Effects of Lung Volume on Upper Airway Patency During Drug Induced Sleep Endoscopy
At a glance
Conditions
Where it's being run
1 sites across 1 statesStudy leadership
- Jason Yu, MD · PRINCIPAL_INVESTIGATOR · Emory University
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What this trial measures
- Expiratory Reserve Volume (ERV)During PFT
ERV is the volume of extra air that can be forcefully breathed out after exhaling normally. ERV is impacted by body size and altitude and the normal range for adults is about 0.7 to 1.1 liters (L). ERV is obtained as part of the pulmonary function test.
- Functional Residual Capacity (FRC)During PFT
FRC is the amount of air remaining in the lungs after a normal exhalation. FRC is impacted by body size and altitude and the normal volume for adults is about 1.8 to 2.4 L. FRC is obtained during the pulmonary function test and is the sum of residual volume (RV; the volume of air remaining after maximum exhalation) and ERV.
- Change in VOTE Collapse Patterns - Degree of ObstructionDuring clinical DISE and intervention DISE
VOTE collapse patterns are obtained during the routine clinical DISE evaluation and during DISE with negative pressure ventilation. The VOTE classification codes degree of obstruction as 0 = no obstruction (no vibration), 1 = partial obstruction (vibration), and 2 = complete obstruction (collapse). Degree of obstruction is determined the velum, oropharynx lateral walls, tongue base, and epiglottis. The measurements obtained without and with negative pressure ventilation will be compared.
- Change in VOTE Collapse Patterns - Configuration of ObstructionDuring clinical DISE and intervention DISE
VOTE collapse patterns are obtained during the routine clinical DISE evaluation and during DISE with negative pressure ventilation. The VOTE classification codes configuration of obstruction for structures with a degree of obstruction greater than 0. The configuration of obstruction is categorized as anteroposterior (anterior structures moving posteriorly against pharyngeal wall), lateral (lateral structures moving towards airway center), or concentric (both anteroposterior and lateral movements). The measurements obtained without and with negative pressure ventilation will be compared.
- Change in Critical Closing Pressure (Pcrit)During clinical DISE and intervention DISE
Critical closing pressures are obtained during the routine clinical DISE evaluation and during DISE with negative pressure ventilation. Pcrit assessed pharyngeal collapsibility and is measured as centimeters of water (cm H2O). A Pcrit of less than -10 cm H2O indicates normal breathing. Patients with a Pcrit around -6cm H2O tend to snore but not have OSA. A Pcrit around or greater than 0 cm H2O is seen with obstructive sleep apnea.The measurements obtained without and with negative pressure ventilation will be compared.
- Change in Pharyngeal Opening PressuresDuring clinical DISE and intervention DISE
Pharyngeal opening pressures are obtained during the routine clinical DISE evaluation and during DISE with negative pressure ventilation. Opening pressures are obtained using a positive airway pressure (PAP) titration device. Pharyngeal opening pressures are defined as the minimally effective positive airway pressure that results in non-flow limited breathing. This is measured in cm H2O and ranges from 0 to 25 cm H2O, with 25 cm H2O being the maximum pressure the PAP machine is capable of generating. The measurements obtained without and with negative pressure ventilation will be compared.