Nasal Ventilation Versus Voluntary Hypoventilation in the Rehabilitation of Hyperventilation Syndrome

Inclusion Criteria: * The patient must have given his / her free and informed consent and signed the consent * The patient must be a member or beneficiary of a health insurance program * The patient is available for 3 months of follow-up * The patient has at least two of the following clinical symptoms consistent with hyperventilation sydrome: dyspnea, chest pain or pressure, visual blurring, dizziness, a sensation of abdominal swelling, tingling in the fingers, stiffness in the fingers or arms, tingling sensation around the mouth, cold or moist hands, tension or anxiety * Resting hypocapnia defined by a PaCO2 \<38 mmHg and a normal O2 alveolo-arterial gradient D (A-a) O2 * Absence of significant obstructive or restrictive pathology according to respiratory function tests * Absence of indirect signs of pulmonary arterial hypertension according to echocardiography * Absence of alteration of gas exchange on maximum cardiopulmonary stress test (elevation of gradient D (A-a) O2 \> 35 mmHg at peak stress) * At least 2 of the following criteria: (i) a Nijmegen questionnaire score \> 23, (ii) the recurrence of at least two common symptoms during the maximum cardiopulmonary stress test, (iii) delayed return of PETCO2 (partial pressure of end-tidal carbon dioxide) to its basal value (\> 5 minutes) Exclusion Criteria: * The subject is participating in another study * The subject is in an exclusion period determined by a previous study * The subject is under judicial protection, or i…