1200 results
V/Q Mismatch Physiology

by Dr. Lizzy Hastie @LizzyHastie

#VQMismatch #pathophysiology #diagnosis #pulmonary
V/Q Mismatch Physiology ... LizzyHastie #VQMismatch ... pathophysiology #diagnosis #pulmonary
Hypoxemia Differential Diagnosis Algorithm by A-a Gradient

Normal A-a Gradient:
 • ↓ Atmospheric pressure
 • Hypoventilation: CNS
Algorithm by A-a Gradient ... Normal A-a Gradient ... Alveolar • V/Q Mismatch ... Diagnosis #Algorithm #pulmonary ... #Aa #Gradient
Approach to the A-a Gradient
A-a gradient = PAO2 - PaO2
A-a gradient = [FiO2 x (Patm -
Intracardiac, Pulmonary ... and more • V/Q Mismatch ... : Pulmonary Edema ... , Atelectasis, Pulmonary ... Diffusion Defect: Pulmonary
Pulmonary stenosis - severity - Grading of pulmonary stenosis

#Diagnosis #Cardiology #Pulmonic #Pulmonary #Stenosis #Severity #Grading #Classification
Pulmonary stenosis ... - severity - Grading ... of pulmonary stenosis ... Cardiology #Pulmonic #Pulmonary ... Stenosis #Severity #Grading
Hypoxemic Respiratory Failure - Differential Diagnosis Framework
DECREASED INSPIRED OXYGEN
 • Low PATM Can decrease first part
common than VIQ mismatch ... lung diseases, pulmonary ... PERFUSION (V/Q) MISMATCH ... gravity-dependent gradients ... asthma, COPD, pulmonary
Severity of Aortic Stenosis in Adults 
Current ACC/AHA guidelines recommend cut-off values for Doppler-echocardiographic measurements of
0.6 cm2/m2, mean gradient ... transvalvular gradient ... , inconsistent grading ... <1 cm2 with a gradient
Hepatopulmonary Syndrome (HPS) 

HPS-differential diagnosis:
1. Pulmonary vasculature
2. Diseases of the lung parenchyma
3. Pleura and diaphragm

HPS-diagnosis:
1. Patients
Pulmonary vasculature ... Alveolar-arterial oxygen gradient ... HPS #hepatology #pulmonary
Diastolic Function Grading - Schematic diastolic filling patterns

I: impaired relaxation, II: moderate diastolic dysfunction (pseudonormal), III:
Diastolic Function Grading ... velocities, PVF: pulmonary ... atrium, PASP: pulmonary ... #Dysfunction #Grading
Causes of Hypoxemia- Differential Diagnosis Algorithm
Ventilation/perfusion Mismatch
 • Airway Disease (Asthma, COPD)
 • Vascular (PE*)
 •
Ventilation/perfusion Mismatch ... lung disease • Pulmonary ... Septal Defect Pulmonary ... Algorithm #Causes #Pulmonary
Aortic Stenosis Grading on echocardiography
The cut-offs for grading can be found in table 1. Discrepancies are
Aortic Stenosis Grading ... The cut-offs for grading ... 4.0 m/s and mean gradient