12/23/2023 0 Comments Changes in anatomical dead space lungs![]() ![]() A V/Q of infinity is the definition of alveolar dead space. Since the perfusion of the lung unit reduces to zero, the V/Q ratio for this unit is infinity (V÷0 = ∞). Consider a scenario where a small embolus blocks all perfusion to a lung unit. Alveolar dead space: Normally, ventilation and perfusion of respiratory zones (lung units) are nicely matched (normal V/Q ~0.9).The dead space in an average adult has been reported to be ~150 cc or 2cc/kg ideal body weight. Anatomical dead space is thus defined as the volume of the conducting zone (Figure 1). The remaining circuit: respiratory bronchioles to alveolar sacs (generation 23) participate in gas exchange and is called the respiratory zone. ![]()
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