<prompt> Increased alveolar O2 concentration is due to which of the following condition?Intra cardiac right to left shuntAsthmaPulmonary hemorrhageVentilation perfusion mismatch  <response>: A high VQ ratio increases paO2 and decreases paCO2. This finding is typically associated with pulmonary embolism where blood circulation is impaired by an embolus. A high VQ can also be observed in COPD as a maladaptive ventilatory overwork of the undamaged lung parenchyma. In Asthma and Pulmonary hemorrhage there is decreased O2 concentration. 