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Acid Base Disorders - Formulas for appropriate metabolic and respiratory compensation

- Dr Amith Sreedharan - Consultant
Base Disorders - Formulas ... metabolic and respiratory ... compensation ... #Formula #Winters ... Diagnosis #Nephrology #AcidBase
Summary of metabolic compensation for respiratory acid-base disorders
#Diagnosis #Nephro #Respiratory #Acidosis #Alkalosis #Metabolic #Compensation #Formulas #Curbsiders
Summary of metabolic compensation ... for respiratory ... Diagnosis #Nephro #Respiratory ... Alkalosis #Metabolic #Compensation ... #Formulas #Curbsiders
Prediction of Compensatory Responses on Simple Acid-Base Disturbances

#acidbase #compensation #metabolic #respiratory #diagnosis #calculations #formulas #acidosis #alkalosis
Disturbances #acidbase ... #compensation # ... metabolic #respiratory ... #calculations #formulas
Acid-Base Disorders - Differential Diagnosis Algorithm
Acidemia (pH < 7.35)
 • Metabolic Acidosis (HCO3 < 24mmol/L) CO2
Differential Diagnosis Algorithm ... HCO3 12:10 • Respiratory ... HCO3 7:10 • Respiratory ... < 35 mmHg) #AcidBase ... #Causes #Compensation
Acid-Base Disorders - Expected Compensation Equations

Metabolic Acidosis:
 • pCO2 = 1.5 x HCO3 + 8 ±
Disorders - Expected Compensation ... ± 2 (Winter’s formula ... pCO2 ↑ 0.7 Respiratory ... #Acid #Base #AcidBase ... #Disorders #Compensation
Approach to Acid Base Disorders - Evaluation and Differential Diagnosis
1) Start with the Anion Gap (AG).
2)
the appropriate compensation ... done by using formulas ... retention • Respiratory ... Ventilation • Respiratory
Perform computations online at:
ScyMed.com
6th ED
ICU-card
«ICU, Formulas & Drugs»
HEMODYNAMIC PATTERNS
Condition
SAP
CVP

PAP PCWP

CO C(a-v)02 PVR

SVR
Hypovolemic shock
↓
↓
↓
↓
↓
↑
↑
↑
Cardiogenic shock
↓
1
↑
1

1
↑

Septic shock
↓
↓
↓
↓
↑
↓
↓
↓
Cardiac Tamponade
.
↑
↑
1
↓

→
↑
RV
ICU-card «ICU, Formulas ... Q-T interval correction ... min 400-600 mL Respiratory ... = >60% Forced Espiratory ... ratio Respiratory