Long Term Antihypertensive Exposure and Adverse Metabolic Effects: PEAR Follow-Up Study
This is a research study of the long term effects on blood sugar and cholesterol of blood pressure lowering medications. People are invited to participate in this research study if they participated in the Pharmacogenomic Evaluation of Antihypertensive Responses (PEAR) study and are still taking a thiazide diuretic. In PEAR, the effects on blood pressure, blood sugar, and cholesterol of the high blood pressure drugs hydrochlorothiazide and atenolol over an 18 week period were evaluated. This PEAR follow-up study will determine the effects of thiazide diuretics on blood sugar and cholesterol, but in the period since the PEAR trial. The study hypothesis is that long term exposure to thiazide diuretics results in larger increases in blood sugar and cholesterol levels than short term exposure.
Thiazide Induced Dysglycemia
Thiazide Induced Dyslipidemia
Drug: Oral Glucose Tolerance Test
|Study Design:||Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
|Official Title:||Long Term Antihypertensive Exposure and Adverse Metabolic Effects: PEAR Follow-Up Study|
- Fasting Glucose (mg/dL) [ Time Frame: For the duration of the single study visit (expected average of 3 hours) ] [ Designated as safety issue: No ]
- Oral Glucose Tolerance Test [ Time Frame: For the duration of the single study visit (expected average of 3 hours) ] [ Designated as safety issue: No ]
- Triglycerides (mg/dL) [ Time Frame: For the duration of the single study visit (expected average of 3 hours) ] [ Designated as safety issue: No ]
- Low Density Lipoprotein (mg/dL) [ Time Frame: For the duration of the single study visit (expected average of 3 hours) ] [ Designated as safety issue: No ]
- High Density Lipoprotein (mg/dL) [ Time Frame: For the duration of the single study visit (expected average of 3 hours) ] [ Designated as safety issue: No ]
|Study Start Date:||June 2010|
|Study Completion Date:||August 2013|
|Primary Completion Date:||August 2013 (Final data collection date for primary outcome measure)|
All patients are recruited for inclusion in the Follow-Up Arm, which is the sole arm of the study. The Follow-Up Arm includes a one time study visit in which study interventions are performed.
Drug: Oral Glucose Tolerance Test
Administration of 75 gram oral glucose load and three plasma glucose measurements (including baseline).
One in three deaths in the United States is due to cardiovascular (CV) disease. One in three US adults has hypertension, a major underlying cause of CV disease. Type 2 diabetes (T2D) and dyslipidemia are major contributors of CV morbidity and mortality among hypertensive patients. Thiazide diuretics and beta blockers are first line agents in the treatment of hypertension, but these commonly prescribed antihypertensive classes can contribute to dysfunction of glucose and lipid metabolism. In randomized controlled trials, reductions in CV outcomes due to blood pressure reduction with thiazide diuretic and beta blocker treatment are accompanied by increases in T2D incidence and exacerbation of dyslipidemia. CV morbidity and mortality resulting from persistent antihypertensive-related T2D or dyslipidemia may eventually outweigh benefits from blood pressure reduction, encouraging use of alternate antihypertensive classes especially in high risk patients. An accumulating body of published literature supports that adverse metabolic effects are induced by thiazide diuretics and beta blockers. However, the vast majority of evidence for adverse metabolic effects of antihypertensive drugs utilizes secondary analyses of data from randomized blood pressure reduction trials. To date, no published study has compared short and long term adverse metabolic effects of antihypertensive therapy in the same patient population. The Pharmacogenomic Evaluation of Antihypertensive Responses (PEAR) study is a randomized, parallel assignment trial to determine genetic influences on blood pressure response to the thiazide diuretic hydrochlorothiazide and the beta blocker atenolol. The PEAR study duration (18 weeks) is not sufficient to assess long term effects (over six months) of these antihypertensive medications. The primary aim of this study is to determine the effects of long term thiazide and beta blocker therapy on glucose and lipid metabolism in the PEAR population, in which short term effects have been assessed. Secondary analyses of this follow-up study include investigating adverse metabolic effects of long term thiazide diuretic and beta blocker therapy on insulin sensitivity and the role of potassium and uric acid in the hyperglycemic effects of thiazide diuretics.
|United States, Florida|
|University of Florida College of Pharmacy|
|Gainesville, Florida, United States, 32610|
|Principal Investigator:||Rhonda M Cooper-DeHoff, PharmD, MS||University of Florida|
|Study Director:||Jason H Karnes, PharmD||University of Florida|