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→Special Situations
=Calculating A-a gradient=
=Calculating A-a gradient=
Get an ABG. Then use the A-a gradient equation:
Get an ABG. Then use the alveolar gas equation:
*PAO2 - PaO2
*PAO2 - PaO2
** Hypoventilation (increased PaCO2)
** Hypoventilation (increased PaCO2)
** Low SvO2 (low cardiac output, high O2 consumption)
** Low SvO2 (low cardiac output, high O2 consumption)
=Special Situations=
*CCBs can be a 'gas-fire on atelectasis' due to pulmonary vasodilation and disruption of V/Q matching leading to worsened shunt and hypoxemia