RT Book, Section
A1 Levitzky, Michael G.
A2 Levitzky, Michael
A2 McDonough, Kathleen
A2 Kaye, Alan David
A2 Hall, Stanley
SR Print(0)
ID 1175535066
T1 Ventilation-Perfusion Relationships
T2 Clinical Physiology in Anesthetic Practice
YR 2021
FD 2021
PB McGraw Hill
PP New York, NY
SN 9781259641954
LK accessanesthesiology.mhmedical.com/content.aspx?aid=1175535066
RD 2024/04/24
AB Alveolar  ventilation  brings  inspired  gas  with  a  PO2  of  about  150  mm  Hg  and  a  PCO2  of  about  0.3  mm  Hg  into  the  alveoli.  At  the  same  time,  the  right  ventricle  pumps  mixed  venous  blood  with  a  PO2  of  about  40  mm  Hg  and  a  PCO2  of  about  45  mm  Hg  into  the  pulmonary  capillaries.  Oxygen  diffuses  from  the  alveoli  into  the  pulmonary  capillaries  at  the  same  time  that  carbon  dioxide  diffuses  from  the  pulmonary  capillaries.  The  PO2  and  PCO2  of  an  alveolar-capillary  unit  are  determined  by  the  relative  ventilation  and  perfusion  of  the  unit.  Increasing  the  ventilation  relative  to  the  perfusion  increases  the  PO2  and  decreases  the  PCO2  of  the  alveolus.  Increasing  the  perfusion  relative  to  the  ventilation  decreases  the  PO2  and  increases  the  PCO2  of  that  alveolus.