SURE-HF: Urinary Sodium-Guided Diuretic Therapy in Heart Failure (SURE-HF)

June 1, 2026 updated by: Nurgul Ablakimova

Urinary Sodium-Guided Optimization of Diuretic Therapy in Patients With Worsening Heart Failure: Rationale and Design of a Pragmatic Randomized Controlled Trial (SURE-HF Trial)

The SURE-HF trial is a pragmatic, multicentre, randomized controlled study evaluating natriuresis-guided optimization of intravenous loop diuretic therapy in patients hospitalized with worsening heart failure (WHF). The study aims to determine whether serial urinary sodium assessment combined with a structured decongestive treatment algorithm improves decongestion, reduces the need for therapy escalation, and enhances discharge readiness compared with standard care.

Participants will be randomized to standard urine output-guided therapy or natriuresis-guided decongestive strategies using different intravenous loop diuretic administration regimens. The study integrates bedside diagnostic tools including lung ultrasound, inferior vena cava assessment, focused echocardiography, and serial clinical congestion monitoring.

The primary endpoint is a hierarchical composite outcome including escalation of heart failure therapy, persistent congestion at discharge, inability to transition to oral loop diuretics by Day 5, and residual ultrasound congestion. The findings of the SURE-HF trial may support implementation of urinary sodium-guided and ultrasound-assisted decongestive therapy in routine heart failure management.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

260

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Age ≥18 years.
  • Confirmed diagnosis of worsening heart failure (WHF), characterized by symptoms and signs of acute decompensation requiring hospitalization for intensification of intravenous diuretic therapy.
  • Previous intake of a loop diuretic (torasemide or furosemide) in any dose for at least 2 days before hospitalization.
  • Presence of clinical signs and symptoms of congestion (e.g., dyspnea, orthopnea, peripheral edema, pulmonary congestion).
  • Provision of written informed consent.

Exclusion Criteria:

  • Acute coronary syndrome within the previous 30 days.
  • Acute heart failure requiring urgent invasive intervention, including cardiogenic shock or mechanical circulatory support.
  • Current admission to an intensive care unit.
  • Systolic blood pressure ≤90 mmHg or requirement for inotropic/vasopressor support.
  • Recent use (≤48 hours) of inotropic agents affecting fluid and electrolyte balance.
  • Estimated glomerular filtration rate (eGFR) <30 mL/min/1.73 m² or requirement for renal replacement therapy.
  • Hypokalemia (<3.5 mmol/L) or hyperkalemia (≥5.5 mmol/L).
  • Clinically significant hyponatremia (<130 mmol/L) or hypernatremia (>150 mmol/L).
  • Significant comorbidities affecting sodium-water balance (e.g., liver cirrhosis with ascites, nephrotic syndrome, severe infection or sepsis).
  • Pregnancy or breastfeeding.
  • Active malignancy.
  • Inability to comply with the study protocol or participation in another interventional clinical trial.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Standard Treatment
Standard urine output-guided decongestive therapy according to institutional practice and predefined treatment protocols.
Drug: Furosemide
Intravenous loop diuretic therapy administered according to predefined treatment algorithms, including intermittent bolus administration, continuous infusion, or prolonged intermittent infusion with protocol-driven dose titration.
Experimental: Natriuresis-Guided Intermittent IV Bolus
Natriuresis-guided decongestive therapy using intermittent intravenous bolus administration of furosemide with dose titration based on urinary sodium assessment.
Drug: Furosemide
Intravenous loop diuretic therapy administered according to predefined treatment algorithms, including intermittent bolus administration, continuous infusion, or prolonged intermittent infusion with protocol-driven dose titration.
Device: Horiba LAQUAtwin B-722
Portable point-of-care urinary sodium analyzer used for serial spot urinary sodium measurements to guide decongestive therapy.
Experimental: Natriuresis-Guided Continuous Infusion
Natriuresis-guided decongestive therapy using continuous intravenous furosemide infusion via infusion pump with dose titration based on urinary sodium assessment.
Drug: Furosemide
Intravenous loop diuretic therapy administered according to predefined treatment algorithms, including intermittent bolus administration, continuous infusion, or prolonged intermittent infusion with protocol-driven dose titration.
Device: Horiba LAQUAtwin B-722
Portable point-of-care urinary sodium analyzer used for serial spot urinary sodium measurements to guide decongestive therapy.
Experimental: Natriuresis-Guided Prolonged Intermittent Infusion
Natriuresis-guided decongestive therapy using prolonged intermittent intravenous furosemide infusion with dose titration based on urinary sodium assessment.
Drug: Furosemide
Intravenous loop diuretic therapy administered according to predefined treatment algorithms, including intermittent bolus administration, continuous infusion, or prolonged intermittent infusion with protocol-driven dose titration.
Device: Horiba LAQUAtwin B-722
Portable point-of-care urinary sodium analyzer used for serial spot urinary sodium measurements to guide decongestive therapy.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Hierarchical Composite Endpoint of Unsuccessful Decongestion
Time Frame: From randomization through hospital discharge, assessed up to 14 days.
  1. Escalation of heart failure therapy within the first 5 days of hospitalization.
  2. Persistent clinical congestion at hospital discharge, defined as the presence of at least two of the following: dyspnea at rest, orthopnea, pulmonary rales, peripheral edema, or elevated jugular venous pressure.
  3. Failure to transition from intravenous to oral loop diuretics by Day 5 of hospitalization.
  4. Residual ultrasound congestion at hospital discharge, defined as ≥1 zone with ≥3 B-lines (one positive zone) on each hemithorax using 8-zone scanning
From randomization through hospital discharge, assessed up to 14 days.

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Total and Time-Specific Urinary Sodium Excretion
Time Frame: 6, 24, 48, and 72 hours after initiation of intravenous loop diuretic therapy.
Urinary sodium excretion measured at 6, 24, 48, and 72 hours after initiation of intravenous loop diuretic therapy.
6, 24, 48, and 72 hours after initiation of intravenous loop diuretic therapy.
Time to Clinical Decongestion
Time Frame: From initiation of intravenous loop diuretic therapy until clinical decongestion, assessed up to 14 days.
Time from initiation of intravenous loop diuretic therapy to achievement of clinical decongestion, defined as resolution of clinical signs and symptoms of congestion, including absence of dyspnea at rest, orthopnea, pulmonary rales, peripheral edema, and elevated jugular venous pressure.
From initiation of intravenous loop diuretic therapy until clinical decongestion, assessed up to 14 days.
Length of Hospital Stay
Time Frame: From hospital admission to hospital discharge, assessed up to 30 days.
Duration of hospitalization measured as the number of days from hospital admission to hospital discharge.
From hospital admission to hospital discharge, assessed up to 30 days.
Death or Heart Failure Rehospitalization Within 30 Days After Discharge
Time Frame: From hospital discharge through 30 days after discharge.
Composite outcome of all-cause mortality or rehospitalization due to worsening heart failure occurring within 30 days after hospital discharge.
From hospital discharge through 30 days after discharge.
Cumulative Urine Output
Time Frame: From initiation of intravenous loop diuretic therapy through hospital discharge, assessed up to 14 days.
Total urine output measured during hospitalization.
From initiation of intravenous loop diuretic therapy through hospital discharge, assessed up to 14 days.
Proportion of Patients Achieving Predefined Natriuresis Targets
Time Frame: Within 72 hours after initiation of intravenous loop diuretic therapy.
Proportion of patients achieving predefined urinary sodium excretion targets according to the study treatment algorithm during the first 72 hours of hospitalization.
Within 72 hours after initiation of intravenous loop diuretic therapy.

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Incidence of Symptomatic Hypotension
Time Frame: From randomization through hospital discharge, assessed up to 14 days.
Occurrence of symptomatic hypotension during hospitalization.
From randomization through hospital discharge, assessed up to 14 days.
Clinically Significant Electrolyte Disturbances
Time Frame: From baseline through hospital discharge, assessed up to 14 days.
Occurrence of clinically significant abnormalities in serum potassium or sodium during hospitalization.
From baseline through hospital discharge, assessed up to 14 days.
All-Cause In-Hospital Mortality
Time Frame: From randomization through hospital discharge, assessed up to 14 days.
Death from any cause occurring during hospitalization.
From randomization through hospital discharge, assessed up to 14 days.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Nurgul Ablakimova

Collaborators

I.M. Sechenov First Moscow State Medical University

Investigators

  • Principal Investigator: Nurgul Ablakimova, PhD, West Kazakhstan Marat Ospanov Medical University
  • Study Director: Vadim Medovchshikov, PhD, West Kazakhstan Marat Ospanov Medical University
  • Principal Investigator: Anzhela Soloveva, candidate of medical sciences, I.M. Sechenov First Moscow State Medical University
  • Study Chair: Svetlana Rachina, doctor of medical sciences, I.M. Sechenov First Moscow State Medical University
  • Study Chair: Gaziza Smagulova, candidate of medical sciences, West Kazakhstan Marat Ospanov Medical University
  • Principal Investigator: Ayagoz Meshitbayeva, West Kazakhstan Marat Ospanov Medical University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 1, 2026

Primary Completion (Estimated)

December 1, 2027

Study Completion (Estimated)

December 1, 2027

Study Registration Dates

First Submitted

May 27, 2026

First Submitted That Met QC Criteria

June 1, 2026

First Posted (Actual)

June 8, 2026

Study Record Updates

Last Update Posted (Actual)

June 8, 2026

Last Update Submitted That Met QC Criteria

June 1, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 13/2-19-38-7
  • Order №13/2-19-38-7 (Other Grant/Funding Number: West Kazakhstan Marat Ospanov medical university)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

De-identified individual participant data underlying the reported results may be shared upon reasonable request to the corresponding author following publication of the primary study results, subject to institutional approval and applicable data protection regulations.

IPD Sharing Time Frame

De-identified individual participant data and supporting documents will become available beginning 6 months after publication of the primary study results and will remain available for 5 years.

IPD Sharing Access Criteria

Access to de-identified individual participant data and supporting documents will be provided to qualified researchers upon reasonable request to the corresponding author and after approval by the study investigators and participating institution. Data sharing will be limited to non-commercial scientific research purposes and subject to applicable ethical and data protection requirements.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Heart Failure

Clinical Trials on Furosemide

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Denmark

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Subscribe