Abstract
To investigate the role of hyperglycemia in mediating the clinical association of NIDDM with hypertension and left ventricular dysfunction and hypertrophy. Since hyperglycemia elevates cytosolic free calcium (Cai) both in myocardial and vascular smooth muscle cells, we utilized nuclear magnetic resonance (NMR) spectroscopy to measure erythrocyte Cai levels and compared them with serum ionized calcium (Caio), glucose, and insulin values before and following an oral glucose tolerance test (OGTT) and with previously obtained cardiac structural indexes in normotensive and hypertensive NIDDM (n = 32) and normal control subjects (n = 35). Compared with control subjects, normotensive NIDDM subjects had higher Cai (31.5 +/- 2.3 vs. 24.3 +/- 1.9 nmol/l, P = 0.05), lower intracellular free magnesium (Mgi) (200 +/- 10 vs. 225 +/- 7 mumol/l, P = 0.05), and greater posterior wall thickness (0.98 +/- 0.04 vs. 0.86 +/- 0.03 cm, P = 0.05). Hypertensive NIDDM subjects exhibited a further increase in Cai (43.1 +/- 4.4 nmol/l, P = 0.05 vs. control subjects) and left ventricular mass (LVM) (201.5 +/- 12.2 vs. 155.8 +/- 7.7 g, P = 0.05 vs. control subjects). For all subjects, significant relationships were observed between Cai and fasting blood glu...Continue Reading
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