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Effects of Continuous Airway Pressure on the Ability to Heat and Humidify Air

2014-08-27 03:44:07 | BioPortfolio

Summary

We hypothesize that continuous positive pressure applied to the airway will decrease the ability of the nose to warm and humidify inspired air compared to zero or negative pressure.

We will use continuous positive airway pressure (CPAP), a device commonly used to treat patients with sleep apnea, to vary the pressure in the airway and determine if increased pressure decreases the ability to warm and humidify inspired air. If our hypothesis is correct, it may explain the reason why CPAP is poorly tolerated in patients with sleep apnea; i.e., less ability to warm and humidify air leading to more nasal mucosal irritation.

Study Design

Allocation: Randomized, Control: Dose Comparison, Intervention Model: Crossover Assignment, Masking: Open Label

Conditions

Healthy

Intervention

Continuous positive airway pressure (CPAP) at -5, 0, 5 and 10 cm of water

Location

University of Chicago
Chicago
Illinois
United States
60637

Status

Completed

Source

University of Chicago

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:44:07-0400

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PubMed Articles [21070 Associated PubMed Articles listed on BioPortfolio]

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Medical and Biotech [MESH] Definitions

A technique of respiratory therapy, in either spontaneously breathing or mechanically ventilated patients, in which airway pressure is maintained above atmospheric pressure throughout the respiratory cycle by pressurization of the ventilatory circuit. (On-Line Medical Dictionary [Internet]. Newcastle upon Tyne(UK): The University Dept. of Medical Oncology: The CancerWEB Project; c1997-2003 [cited 2003 Apr 17]. Available from: http://cancerweb.ncl.ac.uk/omd/)

Application of positive pressure to the inspiratory phase when the patient has an artificial airway in place and is connected to a ventilator.

Non-therapeutic positive end-expiratory pressure occurring frequently in patients with severe airway obstruction. It can appear with or without the administration of external positive end-expiratory pressure (POSITIVE-PRESSURE RESPIRATION). It presents an important load on the inspiratory muscles which are operating at a mechanical disadvantage due to hyperinflation. Auto-PEEP may cause profound hypotension that should be treated by intravascular volume expansion, increasing the time for expiration, and/or changing from assist mode to intermittent mandatory ventilation mode. (From Harrison's Principles of Internal Medicine, 12th ed, p1127)

A type of oropharyngeal airway that provides an alternative to endotracheal intubation and standard mask anesthesia in certain patients. It is introduced into the hypopharynx to form a seal around the larynx thus permitting spontaneous or positive pressure ventilation without penetration of the larynx or esophagus. It is used in place of a facemask in routine anesthesia. The advantages over standard mask anesthesia are better airway control, minimal anesthetic gas leakage, a secure airway during patient transport to the recovery area, and minimal postoperative problems.

Application of positive pressure to the inspiratory phase of spontaneous respiration.

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