N-Acetyl-procainamide kinetics in the elderly.
Plasma and saliva N-acetyl-procainamide (NAPA) concentrations were measured by high-power liquid chromatography (HPLC) after intravenous infusion of 750 mg to 14 elderly patients (x age = 69 yr). The plasma NAPA disappearance curve can best be described by a two-compartment body model. Mean total body clearance was 10.6 1/hr, Vdss 125.8 1, and terminal half-life (t 1/2) 8.8 hr. A nonrenal clearance of 2.72 1/hr was calculated, that is, 19% of the expected total body clearance with normal kidney function. Saliva concentrations show huge inter- and intraindividual variability and are probably not usable for NAPA monitoring in older patients.
D000120:Acecainide / Q000097:blood / Q000378:metabolism*; D000368:Aged; D006801:Humans; D007700:Kinetics; D008875:Middle Aged; D008954:Models, Biological; D011342:Procainamide / Q000031:analogs & derivatives*; D012463:Saliva / Q000378:metabolism
D000120:Acecainide; D011342:Procainamide