PaO2 acidbase syndrome causes - GrepMed

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Acid Base Disorders - Blood Gas Interpretation

Steps for Blood Gas Interpretation:
1. Acidemia or Alkalemia?
2.

7.35-7.45 • PaCO2 ... 35-45 mmHg • PaO2 ... Metabolic: pH pCO2 ... D-lactate (short bowel syndrome ... MDaniyalHashmi1 #AcidBase

Hypoxia and Hypoxemia - Overview
Hypoxia - insufficient oxygen delivered to tissues to meet demands
Hypoxemia - low

O2 is inspired) PAO2 ... hypoxia) - Low PaO2 ... Low SvO2 → Low PaO2 ... Low SvO2 → Low PaO2 ... differential #diagnosis #causes

Approach to the A-a Gradient
A-a gradient = PAO2 - PaO2
A-a gradient = [FiO2 x (Patm -

A-a gradient = PAO2 ... - PaO2 A-a gradient ... /0.8)] - PaO2 Simplified ... Hypoventilation Syndrome ... Hepatopulmonary Syndrome

Acid-Base Disorders - Differential Diagnosis Algorithm
Acidemia (pH < 7.35)
• Metabolic Acidosis (HCO3 < 24mmol/L) CO2

Respiratory Acidosis (pCO2 ... Respiratory Alkalosis (pCO2 ... < 35 mmHg) #AcidBase ... Diagnosis #Algorithm #Causes

Arterial Blood Gas (ABG) Analysis - Metabolic + Respiratory Acidosis + Alkalosis

pH ↓ pCO2 ↓ -

Alkalosis pH ↓ pCO2 ... acidosis pH ↑ pCO2 ... alkalosis pH ↑ pCO2 ... alkalosis pH ↓ pCO2 ... Interpretation #AcidBase

PLACO Mnemonic - Approach to Acid-Base Disorders
P - Determine the pH
L - Labs: PCO2 & HCO3
A

pH L - Labs: PCO2 ... jadav_md #PLACO #AcidBase

Acid Base Compensation - Directions - If all three variables (pH, HCO2, pCO2) move in the

variables (pH, HCO2, pCO2 ... Diagnosis #Nephro #AcidBase

Hepatopulmonary Syndrome
HPS - Diagnosis:
1. Patients with liver disease
2. Alveolar-arterial oxygen gradient (AaP02) >15 mmHg

Hepatopulmonary Syndrome ... Moderate HPS: ≥ 60 PaO2 ... Severe HPS: ≥ 50 PaO2 ... Very severe HPS: PaO2 ... Hepatopulmonary #Syndrome

Platypnea-Orthodeoxia Syndrome on Physical Exam
The case of a patient with a diagnosis of cirrhosis and platypnea-orthodeoxia

Platypnea-Orthodeoxia Syndrome ... Physical Exam The case ... platypnea-orthodeoxia syndrome ... to 90% (and in paO2 ... #Orthodeoxia #Syndrome

Acid Base and Blood Gas Analysis
1. pH - What’s the primary disturbance?
2. pCO2 - What’s the

2. pCO2 - What’s ... the pCO2? ... MD @nickmmark #acidbase

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