Table 2.

Serum and urine data before and after clamp

Data	Preclamp/Postclamp	Nondiabetic Group	Diabetic Group	P
Plasma [K+] (mM)	Preclamp	4.0 ± 0.4	4.0 ± 0.2	0.58
	Postclamp	3.5 ± 0.2a	3.6 ± 0.3a	0.41
Plasma phosphorus concentration (mM)	Preclamp	0.93 ± 0.11	1.00 ± 0.16	0.11
	Postclamp	0.57 ± 0.11b	0.69 ± 0.19b	0.05
Plasma creatinine (mg/dl)	Preclamp	0.9 ± 0.2	0.9 ± 0.2	0.95
	Postclamp	0.9 ± 0.2	0.9 ± 0.2	0.70
Plasma insulin (μU/ml)	Preclamp	8.6 ± 3.6	12.0 ± 8.4	0.25
	Postclamp	149.3 ± 34.1b	151.6 ± 36.2b	0.85
Plasma glucose (mg/dl)	Preclamp	92 ± 7	118 ± 34	0.02
	Postclamp	91 ± 7	100 ± 15	0.05
UKV (mmol/2 h)	Preclamp	1.11 ± 0.90	0.70 ± 0.86	0.17
	Postclamp	1.24 ± 0.71	0.67 ± 0.56	0.02
UPV (mmol/2 h)	Preclamp	3.17 ± 3.18	3.53 ± 5.54	0.83
	Postclamp	1.67 ± 1.12b	1.41 ± 0.97	0.48

Values are mean +/− standard deviation. [K⁺], potassium concentration; U_KV, urine potassium excretion rate; U_PV, urine phosphorus excretion rate.

P value compares nondiabetic group to diabetic group. Comparison of pre- versus postclamp values:

^aP < 0.05,

^bP < 0.01.