscle and cardiac cells, resulting in vasodilation and a lowered heart rate. Amlodipine is one such example.

Second-Line Antihypertensive Agents

Second-line agents are used when first-line medications are not well-tolerated, contraindicated, or ineffective at achieving blood pressure targets. They can also complement first-line therapy in a combination treatment plan to more effectively control blood pressure. Common second-line agents include:

• Beta Blockers reduce heart rate and myocardial contractility by blocking beta-adrenergic receptors. Commonly prescribed examples include metoprolol, atenolol, and propranolol.
• Alpha Blockers reduce vascular resistance by blocking alpha-1 adrenergic receptors. Example: doxazosin.
• Direct Renin Inhibitors hinder the action of renin, the first step in the angiotensin system that regulates blood pressure, such as aliskiren.
• Aldosterone Antagonists impede the action of aldosterone to decrease sodium retention and blood pressure, as exemplified by spironolactone.

Patients typically start with low doses of medication, which are incrementally increased if blood pressure remains uncontrolled. Additional medications may be introduced as needed. Follow-up visits for dosage adjustments are recommended monthly until the target blood pressure is achieved. Once blood pressure stabilizes at the goal level, follow-up intervals can generally extend to 3 to 6 months. The presence of comorbidities, associated diseases, and the need for ongoing monitoring dictate the frequency of these visits.

Managing Hypertension

Effectively managing hypertension often requires a comprehensive approach that includes pharmacological management and lifestyle modifications to reduce blood pressure (BP) and the overall risk of cardiovascular diseases (CVD). Key lifestyle modification measures for patients with hypertension include:

• Monitoring Blood Pressure: Regularly checking BP is crucial for effective management.
• Cholesterol Control: Maintaining healthy cholesterol levels is vital for heart health.
• Blood Glucose Regulation: Keeping blood sugar levels within recommended ranges can prevent complications.
• Physical Activity: Based on individual condition, engaging in 150-175 minutes of moderate to vigorous weekly exercise is recommended.
• Healthy Eating: Adopting diets rich in fruits, vegetables, legumes, and lean proteins, such as the plant-based or Mediterranean diet, can help manage BP. Dietary Approaches to Stop Hypertension also significantly decrease BP.
• Weight Management: Losing weight can profoundly affect lowering BP. A general guideline is that BP can decrease by 1 mm Hg for every kilogram of weight lost.
• Smoking Cessation: Avoiding tobacco products is crucial, as nicotine can raise BP by causing vasoconstriction.
• Moderate Alcohol Intake: Limiting alcohol consumption to no more than two drinks per day for men and one drink per day for women is advised.
• Sodium Restriction: Reducing sodium intake to less than 2300 mg/day, and even lower to 1500 mg for specific populations, can help manage hypertension.
• Avoiding Excessive Caffeine: High caffeine intake can increase BP.
• Stress Management: Learning to handle stress through relaxation techniques or other methods can positively affect BP.

Additionally, it is essential to educate patients about reading food labels to make informed choices, especially concerning the sodium content in processed and prepared foods. Patients should also be encouraged to integrate sustainable lifestyle modifications into daily routines.