This trial is active, not recruiting.

Condition obstructive sleep apnea syndrome
Sponsor University of Sao Paulo General Hospital
Start date May 2009
End date December 2010
Trial size 50 participants
Trial identifier NCT01210703, AcPh.1


Acoustic Pharyngometry (AP) is a method of measurement of Transversal Sectional Areas (TSA) and Volumes of oral cavity and pharynx, based on acoustic waves. The aim of this study is to describe changes on oropharynx dimensions caused by CPAP (Continuous Positive Air Pressure) in patients with severe Obstructive Sleep Apnea Syndrome when compared with patients with Primary Snore, using AP. The exam will be made during the use of CPAP, at various pressures. The investigators also intend to determine if pressure determined by Polysomnography in OSAS patients cause some type of different change in AP graphic.

United States No locations recruiting
Other Countries No locations recruiting

Study Design

Observational model case control
Time perspective cross-sectional

Eligibility Criteria

Male or female participants from 18 years up to 65 years old.

Inclusion Criteria: - Age: 18 - 65 years old - Female and male Exclusion Criteria: - Cardiopathies - Chronic nasal obstruction - Using neurologic or psychiatric drugs

Additional Information

Official title Evaluation of Effect of Continuous Positive Air Pressure (CPAP) on Upper Airway Dimensions, by Acoustic Pharyngometry (AP), in Severe Obstructive Sleep Apnea Syndrome (OSAS) and Primary Snore Patients
Principal investigator Claudia Inês G de Sousa Silva, Md
Description The investigators are performing AP exams in severe apneics (cases) and primary snorers (control group),first basal, and then at the same time of using CPAP with a nasal mask, at progressive pressures (from 4 to 10 cmH20 in snorers, and until 2 pressures above the polysomnography determined pressure in apneics). The wave tube of pharyngometer is connected to the patient´s mouth by a mouthpiece, and to the computer. It makes a graphic of area x distance for each measurement. Then the investigators compare the changes in area, distance and volume of oral cavity and pharynx, determined by CPAP pressures, in both groups, and compare the measurements inside each group and between the two groups. Finally, the investigators analyse the CPAP pressure that most modifies the AP graphic, observing if it has some relationship with the polysomnography determined CPAP pressure. The investigators intend this way to show the kind of modifies determined by CPAP in oral cavity and oropharynx and, secondarily, observe some relationship of AP and polysomnography in determine the CPAP ideal pressure for severe apneic patients.
Trial information was received from ClinicalTrials.gov and was last updated in October 2010.
Information provided to ClinicalTrials.gov by University of Sao Paulo General Hospital.