Table 1

Comparison between patients in the upper and lower halves of the distribution of plasma potassium concentration

K+ ≤4.2 mmol/l (n=1473)K+ >4.2 mmol/l (n=955)p Value
Data are numbers (percentages) or mean (SD). ACE, angiotensin converting enzyme. LVF, left ventricular failure.
Age (years)62 (13)65 (13)<0.0001
Plasma creatinine (μmmol/l)105 (44)120 (69)<0.0001
Male sex1003 (68.1%)692 (72.5%) 0.02
Diabetes337 (22.9%)328 (34.3%)<0.0001
Hypertension731 (49.6%)471 (49.3%)NS
Smoking497 (34.1%)299 (31.6%)NS
Admission drugs
    Aspirin789 (53.8%)531 (55.7%)NS
    ACE inhibitor305 (20.8%)245 (25.7%) 0.005
    Diuretic372 (25.4%)177 (18.7%) 0.0001
    β Blocker365 (24.9%)251 (26.3%)NS
    Statin377 (25.8%)265 (27.8%)NS
Admission haemodynamics
    Heart rate (beats/min)79 (20)79 (20)NS
    Systolic blood pressure (mm Hg)145 (29)144 (29)NS
Complications
    LVF176 (12.0%)163 (17.2%) 0.0004
    Ventricular fibrillation21 (1.4%)23 (2.4%)NS
Enzyme release and discharge diagnosis
    Peak CK (mmol/l)610 (1034)612 (1148)NS
    Acute myocardial infarction595 (40.4%)392 (41.0%)NS
    Unstable angina878 (59.6%)563 (59.0%)NS