ALDOsterone for Prediction of Post-Operative Atrial Fibrillation (ALDO-POAF)

Post-operative atrial fibrillation (POAF) is a major and frequent complication occurring after cardiac surgery, contributing to prolonged intensive care and hospital stays and is associated with several cardiovascular complications. The exact mechanisms and signaling pathways involved in the development of POAF seem to be multifactorial and remain to date incompletely understood. β-blockers and amiodarone are the first line preventive drugs but are partially effective and near 30% of POAF resist to these strategies. In this context, there is some evidence indicating that renin-angiotensin-aldosterone system and Galectin-3 (Gal-3) share signaling pathways in the development of cardiac fibrosis and therefore could be very useful predictive biomarkers of POAF and potentially interesting therapeutic target to prevent POAF occurrence.

The investigators hypothesis is that preoperative plasma aldosterone levels and galectin-3 (Gal-3) expression (in plasma, right atrial appendage or epicardial fat) could be predictive of POAF in patients undergoing elective CABG surgery with preserved LVEF.

Study Overview

• Status: Unknown
• Conditions: Atrial Fibrillation

• Study Type: Observational
• Enrollment (Anticipated): 500

Contacts and Locations

Study Locations

• France
  • Basse Normandie
    • Caen, Basse Normandie, France, 14000
      • Recruiting
      • Joachim ALEXANDRE
      • Contact: Mathieu CHEQUEL, MD; Phone Number: +33625342363; Email: chequel-m@chu-caen.fr
      • Contact: Pierre OLLITRAULT, MD; Phone Number: +33624922671; Email: ollitrault-p@chu-caen.fr

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Probability Sample

Study Population

The ALDO-POAF study is an observational, 1-center and prospective pilot study that will enroll patients undergoing CABG ± aortic valve replacement. Patients who had emergency CABG, need for concomitant mitral surgery, left ventricular ejection fraction (LVEF) < 50%, a history of AF or other atrial arrhythmia, unstable angina or heart failure, cardiogenic shock, atrioventricular block, hypothyroidism/hyperthyroidism, previous heart surgery, and off-pump or on-pump beating CABG will be excluded. Approval for this study, including collection of human tissues (right atrial appendage, subcutaneous and epicardial fat) and blood collection, was obtained from the Ethics Committee of Caen University Hospital (Comité de Protection des Personnes Nord-Ouest III, Caen, France) and will be in accordance to the declaration of Helsinki; the details of the study will be explained to the subjects, and written informed consent will be obtained from each patient.

Description

Inclusion Criteria:

• Patients hospitalized for planned surgical coronary revascularization +/- aortic replacement valve
• Aged 18 years at least
• Clinically Stable (see criteria for non-inclusion)
• With left ventricular ejection fraction preserved (>50%)

Exclusion Criteria:

• Patient having already AF history
• Patient with primary hyperaldosteronism
• Unstable Patient defined as any cardiovascular event occurred in the previous 30 days

These events are:

• hospitalisation for cardiovascular causes
• appearance or worsening of symptoms consistent with cardiac failure
• appearance or worsening symptoms of coronary
• Patient refusing participation in the study
• Patient unable to provide follow-up visits
• need for concomitant mitral surgery
• Emergency CABG
• Left ventricular ejection fraction (LVEF) < 50%
• Previous heart surgery
• Off pump CABG.

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort

Planned cardiac surgery. POAF occurence or not; The ALDO-POAF study is an observational, 1-center and prospective pilot study that will enroll patients undergoing CABG ± aortic valve replacement. Patients who had emergency CABG, need for concomitant mitral surgery, left ventricular ejection fraction (LVEF) < 50%, a history of AF or other atrial arrhythmia, unstable angina or heart failure, cardiogenic shock, atrioventricular block, hypothyroidism/hyperthyroidism, previous heart surgery, and off-pump or on-pump beating CABG will be excluded.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Occurrence of atrial fibrillation in post-operative period of cardiac surgery (CABG +/- aortic valve replacement)	1 month

Secondary Outcome Measures

Outcome Measure	Time Frame
Find a correlation between the local secretion of aldosterone by adipocytes epicardial and the occurrence of AF during the 6 months after surgery in patients undergoing cold bypass coronary artery.	6 months
Find a correlation between aldosterone levels secreted in epicardial adipocytes and plasma aldosterone levels.	1 month
Find a correlation between preoperative plamastic aldosterone levels and occurence of postoperative atrial fibrillation	1 month
Detect aldosterone synthase aldosterone or angiotensin II (measured by quantitative and qualitative assays Western Blot, mRNA or RT-PCR) in the epicardial fat removed during surgery in patients undergoing a CABG.	1 month
Find a correlation between preoperative plamastic galectin-3 levels and occurrence of postoperative atrial fibrillation	1 month
Find a correlation between preoperative plamastic ngal levels and occurrence of postoperative atrial fibrillation	1 month
Find a correlation between preoperative mitochondrial function and occurrence of postoperative atrial fibrillation	1 month
Find a correlation between preoperative left atrial strain and occurrence of postoperative atrial fibrillation	1 month
Find a correlation between acute renal failure and occurrence of postoperative atrial fibrillation	1 month
Find a correlation between occurrence of postoperative atrial fibrillation and all cause cardiovascular morbimortality	2 years
Find a correlation between occurrence of postoperative atrial fibrillation and length of hospitalisation	1 month

Collaborators and Investigators

• Sponsor: University Hospital, Caen

Publications and helpful links

General Publications

• Ollitrault P, Allouche S, Chequel M, Milliez P, Alexandre J. Plasma aldosterone and atrial mitochondrial functions of patients undergoing cardiac surgery. Future Cardiol. 2020 Jul;16(4):275-280. doi: 10.2217/fca-2019-0028. Epub 2020 Apr 14.

Study record dates

Study Major Dates

• Study Start: January 1, 2014
• Primary Completion (Anticipated): June 1, 2017
• Study Completion (Anticipated): August 1, 2017

Study Registration Dates

• First Submitted: June 14, 2016
• First Submitted That Met QC Criteria: June 27, 2016
• First Posted (Estimate): June 28, 2016

Study Record Updates

• Last Update Posted (Estimate): June 28, 2016
• Last Update Submitted That Met QC Criteria: June 27, 2016
• Last Verified: June 1, 2016

More Information

Terms related to this study

• Keywords: cardiac surgery; atrial fibrillation; mitochondria; aldosterone; epicardial fat; galectin-3; ngal; acute kidney failure; right atrial sample
• Additional Relevant MeSH Terms: Pathologic Processes; Heart Diseases; Cardiovascular Diseases; Arrhythmias, Cardiac; Atrial Fibrillation
• Other Study ID Numbers: A14-D05-VOL.20

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES