Under normal situations,the normal ventilation to perfusion ratio is 4:5 (0.8).Atelectasis can cause a shunt-producing ventilation/perfusion mismatch.This occurs primarily as a result of

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A shunt-producing ventilation/perfusion mismatch is one in which perfusion exceeds ventilation.Whereas situations in which ventilation exceeds perfusion V/Q greater than 0.8 are considered to be dead space producing,situations in which perfusion exceeds ventilation V/Q less than 0.8 are considered to be shunt producing.

Under Normal Situations,the Normal Ventilation to Perfusion Ratio Is 4:5