nightflight1945
banned
Topics: 32
Posts: 920
|
d. perfusion of areas poorly ventilated becuz of airway constriction
Esp in cases of small emboli , no other event can justify the cause of such significant hypoxia
|
| nightflight1945
banned
Topics: 32
Posts: 920
|
d. perfusion of areas poorly ventilated becuz of airway constriction
Esp in cases of small emboli , no other event can explain the cause of such significant hypoxia
|
| Eagle_303
Forum Guru
Topics: 77
Posts: 655
|
Take an extreme examploe .On whole pulmonarly artery (right ) is obstructed . Here right lung is being ventilated but not perfused .This is an extreme example of increase in dead space . Is this not so?
Airway constriction does occur reflexly but major pahophysiological change is increase in Physiological dead space:
Harrison says:
Physiology
The most common gas exchange abnormalities are hypoxemia (decreased arterial PO2) and an increased alveolar-arterial O2 tension gradient, which represents the inefficiency of O2 transfer across the lungs. Anatomic dead space increases because breathed gas does not enter gas exchange units of the lung. Physiologic dead space increases because ventilation to gas exchange units exceeds venous blood flow through the pulmonary capillaries.
Edited by Eagle_303 on 09/23/08 - 10:03 AM
|
| DrAlex_76
Forum Guru
Topics: 120
Posts: 410
|
nightflight got the right pick ! thanks
|
| nightflight1945
banned
Topics: 32
Posts: 920
|
Nice Q , Alex!
|
|
| |
| | | | | |
Similar forum topics