Acute Exposure of Simulated Hypoxia on Pulmonary Artery Pressure and Right Heart Function (Echo)

University of Zurich (UZH) logo

University of Zurich (UZH)

Status

Completed

Conditions

Pulmonary Hypertension

Treatments

Device: Shamed Hypoxia (FiO2: 20.9)
Device: Simulated Altitude (FiO2: 15.1%)

Study type

Interventional

Funder types

Other

Identifiers

NCT03637088
2018-00455_A2

Details and patient eligibility

About

Randomized crossover trial in patients with Pulmonary Hypertension (PAH, CTEPH) to assess the acute response to simulated altitude (FiO2:15.1, equivalent to 2500m above sea level) on pulmonary artery pressure and right heart function (Echo).

Full description

Low altitude baseline measurements will be performed in Zurich (460m asl) including Echocardiography, Right heart catheterization, (six-minute walk test) 6MWT, pulmonary function test, clinical assessment and blood gas Analysis. Randomly assigned to the order of testing, the participants will be tested under simulated altitude (FiO2: 15.1% with the "AMC Altitrainer") and shamed altitude with the same device. Several times within the exposure, the pulmonary artery pressure and the right heart function will be assessed by echo.

Enrollment

28 patients

Sex

All

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

  • Informed consent
  • PH diagnosed according to internation Guidelines: mean pulmonary artery pressure (mPAP) ≥ 25 mmHg along with a (pulmonary artery wedge pressure) PAWP ≤15 mmHg during right heart catheterization at the time of initial diagnosis
  • PH class 1 (PAH) or 4 (CTEPH)
  • Stable condition, on the same medication for > 4 weeks
  • Patient live permanently at an altitude < 1000m asl.

Exclusion criteria

  • Resting partial Oxygen pressure (PaO2) ≤7.3 kilopascal (kPA) corresponding to the requirement of long-term oxygen therapy > 16hour daily (nocturnal oxygen therapy alone is allowed)
  • Severe daytime hypercapnia (pCO2 > 6.5 kPa)
  • Susceptibility to high altitude related diseases (AMS, high-altitude pulmonary edema (HAPE), etc.) based on previous experienced discomfort at altitudes.
  • Exposure to an altitude >1500m for ≥3 nights during the last 4 weeks before the study participation
  • Residence > 1000m above sea level
  • Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, neurological or orthopedic problems with walking disability
  • Women who are pregnant or breast feeding

Trial design

Primary purpose

Prevention

Allocation

Randomized

Interventional model

Crossover Assignment

Masking

Single Blind

28 participants in 2 patient groups

Order air-hypoxia
Experimental group
Description:
The participants will be exposed to shamed hypoxia (FiO2: 20.9% equivalent to sea level and consecutively to simulated altitude (FiO2: 15.1% equivalent to 2500m above sea level) administered by an altitude Simulator ("Altitrainer, SMTEC"), simulated altitude (FiO2: 15.1%), with a facemask.
Treatment:
Device: Simulated Altitude (FiO2: 15.1%)
Device: Shamed Hypoxia (FiO2: 20.9)
Order hypoxia-air
Experimental group
Description:
The participant will be exposed to hypoxia (FiO2, 15.1% equivalent to 2500m above sea level), simulated altitude (FiO2: 15.1%), and consecutively to shamed hypoxia (FiO2, 20.9%) administered by an altitude simulator ("Altitrainer, SMTEC") with a facemask.
Treatment:
Device: Simulated Altitude (FiO2: 15.1%)
Device: Shamed Hypoxia (FiO2: 20.9)

Trial contacts and locations

1

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Data sourced from clinicaltrials.gov

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