The physiological dead space is decreased by:
Upright position
Positive pressure ventilation
Neck flexion
Emphysema
Ans. is 'c' i.e., Neck flexion FactorEffectPosture UprightincreaseSupinedecreasePosition of airway Neck extensionincreaseNeck flexiondecreaseAgeincreaseArtificial airwaydecreasePositive pressure ventilationincreaseAnticholinergic drugsincreasePulmonary perfusion Pulmonary emboliincreaseHypotensionincreaseEmphysemaincrease Factors affecting dead space.
Fundamental Concepts