The Association Between Cardiovascular Autonomic Function and Changes in Kidney and Myocardial Function in Type 2 Diabetes and Healthy Controls

BACKGROUND

The mechanisms linking cardiovascular autonomic neuropathy, diabetic kidney disease and cardiovascular mortality in type 2 diabetes are widely unknown. We investigated the relationship between baseline cardiovascular autonomic function and changes in kidney and myocardial function over six years in patients with type 2 diabetes and healthy controls.

METHODS

Post-hoc analysis of a cohort study in 24 patients with type 2 diabetes and 18 healthy controls. Baseline determinants were cardiovascular autonomic reflex tests (heart rate response to: standing (30:15); deep breathing (E:I); and the Valsalva test) and time- and frequency-domain heart rate variability indices. Outcomes were changes in estimated glomerular filtration rate (eGFR), albuminuria, myocardial flow reserve (MFR) measured by cardiac ⁸²Rb Positron emission tomography computed tomography (PET/CT), and coronary artery calcium score (CACS).

RESULTS

Mean age at inclusion was 61 ± 10 years and 36% were female. Mean follow up time was 6 ± 0 years. A lower response in heart rate to the Valsalva test (corresponding to weaker autonomic function) was associated with a larger decline in eGFR (p=0.04), but not significantly after adjustment for sex, baseline age, smoking status, systolic blood pressure, heart rate, HbA_1c, body mass index and baseline eGFR (p=0.12). A higher baseline response in heart rate to standing (30:15) was associated with a larger decline in myocardial flow reserve in the unadjusted analysis (p=0.02) and after adjustment (p=0.02). A higher response in heart rate to the Valsalva maneuver was associated with a larger increase in CACS (p = 0.02), but the association became insignificant after adjustment (p = 0.16).

CONCLUSION

A lower response in heart rate to the Valsalva test was associated with a larger decline in kidney function, indicating that autonomic dysfunction may predict future loss of kidney function. However, we did not find any association between lower values in cardiovascular autonomic function at baseline and a worsening in albuminuria, myocardial function, or atherosclerotic burden.

P1006IMPACT OF GLUCOSE-LOWERING AND ANTIHYPERTENSIVE MEDICATIONS ON DEVELOPMENT OF MICROALBUMINURIA IN SUBJECTS WITH TYPE 2 DIATETES AND NORMOALBUMINURIA IN THE PRIORITY STUDY

Background and Aims

In the PRIORITY study, it was recently demonstrated that the urinary peptidome-based classifier CKD273 was associated with increased risk for progression to microalbuminuria. In this sub-study, we aim to evaluate whether glucose-lowering and antihypertensive medications, many of which have been demonstrated to have albuminuria-lowering effects, may interfere with the predictive value of CKD273.

Method

A post hoc analysis of a prospective observational study with embedded randomised placebo-controlled trial.

Setting

1775 subjects from 15 European sites with a mean follow-up time of 2.6 years (minimum of 7 days and a maximum of 4.3 years).

Patients

Subjects with T2D, normoalbuminuria and estimated glomerular filtration rate (eGFR) ≥ 45 ml/min/1.73m2. Participants were stratified into high- or low-risk groups based on their CKD273 score in a urine sample at screening (high-risk defined as score > 0.154).

Main outcome measures

Baseline medication or initiation during the study was assessed for the following medications: glitazones, glucagon-like peptide-1 receptor agonists (GLP1-RA), sodium-glucose cotransporter-2 inhibitors (SGLT2i), dipeptidyl peptidase-4 inhibitors (DPP4i), angiotensin-converting-enzyme inhibitors (ACEi), angiotensin-II-receptor blockers (ARB), calcium channel blockers (CCB) and beta blockers (BB). The main outcome was development of confirmed microalbuminuria (urinary albumin to creatinine ratio (UACR) >30 mg/g and with ≥30% increase from baseline) in 2 of 3 consecutive samples.

Results

The hazard ratio (HR (95% CI)) for development of microalbuminuria (high vs. low-risk) was 3.9 (2.9-5.3) in a crude Cox-model; and 2.4 (1.8-3.4; p<0.0001) when adjusted for age, sex, HbA1c, systolic blood pressure, retinopathy, eGFR and UACR. Adding baseline medications to the model did not significantly alter the results. When evaluating medications initiated during the study, more high- than low-risk subjects were started on glitazones, GLP1-RA, SGLT2i, CCB and BB (p<0.03), however, only initiation of DPP4i was associated with the outcome. Adjustment for DPP4i initiated during the study did not significantly change the HR for development of confirmed microalbuminuria (HR 2.5 (1.8 to 3.4); p<0.0001) in a model including eGFR and UACR. The HR for development of persistent microalbuminuria (spironolactone vs. placebo) was 0.81 (0.49-1.34; p=0.41), however, adjusting for DPP4i did not significantly alter this result.

Conclusion

Although several glucose-lowering and antihypertensive medications were more frequently prescribed in high-risk subjects, the CKD273 classifier prospectively predicted confirmed microalbuminuria, independent of baseline co-medications and medication initiated during the study. Moreover, initiated medications during the study could not explain the inability of spironolactone to delay progression to microalbuminuria.

MO048MULTICENTRE PROSPECTIVE VALIDATION OF THE URINARY PEPTIDOME-BASED CLASSIFIER CKD273 AS A PREDICTOR OF RENAL FUNCTION DECLINE IN SUBJECTS WITH TYPE 2 DIABETES

Background and Aims

In the PRIORITY study, it was recently demonstrated that the urinary peptidome-based classifier CKD273 was associated with increased risk for progression to microalbuminuria. As a prespecified secondary outcome, we aim to evaluate the classifier CKD273 as a determinant of relative reductions in eGFR (CKD-EPI) of 30% and 40% from baseline, at one timepoint without requirements of confirmation.

Method

The ‘Proteomic prediction and Renin angiotensin aldosterone system Inhibition prevention Of early diabetic nephRopathy In TYpe 2 diabetic patients with normoalbuminuria trial’ (PRIORITY) is the first prospective observational study to evaluate the early detection of diabetic kidney disease in subjects with type 2 diabetes (T2D) and normoalbuminuria using the CKD273 classifier.

Setting

1775 subjects from 15 European sites with a mean follow-up time of 2.6 years (minimum of 7 days and a maximum of 4.3 years).

Patients

Subjects with T2D, normoalbuminuria and estimated glomerular filtration rate (eGFR) ≥ 45 ml/min/1.73m2. Participants were stratified into high- or low-risk groups based on their CKD273 score in a urine sample at screening (high-risk defined as score > 0.154).

Results

In total, 12 % (n = 216) of the subjects had a high-risk proteomic pattern. Mean (SD) baseline eGFR was 88 (15) ml/min/1.73m2 in the low-risk group and 81 (17) ml/min/1.73m2 in the high-risk group (p < 0.01). Baseline median (interquartile range) urinary albumin to creatinine ratio (UACR) was 5 (3-8) mg/g and 7 (4-12) mg/g in the low-risk and high-risk groups, respectively (p < 0.01).

A 30 % reduction in eGFR from baseline was seen in 42 (19.4 %) subjects in the high-risk group as compared to 62 (3.9 %) in the low-risk group (p < 0.0001). In an unadjusted Cox-model the hazard ratio (HR) for the high-risk group was 5.7, 95 % confidence interval (CI) (3.9 to 8.5; p<0.0001). After adjustment for baseline eGFR and UACR, the HR was 5.2, 95 % CI (3.4 to 7.8; p<0.0001).

A 40 % reduction in eGFR was seen in 15 (6.9 %) subjects in the high-risk group whereas 22 (1.4 %) in the low-risk group developed this endpoint (p<0.0001). In an unadjusted Cox-model the HR for the high-risk group was 5.0, 95 % CI (2.6 to 9.6; p<0.0001). After adjustment for baseline eGFR and UACR, the HR was 4.8, 95 % CI (2.4 to 9.7; p<0.0001).

Conclusion

In normoalbuminuric subjects with T2D, the urinary proteomic classifier CKD273 predicts renal function decline of 30 % and 40 %, independent of baseline eGFR and albuminuria.