Association between Antihypertensive Medication Class and Diastolic Orthostatic Hypertension in Older Caribbean Adult Patients

In the Caribbean there is limited data on orthostatic hypertension (OHT) in elderly hypertensive patients with atherosclerotic disease who are at risk for cardiovascular events. We examined the association of antihypertensive classes of drugs with diastolic OHT in patients 60 year and older with hypertension and hyperlipidemia attending public primary care facilities. Methods: Cross-sectional study of hypertensive hyperlipidemic older patients (n=400) to determine orthostatic changes in blood pressure based on seated to standing measurements. OHT was defined as an increase in systolic blood pressure of ≥ 20mmHg and/or increase in diastolic blood pressure of ≥ 10mmHg upon orthostasis at 3 minutes. Patients were categorized based on their orthostatic blood pressure response: orthostatic normotensive (n=200) and blood pressure dysregulated (n=200) of which 168 were diastolic OHT. Multivariable logistic regression models were used to examine associations of antihypertensive classes and diastolic OHT. Results: Renin-angiotensin-aldosterone-system (RAAS) blockers were the most commonly prescribed (79.3%), followed by diuretics (DIUs) (61.6%), dihydropyridine calcium channel blockers (dCCBs) (53.8%) and beta-blockers (BBs) (19.3%). Most normotensive (76.0%) and diastolic OHT (75.0%) patients were prescribed two or more antihypertensive medications. Pharmaceutical prescription of triple combination RAAS blockers+dCCBs+DIUs (OR, 0.55; 95% CI, 0.31–0.99) or RAAS blockers+dCCBs+BBs (OR, 0.23; 95% CI, 0.06–0.92) showed a protective effect of diastolic OHT in analyses adjusted for age, gender, sitting diastolic blood pressure and comorbidities. Conclusion: Our study suggests prescription of triple combination antihypertensive drugs of RAAS blockers+dCCBs+DIUs or RAAS blockers+dCCBs+BBs may reduce the likelihood of diastolic OHT.