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National Kidney Foundation guidelines recommend stopping angiotensin-converting–enzyme (ACE) inhibitors or angiotensin-receptor blockers (ARBs) if serum creatinine increases by ≥30% after starting treatment. However, the rationale for this 30% threshold is unclear. In this cohort study of 122,000 U.K. adults, researchers assessed outcomes associated with rises in serum creatinine concentrations during the first 2 months after beginning ACE inhibitor or ARB treatment.
About 2100 patients (1.7%) had serum creatinine increases of ≥30% after starting treatment. Compared with patients in whom creatinine increased by <30%, those with larger increases were more likely to die (adjusted incident rate ratio, 1.84) or to develop end-stage kidney diseas…