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Pulmonary HypertensionPhase 2NCT05699486

A Study to Evaluate the Efficacy, Safety and Tolerability of PDNO Infusion in Patients With Pulmonary Hypertension After Cardiopulmonary Bypass Surgery

A Phase 2 study testing PDNO in people with Pulmonary Hypertension, run by Attgeno AB at 2 sites in Sweden.

Unknown status

Status not confirmed. The sponsor has not verified this record for over two years, so it may be out of date.

Official record
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Trial summary

This is an open-label, multicenter study evaluating the dose, effect, safety and tolerability of intravenous PDNO infusion given to patients undergoing cardiopulmonary bypass (CPB) surgery with post-operative acute pulmonary hypertension (aPH). Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Pulmonary Hypertension
What is being tested?
PDNO
Type of treatment
Injection or infusion
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
12 participants
Where
2 sitesSweden
Study dates
23 Oct 2022to 31 Dec 2023
Phase
Phase 2
Are there results?
None posted in the registry

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

  • Ability to understand and willing to sign an informed consent form (ICF)
  • Male and female patients, age ≥ 18 years
  • Planned to undergo elective cardiopulmonary bypass (CPB) for coronary artery bypass grafting (CABG), aortic valve repair (AVR) or mitral valve repair (MVR) with or without CABG
  • Diagnosed with echocardiographic signs of pulmonary artery systolic pressure (PASP) >50 mmHg , as estimated by doppler defined echocardiography using a modified Bernoulli equation: PASP ≈ 4 (tricuspid regurgitant jet velocity)^2 + central venous pressure (CVP)

Who cannot join

  • History of chronic pulmonary hypertension (PH) (WHO group 1, 3, 4 or 5), not group 2 due to left heart disease
  • Patients with contraindications for pulmonary artery catheter (PAC)
  • History of severe chronic obstructive pulmonary disease
  • Left heart failure with ejection fraction (EF) <35%
  • Non-ST elevation myocardial infarction (non-STEMI) or ST elevation myocardial infarction (STEMI) within 1 months prior to informed consent
  • Stroke (cerebrovascular lesion [CVL]), transient ischemic attack (TIA), AV block III within 3 months prior to informed consent or QTcF >450ms at the time of screening
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  • High inotropic requirement (no more than one inotrope treatment and the vasopressor norepinephrine at time of screening/postoperative evaluation)
  • (Increased) mediastinal bleeding >100 mL/hour in mediastinal drainage at postoperative evaluation
  • Mechanical circulatory assistance (intra aortic balloon pump [IABP] or right/left-ventricular assist device [R/L VAD])
  • Echocardiographic evidence of significant tricuspid insufficiency
  • Body Mass Index (BMI) >40 kg/m^2
  • Estimated glomerular filtration rate (eGFR) < 30 mL/min preoperative value
  • Methemoglobin >3%
  • Indication of liver disease, defined by serum levels of either alanine aminotransferase (ALT), aspartate aminotransferase (AST) or alkaline phosphatase (ALP) above 3 x upper limit of normal (ULN) (preoperative value)
  • Preoperative haemoglobin <10 g/dL, postoperative: Hb < 9 g/dL
  • Thrombocytopenia (platelet count <100,000/mm^3), preoperative value
  • Prothrombin time International ratio (INR) > 1.3, preoperative value
  • Pregnant or lactating women, or with a positive pregnancy test at screening (for fertile women only)
  • Ongoing daily treatment the last 3 days with non-steroidal anti-inflammatory drugs (NSAIDs, excluding low dose, i.e. 75 mg, acetylsalicylic acid), new oral anticoagulants (NOACs), warfarin, heparin, clopidogrel (last 5 days). Low molecular weight heparin (LMWH) is not an exclusion criterion. Any use of PDE5 inhibitors (sildenafil, tadalafil, vardenafil and avanafil) within 48 hours prior to the administration of PDNO.
  • Known active malignancy within the past 3 years except for localized prostate cancer, cervical carcinoma in situ, breast cancer in situ, or nonmelanoma skin cancer that has been definitively treated
  • History of allergy/hypersensitivity to PD or ongoing allergy/hypersensitivity or history of hypersensitivity to drugs with a similar chemical structure or class to PDNO
  • History of any other clinically significant disease or disorder
  • Participation in any interventional clinical study or has been treated with any investigational research products within 30 days or 5 half-lives, whichever is longer, prior to the initiation of screening

Trial locations and contacts

2 sites in 1 country.

Christofer Adding, MD/PhD contact

+46 (0) 70 788 67 66

christofer.adding@attgeno.com

Sweden2 sites, 2 recruiting
  • Sahlgrenska University Hospital, Anaesthesiology and Intensive Care

    Gothenburg, SE-413 45

    Sven-Erik Ricksten, MD

    Recruiting
  • Örebro University Hospital, Vascular and Thoracic Department (Kärl-Thoraxkliniken)

    Örebro, SE-701 85

    Jenny Seilitz, MD

    Recruiting

Other trials in Sweden

About this study

Official title: An Open-Label, Multicenter Study To Evaluate the Dose, Efficacy, Safety and Tolerability of PDNO (Nitrosooxypropanol) Infusion in Patients With Pulmonary Hypertension After Cardiopulmonary Bypass (CPB) Surgery for Coronary Artery Bypass Grafting (CABG) or Mitral or Aortic Valve Repair or Replacement With or Without CABG

This is an open-label, multicenter study evaluating the dose, effect, safety and tolerability of intravenous PDNO infusion given to patients undergoing cardiopulmonary bypass (CPB) surgery with post-operative acute pulmonary hypertension (aPH).

Being tested
PDNO, Sodium chloride (placebo)
Keywords
Acute pulmonary hypertension
Medical subject headings
Hypertension, Pulmonary

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • PDNODrug

    Also called Nitrosooxypropanol

    PDNO consists of propylene glycol (1,2-propanediol, PD) chemically combined with NO (to be donated). The drug substance is formulated as an inherent mixture of 4 structure analogues. The mixture consists of an equilibrium of the 2 regioisomers 1-(nitrosooxy) propan-2-ol and 2-(nitrosooxy) propan-1-ol. In addition, each regioisomer is a racemic mixture.

  • Sodium chloride (placebo)Drug

    Also called NaCl

    Placebo (NaCl, commercially available dilution solution for parenteral use, 9 mg/mL)

Study groups in NCT05699486
Study groupRoleWhat they receive
Treatment with PDNO (placebo during baseline and washout observation periods before & after PDNO)ExperimentalPDNO will be administered as an incremental intravenous infusion of respectively 15 minutes with the planned dosage: 3, 10, 30, 45 and 60 nmol/kg/min. If no effect on MPAP/PVR is seen at 60 nmol/kg/min in the first patients treated, further dose escalation up to 120 nmol/kg/min is possible, if recommended by the Internal Safety Review Committe (iSRC) following careful review of collected safety data. The iSRC will in any case review all collected data after 4, 8 and 12 patients (if applicable also after 16 and 20 patients). PDNO is administered together with a carrier buffer (NaHCO3-) flow into a central venous catheter. Placebo (NaCl, commercially available dilution solution for parenteral use, 9 mg/mL) will be administered during the baseline and washout observation periods before and after start of IMP infusion.
Receives: Drug: PDNO; Drug: Sodium chloride (placebo)

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Mean change in pulmonary vascular resistance (PVR)

    PVR, will be derived as the mean pulmonary artery pressure (MPAP) - pulmonary capillary wedge pressure (PCWP) divided by cardiac output (CO), (PVR=(MPAP-PCWP)/CO), as measured with a pulmonary artery catheter (PAC) including thermodilution-determined cardiac output. Assessments will be done at the following timepoints: T0 (-15 minutes) and T1 (0 minutes) with placebo; T2 (15 minutes), T3 (30 minutes), T4 (45 minutes), T5 (60 minutes), and T6 (75 minutes) with 3, 10, 30, 45, 60 nmol/kg/min with PDNO, respectively; and T7 (85 minutes) and T8 (95 minutes) with placebo.

    Measured: From baseline (mean of -15 minutes and 0 minutes) to time point 15, 30, 45, 60, and 75 minutes with PDNO, respectively; and 85 and 95 minutes with placebo.

Secondary outcomes (9)
  1. Mean change in the pulmonary vascular resistance/systemic vascular resistance ratio (PVR/SVR ratio)

    PVR, will be derived as the mean pulmonary artery pressure (MPAP) - pulmonary capillary wedge pressure (PCWP) divided by cardiac output (CO), (PVR=(MPAP-PCWP)/CO), as measured with a pulmonary artery catheter (PAC) including thermodilution-determined cardiac output.

    SVR is determined from mean pulmonary artery pressure - central venous pressure divided by cardiac output (CO), (SVR=(MABP-CVP)/CO).

    Assessments will be done at the following timepoints: T0 (-15 minutes) and T1 (0 minutes) with placebo; T2 (15 minutes), T3 (30 minutes), T4 (45 minutes), T5 (60 minutes), and T6 (75 minutes) with 3, 10, 30, 45, 60 nmol/kg/min with PDNO, respectively; and T7 (85 minutes) and T8 (95 minutes) with placebo.

    Measured: From baseline (mean of -15 minutes and 0 minutes) to time point 15, 30, 45, 60, and 75 minutes with PDNO, respectively; and 85 and 95 minutes with placebo.

  2. Mean change in fractional area change (FAC)

    Assessments will be done at the following timepoints: T0 (-15 minutes) and T1 (0 minutes) with placebo; T2 (15 minutes), T3 (30 minutes), T4 (45 minutes), T5 (60 minutes), and T6 (75 minutes) with 3, 10, 30, 45, 60 nmol/kg/min with PDNO, respectively; and T7 (85 minutes) and T8 (95 minutes) with placebo.

    Measured: From baseline (mean of -15 minutes and 0 minutes) to time point 15, 30, 45, 60, and 75 minutes with PDNO, respectively; and 85 and 95 minutes with placebo.

  3. Mean change in tricuspidannular plane systolic excursion (TAPSE)

    Assessments will be done at the following timepoints: T0 (-15 minutes) and T1 (0 minutes) with placebo; T2 (15 minutes), T3 (30 minutes), T4 (45 minutes), T5 (60 minutes), and T6 (75 minutes) with 3, 10, 30, 45, 60 nmol/kg/min with PDNO, respectively; and T7 (85 minutes) and T8 (95 minutes) with placebo.

    Measured: From baseline (mean of -15 minutes and 0 minutes) to time point 15, 30, 45, 60, and 75 minutes with PDNO, respectively; and 85 and 95 minutes with placebo.

  4. Mean change in right ventricular (RV) free wall strain

    Assessments will be done at the following timepoints: T0 (-15 minutes) and T1 (0 minutes) with placebo; T2 (15 minutes), T3 (30 minutes), T4 (45 minutes), T5 (60 minutes), and T6 (75 minutes) with 3, 10, 30, 45, 60 nmol/kg/min with PDNO, respectively; and T7 (85 minutes) and T8 (95 minutes) with placebo.

    Measured: From baseline (mean of -15 minutes and 0 minutes) to time point 15, 30, 45, 60, and 75 minutes with PDNO, respectively; and 85 and 95 minutes with placebo.

  5. Safety and tolerability of PDNO in patients undergoing Cardiopulmonary Bypass (CPB) surgery

    Measured by incidence of: treatment-emergent adverse events (AEs), treatment-emergent serious AEs (SAEs), treatment-emergent AEs of special interest (AESI), treatment-emergent changes in vital signs (blood pressure, pulse, oxygen saturation, respiratory frequency, body temperature), treatment-emergent electrocardiogram (ECG) abnormalities, and treatment-emergent laboratory abnormalities.

    Measured: Until study end (i.e., end of Day 1 [95 minutes]). All AEs (including SAEs) will be collected from the initiation of any study specific procedure, starting when postoperative preparatory preparations are performed on Day 1 and until the end of the study.

  6. Exposure parameters for 1,2-propanediol (PD): estimated area under the curve from time 0 to time t (AUC0-t)

    To assess the exposure of PD.

    Measured: Assessments at time points T0 (-15 minutes; placebo), T6 (75 minutes; PDNO), and T8 (95 minutes; placebo).

  7. Exposure parameters for 1,2-propanediol (PD): estimated area under the curve from time 0 to infinity (AUC0-inf)

    To assess the exposure of PD.

    Measured: Assessments at time points T0 (-15 minutes; placebo), T6 (75 minutes; PDNO), and T8 (95 minutes; placebo).

  8. Exposure parameters for 1,2-propanediol (PD): maximum plasma concentration (Cmax)

    To assess the exposure of PD.

    Measured: Assessments at time points T0 (-15 minutes; placebo), T6 (75 minutes; PDNO), and T8 (95 minutes; placebo).

  9. Exposure parameters for 1,2-propanediol (PD): estimated elimination half life (t½)

    To assess the exposure of PD.

    Measured: Assessments at time points T0 (-15 minutes; placebo), T6 (75 minutes; PDNO), and T8 (95 minutes; placebo).

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted26 Jan 2023
  2. Study start23 Oct 2022
  3. Primary completion31 Dec 2023 (estimated)
  4. Study completion31 Dec 2023 (estimated)

Resources

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 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
12 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05699486
Sponsor's protocol ID
2021-PDNO-003
Other IDs
2021-005032-30
Status last verified
Jul 2023
First submitted
19 Dec 2022
Last updated
1 Aug 2023
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing PDNO in people with Pulmonary Hypertension, run by Attgeno AB at 2 sites in Sweden.

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 4 inclusion and 23 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: status not confirmed, as of the sponsor's last update on 1 Aug 2023. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 2 sites in Sweden. 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.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Results are not available in the source record.

How can a doctor refer a patient or contact the research team?

Contact Christofer Adding, MD/PhD (+46 (0) 70 788 67 66, christofer.adding@attgeno.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Mean change in pulmonary vascular resistance (PVR) (time frame: From baseline (mean of -15 minutes and 0 minutes) to time point 15, 30, 45, 60, and 75 minutes with PDNO, respectively; and 85 and 95 minutes with placebo.). 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 1 Aug 2023.

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