an alteration in lung parenchymaleadingto ventilation - perfusion mismatch
the procedure itselfpotentially leadingto ventilation perfusion mismatch
an overperfusionresultingin a ventilation - perfusion mismatch
gas exchangeleadingto ventilation / perfusion mismatch
Insufficient inflation of the lungs , which can result from inadequate mechanical ventilation or an associated injury such as flail chestcan also contributeto the ventilation / perfusion mismatch