Impact of percutaneous coronary intervention on patients with impaired baseline renal function.

Background: Acute kidney injury (AKI) frequently co-prevails with acute coronary syndromes (ACS), which could improve post percutaneous coronary intervention (PCI). We sought to evaluate the impact of PCI on post-procedural renal function in patients with impaired baseline serum creatinine (Cr).

Methods: Retrospective evaluation of 185 patients undergoing PCI with impaired basal serum Cr (≥ 1.5 mg/dl) was done, including 88 (47.5%) patients with recent ACS (≤2 weeks old) in group I and 97 (52.4%) patients in group II (stable angina or ACS >2 weeks old). Patients were classified into worsening or improving renal function based on a corresponding increase or decrease of ≥0.5 mg/dl (ΔCr) in serum Cr 24-48 h post PCI. ΔCr < 0.5 mg/dl was termed as no change.

Results: A trend towards improving renal function was seen in the study cohort (mean serum Cr: 2.37 ± 1.25 mg/dl vs 2.28 ± 1.59 mg/dl); (p = 0.09) with decrease in group I from 2.28 ± 1.09 mg/dl to 2.12 ± 1.44 mg/dl (p = 0.03) and in group II from 2.45 ± 1.38 mg/dl to 2.43 ± 1.71 mg/dl (p = 0.81). Post PCI, worsening occurred in 20/185 (10.8%) patients in the total study cohort, 5/88 (5.6%) in group I and 15/97 (15.4%) in group II (p = 0.03). Improvement in serum Cr was seen in 49/185 (26.4%) in the total study cohort, 30/88 (34.1%) in group I and 19/97 (19.6%) patients in group II (p = 0.03).

Conclusion: - Post PCI, only a small proportion of patients with impaired baseline creatinine showed worsening in renal function. Improved renal function was observed in at least one-third of the patients with recent ACS.