Natriuresis-guided Depletion After Cardiac Surgery

Centre Hospitalier Universitaire, Amiens102 enrolled

Overview

Fluid overload (FO) is a common complication after cardiac surgery, associated with increased morbidity and mortality. Loop diuretics, especially furosemide, are routinely used to manage FO, but their use is often empirical. Recent data suggest that natriuresis-guided furosemide titration using point-of-care urinary sodium sensors (LAQUAtwin NA-11, Horiba) may improve the efficiency and safety of fluid removal, but no randomized trial has yet evaluated this approach in postoperative cardiac surgery patients Our goal is to assess the clinical impact, safety, and feasibility of a natriuresis-guided furosemide protocol after cardiac surgery requiring cardiopulmonary bypass.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

102

Conditions

Cardiac Surgery Diuresis Congestion, Venous Sodium Depletion

Interventions

Furosemide intravenous titration based on natriuresisDRUG

Furosemide IV, 20 mg starting dose, titrated every 6 hours based on urinary sodium measured by the LAQUAtwin NA-11 device. Urine output will be measured and recorded every 4 hours to ensure accurate diuresis tracking. If natriuresis is \< 70 mmol/L, the furosemide dose will be doubled, with a maximum limit of 200 mg per bolus. If natriuresis is ≥ 70 mmol/L, the current dose will be maintained. Blood electrolyte panels and renal function assessments will be performed twice daily throughout the protocol. In the event of hemodynamic instability, a complete echocardiographic assessment will be performed for all patients to detect potential surgical complications, along with a hemodynamic evaluation to guide appropriate management.

Furosemide intravenous titration based on clinical examinationDRUG

Furosemide IV, 20 mg starting dose, titrated every 6 hours clinical evaluation. Urine output will be measured and recorded every 4 hours to ensure accurate diuresis tracking. The furosemide dosage will be adjusted based on urine output with a maximum bolus dose of 200 mg. Dose adjustments will be reassessed every 6 hours throughout the study period. Blood electrolyte panels and renal function assessments will be performed twice daily throughout the protocol. In the event of hemodynamic instability, a complete echocardiographic assessment will be performed for all patients to detect potential surgical complications, along with a hemodynamic evaluation to guide appropriate management.

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Adult patient (age \> 18 years) * Scheduled for cardiac surgery, including mitral valve repair or replacement, aortic valve replacement, coronary artery bypass grafting (CABG), ascending aortic repair, or combined procedures * Undergoing surgery with cardiopulmonary bypass (CPB) * Eligible to receive intravenous furosemide for fluid overload within 48 hours following surgery, as prescribed by the referring physician * Written and oral informed consent obtained * Covered by the French national health insurance (Sécurité Sociale) Exclusion Criteria: * Aortic arch repair requiring deep hypothermic circulatory arrest * Active endocarditis * Hemodynamic instability requiring vasopressor or inotropic support (norepinephrine, dobutamine, epinephrine, or vasopressin) * Failure to wean from CPB requiring mechanical circulatory support * Chronic kidney disease with an estimated glomerular filtration rate (eGFR) \< 60 mL/min * Chronic use of loop diuretics * Known allergy to furosemide * Active postoperative bleeding and/or reoperation for bleeding * Participation in another interventional study that may affect the primary outcome measure * Patient deprived of liberty by administrative or judicial decision, or placed under legal protection (guardianship or curatorship)

Outcomes

Primary Outcomes

Total urine output (mL) at 48 hours after randomization.

All patients were equipped with urinary catheters, allowing for continuous urine collection. Urine output was measured every 2 hours, and the recorded volumes were entered into a monitoring software to ensure accurate follow-up

Time frame: 48 hours after randomization

Secondary Outcomes

Urine output at 24 hours

Time frame: 24 hours after randomization

Natriuresis at 24 hours

Total natriuresis is measured at 24 hours using the indirect potentiometry technique at the CHU Amiens-Picardie laboratory.

Time frame: 24 hours after randomization

Natriuresis at 48 hours

Total natriuresis is measured at 48 hours using the indirect potentiometry technique at the CHU Amiens-Picardie laboratory.

Time frame: 48 hours after randomization

VExUS score at 48 hours

The VExUS score is an echocardiographic score (ranging from 0 to 3) used to assess venous congestion at the cardiac, renal, and hepatic levels. This score will be measured after randomization and at 48 hours after randomization. Grade 0: IVC \<2cm = No Congestion Grade 1: IVC \>2cm with any combo of Normal or Mildly Abnormal Patterns = Mild Congestion Grade 2: IVC \>2cm and one severely Abnormal Pattern = Moderate Congestion Grade 3: IVC \>2cm and \>2 Severely Abnormal Patterns = Severe Congestion

Time frame: 48 hours after randomization

Total loop diuretics

Total dose of loop diuretics administered during the study period (mg)

Time frame: During the study period (48 hours)

Cumulative Fluid balance

Fluid balance corresponds to the difference between administered fluids (intravenous infusions, blood products, enteral nutrition) and fluid losses (urine output, blood loss, digestive losses, drain output). It is calculated using the DianeRéa software (Bowmedical, version 4.8.11.22887), taking into account all fluid inputs (administered fluids, medications, nutrition) and all fluid outputs (urine, drains, perspiration) over the period from inclusion to 48 hours after randomization

Time frame: At inclusion and 48 hours after randomization

Number of Participants with Postoperative Complications by Day 30

Composite outcome measuring the number of participants who experience at least one of the following postoperative complications within 30 days of surgery: Cardiovascular: * Acute left and right ventricular systolic heart failure * Acute circulatory failure requiring catecholamine support * Supraventricular (e.g., atrial fibrillation) or ventricular arrhythmias. Respiratory: * Acute respiratory distress syndrome (ARDS) * Prolonged orotracheal intubation (\> 24 hours). * Reintubation. Renal: \- Acute kidney injury (AKI), defined by a postoperative increase in serum creatinine of at least 50% and/or ≥ 26.5 µmol/L from baseline, and/or urine output \< 0.5 mL/kg/h for ≥ 6 hours (KDIGO criteria). Serum creatinine and estimated glomerular filtration rate (eGFR) measured on the day of hospital discharge. Gastrointestinal: * Mesenteric ischemia or ischemic colitis, documented by imaging (CT scan), colonoscopy, and/or surgery. * Length of hospital stay (days). * In-hospital mortality.

Time frame: Day 30 after randomization

Number of Participants with Contraindications to Furosemide Administration

Number of participants presenting contraindications prior to furosemide administration, including: * Symptomatic hypotension * Hypokalemia * Impaired renal function

Time frame: During the study period (48 hours after randomization)

Number of Corrective Measures Implemented Prior to Furosemide Administration

Number of participants for whom corrective actions (e.g., potassium supplementation, fluid resuscitation) were implemented to allow safe administration of furosemide.

Time frame: Within 48 hours after randomization

Natriuresis-guided Depletion After Cardiac Surgery

Overview

Conditions

Interventions

Eligibility

Locations (1)

Outcomes

Primary Outcomes

Secondary Outcomes

Central Contacts