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Acid—base balance 1
1. In The name of God
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2. Acid-
Acid-Base Balance
Physiology
- The pH of ECF is tightly regulated
- Normal: 7: 35 – 7: 45
- Daily production of acid :12000meq
- Removal lung (most)
- kidney (small ,50-100meq/day)but
restore buffer capacity (HCO3)¯¯¯
- Respiratory or renal disfunctionbreakdown in
processacid-base disorders
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3. -addition of acid [H+ ] &pH
&pH
-PH<7.35= [H+ ]=blood is acidotic or acidemic
PH<7 35= [H
-PH>7.45=[H+]=blood is alkalemic or alkalotic
PH>7 45=[H
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4. Effect of PH imbalance
Majority of body functions optimally at or near pH
of 7.40
AcidosisCNS depression,lethargy,disorientation,
coma
Alkalosisover exitability of CNSperipheral
nerves,tetany, muscular spasms of extremities,face
body,respiratory failure
Significant pH alteration Heart contractility
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5. PaCO2
PaCO2
Normal :35-45mmHg
paco2 is respiratory componet of acid base status
regulation: 1) co2 production rate
2) Alveolar ventilation
fever or exercise co2 productionVAnormal
paco2
Paco2 is the most reliable index of VE(minute volume)
PaCO2 [H+ ]Respiratory Acidosis
Paco2 [H+ ] = Respiratory Alkalosis
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6. Arterial Hco3¯
Hco3
Normal = 22—26 mEq/ L
Metabolic component of Acid –Base status
Regulation by renal system
Hco3¯PH=Metabolic Alkalosis
Hco3¯PH =Metabolic Acidosis
Hco3¯ may change in response to primary change
of paco2 (12—24 hr )
Co2 + H2O H2co3 H+ + Hco3¯
Paco2 Hco3¯
Paco2Hco3¯
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7. Base Excess & Base deficit
BE+ BE¯
BE¯
Normal : 2mEq/L
Be indicate pure metabolic component
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8. Acid—
Acid—Base disorders
1 )Simple disorder: Respiratory Acidosis
Respiratory Alkalosis
Metabolic Acidosis
Metabolic Alkalosis
2 ) Mixed disorders
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9. Respiratory Acidosis
-Alveolar Ventilation relative to co2 production
Paco2 (paco2 > 45 mmhg ) or higher than expected level of
compensation
Ethiology :1) Respiratory :
*Acute upper Airway obstruction
*sever diffuse airway obstruction (Acute or
chronic)
* Massive pulmonary edema
2) Nonrespiratory:
* Drug overdose
*Spinal cord trauma
*Neuromuscular disease
*Head trauma
*trauma to thoracic cage
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10. Compensation of Respiratory
Acidosis
Acute :pH paco2 Hco3¯ BE
Partial compensation : PH paco2 Hco3¯ BE
completely compensated :pH normal up to 7.39
paco2 HCO3¯ BE
Acute Respiratory Acidosis:10—15mmHg
paco21mEq/L Hco3¯
Chronic Respiratory Acidosis:10mmhg
paco24mEq/L Hco3¯
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11. Clinical Effect of Respiratory
Acidosis
Acute:CNS:Headache,sleepy,lethargy,confusion,
semiconciousness,coma(paco2>70 mmhg)
But chronic :higher level of paco2 may be well
tolerated
Hypoxemia may presented
CVS : 1)paco2 vasodilution+COwarm flushed
skin +bounding pulse
2) Arrhytmias
3)Cerebral vasodilation ICP,Retinal
venous distention , pupilledema & headache
Hco3¯(in compensation of Respiratory
Acidosis)Cl level
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12. Respiratory Alkalosis
Paco2 <35mmHg
Alveolar Ventilation Relation to co2 Production
Ethiology :Pain, Hypoxemia(pao2<55-60mmHg),
Acidosis , Anexity, Mechanical ventilation
pH , paco2 and normal Hco3¯ &
BE=uncompensated R Alkalosis
pH7.45 , paco2 , Hco3¯ , BE =partial
compensation R Alkalosis
pH in normal range , paco2 , Hco3¯ , BE=Full
compensated R Alkalosis
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13. Metabolic Acidosis
Hco3¯ BE
Buffers : production or loss
H+Acid) : load H+ or Excretion
Loss of Hco3¯ : diarrhea , renal disease
Metabolic Acid production: Keto acidosis , lactic
acidosis,certain toxins(Metanol)
Post hypocapnia disorder
ANION GAP:Na–(Cl¯+Hco3¯)
Normal=8-16mEq/L . With K =1220mEq/L
Normal Anion gap : HCL , diarrhea , RTA , (type 2 ,
proximal)
High Anion gap :Renal Failure , lactic acidosis , keto
acidosis
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14. Metabolic Alkalosis
-Hco3¯> Normal
-Accumolation of Hco3¯or H loss
Ethiology: Hypokalemia or hypochloremi
*Nasogastric suction
*persistent vomiting
*post hypercapnia Disorder
*Diuretic therapy
*Steroid therapy
*Excessive Adminstration of sodium bicarbonat
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15. Compensation of M Alkalosid
Hypoventilation paco2(Not in awake paients)
Uncompensated M Alkalosis :Hco3¯ BE
PH & Normal paco2
Partial compensated: ph is not yet normal ,
Hco3¯ BE Paco2>45mmHg
Complet compensation : paco2 enough to
PHNormal
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18. Mixed Acid –Base disorder
When two of the symple are Acid –Base are present
simultaneosly
Respiratory & metabolic Acidosis: cardiopulmonary
arrest , COPD , Hypoxia , poisoning & Drug
overdosage (Barbiturate)
Metabolic & Respiratory Alkalosis :Critical care
unit:MV , anxeity , pain , Nasogastric suctioning ,
vomiting , transfusion, antiacid
Metabolic Acidosis & Respiratory Alkalosis:lactic
acidosis(Hypoxia)+MV(Hyper ventilation)
Metabolic Alkalosis & Respiratory
Acidosis:COPD+Diuretic therapy
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19. ﭘﺎراﻣﺘﺮ ھﺎي اﺳﯿﺪ-ﺑﺎز در راﺑﻄﮫ ﺑﺎ ﻏﻠﻈﺖ ﯾﻮن ھﯿﺪروژن
اﺟﺰاي
ﺗﻨﻔﺴﻲ و اﺟﺰاي ﻣﺘﺎﺑﻮﻟﯿﻚ
ﭘﺎراﻣﺘﺮھﺎي اﺳﯿﺪ-ﺑﺎز اﺟﺰا
PH ﻏﻠﻈﺖ ﯾﻮن ھﯿﺪروژن
2Paco اﺟﺰا, ﺗﻨﻔﺴﻲ
2Pao
o2sat
3Hco اﺟﺰا, ﻣﺘﺎﺑﻮﻟﯿﻚ
BE
BEecf
BB
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20. Interpretation and discussion
PH Acidosis PH Alkalosis
PaCo2 Acidosis Paco2 Alkalosis
BE Alkalosis BE Acidosis
Pao2<60mmHg Hypoxia
Sao2<%90 Hypoxia
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