Cause-Specific Mortality in Patients With Advanced Chronic Kidney Disease in the ISCHEMIA-CKD Trial

Cardiovascular disease risk assessment, exercise training, and management of complications in patients with chronic kidney disease

Patients with chronic kidney disease are at high and very high risk of cardiovascular disease. As estimated glomerular filtration rate declines, the incidence and severity of risk factors, complications, and atherosclerotic cardiovascular events increase. In this scenario, tailored assessment is the key to evaluate the severity of chronic kidney disease and estimate cardiovascular disease risk. Personalized stratification differentiates patients with chronic kidney disease without diabetes mellitus or established atherosclerotic cardiovascular disease in their management and beneficial treatment. Exercise intensity assessment and prescription is suggested to propose specific and safe recommendations for physical activity, training, and cardiac rehabilitation. Programs are based on a combination of endurance and resistance exercise and should be adapted to very high risk chronic kidney disease and haemodialysis patients and after kidney transplantation. Appropriate management of cardiovascular complications in these patients, such as risk factors, heart failure, arrhythmias, and coronary artery disease, is essential to ensure the best treatment and improve the prognosis. Therefore, we propose a critical and comprehensive review to suggest how to manage patients with chronic kidney disease in clinical practice and, specifically, with regard to cardiovascular risk assessment, exercise training prescription, and management of complications.

Inflammatory and Cardiovascular Events in CKD: The Multi-Ethnic Study of Atherosclerosis

RATIONALE & OBJECTIVE

Chronic kidney disease (CKD) is associated with a proinflammatory state caused by maladaptive immune response, predisposing to cardiovascular (CVD) and inflammatory/infectious disease outcomes. We sought to examine the association of chronic inflammation-related disease (ChrIRD) as compared to CVD events with worsening kidney function.

STUDY DESIGN

Longitudinal, observational study over 19 years follow-up.

SETTING & PARTICIPANTS

Participants free of CVD were enrolled from the Multi-Ethnic Study of Atherosclerosis (MESA), a multicenter, population-based cohort.

EXPOSURE

Baseline 5-level CKD categories based on modified KDIGO (Kidney Disease Improving Global Outcomes) groups using estimated glomerular filtration rate (eGFR, mL/min/1.73m2) and UACR (urine albumin-creatinine ratio, mg/g).

OUTCOME(S)

3 outcomes of interest: time to occurrence of first ChrIRD, time to first CVD, and time to all-cause mortality. ChrIRD encompassed inflammatory or infectious conditions identified using ICD (except kidney codes).

ANALYTICAL APPROACH

Proportional hazards regression analysis RESULTS: 6,705 participants (mean age 62 years, 53% female, 38.5% White, 27.6% Black, 22% Hispanic, 11.9% Chinese) were studied. Among study participants, 70% had no CKD, 17% low-risk CKD (eGFR>60 + UACR<10-29); 7% moderate-risk CKD (eGFR ≥60 + UACR 30-299), 4.6% high-risk CKD (eGFR 30-59 + UACR <30 or eGFR 45-59 + UACR 30-299 or eGFR ≥60 and UACR ≥300), 0.8% very high-risk (more advanced combinations of eGFR/UACR). Over 19-years follow-up, unadjusted incidence density (events/1000-person-years) of ChrIRD, CVD events were (respectively): 18, 11.9 for no CKD, 26.3, 18.4 low-risk, 39.7, 29.6 moderate-risk, 60.1, 35.4 high-risk CKD and 128.7, 56.6 very high-risk categories. After demographic adjustment, respective HRs (95% CI) for ChrIRD and CVD events were 1.23 (1.10-1.39), 1.35 (1.17-1.55) for low-risk, generally increasing to 3.87 (2.75-5.44), 2.84 (1.85-4.36) for very high-risk CKD categories.

LIMITATIONS

Unmeasured confounders and selection bias.

CONCLUSIONS

ChrIRD increased in a graded fashion with worsening CKD risk categories, starting with UACR > 10 mg/g.

Chronic Kidney Disease Predisposes to Acute Congestive Heart Failure, Cardiogenic Shock, and Mortality in Patients Undergoing Percutaneous Coronary Intervention

The relations between degrees of chronic kidney disease (CKD) and congestive heart failure (CHF) events after percutaneous coronary intervention (PCI) are not well characterized. We sought to determine the relation between different stages of CKD and acute CHF events, including HF and cardiogenic shock (CS), and the impact of CKD stages on all-cause mortality after PCI. Patients who underwent PCI from 2009 to 2017 were identified from our institution's National Cardiovascular Disease Registry CathPCI Database. Patients were stratified by CKD stage 1 (estimated glomerular filtration rate [eGFR] ≥90 ml/min/1.73 m2), 2 (60 to 89), 3a (45 to 59), 3b (30 to 44), 4 (16 to 29), 5 (≤15), and current dialysis. The primary end point was composite HF events defined as acute HF or CS within 30 days after PCI, or in-hospital mortality, stratified by CKD and analyzed by multivariable regression after screening with univariate analysis (p <0.05 entry criteria). Patients with CKD stage 3a or worse had more composite HF events, with an increase in all components, compared with patients with CKD stages 1 to 2 (p <0.0001 for all comparisons). After multivariable adjustment, CKD stages 3a to 5 remained independent predictors of composite HF or in-hospital mortality events. eGFR remained a strong predictor of acute HF events after multivariable adjustment, with a model including eGFR and baseline and procedural characteristics achieving excellent discriminatory ability with area under the curve 0.92. In conclusion, baseline eGFR is a strong, independent predictor of acute HF events after PCI. CKD stages 3a to 5 independently predict HF events including HF decompensation and CS and are predictors of in-hospital mortality after PCI. Patients with baseline CKD may benefit from targeted interventions to limit acute HF events after PCI.

Systemic Inflammatory Response Index (SIRI) is associated with all-cause mortality and cardiovascular mortality in population with chronic kidney disease: evidence from NHANES (2001-2018)

Objective

To examine the correlation between SIRI and the probability of cardiovascular mortality as well as all-cause mortality in individuals with chronic kidney disease.

Methods

A cohort of 3,262 participants from the US National Health and Nutrition Examination Survey (NHANES) database were included in the study. We categorized participants into five groups based on the stage of chronic kidney disease. A weighted Cox regression model was applied to assess the relationship between SIRI and mortality. Subgroup analyses, Kaplan-Meier survival curves, and ROC curves were conducted. Additionally, restricted cubic spline analysis was employed to elucidate the detailed association between SIRI and hazard ratio (HR).

Results

This study included a cohort of 3,262 individuals, of whom 1,535 were male (weighted proportion: 42%), and 2,216 were aged 60 or above (weighted proportion: 59%). Following adjustments for covariates like age, sex, race, and education, elevated SIRI remained a significant independent risk factor for cardiovascular mortality (HR=2.50, 95%CI: 1.62-3.84, p<0.001) and all-cause mortality (HR=3.02, 95%CI: 2.03-4.51, p<0.001) in CKD patients. The restricted cubic spline analysis indicated a nonlinear relationship between SIRI and cardiovascular mortality, with SIRI>1.2 identified as an independent risk factor for cardiovascular mortality in CKD patients.

Conclusion

Heightened SIRI independently poses a risk for both all-cause and cardiovascular mortality in chronic kidney disease patients, with potentially heightened significance in the early stages (Stage I to Stage III) of chronic kidney disease.

The potential association between influenza vaccination and lower incidence of renal cell carcinoma

It is well-established that kidney cancer or renal cell carcinoma (RCC) occurs more commonly in chronic kidney disease (CKD) than in the general population, although the underlying mechanisms are incompletely understood. Beyond hereditary RCC syndromes; smoking, obesity and hypertension are widely known risk factors for RCC, irrespective of CKD. Kidney-specific factors such as episodes of acute kidney injury, nephrolithiasis and cyst formation have also been shown to be associated with RCC development. One potential and less explored factor is the role of viruses in the development of kidney cancer. In this issue of Clinical Kidney Journal, Lin et al. raise the interesting hypothesis that influenza vaccination may be associated with lower incidence of RCC in adults with CKD. We discuss potential mechanisms underlying this interesting observation in the context of immune dysregulation in CKD.

ISCHEMIA-EXTEND studies: Rationale and design

BACKGROUND

The ISCHEMIA and the ISCHEMIA-CKD trials found no statistical difference in the primary clinical endpoint between initial invasive management and initial conservative management of patients with chronic coronary disease and moderate to severe ischemia on stress testing without or with advanced chronic kidney disease (CKD). In ISCHEMIA, there was numerically lower cardiovascular mortality but higher non-cardiovascular mortality with no significant difference in all-cause death with an initial invasive strategy when compared with a conservative strategy. However, an invasive strategy increased peri-procedural myocardial infarction (MI) but decreased spontaneous MI with continued separation of curves over time, which potentially may lead to reduced risk of cardiovascular and all-cause mortality. Thus, the long-term effect of invasive management strategy on mortality remains unclear. In ISCHEMIA-CKD, the treatment and cause-specific mortality rates were similar during follow-up.

METHODS

Funded by the National Heart, Lung, and Blood Institute, the ISCHEMIA-EXTEND observational study is the long-term follow-up of surviving participants (projected median of 10 years) with chronic coronary disease from the ISCHEMIA trial. In the ISCHEMIA trial, 5,179 participants with moderate or severe stress-induced ischemia were randomized to initial invasive management with angiography, revascularization when feasible, and guideline-directed medical therapy (GDMT), or initial conservative management with GDMT alone and angiography reserved for failure of medical therapy. ISCHEMIA-CKD EXTEND is the long-term follow-up of surviving participants (projected median of 9 years) from the ISCHEMIA-CKD trial, a companion trial that included 777 patients with advanced CKD. Ascertainment of death will be conducted via direct participant contact, medical record review, and/or vital status registry search. The overarching objective of long-term follow-up is to assess whether there are between-group differences in long-term all-cause, cardiovascular, and non-cardiovascular mortality, and increase precision around the treatment effect estimates for risk of all-cause, cardiovascular, and non-cardiovascular mortality. We will conduct Bayesian survival modeling to take advantage of rich inferences using the posterior distribution of the treatment effect.

CONCLUSIONS

The long-term effect of an initial invasive versus conservative strategy on all-cause, cardiovascular, and non-cardiovascular mortality will be assessed. The findings of ISCHEMIA-EXTEND and ISCHEMIA-CKD EXTEND will inform patients, practitioners, practice guidelines, and health policy.