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Figure 1 Comparison of measurements of autonomic function tests between hypertensive diabetic (HD) and normotensive diabetic (ND) patients. (A) Baroreflex sensitivity (BRS). (B) Plasma norepinephrine (NE) concentration. (C) Heart rate variability (HRV). Power of high-frequency component ([HF] 0.15 to 0.40 Hz, a) and the ratio of the low-frequency power ([LF] 0.04 to 0.15 Hz) to HF power ([LF/HF] b). Values of HRV were transformed using a natural logarithm because their distributions were skewed. (D) Cardiac ¹²³I-metaiodobenzylguanidine (MIBG) scintigraphic findings. Myocardial uptake of ¹²³I-MIBG at early (a) and delayed (b) phases. Myocardial uptake of ¹²³I-MIBG is expressed as the mean heart-to-mediastinum (H/M) ratio. (c) Percent washout rate (WR) of ¹²³I-MIBG. Data are mean ± SD. *p < 0.05; **p < 0.01. ns = not significant.