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

2026年9月12日 更新者：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).

調査の概要

状態

募集

条件

介入・治療

詳細な説明

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.

研究の種類

介入

入学 (推定)

20

段階

  • フェーズ2
  • フェーズ 3

連絡先と場所

このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。

研究連絡先

研究連絡先のバックアップ

研究場所

  • スイス
    • Canton of Zurich
      • Zurich、Canton of Zurich、スイス、8091
        • 募集
        • University Hospital of Zurich, Department of Pulmonology
        • コンタクト：

参加基準

研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。

適格基準

就学可能な年齢

  • 大人
  • 高齢者

健康ボランティアの受け入れ

いいえ

説明

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

研究計画

このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。

研究はどのように設計されていますか？

デザインの詳細

  • 主な目的：処理
  • 割り当て：ランダム化
  • 介入モデル：クロスオーバー割り当て
  • マスキング：独身

武器と介入

参加者グループ / アーム
介入・治療
他の：Intervention Order A
Group A will receive the active comparator first (Sildenafil 20mg) in accordance with the Cross-Over trial design.
薬：Dextrose
Administration of Dextrose Candy by mouth as a tablet.
他の名前：
  • Dextro Energy
  • Dextrose Candy
薬：Sildenafil 20mg
Administration of Sildenafil 20mg by mouth as a tablet.
他の名前：
  • Revatio 20mg
他の：Intervention Order B
Group B will receive the placebo comparator first (Dextrose Candy) in accordance with the Cross-Over trial design.
薬：Dextrose
Administration of Dextrose Candy by mouth as a tablet.
他の名前：
  • Dextro Energy
  • Dextrose Candy
薬：Sildenafil 20mg
Administration of Sildenafil 20mg by mouth as a tablet.
他の名前：
  • Revatio 20mg

この研究は何を測定していますか？

主要な結果の測定

結果測定
メジャーの説明
時間枠
Maximum workload (Wmax)
時間枠：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

二次結果の測定

結果測定
メジャーの説明
時間枠
Time to Exhaustion (Tmax)
時間枠：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)
時間枠：Within 1 - 90 days
Change in Oxygen Saturation (SpO2) during CPET / CWRET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Stroke Volume (SV)
時間枠：Within 1 - 90 days
Change in Stroke Volume (SV) during CPET
Within 1 - 90 days
Arterial blood gases: Arterial Partial Pressure of Oxygen (PaO2)
時間枠：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)
時間枠：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)
時間枠：Within 1 - 90 days
Change in Tricuspid Regurgitation Pressure Gradient (TRPG) during CPET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Blood Pressure (BP)
時間枠：Within 1 - 90 days
Change in Blood Pressure (BP) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Heart Rate (HR)
時間枠：Within 1 - 90 days
Change in Heart Rate (HR) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Rate Pressure Product (RPP)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：Within 1 - 90 days
Change in Breathing Frequency (BF) during CPET / CWRET
Within 1 - 90 days
Cardiometabolic parameters (CPET / CWRET): Breathing Reserve (BR)
時間枠：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)
時間枠：Within 1 - 90 days
Change in Arterial Partial Pressure of Carbon Dioxide (PaCO2) during CPET.
Within 1 - 90 days
Arterial blood gases: Bicarbonate (HCO3-)
時間枠：Within 1 - 90 days
Change in Bicarbonate HCO3- before and after CPET.
Within 1 - 90 days
Arterial blood gases: Arterial Oxygen Saturation (SaO2)
時間枠：Within 1 - 90 days
Change in Arterial Oxygen Saturation (SaO2) before and after CPET.
Within 1 - 90 days
Arterial blood gases: Base Excess (BE)
時間枠：Within 1 - 90 days
Change in Base Excess (BE) before and after CPET.
Within 1 - 90 days
Arterial blood gases: Lactate (lac)
時間枠：Within 1 - 90 days
Change in Lactate (lac) concentration before and after CPET.
Within 1 - 90 days
Arterial blood gases: Hemoglobin (Hb)
時間枠：Within 1 - 90 days
Change in Hemoglobin (Hb) before and after CPET.
Within 1 - 90 days
Arterial blood gases: Hematocrit (Hct)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：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)
時間枠：Within 1 - 90 days
Change in Cardiac Output (CO) during CPET
Within 1 - 90 days
Focused Stress-Echocardiography (Right Heart): Pulmonary Vascular Resistance (PVR)
時間枠：Within 1 - 90 days
Change in Pulmonary Vascular Resistance (PVR) during CPET
Within 1 - 90 days

その他の成果指標

結果測定
メジャーの説明
時間枠
Safety Profile / (S)AEs
時間枠：(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).

協力者と研究者

ここでは、この調査に関係する人々や組織を見つけることができます。

スポンサー

Silvia Ulrich

捜査官

  • 主任研究者：Silvia Ulrich, Prof. Dr. med.、University of Zurich
  • 主任研究者：Arcangelo F Carta, Dr. med.、University of Zurich

研究記録日

これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。

主要日程の研究

研究開始 (推定)

2026年9月1日

一次修了 (推定)

2028年4月1日

研究の完了 (推定)

2028年12月1日

試験登録日

最初に提出

2026年8月17日

QC基準を満たした最初の提出物

2026年9月12日

最初の投稿 (実際)

2026年9月17日

学習記録の更新

投稿された最後の更新 (実際)

2026年9月17日

QC基準を満たした最後の更新が送信されました

2026年9月12日

最終確認日

2026年9月1日

詳しくは

本研究に関する用語

キーワード

追加の関連 MeSH 用語

その他の研究ID番号

  • KEK-ZH-Nr. 2025-02557

個々の参加者データ (IPD) の計画

個々の参加者データ (IPD) を共有する予定はありますか?

いいえ

IPD プランの説明

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

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米国FDA規制医薬品の研究

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米国FDA規制機器製品の研究

いいえ

米国で製造され、米国から輸出された製品。

いいえ

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