Table 1.

Demographic and clinical features in 25 subjects (50 kidneys) undergoing blood oxygen-level-dependent (BOLD) magnetic resonance (MR)

	“Normal” Kidneys	“Abnormal” Kidneys	Entire Group
n	21	29	50
Men/women	9/12	13/16	22/28
Age (yr)	69.1 ± 2.9	68.8 ± 2.2	69 ± 1.8 ± 12.5
Creatinine (mg/dl)	1.48 ± 0.15	1.87 ± 0.15	1.71 ± 0.11
Renal artery stenosis > 70%	10	19	29
Estimated GFR (total) ml/min/1.73 m2	49 ± 3.4	38.3 ± 3.4**	43 ± 2.5
BOLD MR
Cortex-basal R2*	22.2 ± 2.8	16.7 ± 12.8**	19.0 ± 14
Post-furosemide R2*	19.1 ± 2.3	17.3 ± 1.7	18.1 ± 1.4
Delta R2* (%)	30.9 ± 9 (11.3 ± 3.1%)	−6 ± 6 (−1.3 ± 2.4%)*	9.6 ± 5 (3.9 ± 2.1%)
Medulla-basal R2*	24.9 ± 3.8	16.9 ± 1.3**	20.3 ± 1.8
Post-furosemide	19.9 ± 3.2	17.3 ± 1.7	18.4 ± 1.7
Delta R2* (%)	49.5 ± 9 (20.3 ± 2.4%)	−3.6 ± 6 (0.2 ± 3.4%)*	18.7 ± 6

^*P < 0.05,

^**P < 0.01 versus “normal” kidneys.