Heart FailureSAUNA-HF RCTNCT07468344
Evaluation of the Effects of Sauna Therapy on Congestion and Loop Diuretic Use in Patients With Heart Failure With Reduced or Moderately Reduced Ejection Fraction
A study testing Sauna in people with Heart Failure, run by Central Hospital, Nancy, France at 1 site in France.
Trial summary
This study aims to evaluate the effect of sauna therapy on congestion levels during cardiac rehabilitation in patients with heart failure who have an impaired or moderately impaired ejection fraction, compared to standard cardiac rehabilitation care. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Heart Failure
- What is being tested?
- Sauna
- Type of treatment
- Medical device
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 46 participants
- Where
- 1 siteFrance
- Study dates
- 23 Jun 2026to 23 Sep 2027
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Age ≥ 18 years.
- Heart failure with ejection fraction <50% confirmed by an echocardiogram within the past year.
- NYHA class II-III.
- Loop diuretic dose ≥ 40 mg/day of furosemide (or equivalent) for at least 30 days.
- NT-proBNP > 400 pg/ml or BNP > 100 pg/ml.
- Estimated glomerular filtration rate (eGFR) ≥ 20 ml/min/1.73 m².
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- Patient scheduled for a hospital-based cardiac rehabilitation program for a minimum of 3 weeks.
- Person who has undergone a preliminary clinical examination suitable for clinical research.
- Person affiliated with a social security system or a beneficiary of such a system.
- Person who has received complete information about the organization of the clinical research and has signed informed consent.
Who cannot join
- Person presenting a contraindication to sauna therapy (for example, intolerance to heat).
- Serum sodium < 130 mmol/L.
- Serum potassium > 5.5 mmol/L.
- Active infection, liver disease, or peripheral vascular disease.
- Acute coronary syndrome or recent stroke (<90 days).
- Participation in another interventional clinical trial.
- Person subject to Articles L. 1121-5, L. 1121-7, and L. 1121-8 of the Public Health Code (applicable in France) :- pregnant, giving birth, or breastfeeding woman , minor (non-emancipated), person adult subject to a legal protection measure (guardianship, curatorship, judicial protection) , adult unable to express consent, persons deprived of liberty by judicial or administrative decision, persons receiving psychiatric care under Articles L. 3212-1 and L. 3213-1…
- Person who objects to the processing of their data for quality control purposes
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
France1 site, 1 recruiting
- Recruiting
Centre Hospitalier Régional Universitaire de Nancy
Nancy
Nicolas Girerd, +33 03 83 15 74 96, n.girerd@chru-nancy.fr
About this study
Official title: Impact of Sauna Therapy on Congestion and Loop Diuretic Adjustment in Patients With Heart Failure
This study aims to evaluate the effect of sauna therapy on congestion levels during cardiac rehabilitation in patients with heart failure who have an impaired or moderately impaired ejection fraction, compared to standard cardiac rehabilitation care. To investigate this, patients with reduced cardiac function who are hospitalized as part of a cardiac rehabilitation program will be included. These patients will be randomly assigned to two groups: standard cardiac rehabilitation program (control group) and sauna group (intervention group). The study will also assess whether this approach could allow for a reduction in the dose of diuretics, which are commonly used to remove excess fluid, thereby helping to avoid certain side effects. The expected benefits include a reduction in symptoms such as shortness of breath and swelling, improvements in quality of life and physical fitness, and enhanced blood vessel function.
- Conditions
- Heart Failure
- Being tested
- Sauna
- Keywords
- congestion, sauna, heart failure
- Medical subject headings
- Heart Failure
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
SaunaDevice
A 15-minute sauna session at 60 degrees Celsius, five times a week for three weeks during hospitalization for cardiac rehabilitation. The sauna sessions will be followed by 30 minutes of recovery in a seated position. In addition to the sauna, patients will benefit from cardiac rehabilitation care for 3 weeks.
| Study group | Role | What they receive |
|---|---|---|
| Sauna | Experimental | A 15-minute sauna session at 60 degrees Celsius during hospitalization for cardiac rehabilitation. Receives: Device: Sauna |
| Control | No intervention | Usual care as part of a day hospital stay for cardiac rehabilitation. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Median change in NT-proBNP levels.
Measured: Between randomization and the end of the third week.
Secondary outcomes (35)
Daily dose of loop diuretics.
Measured: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Weight in kilograms.
Measured: Day 1, end of weeks 1,2 and 3, and 3-month follow-up.
Congestion score: ADVoR congestion score.
ADVoR congestion score is a grading scale taking account oedema, pleural effusion and ascites. The score can range from 0 to 10 with "0" being the best result meaning " no congestion " and "10" the worst meaning " maximum congestion ".
Measured: Day 1, end of week 3, and 3-month follow-up.
Congestion score: Ambrosy congestion score.
Ambrosy congestion score is a grading scale taking account dyspnoea, orthopnoea, jugular venous distension, rales and oedema.
The score can range from 0 to 18, "0" being the best outcome (no congestion) and "18" the worst outcome (maximum congestion).
Measured: Day 1, end of week 3, and 3-month follow-up.
Estimated plasma volume (EPV): Duarte formula.
Measured: Day 1, end of week 3, and 3-month follow-up.
Dyspnea visual analog scale: Cumulative dyspnea assessment (AUC).
The minimum value is "0" (best outcome) and means "no dyspnea". The maximum value is "10" (worst outcome) and means "maximum dyspnea".
Measured: Day 1, beginning of weeks 2 and 3.
Concentration of natriuretic peptides (NT-proBNP).
Measured: Day 1, end of week 1, beginning and end of week 2, beginning and end of week 3, and 3-month follow-up.
Evaluation of renal function through rate of serum creatinine allowing to estimate glomerular filtration rate.
Estimate glomerular filtration rate is calculated by the following formula :
Clearance (mL/min) = weight (kg) x (140-age) x K / serum creatinine (μmol/L) ; K=1.23 for man and 1.04 for woman.
Measured: End of weeks 1, 2, and 3 and 3-month follow-up.
Evaluation of renal function through renal function assessment.
Measured: Day 1 and end of week 3.
Dose of diuretics.
Measured: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Concentration of serum electrolytes (Cl-, Na+, K+).
Measured: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Blood osmolality in mmol/L.
Blood osmolality in mmol/L is calculated using natremia, glycemia and uremia. The formula is : Natremia in mmmol/L*2 + glycemia in mmol/L *5.56 + uremia in mmol/L*16.6.
Measured: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Concentration of urinary electrolytes (Cl-, Na+, K+).
Measured: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Urinary osmolality in mmol/L.
Urinary osmolality in mmol/L is calculated using natremia, glycemia and uremia. The formula is : (natremia in mmol/L + kaliemia in mmol/L+ chloride in mmol/L) + (glycemia in mmol/L*5.56) + (uremia in mmol/L*16.6).
Measured: Day 1, beginning and end of weeks 1, 2, and 3, and 3-month follow-up.
Hemoconcentration biomarkers : Hct.
Hemoconcentration was assessed using hematocrit (%).
Measured: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Hemoconcentration biomarkers : Hb.
Hemoconcentration was assessed using hemoglobin (g/dL).
Measured: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Hemoconcentration biomarkers : total protein.
Hemoconcentration was assessed using total protein (g/L).
Measured: Time Frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Hemoconcentration biomarkers : copeptin.
Hemoconcentration was assessed using copeptin concentrations (pmol/L).
Measured: Time Frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Inferior vena cava diameter (millimeters, mm) measured by transthoracic echocardiography during inspiration.
The inferior vena cava (IVC) diameter will be measured in millimeters using transthoracic echocardiography.
Measured: Day 1, end of week 1, beginning and end of week 2, beginning and end of week 3, and 3-month follow-up.
Inferior vena cava diameter (millimeters, mm) in expiration measured by transthoracic echocardiography during expiration.
IVC diameter will be measured in millimeters using transthoracic echocardiography.
Measured: Day 1, end of week 1, beginning and end of week 2, beginning and end of week 3, and 3-month follow-up.
Inferior vena cava respiratory variation / collapsibility index (percentage, %) assessed by transthoracic echocardiography.
VCI respiratory variation will be assessed using transthoracic echocardiography and expressed as the collapsibility index. Collapsibility index will be measured as the ratio between IVC diameter in inspiration (outcome 17) and IVC diameter in expiration (outcome 18) expressed in %.
Measured: Day 1, end of week 1, beginning and end of week 2, beginning and end of week 3, and 3-month follow-up.
Lung ultrasound score (8 points).
Evaluation of lung comet presence measured by an 8-points lung echography and rated on a scale ranging from 0 (minimum - best outcome : no congestion) to 10 (maximum - worst outcome : maximum congestion) per point.
Measured: Day 1, end of week 3, and 3-month follow-up.
Quantification of changes in systolic and diastolic function.
Measured: Day 1 and 3-month follow-up.
Heart rate in Beats Per Minute (BPM).
Measured: Multiple daily measurements : 4 times a day, 5 days a week for 3 weeks.
Heart rate variability in millisecond (ms).
Measured: Multiple daily measurements : 4 times a day, 5 days a week for 3 weeks.
Blood pressure in mmHg.
Blood pressure will be measured daily for 3 weeks and at 3-month follow-up.
Measured: Up to 3 weeks and at 3-month follow-up.
Monitoring of changes in pulmonary blood pressure.
Changes in pulmonary blood pressure will be measured with echocardiography.
Measured: Day 1 and at 3-month follow-up.
Composite clinical endpoint of hospitalization or emergency visits for heart failure or all-cause death.
Measured: At 3-month follow-up.
Body composition parameters assessed by bioelectrical impedance analysis.
Evaluation of the patient's body composition parameters. This measure includes the assessment of fluid distribution-Total Body Water (TBW), Intracellular Water (ICW), and Extracellular Water (ECW)-as well as tissue compartments: body protein mass, body mineral mass, and fat mass. The device records multiple parameters, the analysis will focus specifically on these pre-specified indicators of body composition.
Measured: Day 1, end of Week 1, beginning and end of Week 2, beginning and end of Week 3, and at 3-month follow-up.
Specific to the sauna group : weight in kilograms.
Weight will be measured before and after each sauna session.
Measured: Up to 3 weeks.
Specific to the sauna group : blood pressure in mmHg.
Blood pressure will be measured before and after each sauna session.
Measured: Up to 3 weeks.
Specific to the sauna group : temperature in °C.
Temperature will be measured before and after each sauna session.
Measured: Up to 3 weeks.
Specific to the sauna group : heart rate in Beats Per Minute (BPM).
Heart rate will be measured continuously during each sauna session.
Measured: Up to 3 weeks.
Specific to the sauna group : sodium chloride concentration in sweat.
The concentration of sodium chloride in sweat will be measured during one sauna session per week (three measurements in total).
Measured: Up to 3 weeks.
Handgrip stenght test
Handgrip stenght will be measured using a dynamometer.
Measured: Day 1 and at the end of Week 3.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Mar 2026
- Study start23 Jun 2026
- Primary completion23 Sep 2027 (estimated)
- Study completion23 Sep 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Heart FailureStudies of the same condition, open and under way.
- More trials run by Central Hospital, Nancy, FranceThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- All included patients will undergo a 15-minute sauna session prior to randomization in order to assess sauna tolerance. In case of intolerance to the sauna, the patient will not be randomized and will not continue to participate in the study.
- Masking
- None (open label)
- Enrolment
- 46 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Central Hospital, Nancy, France
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, BAUDRY Guillaume, Central Hospital, Nancy, France
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07468344
- Sponsor's protocol ID
- 2025-A02089-40
- Acronym
- SAUNA-HF RCT
- Status last verified
- Oct 2026
- First submitted
- 12 Feb 2026
- Last updated
- 29 Oct 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 29 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Impact of Sauna Therapy on Congestion and Loop Diuretic Adjustment in Patients With Heart Failure
- ClinicalTrials.gov ID
- NCT07468344
- Acronym / sponsor ID
- SAUNA-HF RCT / 2025-A02089-40
- Conditions
- Heart Failure
- Keywords
- congestion, sauna, heart failure
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 46 participants (estimated)
- Lead sponsor
- Central Hospital, Nancy, FranceUniversity, hospital or other
- Study start
- 23 Jun 2026 (actual)
- Primary completion
- 23 Sep 2027 (estimated)
- Study completion
- 23 Sep 2027 (estimated)
- First posted
- 12 Mar 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study aims to evaluate the effect of sauna therapy on congestion levels during cardiac rehabilitation in patients with heart failure who have an impaired or moderately impaired ejection fraction, compared to standard cardiac rehabilitation care. To investigate this, patients with reduced cardiac function who are hospitalized as part of a cardiac rehabilitation program will be included. These patients will be randomly assigned to two groups: standard cardiac rehabilitation program (control group) and sauna group (intervention group). The study will also assess whether this approach could allow for a reduction in the dose of diuretics, which are commonly used to remove excess fluid, thereby helping to avoid certain side effects. The expected benefits include a reduction in symptoms such as shortness of breath and swelling, improvements in quality of life and physical fitness, and enhanced blood vessel function.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
- Model description
- All included patients will undergo a 15-minute sauna session prior to randomization in order to assess sauna tolerance. In case of intolerance to the sauna, the patient will not be randomized and will not continue to participate in the study.
| Arm | Type | Receives |
|---|---|---|
| Sauna | Experimental | Device: SaunaA 15-minute sauna session at 60 degrees Celsius during hospitalization for cardiac rehabilitation. |
| Control | No intervention | –Usual care as part of a day hospital stay for cardiac rehabilitation. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (10 listed)
- Age ≥ 18 years.
- Heart failure with ejection fraction <50% confirmed by an echocardiogram within the past year.
- NYHA class II-III.
- Loop diuretic dose ≥ 40 mg/day of furosemide (or equivalent) for at least 30 days.
- NT-proBNP > 400 pg/ml or BNP > 100 pg/ml.
Key exclusion criteria (8 listed)
- Person presenting a contraindication to sauna therapy (for example, intolerance to heat).
- Serum sodium < 130 mmol/L.
- Serum potassium > 5.5 mmol/L.
- Active infection, liver disease, or peripheral vascular disease.
- Acute coronary syndrome or recent stroke (<90 days).
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| SaunaA 15-minute sauna session at 60 degrees Celsius, five times a week for three weeks during hospitalization for cardiac rehabilitation. The sauna sessions will be followed by 30 minutes of recovery in a seated position. In addition to the sauna, patients will benefit from cardiac rehabilitation care for 3 weeks. | Device | Sauna |
Primary outcome
Median change in NT-proBNP levels.
Time frame: Between randomization and the end of the third week.
35 secondary outcomes
Daily dose of loop diuretics.
Time frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Weight in kilograms.
Time frame: Day 1, end of weeks 1,2 and 3, and 3-month follow-up.
Congestion score: ADVoR congestion score.
Time frame: Day 1, end of week 3, and 3-month follow-up.
Congestion score: Ambrosy congestion score.
Time frame: Day 1, end of week 3, and 3-month follow-up.
Estimated plasma volume (EPV): Duarte formula.
Time frame: Day 1, end of week 3, and 3-month follow-up.
Dyspnea visual analog scale: Cumulative dyspnea assessment (AUC).
Time frame: Day 1, beginning of weeks 2 and 3.
Concentration of natriuretic peptides (NT-proBNP).
Time frame: Day 1, end of week 1, beginning and end of week 2, beginning and end of week 3, and 3-month follow-up.
Evaluation of renal function through rate of serum creatinine allowing to estimate glomerular filtration rate.
Time frame: End of weeks 1, 2, and 3 and 3-month follow-up.
Evaluation of renal function through renal function assessment.
Time frame: Day 1 and end of week 3.
Dose of diuretics.
Time frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Concentration of serum electrolytes (Cl-, Na+, K+).
Time frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Blood osmolality in mmol/L.
Time frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Concentration of urinary electrolytes (Cl-, Na+, K+).
Time frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Urinary osmolality in mmol/L.
Time frame: Day 1, beginning and end of weeks 1, 2, and 3, and 3-month follow-up.
Hemoconcentration biomarkers : Hct.
Time frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Hemoconcentration biomarkers : Hb.
Time frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Hemoconcentration biomarkers : total protein.
Time frame: Time Frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Hemoconcentration biomarkers : copeptin.
Time frame: Time Frame: Day 1, end of weeks 1, 2, and 3, and 3-month follow-up.
Inferior vena cava diameter (millimeters, mm) measured by transthoracic echocardiography during inspiration.
Time frame: Day 1, end of week 1, beginning and end of week 2, beginning and end of week 3, and 3-month follow-up.
Inferior vena cava diameter (millimeters, mm) in expiration measured by transthoracic echocardiography during expiration.
Time frame: Day 1, end of week 1, beginning and end of week 2, beginning and end of week 3, and 3-month follow-up.
Inferior vena cava respiratory variation / collapsibility index (percentage, %) assessed by transthoracic echocardiography.
Time frame: Day 1, end of week 1, beginning and end of week 2, beginning and end of week 3, and 3-month follow-up.
Lung ultrasound score (8 points).
Time frame: Day 1, end of week 3, and 3-month follow-up.
Quantification of changes in systolic and diastolic function.
Time frame: Day 1 and 3-month follow-up.
Heart rate in Beats Per Minute (BPM).
Time frame: Multiple daily measurements : 4 times a day, 5 days a week for 3 weeks.
Heart rate variability in millisecond (ms).
Time frame: Multiple daily measurements : 4 times a day, 5 days a week for 3 weeks.
Blood pressure in mmHg.
Time frame: Up to 3 weeks and at 3-month follow-up.
Monitoring of changes in pulmonary blood pressure.
Time frame: Day 1 and at 3-month follow-up.
Composite clinical endpoint of hospitalization or emergency visits for heart failure or all-cause death.
Time frame: At 3-month follow-up.
Body composition parameters assessed by bioelectrical impedance analysis.
Time frame: Day 1, end of Week 1, beginning and end of Week 2, beginning and end of Week 3, and at 3-month follow-up.
Specific to the sauna group : weight in kilograms.
Time frame: Up to 3 weeks.
Specific to the sauna group : blood pressure in mmHg.
Time frame: Up to 3 weeks.
Specific to the sauna group : temperature in °C.
Time frame: Up to 3 weeks.
Specific to the sauna group : heart rate in Beats Per Minute (BPM).
Time frame: Up to 3 weeks.
Specific to the sauna group : sodium chloride concentration in sweat.
Time frame: Up to 3 weeks.
Handgrip stenght test
Time frame: Day 1 and at the end of Week 3.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 29 Oct 2026.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Sauna in people with Heart Failure, run by Central Hospital, Nancy, France at 1 site in France.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 10 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 29 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in France. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Nicolas Girerd (+33 03 83 15 74 96, n.girerd@chru-nancy.fr), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Median change in NT-proBNP levels. (time frame: Between randomization and the end of the third week.). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 Oct 2026.