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The Effect of Additive On-Demand Sildenafil vs. Dextrose Candy on Maximum Exercise Capacity in Pulmonary Arterial Hypertension (Pocket-PH)

12 septembre 2026 mis à jour par: Silvia Ulrich

The Effect of Additive On-Demand Sildenafil vs. Dextrose Candy on Maximum Exercise Capacity in Pulmonary Arterial Hypertension: A Randomized, Cross-Over Trial.

The goal of this clinical study is to investigate whether the additional intake of sildenafil 20mg on top of standard medical treatment results in a benefit on maximum exercise workload (Wmax) in patients with pulmonary arterial hypertension (PAH).

Aperçu de l'étude

Statut

Recrutement

Les conditions

Intervention / Traitement

Description détaillée

This study is a prospective, randomized, cross-over trial evaluating the effects of additive 20 mg sildenafil versus placebo/sham dextrose candy on exercise capacity in patients with previously diagnosed pulmonary arterial hypertension (PAH).

PAH is a progressive and debilitating disease characterized by increased mean pulmonary arterial pressure (mPAP) and pulmonary vascular resistance (PVR), leading to right ventricular overload, and ultimately right heart failure. Despite advancements in pharmacological therapy, treatment options remain limited and optimizing individualized approaches to improve exercise capacity and manage symptom burden remains a challenge.

Phosphodiesterase type 5 inhibitors, such as sildenafil, are cornerstones of PAH treatment, enhancing pulmonary vasodilation and improving haemodynamics. While three times daily dosing is standard with three time 20-80mg daily. On-demand additive sildenafil use before exercise has not been studied, but as recent trials have shown that dosing up to three times 80mg is as safe as 20mg, there is a potential that additive therapy may be beneficial. Given sildenafil's rapid onset of action with peak effects after 30-120 minutes, it may offer acute functional benefits regarding maximum workload (Wmax) when administered shortly beforehand, in the terms of a "pill-in-the pocket" intake.

After providing informed consent, eligible participants (aged 18 - 80 years, with PAH diagnosed according to the ESC/ERS 2022/2019 guidelines) will be randomly assigned to receive either 20 mg sildenafil or dextrose candy (Dextro Energy). 45 minutes post-intake, they will undergo incremental spiroergometry (10-20 W increases) and right heart focused stress-echocardiography on a cycle ergometer until exhaustion. After a rest phase of 30 minutes, patients will perform CWRET at 75% of achieved Wmax until exhaustion. Then, after a washout period of minimum 24 hours up to 12 weeks, participants will cross over to the opposite treatment, repeating the same protocol.

In case of a beneficial result, our study could support the use of an additive pill-in-the-pocket therapy strategy which may allow treatment to be tailored to the individual activity demands of patients.

Type d'étude

Interventionnel

Inscription (Estimé)

20

Phase

  • Phase 2
  • Phase 3

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

Sauvegarde des contacts de l'étude

  • Nom: Silvia Ulrich, Prof. MD
  • Numéro de téléphone: +41 44 255 22 21
  • E-mail: silvia.ulrich@usz.ch

Lieux d'étude

  • Suisse
    • Canton of Zurich
      • Zurich, Canton of Zurich, Suisse, 8091
        • Recrutement
        • University Hospital of Zurich, Department of Pulmonology
        • Contact:

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

  • Adulte
  • Adulte plus âgé

Accepte les volontaires sains

Non

La description

Inclusion Criteria:

  • Signed Informed consent
  • Age 18 - 80 years (both sexes)
  • Pulmonary hypertension (PH) class I (PAH) previously diagnosed according to ESC/ERS 2022/2019 guidelines (mPAP ≥ 20 mmHg, PVR ≥ 2 WU, PAWP ≤ 15 mmHg) during diagnostic right-heart catheterization.
  • Stable condition, on the same PH-medication for >4 weeks

Exclusion Criteria:

  • Severe resting hypoxia (PaO2 <7.3 kPa)
  • Moderate-to-severe chronic obstructive or restrictive pulmonary disease (FEV1 ≤ 60% predicted, FVC ≤ 60% predicted)
  • Women with known pregnancy or breast feeding
  • Other clinically significant concomitant disease states (e.g., severe renal or hepatic disease, unstable cardiovascular disease, etc.)

  • Concurrent medication with:

    • Nitric oxide donors (molsidomine, nicrorandil, etc.)
    • Soluble guanylate cyclase stimulators (riociguat)
    • Potent CYP3A4 inhibitors (azoles, clarithromycin, protease inhibitors)
  • History of anterior ischemic optic neuropathy or hereditary retinal disease
  • Participation in another study with investigational drug with potential influence the study data within the 30 days preceding and during the present study.
  • Known allergies or hypersensitivity to sildenafil 20mg (Revatio 20mg) or dextrose candy (Dextroenergy) including any of its components

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Traitement
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation croisée
  • Masquage: Seul

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Autre: Intervention Order A
Group A will receive the active comparator first (Sildenafil 20mg) in accordance with the Cross-Over trial design.
Médicament: Dextrose
Administration of Dextrose Candy by mouth as a tablet.
Autres noms:
  • Dextro Energy
  • Dextrose Candy
Médicament: Sildenafil 20mg
Administration of Sildenafil 20mg by mouth as a tablet.
Autres noms:
  • Revatio 20mg
Autre: Intervention Order B
Group B will receive the placebo comparator first (Dextrose Candy) in accordance with the Cross-Over trial design.
Médicament: Dextrose
Administration of Dextrose Candy by mouth as a tablet.
Autres noms:
  • Dextro Energy
  • Dextrose Candy
Médicament: Sildenafil 20mg
Administration of Sildenafil 20mg by mouth as a tablet.
Autres noms:
  • Revatio 20mg

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Maximum workload (Wmax)
Délai: Within 1 - 90 days
The difference in maximum workload (Wmax) attained during maximum spiroergometry 45 minutes after treatment with Sildenafil 20mg (Revatio 20mg) versus dextrose candy (Dextro Energy).
Within 1 - 90 days

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Time to Exhaustion (Tmax)
Délai: Within 1 - 90 days
Difference in Time to Exhaustion (Tmax)attained during CWRET after treatment with Sildenafil 20mg (Revatio 20mg) versus dextrose candy (Dextro Energy)
Within 1 - 90 days
Cardiometabolic parameters (CPET, CWRET): Oxygen Saturation (SpO2)
Délai: Within 1 - 90 days
Change in Oxygen Saturation (SpO2) during CPET / CWRET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Stroke Volume (SV)
Délai: Within 1 - 90 days
Change in Stroke Volume (SV) during CPET
Within 1 - 90 days
Arterial blood gases: Arterial Partial Pressure of Oxygen (PaO2)
Délai: Within 1 - 90 days
Change in Arterial Partial Pressure of Oxygen (PaO2) during CPET.
Within 1 - 90 days
Borg CR10 (Borg Category-Ratio 10 Scale)
Délai: Within 1 - 90 days
Changes in Borg CR10 questionnaire (Borg Category-Ratio 10 Scale) after CPET / CWRET (0-10, higher values indicate more severe symptoms)
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Tricuspid Regurgitation Pressure Gradient (TRPG)
Délai: Within 1 - 90 days
Change in Tricuspid Regurgitation Pressure Gradient (TRPG) during CPET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Blood Pressure (BP)
Délai: Within 1 - 90 days
Change in Blood Pressure (BP) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Heart Rate (HR)
Délai: Within 1 - 90 days
Change in Heart Rate (HR) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Rate Pressure Product (RPP)
Délai: Within 1 - 90 days
Change in Rate Pressure Product (RPP) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Maximum Uptake of Oxygen (V'O2max)
Délai: Within 1 - 90 days
Change Maximum Uptake of Oxygen (V'O2max) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Maximum Carbon Dioxide Production (V'CO2max)
Délai: Within 1 - 90 days
Change in Maximum Carbon Dioxide Production (V'CO2max) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Maximum Minute Ventilation (V'Emax)
Délai: Within 1 - 90 days
Change in Maximum Minute Ventilation (V'Emax) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Maximum Ventilatory Equivalent for Oxygen (V'E/VO2)
Délai: Within 1 - 90 days
Change in Maximum Ventilatory Equivalent for Oxygen (V'E/VO2) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Maximum Ventilatory Equivalent for Carbon Dioxide (V'E/VCO2)
Délai: Within 1 - 90 days
Change in Maximum Ventilatory Equivalent for Carbon Dioxide (V'E/VCO2) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Breathing Frequency (BF)
Délai: Within 1 - 90 days
Change in Breathing Frequency (BF) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Breathing Reserve (BR)
Délai: Within 1 - 90 days
Change in Breathing Reserve (BR) during CPET / CWRET
Within 1 - 90 days
Arterial blood gases: Arterial Partial Pressure of Carbon Dioxide (PaCO2)
Délai: Within 1 - 90 days
Change in Arterial Partial Pressure of Carbon Dioxide (PaCO2) during CPET.
Within 1 - 90 days
Arterial blood gases: Bicarbonate (HCO3-)
Délai: Within 1 - 90 days
Change in Bicarbonate HCO3- before and after CPET.
Within 1 - 90 days
Arterial blood gases: Arterial Oxygen Saturation (SaO2)
Délai: Within 1 - 90 days
Change in Arterial Oxygen Saturation (SaO2) before and after CPET.
Within 1 - 90 days
Arterial blood gases: Base Excess (BE)
Délai: Within 1 - 90 days
Change in Base Excess (BE) before and after CPET.
Within 1 - 90 days
Arterial blood gases: Lactate (lac)
Délai: Within 1 - 90 days
Change in Lactate (lac) concentration before and after CPET.
Within 1 - 90 days
Arterial blood gases: Hemoglobin (Hb)
Délai: Within 1 - 90 days
Change in Hemoglobin (Hb) before and after CPET.
Within 1 - 90 days
Arterial blood gases: Hematocrit (Hct)
Délai: Within 1 - 90 days
Change in Hematocrit (Hct) before and after CPET.
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Tricuspid Regurgitation Velocity (TRV)
Délai: Within 1 - 90 days
Change in Tricuspid Regurgitation Velocity (TRV) during CPET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Right Atrial Pressure (RAP)
Délai: Within 1 - 90 days
Change in Right Atrial Pressure (RAP) during CPET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Systolic Pulmonary Arterial Pressure (sPAP)
Délai: Within 1 - 90 days
Change in Systolic Pulmonary Arterial Pressure (sPAP) during CPET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Fractional Area Change (FAC)
Délai: Within 1 - 90 days
Change in Fractional Area Change (FAC) during CPET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Tricuspid Annular Plane Systolic Excursion (TAPSE)
Délai: Within 1 - 90 days
Change in Tricuspid Annular Plane Systolic Excursion (TAPSE) during CPET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Ratio of Tricuspid Regurgitation Pressure Gradient to Cardiac Output (TRPG/CO)
Délai: Within 1 - 90 days
Change in Ratio of Tricuspid Regurgitation Pressure Gradient to Cardiac Output (TRPG/CO) during CPET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Cardiac Output (CO)
Délai: Within 1 - 90 days
Change in Cardiac Output (CO) during CPET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Pulmonary Vascular Resistance (PVR)
Délai: Within 1 - 90 days
Change in Pulmonary Vascular Resistance (PVR) during CPET
Within 1 - 90 days

Autres mesures de résultats

Mesure des résultats
Description de la mesure
Délai
Safety Profile / (S)AEs
Délai: (S)AEs will be assessed immediately after each intervention (A or B) during the corresponding study visits (1 and 2).
Safety and (S)AEs of each Intervention [sildenafil 20mg (Revatio 20mg) and dextrose candy (Dextro Energy)] will be assessed.
(S)AEs will be assessed immediately after each intervention (A or B) during the corresponding study visits (1 and 2).

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Silvia Ulrich

Les enquêteurs

  • Chercheur principal: Silvia Ulrich, Prof. Dr. med., University of Zurich
  • Chercheur principal: Arcangelo F Carta, Dr. med., University of Zurich

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

1 septembre 2026

Achèvement primaire (Estimé)

1 avril 2028

Achèvement de l'étude (Estimé)

1 décembre 2028

Dates d'inscription aux études

Première soumission

17 août 2026

Première soumission répondant aux critères de contrôle qualité

12 septembre 2026

Première publication (Réel)

17 septembre 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

17 septembre 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

12 septembre 2026

Dernière vérification

1 septembre 2026

Plus d'information

Termes liés à cette étude

Mots clés

Termes MeSH pertinents supplémentaires

Autres numéros d'identification d'étude

  • KEK-ZH-Nr. 2025-02557

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

NON

Description du régime IPD

Access to anonymised IPD that underlie results in a publication will be considered individually upon reasonable request.

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

produit fabriqué et exporté des États-Unis.

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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