A patient has a tumor blocking the left mainstem bronchus. What ...

[RODY.ELKHALIL]

A patient has a tumor blocking the left mainstem bronchus. What additional factor would favor the development of atelectasis?
 
  a. Breathing a nitric oxide mix (iNO)
  b. Breathing a helium/oxygen mix (heliox)
  c. Breathing a high percentage of oxygen
  d. Breathing a low percentage of oxygen

Question 2

A pulmonary embolus produces which of the following / abnormalities?
 
  a. True shunting
  b. Shunt effect
  c. Dead space effect
  d. True dead space

[pallen55]

Answer to Question 1

C
Alveolar degassing can occur if the patient has inhaled a high oxygen percentage and the bronchus is then blocked. When all of the oxygen is absorbed from the alveoli, they will develop atelectasis.

Answer to Question 2

D
When an embolus lodges in the pulmonary vascular system, blood flow is reduced or completely absent distal to the obstruction. Consequently the alveolar ventilation beyond the obstruction is wasted, or dead space, ventilation, and no carbon dioxideoxygen exchange occurs. The ventilation-perfusion distal to the pulmonary embolus is high and may even be infinite if there is no perfusion at all.

[RODY.ELKHALIL]

Excellent

[komodo7]

Thanks for the timely response, appreciate it