Integrative physiology
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Integrative Physiology. O2/CO2 transport disorders. Respiratory disorders. Circulation disorders. Acid -Base disorders. Acid -Base disorders. Osmolarity disorders. Electrolyte disorders. Volume disorders. Gastrointestinal disorders. Kidney disorders.

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Integrative Physiology

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Integrative physiology

IntegrativePhysiology

O2/CO2 transport disorders

Respiratorydisorders

Circulationdisorders

Acid-Base disorders

Acid-Base disorders

Osmolarity disorders

Electrolytedisorders

Volume disorders

Gastrointestinaldisorders

Kidneydisorders


Integrative physiology

Homeostasis of internal enviroment

Disorders of the acid-base chemistry, influence of respiration, lungs and altered metabolism


Integrative physiology

Inputs

Balance between input and output flow

Storage

?

Outputs

retention

?

depletion


Integrative physiology

External environment of organism

Balance estimation

Concentrations

extracellular fluid - ECF

intracellular fluid - ICF

Metabolism


Integrative physiology

External environment of organism

Balance estimation

Concentrations

plasma

Lymph

capillaries

extracellular

fluid -ECF

interstitial fluid - ISF

intracellular fluid - ICF

Metabolism


Integrative physiology

External environment of organism

intravascular

blood cells

plasma

Lymph

fluid

(part of ICF)

capillaries

capillaries

extracellular

fluid -ECF

interstitial fluid - ISF

intracellular fluid - ICF

Metabolism


Integrative physiology

External environment of organism

intravascular

blood cells

plasma

Lymph

fluid

(part of ICF)

extracellular fluid -ECF

capillaries

capillaries

transcellular fluid

interstitial fluid - ISF

intracellular fluid - ICF

Metabolism


Integrative physiology

External environment of organism

GIT

Lungs

„exchangers“

Kidney

intravascular

blood cells

plasma

Lymph

fluid

(part of ICF)

extracellular fluid -ECF

capillaries

transcellular fluid

interstitial fluid - ISF

intracellular fluid - ICF

Metabolism


Integrative physiology

External environment of organism

„exchangers“

GIT

Lungs

Kidney

intravascular

blood cells

plasma

Lymph

fluid

(part of ICF)

extracellular fluid -ECF

Circulation

capillaries

„mixing“

transcellular fluid

interstitial fluid - ISF

intracellular fluid - ICF

Metabolism


Integrative physiology

External environment of organism

GIT

Lungs

„exchangers“

Kidney

intravascular

blood cells

plasma

Lymph

fluid

(part of ICF)

extracellular fluid -ECF

Circulation

capillaries

„mixing“

transcellular fluid

interstitial fluid - ISF

intracellular fluid - ICF

Metabolism


Integrative physiology

External environment of organism

CO2

H+

GIT

Lungs

„exchangers“

Kidney

intravascular

blood cells

plasma

Lymph

fluid

(part of ICF)

extracellular fluid -ECF

Circulation

capillaries

„mixing“

transcellular fluid

interstitial fluid - ISF

intracellular fluid - ICF

ACID-BASE

BALANCE

Metabolism


Integrative physiology

Practically complete reabsorbtion of HCO3-

H+ excretion

Acid-Base Balance

60 mmol/24 h

CO2

HCO3-

H2CO3

TA+NH4+

H+

H2O

A-

20 000 mmol/24 hod

60 mmol/24 hod

Metabolic production of CO2

Metabolic production od strong acids


Buffering systems of the blood

Buffering systems of the blood

+

+

CO2

H2O

H2CO3

H+

HCO3-

HBuf

H+

+

Buf-

H+

+

Hb-

HHb

H+

+

Alb-

HAlb

H+

+

HPO42-

H2PO4-

non-bicarbonate buffers

Buf = Hb + Alb + PO4-


Buffering reactions

HCO3-

CO2

H2CO3

H2O

H+

HBuf

Buf-

Buffering reactions


Acid base balance

AcidBalance

BaseBalance

Acid-Base Balance

Productionof HCO3-

Productionof H+

Diet -> 2H++SO42-

Diet ->H+ + HPO4-

Diet -> 3K++ 3 HCO3-

Removalof H+

Removalof HCO3-

2H++2HCO3- -> 2CO2+2H2O

Glucose -> 3H++Citrate-

Excreteorganicanions

Add „new“ HCO3-

2NH4++SO4-

H2PO42-

3K++Citrate-

Urine


H formation removal

H+formation/removal

Reactionsthatyields H+ (more negative charge in productsthan in substrates)

Glucose -> Lactate- + H+

C16fattyacids-> 4ketoacidsanions- + 4 H+

Cysteine -> urea + CO2+H2O+SO42- + 2 H+

Lysine+ -> urea + CO2 + H+

Reactionsthatremoves H+ (more net positive charge in productsthan in substrates)

Lactate- + H+-> Glucose

  • Glutamate- + H+-> urea + CO2+H2O

  • Citrate- + 3 H+-> CO2+H2O

H+ are neitherproduced nor removed(neutrals to neutrals)

  • Glucose -> Glycogenor+ CO2+H2O

  • Triglyceride -> CO2+H2O

  • Alanine -> urea + glucoseorCO2+H2O


Integrative physiology

Diet

ECF

2CO2+2H2O

2 H+

Sulfur-AA

2 HCO3-

SO42-

urine

Glutamine

SO42-

2NH4+

2NH4+

kidney

ECF

Diet

H+

CO2+H2O

HCO3-

RNA-P-

HPO42-

CO2+H2O

urine

kidney

HPO4-

H+


Integrative physiology

liver

Diet

OA utilisation

Glucose

OA-

ECF

HCO3-

OA-

H+

H+

K+

CO2+H2O

CO2+H2O

K+

OA-

OA-

kidney

urine


Integrative physiology

Acid-base regulation

-

CO2

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

  • Buffer systems (msec)

  • Respiration control (12 hours)

  • Kidney control (3-5 days)

HBuf

Buf -

Exchange H+/K+ H+/Na+ between cells and ECF

Role of liver in AB regulation


Integrative physiology

Acid-base disturbances:

-

CO2

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

Buffer system acid-base disturbances

Buf -

Balance acid-base disturbances:

- metabolic acidosis/alkalosis

- respiration acidosis/alkalosis


Integrative physiology

-

CO2

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

  • Buffers system acid-base disturbances:

    • Dilutional acidemia

    • Contractional alkalemia

    • Hypoproteinemic alkalemia

Buf -


Integrative physiology

Dilution

-

CO2

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

  • Buffers system acid-base disturbances:

    • Dilutional acidemia

Buf -


Integrative physiology

Dilution

equilibrium shift

-

CO2

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

  • Buffers system acid-base disturbances:

    • Dilutional acidemia

Buf -


Integrative physiology

Hemoconcentration

-

CO2

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

  • Buffers system acid-base disturbances:

    • Contractional alkalemia

Buf -


Integrative physiology

Hemoconcentration

CO2

-

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

  • Buffers system acid-base disturbances:

    • Contractional alkalemia

Buf -


Integrative physiology

Hemoconcentration

CO2

-

HCO3

equilibrium shift

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

  • Buffers system acid-base disturbances:

    • Contractional alkalemia

Buf -


Integrative physiology

Acute hypoproteinemia

-

CO2

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

Buffers system acid-base disturbances:

Hypoproteinemic alkalemia

Buf -


Integrative physiology

Acute hypoproteinemia

-

CO2

HCO3

TA + NH4+

H2CO3

equilibrium shift

CO2 balance

H2O

H+

H+ balance

HBuf

Buffers system acid-base disturbances:

Hypoproteinemic alkalemia

Buf -


Integrative physiology

Acid-base disturbances:

-

CO2

HCO3

TA + NH4+

H2CO3

CO2 balance

H2O

H+

H+ balance

HBuf

Buffer system acid-base disturbances

Buf -

Balance acid-base disturbances:

- metabolic acidosis/alkalosis

- respiration acidosis/alkalosis


Integrative physiology

PCO2torr

90

pH=7,1

pH=7,2

pH=7,37

pH=7,3

pH=7,43

80

pH=7,5

Sustained respiratory acidosis

Acute respiratory acidosis

70

pH=7,6

60

Sustained metabolic alkalosis

50

Akute metabolic alkalosis

Acute metabolic acidosis

40

30

Sustained metabolic acidosis

Acute

respiratory acidosi

Sustainedrespiratoryalkalosis

20

10

-20

-15

-10

15

-5

-25

25

0

30

10

5

20

Base Excessmmol/l


Integrative physiology

Bicarbonate reabsorbtion

(4) diarhoea

TA+NH4

+

(3) losses of

HCO3-

(1) Increased metabolic production of strong acids

(2) Disorder of H+ excretion

H+excretion

CO2

HCO3-

H2CO3

H+ retention

H+ depletion

H+

H2O

HBuf

A-

Buf -


Integrative physiology

Gastrointestinal losses of bicarbonate

NH3

  • Metabolic acidosis with:

  • increased anion gap

  • normal anion gap

H+

A-

HCO3-

Cl-

H+

Accumulation of anions of strong acids

(laktate acidosis

ketoacidosis

uremic acidosis)

Cl-

NH4+

Cl-

Urea

Overdosis of NH4Cl

K+

Na+

Normal anion

gap

Anion gap

Na+

Increased

anion

gap

Na+

Na+

In urine:

[K+]+[Na+]-[Cl-] < 0

HCO3-

HCO3-

HCO3-

Cl-

Relativeaccumulationofchlorides

Cl-

NH3

Cl-

Cl-

HCO3-

HCO3-

H+

Decreasedacidification

(tubularacidosis, hypoaldosteronisms,

decreasesglomer. filtration)

HCO3-

Cl-

NH4+

K+

Cl-

Na+

in urine:

[K+]+[Na+]-[Cl-] >= 0


Integrative physiology

Diarrhoea


Integrative physiology

Cl-

Na+

H+

H20 + CO2

HCO3-

H2O

H2O

NHE

AE

Colon

H+

Na+

HCO3-

Cl-

H20 + CO2

HCO3-

Na+

Cl-

HCO3-

H2O


Integrative physiology

Cl-

H+

H20 + CO2

HCO3-

HCO3-

Na+

Na+

H2O

H2O

H2O

AE

NHE

Colon

H+

Na+

HCO3-

Cl-

H20 + CO2

HCO3-

Hypotonic fluid loss

Cl-

HCO3-

Na+

H2O

Hypertonicdehydratation

Cl-

Alkalic diarrhoea

HCO3-

Hyperchloremicacidosis


Integrative physiology

Cl-

Cl-

H+

H20 + CO2

HCO3-

HCO3-

Na+

Na+

H2O

H2O

H2O

AE

NHE

Colon

K+

Potassiumloss

H+

Na+

HCO3-

Cl-

H20 + CO2

HCO3-

Hypotonic fluid loss

Cl-

HCO3-

Na+

H2O

Hypertonicdehydratation

Cl-

Severe alkalicdiarrhoea

HCO3-

Hyperchloremicacidosis


Integrative physiology

Cl-

Histidine

H.Histidine+

Cl-

H20 + CO2

H+

HCO3-

Na+

Na+

H2O

H2O

H2O

NHE

Colon

AE

H+

Na+

HCO3-

Cl-

H20 + CO2

HCO3-

Hypotonic fluid loss

Na+

Cl-

HCO3-

H2O

Hypertonicdehydratation

HCO3-

Acidic diarrhoea in DRA, down-regulatedadenoma

Cl-

Hypochloremicalkalosis


Integrative physiology

Cl-

HCO3-

Complete reabsorbtion

norm

H+

norm

Normalacidification

proximaltubularrenalacidosis

NH4+

Cl-

Rateofbicarbonatereabsorbtion

NH4+

Cl-

b

a

c

K+

normal

anion gap

Anion gap

Na+

Na+

Na+

HCO3-

Normalurine

anion

gap

HCO3-

In urine:

[K+]+[Na+]-[Cl-] < 0

Cl-

Plasma levelof HCO3-

20

10

25

15

Cl-

NH3

Cl-

HCO3-

Hyperchloremicacidosiswithnormal anion gap

Cl-

HCO3-

H+

Decreasedacidification

(tubularacidosis, hypoaldosteronisms,

decreasesglomer. filtration)

HCO3-

Cl-

NH4+

K+

Positive urine

anion

gap

Cl-

c

b

a

Na+

norm

In urine:

[K+]+[Na+]-[Cl-] >0

pH=5,5

pH=6,5

pH=7,8

pH=5,5


Integrative physiology

Bicarbonate reabsorbtion

Metabolicalkalosis

TA+NH4

+

hyperaldosteronism

katabolism

(7) K+

depletion

(6) vomiting

H+

K+

Overdosis HCO3-infusion

H+excretion

CO2

HCO3-

H2CO3

Retence H+

Retence H

H+

H2O

HBuf

A-

Buf -


Integrative physiology

PCO2torr

90

pH=7,1

pH=7,2

pH=7,37

pH=7,3

pH=7,43

80

pH=7,5

Sustainedrespiratoryacidosis

Acute respiratory acidosis

70

pH=7,6

60

Sustained metabolic alkalosis

50

Akute metabolic alkalosis

Acute metabolic acidosis

40

30

Sustainedmetabolicacidosis

Acute

respiratory acidosi

Sustained respiratory alkalosis

20

10

-20

-15

-10

15

-5

-25

25

0

30

10

5

20

Base Excessmmol/l


Integrative physiology

Vomiting


Integrative physiology

HCO3-

H+

CO2

Cl-

H2CO3

H2CO3

Balanced

Stomach

CO2

H2O

H2O

Cl-

Cl-

H+ +HCO3-

H+

H2CO3

CO2

CO2

H2O

Duodenum andpancreas


Integrative physiology

Cl-

Hypotonic fluid loss

H+

Hypertonicdehydratation

HCO3-

H+

CO2

Cl-

H2CO3

H2CO3

Unbalanced, HCO3-retension

Stomach

CO2

H2O

H2O

Cl-

hypochloremia

Hypochloremicalkalosis

Cl-

H+

H++HCO3-

CO2

H2CO3

CO2

H2O

Duodenum andpancreas


Integrative physiology

Cl-

Na+

Na+

Cl-

Cl-

Remnant of sodium is exchanged with and H+

K+

Na+

Na+

H+

K+

H+

NH4+

Primary cause: Losses of Cl- a H+ by vomiting

Glomerular filtraton (norm)

Glomerulal filtration (hypochloremic alkalosis)

Na+

Na+

Cl-

Depletion of chlorides

Cl-

H+

Na+/Cl- reabsorbtion is diminished

Readsorbtion of sodium and chlorides

Metabolic alkalosis

H+

H+

K+

K+

Increased exchange Na+ with K+ and Na+ with H+

Intracellular fluid

K+

Potassiumdepletion

H+

Excretion of potassium increases,

acidification of urine regardless of alkalosis

K+

H+

K+

H+

Paradoxal urine acidification

Increases lossse ofn


Integrative physiology

PCO2torr

90

pH=7,1

pH=7,2

pH=7,37

pH=7,3

pH=7,43

80

pH=7,5

Sustained respiratory acidosis

Acute respiratory acidosis

70

pH=7,6

60

Sustained metabolic alkalosis

50

Akute metabolic alkalosis

Acute metabolic acidosis

40

30

Sustained metabolic acidosis

Acute

respiratory acidosi

Sustainedrespiratoryalkalosis

20

10

-20

-15

-10

15

-5

-25

25

0

30

10

5

20

Base Excessmmol/l


Integrative physiology

PCO2torr

90

pH=7,1

pH=7,2

pH=7,37

pH=7,3

pH=7,43

80

pH=7,5

Sustained respiratory acidosis

Acute respiratory acidosis

70

pH=7,6

60

Sustained metabolic alkalosis

50

Akute metabolic alkalosis

Acute metabolic acidosis

40

30

Sustained metabolic acidosis

Acute

respiratory acidosi

Sustainedrespiratoryalkalosis

20

10

-20

-15

-10

15

-5

-25

25

0

30

10

5

20

Base Excessmmol/l


Integrative physiology

Arterial blood at pH=7,4

Concentration of O2

Oxygen released

due drop

PO2

Oxygen released due

to shift

of dissotiacion curve

(Bohr effect)

Venose blood at pH=7,2

PO2

PaO2

PvO2


Integrative physiology

Arterial blood

at pH=7,6

(alkalemia)

Arterial blood at pH=7,4

(normal conditions)

Release of oxygen

at respiratory alkalosis

Concentration of O2

Release of oxygen

at normal condition

Venous blood

at pH=7,36

(alkalemia)

Venous blood at pH=7,2

(normal conditions)

Decrease of

oxygen delivery

to tissues at

acute

respiratory alkalosis

PO2

normal PaO2

PvO2

High PaO2 during hyperventilation at respiratory alkalosis


Integrative physiology

Mixed acid-base disturbances - examples

PCO2torr

90

pH=7,1

pH=7,2

pH=7,37

pH=7,3

pH=7,43

80

pH=7,5

Sustained respiratory acidosis

Acute respiratory acidosis

70

pH=7,6

60

Sustained metabolic alkalosis

50

Akute metabolic alkalosis

Acute metabolic acidosis

40

30

Sustainedmetabolicacidosis

Acute

respiratory acidosi

Sustained respiratory alkalosis

20

10

-20

-15

-10

15

-5

-25

25

0

30

10

5

20

Base Excessmmol/l

Metabolic acidosis

+ respiratory acidosis

Diarrhoea -> metabolic acidosis

+ vomiting -> metabolic alkalosis

+ catabolism, ->lactate metabolic acidosis

Metabolic acidosis

+ respiratory alkalosis


Integrative physiology

Potassium, Acid-Base and volume


Integrative physiology

K+mmol/l

C

D

H+

H+

H+

H+

K+

K+

K+

K+

D:

Rapid alkalinization - H+/K+ - dangeroushypokalemia

K+

K+

C:longlastingacidemia- K+ depletion

8

7

H+

H+

6

K+

Normal kalemiarange

B

K+

5

A

4

3

2

1

A:Norm

pH

7,3

7,2

7,0

7,5

7,1

6,9

7,8

7,4

7,6

7,7

H+

H+

K+

K+

B:Acidemia- exchangeK+/ H+

K+


Integrative physiology

K+

Normal or increased intake of potassium

Potassiumdepletion

From10% to 50%

from5% to 30%


Integrative physiology

Effectofhypokalemia on ECF volume

Intracellularacidosis in proximal tubule

K+

H+

H+

Enhancedresorption HCO3-

Enhancedresorption Cl-

Enhancedresorption Cl-


Integrative physiology

Largedeliveryofsodium in CCD

(e.g. in osmoticdiuresis)

Low chloride in CCS

Potassiumdepletion

Catabolism

Longlastingacidemia

Hypealdosteronism

Diuretics (Furosemid)

K+

K+


Integrative physiology

Potassiumretention

Oliguricphase of acute renal failure

Tubulardamage

(e.g. interstitialnephritis, diabeticnephropathy)

Hypoaldosteronism

(m. Addisoni)

K+

K+


Acid base balance1

ACID-BASE BALANCE

Danish School of acid-base balance

?

"Modern" approach to acid-base balance by Stewart and Fencl


Classical approach of danish school

Classicalapproachof "DanishSchool"

Problem:

How to measurePCO2?


Measurement of acid base parameters

Measurement of Acid-Base parameters

pH, pCO2, [HCO3-]

CO2

HCO3-

H2CO3

H2O

H+

HBuf

Buf-


Measurement of acid base parameters1

Measurement of Acid-Base parameters

pH, pCO2, [HCO3-]

CO2

HCO3-

H2CO3

H2O

H+

HBuf

Buf-


Measurement of acid base parameters2

Measurement of Acid-Base parameters

Alkaline reserve

pH, pCO2, [HCO3-]

CO2

HCO3-

H2CO3

H2O

H+

HBuf

Buf-


Measurement of acid base parameters3

Measurement of Acid-Base parameters

P. Astrup 1956

pH, pCO2, [HCO3-]

CO2

HCO3-

H2CO3

H2O

H+

HBuf

Buf-


Integrative physiology

Equilibration method for pCO2 measurement by Astrup

High level

pCO

in mixture

2

O

/CO

2

2

Titration curve

pCO2

in measered sample

Low level

pCO

In mixture

2

O

/CO

2

2

pH after equilibration

pH

In blood sample

pH after equilibration

with high pCO

(before equilibration

í

with low pCO

2

2

log PCO

2

pH


Integrative physiology

Buffer Base (BB)

BB =[HCO3-]+ [Buf -]

-

CO2

HCO3

depends on cHb

H2CO3

H2O

H+

Normal buffer base:

NBB=41.7+0.42*cHB [g/100ml]

HBuf

Buf -

Base Excess:

BE=BB-NBB


Integrative physiology

-

CO2

HCO3

+ 1 mmol H+ added to 1 litre

of blood

H2CO3

H2O

H+

HBuf

Buf -


Integrative physiology

-

CO2

HCO3

+ 1 mmol H+ added to 1 litre

of blood

H2CO3

H2O

H+

HBuf

1 mmol/l drop of [HCO3-] + [Buf-]

Buf -

BE=-1mmol/l


Integrative physiology

-

CO2

HCO3

+ 1 mmol OH- added to 1 litre

of blood

H2CO3

H2O

H+

HBuf

Buf -


Integrative physiology

-

CO2

HCO3

+ 1 mmol OH- added to 1 litre

of blood

H2CO3

H2O

H+

HBuf

1 mmol/l increase of [HCO3-] + [Buf-]

Buf -

BE= 1mmol/l


Integrative physiology

log pCO2

Plasma and blood with different hematocrit

BE

curve

BE=0

40 torr

BE=-5

BE=5

BE=-10

pH

7.4


Integrative physiology

NBB=41,7 + 0,42 * cHB

Odečet BB

reading of BE


Buffer reactions

+

+

CO2

H2O

H2CO3

H+

HCO3-

HBuf

H+

+

Buf-

H+

+

Hb-

HHb

H+

+

Alb-

HAlb

H+

+

HPO42-

H2PO4-

Bufferreactions


Buffer reactions1

Bufferreactions

+

+

CO2

H2O

H2CO3

H+

HCO3-

HBuf

H+

+

Buf-

H+

+

Hb-

HHb

H+

+

Alb-

HAlb

H+

+

HPO42-

H2PO4-

Nebikarbonátové pufry

Buf = Hb + Alb + PO4-


Buffer reactions2

HCO3-

CO2

H2CO3

H2O

H+

HBuf

Buf-

Bufferreactions


Siggaard andersen

Siggaard-Andersen

BB=[HCO3-] +[Buf-] = const

CO2

HCO3-

Siggaard-Andersen

H2CO3

H2O

H+

HBuf

Buf-


Integrative physiology

BE=0 mEq/l

BE=-15 mEq/l


Siggaard andersen 1960 1962

Siggaard-Andersen (1960-1962)

Definition(forblood in vitro)

- Buffer Base:[BB]=[HCO3-]+[Buf-] (independent on pCO2)

  • NormalBuffer Base:[NBB]

  • [BB] při pH=7.4 při pCO=40 torr atgivenHb

  • (SA nomogram - atnormalalbumins, phophates)

  • Base Excess:[BE]=[BB]-[NBB]

Definitiononlyfor standard conditions

not includedhypo/hyperalbuminemia

hyper/hypophosphatemia

SA nomogram initialy was defined at 38°C


Siggaard andersen 1974 1995

Siggaard-Andersen (1974-1995)

Definition(forblood in vitro)

- Buffer Base:[BB]=[HCO3-]+[Buf-] (independent on pCO2)

  • NormalBuffer Base:[NBB]

  • [BB] při pH=7.4 při pCO=40 torr atgivenHb

  • (SA nomogram - atnormalalbumins, phophates)

  • Base Excess:[BE]=[BB]-[NBB]

Definition NBB dependent on Hb, albumin andphosphates


Problems of danish school

ProblemsofDanishschool

  • Problems: In patientswithacutedisturbancesofnonbikarbonatebuffers :

    e.g. altered plasma concentrations

    (if the original SA nomogram isused)


Stewart theory 1983

Ca+ Mg+

K+

HCO3-

SID

Buf-

Na+

XA-

Cl-

Stewart theory(1983)

[H+] [OH-] = K'w

[Buf-]+[HBuf] = [BufTOT]

[Buf-] [H+] = KBuf[HBuf]

[H+] [HCO3-] = M × pCO2

[H+] [CO32-] = N × [HCO3-]

SID+ [H+]–[HCO3-]–

[Buf-]– [CO32-]– [OH-] = 0

Peter Stewart


Stewart theory solution of equations

pH = f (pCO2, SID, BufTOT)

Stewart theory – solutionofequations

[H+]4 + (SID+ KBUF) [H+]3+

+(KBUF (SID - [BufTOT])-K'w-M×pCO2)[H+]2

- (KBUF(K'w2 + M × pCO2)-N×M×pCO2)[H+]

- K'w×N×M×pCO2= 0


Mathematical wizardry

pH = f (pCO2, SID, BufTOT)

Mathematicalwizardry

dependencyofvariables = causality

Vladimír Fencl


Integrative physiology

Stewart‘s „modernapproach

Lungs

Ventilation

Perfusion

KREV

Dependentvariables

[HCO3-]

[Buf-]

[CO32-]

[OH-]

[H+] (pH)

Independent variables

PCO2

SID

[BufTOT]

CO2

Tissues

Perfusion

Metabolism

Transport

CO2

STRONG IONS

KIDNEYS

Filtration

Resorption

Secretion

LIVER

Synthesis

Degradation

GIT

Absorbtion

Secretion

PROTEINS

STRONG IONS

STRONG IONS


Balance theory

BALANCE THEORY

Excretion of CO2 in the lungs

The excretion of strong acids in the kidney

CO2production

Metabolic productionofstrongacids


Integrative physiology

Blood Volume

Extracellular fluid volume

ArterialPressure


Integrative physiology

return


Integrative physiology

Starlingcurveandvenousreturncurve


Integrative physiology

Strenousexcercise

Rest


Integrative physiology

Decompensatedcardiacfailure


Integrative physiology

Treatment od decompensatedcardiacfailure


Integrative physiology

High-outputcardiacfailure

return


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