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[The impact of renal function on clinical outcomes of patients without chronic kidney disease undergoing coronary
Qiang Zhang1, Chang-Sheng Ma, Shao-Ping Nie
1Department of Cardiology, Beijing Anzhen Hospital, Capital University of Medical Sciences, Beijing 100029, China.
Insights
Renal insufficiency, even mild, is common in patients undergoing coronary revascularization and linked to worse outcomes. Choosing the right revascularization method may improve prognosis for those with normal or mild renal insufficiency.
Area of Science:
- Cardiology
- Nephrology
- Clinical Outcomes
Context:
- Coronary revascularization procedures carry risks, particularly for patients with pre-existing renal conditions.
- Understanding the impact of renal function on outcomes is crucial for patient management.
Purpose:
- To determine the prevalence of renal insufficiency in patients undergoing coronary revascularization.
- To analyze the effect of varying degrees of renal insufficiency on clinical outcomes.
- To investigate if the choice of revascularization strategy influences prognosis.
Summary:
- A study of 2896 patients found renal insufficiency common, with mild cases (CrCl 60-90 ml/min) showing increased in-hospital mortality and major adverse cardiac and cerebral events (MACCE).
- Both in-hospital and follow-up periods revealed significant differences in mortality, stroke, and MACCE across renal function groups.
- Independent risk factors for death included revascularization mode, age, and creatinine clearance (CrCl) level.
Impact:
- Even mild renal insufficiency is associated with adverse clinical outcomes post-revascularization.
- For patients with normal or mild renal insufficiency, the choice between percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) may impact prognosis, with PCI showing lower mortality.
Objective:
This study determined the profile of renal insufficiency in patients without chronic kidney disease (CKD) undergoing coronary revascularization and elucidated the effect of renal insufficiency of different degrees on clinical outcomes after revascularization and examined whether the reasonable choice of the mode of revascularization could favourably influence prognosis.
Methods:
Patients undergoing coronary revascularization were grouped by estimated creatinine clearance (CrCl) (Group I, CrCl > or = 90 ml/min; Group II, 60 < or = CrCl < 90 ml/min; Group III, 30 < or = CrCl < 60 ml/min; Group IV, CrCl < 30 ml/min). We evaluated the relationship between the CrCl and the clinical outcomes of all of the patients.
Results:
The mean Scr level of 2896 patients was (80.0 +/- 35.4) micromol/L. There were 1035 patients (35.7%) in Group I, 1337 patients (46.2%) in Group II, 524 patients (18.1%) in Group III and no patient in Group IV. During hospitalization, significant difference was found among Group I-III on mortality (1.0%, 2.5% and 2.9%, P = 0.009) and major adverse cardiac cerebra events (MACCE) (1.4%, 3.5% and 4.6%, P = 0.001). Compared with the normal renal function group, there were significantly higher rate of mortality (2.5% vs. 1.0%, P = 0.007), new-onset myocardial infarction (1.0% vs. 0.2%, P = 0.018) and MACCE (3.5% vs. 1.4%, P = 0.002) in mild renal insufficiency (Grou II). During follow-up, there were significant difference among Group I-III on mortality (2.0%, 3.0% and 5.7%, P = 0.002), stroke (1.0%, 1.8% and 3.1%, P = 0.023) and MACCE (9.9%, 10.3% and 16.6%, P = 0.001). The independent risk factors for all-cause death in patients after revascularization were the mode of revascularization (OR 8.332, 95%CI 2.386 - 22.869, P = 0.001), age (OR 1.184, 95%CI 1.020 - 1.246, P = 0.001), and the level of CrCl (OR 0.503, 95%CI 0.186 - 0.988, P = 0.045). In patients with normal renal function and mild renal insufficiency, the all-cause mortality after PCI was significantly lower that than after CABG (both P < 0.01).
Conclusions:
Renal insufficiency is common in patients without CKD undergoing coronary revascularization, even mild renal insufficiency is correlated with adverse clinical outcomes after revascularization. In patients with normal renal function or mild renal insufficiency, the mode of revascularization might lead to a prognostic difference.
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