Mitigation of calcium channel blocker-related oedema in hypertension by antagonists of the renin-angiotensin system.

This review is aimed at examining calcium channel blocker (CCB)-related oedema and how this can be attenuated through the use of agents that inhibit the renin-angiotensin system. CCBs are effective antihypertensive agents, but their propensity for causing oedema may reduce compliance. A review of the literature has indicated that the absolute incidence of this side effect is difficult to determine because reported rates vary widely, a factor that may stem from differences in the surveillance technique (active vs passive). In a recent trial incorporating active surveillance, 25% of patients who received amlodipine 10 mg per day experienced oedema. CCB-induced oedema is caused by increased capillary hydrostatic pressure that results from preferential dilation of pre-capillary vessels. Angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin receptor blockers (ARBs) cause post-capillary dilation and normalize hydrostatic pressure, and are thus ideally suited for prevention/reversal of CCB-induced oedema. The efficacy of this strategy was proven using both subjective and objective techniques. ARB/CCB and ACEI/CCB combination therapy is also more effective than CCB monotherapy in controlling blood pressure. These combinations represent an important advance in the management of hypertension.