Algorithms in Medicine @MatthewHoMD
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Matthew Ho, MD PhD https://twitter.com/MatthewHoMD
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Pulmonary Function Testing (PFT) Interpretation Algorithm

Restrictive Lung Disease:
 • Chest wall or neuromuscular disorders
 • Interstitial
Pulmonary Function ... Algorithm Restrictive ... Lung Disease Obstructive ... #Function #Testing ... #Algorithm #diagnosis
Approach to Thrombotic Microangiopathy (TMA) - Differential Diagnosis and Management Algorithm

Suspected TMA: Unexplained thrombocytopenia + MAHA
Microangiopathy (TMA) - Differential ... and Management Algorithm ... hemosiderin, Hepatic function ... Microangiopathy #TMA #Differential ... Diagnosis #Management #Algorithm
Approach to Elevated aPTT / PT - Differential Diagnosis Algorithm

aPTT: Intrinsic / Final
PT: Extrinsic / Final

By
Elevated aPTT / PT ... - Differential ... Diagnosis Algorithm ... #INR #Algorithm ... #Hematology #differential
Hypoxemia Differential Diagnosis Algorithm by A-a Gradient

Normal A-a Gradient:
 • ↓ Atmospheric pressure
 • Hypoventilation: CNS
Hypoxemia Differential ... Diagnosis Algorithm ... Hypoxemia #Hypoxia #Differential ... #Diagnosis #Algorithm ... #pulmonary #Aa
Hypokalemia - Differential Diagnosis Algorithm

Transcellular Shift:
 • Alkalosis
 • ↑ beta-2 adrenergic simulation 
 • Erythropoiesis
Hypokalemia - Differential ... Diagnosis Algorithm ... GI losses (NG suction ... #Hypokalemia #Differential ... #Diagnosis #Algorithm
Pancytopenia - Differential Diagnosis Algorithm
 • 12-13 g/dL,
 • ANC < 1800/uL,
 • platelet < 150,000/uL

Initial
Pancytopenia - Differential ... Diagnosis Algorithm ... iron studies, PT ... /aPTT Differential ... #Diagnosis #Algorithm
Chest Pain - Diagnosis and Workup Algorithm

History and Exam
Acute life-threatening causes:
 • Acute myocardial infarction
 •
Diagnosis and Workup Algorithm ... Pneumothorax • Pulmonary ... , LET, lipase, PT ... Pain #Diagnosis #Algorithm
Erythrocytosis - Polycythemia Differential Diagnosis Algorithm

Elevated Hemoglobin:
 • Males: Hb > 16.5 g/dL/HCT ≥ 49%
 •
- Polycythemia Differential ... Diagnosis Algorithm ... Hypoxia-driven: Cardiac/pulmonary ... Polycythemia #Vera #PV #Differential ... #Diagnosis #Algorithm
Hypoxemia / Hypoxia - Rapid Response Management Algorithm

Stridor - Upper airway pathology:
 • Anaphylaxis
 • Foreign
Response Management Algorithm ... pneumonia • Water: pulmonary ... Hypoxemia #Hypoxia #differential ... Diagnosis #Management #Algorithm ... #rapid #pulmonary
Iron Deficiency Anemia - Differential Diagnosis Algorithm

Labs: Ferritin, iron, transferrin, TIBC, TSAT, sTfR

 • Blood loss:
Deficiency Anemia - Differential ... Diagnosis Algorithm ... athletic training, Pulmonary ... Deficiency #Anemia #Differential ... #Diagnosis #Algorithm