What is the purpose of Müller's maneuver in a clinical setting?

Müller's maneuver is a clinical test specifically designed to help identify upper airway obstruction. During this maneuver, the patient performs a forced inspiratory effort against a closed airway, typically by closing the mouth and pinching the nose while attempting to inhale. This action creates negative pressure in the thoracic cavity and can help to reveal areas of airway collapse or obstruction that may not be evident during normal breathing.

Identifying upper airway obstruction is crucial in various clinical scenarios, particularly in conditions such as sleep apnea or when assessing patients with suspected anatomic abnormalities of the airway. By observing how the airway responds during the maneuver, clinicians can pinpoint specific locations of dysfunction, which can guide further diagnostic and therapeutic interventions.

Measuring airway resistance, assessing lung capacity, and evaluating diaphragm function involve different techniques and assessments and are not the primary intention of Müller's maneuver. Each of those other options utilizes different modalities such as spirometry, imaging studies, or specific tests for diaphragm activity, which are not addressed by this maneuver. Thus, the correct purpose of Müller's maneuver in a clinical setting revolves around its ability to reveal potential upper airway obstructions.