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Acid Base Disorders - Formulas for appropriate metabolic and respiratory compensation

- Dr Amith Sreedharan - Consultant
Base Disorders - Formulas ... metabolic and respiratory ... Care Medicine #Respiratory ... #Compensation #Formula ... Diagnosis #Nephrology #AcidBase
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
Acid-Base Disorders - Differential ... Diagnosis Algorithm ... HCO3 12:10 • Respiratory ... < 35 mmHg) #AcidBase ... #Diagnosis #Algorithm
Acid Base and Blood Gas Analysis
1. pH - What’s the primary disturbance?
2. pCO2 - What’s the
Respiratory Acidosis ... CO2 production Respiratory ... MD @nickmmark #acidbase ... #workup #algorithm ... alkalosis #metabolic #respiratory
Approach to Acid Base Disorders - Evaluation and Differential Diagnosis
1) Start with the Anion Gap (AG).
2)
Evaluation and Differential ... done by using formulas ... retention • Respiratory ... Ventilation • Respiratory ... Disorders #Evaluation #workup
Acid-Base Disorders - Expected Compensation Equations

Metabolic Acidosis:
 • pCO2 = 1.5 x HCO3 + 8 ±
± 2 (Winter’s formula ... pCO2 ↑ 0.7 Respiratory ... ∆ HCO3 ↑ 3 Respiratory ... #Acid #Base #AcidBase ... Compensation #Metabolic #Respiratory
Hypophosphatemia - Differential Diagnosis Algorithm
Appropriately Low Kidney Phosphate Excretion:
 • Decreased GI Absorption: Chronic Diarrhea, Antacids,
Hypophosphatemia - Differential ... Diagnosis Algorithm ... Syndrome, Acute Respiratory ... #Diagnosis #Algorithm ... nephrology #phosphorus #workup
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 ... Index CARDIAC WORK ... RCWI Cardiac Work ... min 400-600 mL Respiratory ... ratio Respiratory
Approach to the Sick Neonate (<1 month age)
1) Bring to Warmer, Call for Help
2) Apply Monitors
Management 7) Do Work ... Up Differential ... - Sepsis F - Formula ... pediatrics #neonatal #differential