Antihypertensive therapy
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Antihypertensive Therapy: Drug Classes, Mechanisms, and Selection
Antihypertensive therapy is widely used to reduce long-term mortality from chronic hypertension and to improve survival in conditions like heart failure and coronary artery disease, sometimes independent of blood pressure reduction. There are several classes of antihypertensive drugs, each with unique mechanisms, side effects, and pharmacological characteristics. These include ACE inhibitors, angiotensin II receptor blockers (sartans), calcium channel blockers, beta-blockers, and diuretics, as well as less commonly used classes like renin inhibitors, alpha-blockers, centrally acting agents, and direct vasodilators. Not all drugs within the same class have identical effects, so careful selection based on individual patient comorbidities is recommended for optimal outcomes 134.
Guideline Recommendations and Real-World Practice
Recent international guidelines, such as those from the ESC/ESH and ISH, recommend starting most patients on combination therapy using two antihypertensive agents in a single-pill combination (SPC) to achieve better blood pressure control. However, some guidelines, like the Japanese, suggest a more individualized approach, considering combination therapy when a significant blood pressure reduction is needed, but not mandating it for all. The choice of therapy should consider drug mechanisms, duration of action, and patient tolerability, with a focus on titrating to the highest effective dose without adverse effects and including a thiazide diuretic when appropriate. Real-world data show that, in practice, antihypertensive therapy generally follows guideline recommendations well, especially in patients with serious cardiovascular conditions 28.
Efficacy, Adherence, and Outcomes
Adherence to antihypertensive therapy is crucial for reducing both total and cardiovascular mortality, especially in older and frail patients. High adherence to medication is associated with significantly lower mortality, even among those with poor clinical status. The benefits of adherence are seen across different populations and are independent of blood pressure control in some studies, suggesting that adherence may also reflect healthier behaviors overall. Poor adherence, particularly in low-income groups, is linked to higher mortality risk .
Cost, Pharmacoeconomics, and Sustainability
There are notable differences in the cost of antihypertensive therapy both within and between drug classes. These cost differences can impact prescribing trends and the sustainability of therapy, especially in large populations. Pharmacoeconomic considerations are important for ensuring that effective therapy is accessible and sustainable in healthcare systems .
Special Considerations: Discontinuation, Resistance, and Dosing Timing
In some patients with well-controlled blood pressure and no cardiovascular organ damage, it may be possible to safely discontinue antihypertensive therapy, particularly if home blood pressure monitoring (HBPM) confirms control. About one-third of such patients can maintain normal blood pressure for a year after stopping therapy, with HBPM being a useful tool to guide this decision .
Resistance to antihypertensive therapy can occur, and it is important to distinguish true resistant hypertension from pseudo-resistance, which may be due to factors like poor adherence or suboptimal drug combinations .
Regarding the timing of medication, while some evidence suggests that bedtime dosing may offer benefits for certain patients, current consensus is that routine bedtime dosing should not be recommended until more robust data are available. The primary goal should be 24-hour blood pressure control using long-acting medications, typically administered in the morning .
Additional Effects: Immunomodulation
Antihypertensive drugs may also have immunomodulatory effects due to their action on receptors present on immune cells. These effects could influence both blood pressure and immune function, though more research is needed to fully understand their clinical significance .
Conclusion
Antihypertensive therapy is a cornerstone of cardiovascular risk reduction, with multiple drug classes available to tailor treatment to individual patient needs. Adherence to therapy is critical for reducing mortality, and therapy should be selected based on efficacy, tolerability, cost, and patient comorbidities. Guidelines increasingly favor combination therapy, but individualized care remains important. Monitoring, especially with home blood pressure measurements, can help guide therapy adjustments and discontinuation in select patients. Ongoing research will continue to refine best practices for antihypertensive therapy.
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