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Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
loss, lethargy, fever ... • Fever, weight ... be normal • Fever ... lymphadenopathy, • Abdominal ... Infections #HIV #AIDS #pulmonary
Fever in Returning Travelers from Tropical Regions - Frequent Differential Diagnoses
Medical History:
 • Skin exposure to
Fever in Returning ... Cough, dyspnea - Pneumonia ... melioidosis, typhoid, pulmonary ... eosinophilia - Tropical pulmonary ... infection • Abdominal
Venn Diagram - Does this patient have pneumonia?
Diagnosis is generally based on three lines of evidence:
this patient have pneumonia ... e.g., CXR, CT, ultrasound ... Inflammation (e.g., fever ... procalcitonin) - Pulmonary ... #Pneumonia #Venn
Non-Resolving Pneumonias: Etiologies
Unusual Infections:
 - Immunocompromised patients (e.g.: Mycobacterium, Aspergillosis, Nocardia)
 - Endemic Fungi (e.g.: Histoplasmosis,
Non-Resolving Pneumonias ... yersinia/rats, Q fever ... Others: - Pulmonary ... #NonResolving #Pneumonia ... #diagnosis #pulmonary
Causes of Acute Onset Fever - Differential Diagnosis Algorithm
Viral:
 • Rhinovirus
 • Influenza Virus
 • Parainfluenza
of Acute Onset Fever ... Infection • Pneumonia ... • Thoracic • Abdominal ... disease • Drug fever ... #Fever #Acute
Cryptogenic Organizing Pneumonia (COP)

Cryptogenic Organizing Pneumonia Overview:
 • Idiopathic form of organizing pneumonia
 • formerly BOOP
Cryptogenic Organizing Pneumonia ... of organizing pneumonia ... cough, dyspnea, fever ... , Pulmonary lymphoma ... #COP #BOOP #pulmonary
Eosinophilic Pneumonia
When to suspect Eosinophilic Pneumonia? Non-resolving pneumonia + BAL > 25% eosinophils + excluded more
Eosinophilic Pneumonia ... Non-resolving pneumonia ... tobacco hx - Fever ... Consolidations AKA "inverse pulmonary ... #diagnosis #pulmonary
Approach to Eosinophilic Lung Diseases
 • Acute Eosinophilic Pneumonia (< 1 wk) - ~30yo, M; Recent
Acute Eosinophilic Pneumonia ... initiation of smoking; Fever ... brown sputum, fever ... Travel hx, food hx; Fever ... Lung #Diseases #pulmonary
Secondary Bacterial Peritonitis (SBP) on Abdominal POCUS

Cirrhosis with fever/abd pain-?SBP. POCUS for win.  Secondary bacterial
Peritonitis (SBP) on Abdominal ... Cirrhosis with fever ... Peritonitis #SBP #Abdominal ... POCUS #clinical #ultrasound
Diagnostic criteria for Neutropenic Enterocolitis (NEC)
Major Criteria:
 • Neutropenia (ANC <500 x 10^9 cells/L)
 • Bowel
30mm length) • Fever ... Criteria: • Abdominal ... analog scale) • Abdominal ... distention • Abdominal ... Diagnosis #criteria #hematology