The physiological dead space is decreased by
Correct Answer: Neck flexion
Description: Dead space is defined as the volume of the airway that doesnot paicipate in gas exchange (It is nothing but ventilation occurs but perfusion doesnot occur) Anatomical Dead Space : from nasopharynx to respiratory bronchioles.average adult,normally 150ml Alveolar dead space : Alveoli that are ventilated but not perfused.usually it is absent Physiological or total dead space : Anatomical + Alveolar dead space Factors that increase dead space : upright position neck extension advanced age positive pressure ventilation decreased pulmonary perfusion (pulmonary emboli or pulmonary hypeension) lung diseases (emphysema or cystic fibrosis ) FACTORS THAT DECREASE DEAD SPACE : supine position , neck flexion , intubation Anatomical dead space is measured by single breath nitrogen test , physiological dead space is measured by modified bohr's equation.
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Anaesthesia
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