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Lack of Correlation Between Thiazide‐Induced Hyperglycemia and Hypokalemia: Subgroup Analysis of Results from the Pharmacogenomic Evaluation of Antihypertensive Responses (PEAR) Study
Author(s) -
Smith Steven M.,
Anderson Shawn D.,
Wen Sheron,
Gong Yan,
Turner Stephen T.,
CooperDeHoff Rhonda M.,
Schwartz Gary L.,
Bailey Kent,
Chapman Arlene,
Hall Karen L.,
Feng Hua,
Boerwinkle Eric,
Johnson Julie A.,
Gums John G.
Publication year - 2009
Publication title -
pharmacotherapy: the journal of human pharmacology and drug therapy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.227
H-Index - 109
eISSN - 1875-9114
pISSN - 0277-0008
DOI - 10.1592/phco.29.10.1157
Subject(s) - thiazide , hypokalemia , pear , medicine , pharmacogenomics , pharmacology , subgroup analysis , endocrinology , diuretic , meta analysis , biology , botany
Study Objective . To determine whether changes in serum glucose, serum potassium, and plasma insulin levels are correlated in a cohort of hypertensive patients. Design . Prespecified subgroup analysis of results from a prospective, multicenter, randomized, open‐label, parallel‐group study. Setting . Primary care clinics at three tertiary care medical centers. Patients . Community‐based ambulatory population of 202 patients (age range 17–65 yrs) with a new diagnosis of hypertension, untreated hypertension, or known hypertension, who were previously treated with fewer than three antihypertensive drugs and had no evidence of cardiovascular disease or diabetes mellitus. Intervention . Monotherapy with oral hydrochlorothiazide 12.5 or 25 mg/day for 9 weeks. Measurements and Main Results . Fasting serum glucose, serum potassium, and plasma insulin levels were obtained at baseline (before hydrochlorothiazide therapy was started) and after 9 weeks of therapy. Significant elevations were noted in fasting serum glucose (mean ± SD 3.42 ± 10.38 mg/dl, p<0.0001) and plasma insulin (2.35 ± 9.47 μlU/ml, p<0.0001) levels, and a significant reduction in serum potassium level (0.30 ± 0.44 mEq/L, p<00.0001) was noted. No significant correlation was observed between changes in fasting serum glucose and potassium levels (r = 0.022, 95% confidence interval (CI) −0.120−0.164, p=0.757) or between changes in serum potassium and plasma insulin levels (r = −0.112, 95% CI −0.256‐0.037, p=0.140). Changes in serum glucose levels did not differ significantly between patients maintaining serum potassium levels of 4.0 mEq/L or greater and those with levels below 4.0 mEq/L. Conclusion . Changes in serum potassium and serum glucose levels were not correlated in individuals receiving hydrochlorothiazide monotherapy; thus maintenance of normal potassium levels may not attenuate the risk of thiazide diuretic‐induced hyperglycemia.