MODERN MEDICINE's ACID –BASE FUNDA’S---by Dr.K.B.RAVVA
-----Acidosis-----------------à
(Lt.side) CO2 + H2O--------à H2CO3--------à H+ + HCO3- (Rt.side)
<----Alkalosis------------------
EXPECT FOR THE COMPENSATION, THE
BASIC RULE = ACIDOSIS= DECREASED PH / INCREASE [H+] / LOSS OF HCO3-
= ALKALOSIS= INCREASED PH / DECREASED [H+] / Decreased PCO2
Lung Compensate for==
(1) For Metabolic Acidosis by Decreasing PCO2 (by Hyperventilation)
(2) For Metabolic Alkalosis by Increasing PCO2 (by Hypoventilation)
Kidney Compensate for==
(1) For Respiratory Acidosis by Increasing HCO3- Reabsorption.
(2) For Respiratory Alkalosis by Decreasing HCO3- Reabsorption.
Always look for [HCO3-] / [PCO2]==
(1) Uncompensated / simple conditions==( any one of these can be the fes. But only one of these…)
= Normal/ Increase
= Normal/ Decrease
= Increase/ Normal
= Decrease/ Normal
(1) Compensated conditions==
= Increase/ Increase
= Decrease/ Decrease
(2) Mixed i.e. (Both Respiratory and metabolic Acidosis or Alkalosis)==
i.e. Metabolic Acidosis and Respiratory Acidosis=[HCO3-]/ PCO2== Decrease/ Increase
Metabolic Alkalosis and Respiratory Alkalosis=[HCO3-]/ PCO2== Increase/ Decrease
Things to look for (in order)=
(1) PH (N=7.38-7.44)
(2) PCO2 (N=35—45)
(3) [HCO3-] (N=21—30)
(4) [HCO3-]/ PCO2
Respiratory Acidosis=simple/uncompensated
(1) PH (N=7.38-7.44) == Decrease
(2) PCO2 (N=35—45)== Increase
(3) [HCO3-] (N=21—30)== Normal
(4) [HCO3-]/ PCO2== Normal/ Increase
Respiratory Acidosis= compensated
(1) PH (N=7.38-7.44)== Normal
(2) PCO2 (N=35—45)== Increase
(3) [HCO3-] (N=21—30)== Increase
(4) [HCO3-]/ PCO2== Increase/ Increase
Respiratory Alkalosis=simple/uncompensated
(1) PH (N=7.38-7.44)== Increase
(2) PCO2 (N=35—45)== Decrease
(3) [HCO3-] (N=21—30)== Normal
(4) [HCO3-]/ PCO2== Normal/ Decrease
Respiratory Alkalosis= compensated
(1) PH (N=7.38-7.44)== Normal
(2) PCO2 (N=35—45)== Decrease
(3) [HCO3-] (N=21—30)== Decrease
(4) [HCO3-]/ PCO2== Decrease/ Decrease
Metabolic Acidosis=simple/uncompensated
(1) PH (N=7.38-7.44)== Decrease
(2) PCO2 (N=35—45)== Normal
(3) [HCO3-] (N=21—30)== Decrease
(4) [HCO3-]/ PCO2== Decrease/ Normal
Metabolic Acidosis= compensated
(1) PH (N=7.38-7.44)== Normal
(2) PCO2 (N=35—45)== Decrease
(3) [HCO3-] (N=21—30)== Decrease
(4) [HCO3-]/ PCO2== Decrease/ Decrease
Metabolic Alkalosis=simple/uncompensated
(1) PH (N=7.38-7.44)== Increase
(2) PCO2 (N=35—45)== Normal
(3) [HCO3-] (N=21—30)== Increase
(4) [HCO3-]/ PCO2== Increase/ Normal
Metabolic Alkalosis=Compensated
(1) PH (N=7.38-7.44)== Normal
(2) PCO2 (N=35—45)== Increase
(3) [HCO3-] (N=21—30)== Increase
(4) [HCO3-]/ PCO2== Increase/ Increase