Screening for Sleep Hypoxemia in Pulmonary Arterial Hypertension

Assistance Publique - Hôpitaux de Paris50 enrolled

Overview

In the investigators study, and regarding results of small cohorts in the literature, the investigators hypothesize that hypoxemia is frequent in IPAH and CPEPH. The investigators will explore these patients with a one night polysomnography and transcutaneous capnography, searching for hypoxemia and hypercapnia and by determining its physiopathologic mechanisms.

Pulmonary hypertension (PH) is a rare and severe disease of young adults, characterized by a progressive increase in pulmonary vascular resistances leading to cardiac failure and death. Patients with PH are categorized in two major groups: primary PH (PPH) wich is idiopathic, and secondary PH associated with many conditions such as chronic pulmonary embolic diseases (CPED).Increase in vascular resistance in PH is secondary to vasoconstriction and to a proliferative remodeling process of the arterial wall leading to obliteration of the small arterioles. On the other hand, hypoxemia is known to cause similar changes in vascular architecture. Also, some small cohorts study in the literature mentioned an increase of sleep hypoxemia prevalence accounting for almost 70% of cases. The mechanisms of this hypoxemia are completely unknown.Our study is observational, prospective and transversal, searching for hypoxemic respiratory sleep disorders (HRSD) in PPH and in CPEPH. Included patients will have one night polysomnography (CIDELEC) with a continuous measurement of transcutaneous PCO2.The major objectives are to determine the prevalence of HRSD, their physiopathologic mechanisms and their possible causal factors according to PH history, clinical findings and hemodynamic severity.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Sleep Disorders

Eligibility

Sex: ALLMin age: 18 YearsMax age: 75 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Patient aged 18 to 75 years * Patient with IPAH ot CPEPH stable for at least 3 months. Stability is defined by the New York Heart Association classes for dyspnea and the six minutes walking test (6MWT). Furthermore, no changes in medical therapy had occured during the last three months. * Patients who signed informed consent Exclusion Criteria: * Patients with secondary PH associated with other pathologies outside CPEPH ( sclerodermia, systemic lupus erythematous, portal hypertension, chronic HIV infection...) * Patients who had a functional and/or a hemodynamic degradation during the last 3 months or a change in pulmonary hypertension treatment * Patients with obstructive or restrictive ventilatory disorder with a Ventricular Ejection Fraction \<60% predicted * Women without effective contraception * Patients with a Body Mass Index above 35 kg/m2 * Patient not affiliated to a social security scheme

Locations (1)

Assistance Publique- Hôpitaux de Paris: Antoine Beclere Hospital

Clamart, France

Outcomes

Primary Outcomes

hypoxemia during the night

prevalence of nocturnal hypoxemia in IPAH and CPEPH

Time frame: at the inclusion

Secondary Outcomes

Predictors: physical, functional and hemodynamical data

Predictive factors of sleep hypoxemia in IPAH and CPEPH

Time frame: at the inclusion

Physiopathologic mechanisms: causes of nocturnal hypoxemia: hypoventilation, sleep disordered breathing, shunting, V/Q mismatch

Physiopathologic mechanisms of sleep hypoxemia in IPAH and CPEPH

Time frame: at the inclusion

Data from ClinicalTrials.gov

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