Invasive Management and Outcomes in Acute Coronary Syndromes and Chronic Kidney Disease (ANZACS-QI 70).

AIMS: Guidelines recommend management with an invasive coronary angiogram in acute coronary syndromes (ACS), but most studies excluded patients with advanced chronic kidney disease (CKD). Our aims were to describe, in a comprehensive ACS cohort, the incidence of CKD, coronary angiography utilisation and outcomes, according to CKD stage.

METHODS

National datasets were used to identify hospitalised ACS patients (2013 to 2018) in the Northern region of New Zealand. CKD stage was obtained from a linked laboratory dataset. Outcomes included all-cause and cause-specific mortality, and non-fatal myocardial infarction, heart failure and stroke.

RESULTS

Thirty-eight percent (38%) of the 23,432 ACS patients had CKD stage 3 or higher: 2,403 (10%) had stages 4/5 CKD. Overall 61% received coronary angiography. Compared with normal renal function the adjusted rate of coronary angiography was lower in CKD stage 3b (RR 0.75, 95% confidence intervals [CIs] 0.69, 0.82) and stages 4/5 without dialysis (RR 0.41, 95% CIs 0.36, 0.46), but similar for those on dialysis (RR 0.89, 95% CIs 0.77, 1.02). All-cause mortality (mean follow-up 3.2 years) increased with CKD stage from 8% (normal kidney function) to 69% (stages 4/5 CKD without dialysis). Compared with coronary angiography, the adjusted all-cause and CVD mortality risks were higher in those without coronary angiography, except for those on dialysis, where these risks converged.

CONCLUSIONS

Invasive management fell below an eGFR of 45 mL/min (≤ stage 3b), and nearly half of all deaths occurred in these patients. Clinical trials are needed to assess the role of invasive management in ACS and advanced CKD.