Respiratory confusion pairs
22 Respiratory topics students commonly mix up on Step 1, each with the fastest separator, a side-by-side comparison, and a free practice question.
- Asthma vs COPDAsthma: obstruction reverses at least 12 percent and 200 mL after a bronchodilator; COPD: largely fixed obstruction.Video
- Pneumonia vs Pulmonary embolismPneumonia is infectious alveolar filling; PE is sudden vascular obstruction with risk factors.Video
- Transudative effusion vs Exudative effusionTransudate is systemic pressure/oncotic fluid; exudate meets Light's criteria from local pleural disease.Video
- Centriacinar emphysema vs Panacinar emphysemaCentriacinar is smoker upper-lobe bronchiole-centered disease; panacinar is alpha-1 antitrypsin lower-lobe whole-acinus disease.Video
- Chronic bronchitis vs EmphysemaChronic bronchitis is mucus-defined airway disease; emphysema is alveolar destruction with low DLCO and hyperinflation.Video
- Non-cystic fibrosis bronchiectasis vs Cystic fibrosisBronchiectasis is the airway damage pattern; cystic fibrosis is a multisystem CFTR cause of bronchiectasis.Video
- Idiopathic pulmonary fibrosis vs Hypersensitivity pneumonitisIPF is idiopathic basilar subpleural honeycombing; hypersensitivity pneumonitis is exposure-linked immune ILD with bronchiolocentric…Video
- Sarcoidosis vs Berylliosis / histoplasmosisSarcoidosis is a diagnosis of compatible multisystem granulomas after excluding beryllium exposure and fungal infection.Video
- Coal worker / silicosis pneumoconiosis vs Asbestosis / berylliosisCoal/silica is upper-lobe nodular dust disease; asbestos is lower-lobe pleural-plaque fibrosis; beryllium is sarcoid-like occupational…
- Asbestosis vs Malignant mesotheliomaAsbestosis: interstitial fibrosis with calcified pleural plaques and ferruginous bodies; mesothelioma: pleural malignancy with hemorrhagic…Video
- Neonatal respiratory distress syndrome vs Acute respiratory distress syndromeNeonatal RDS is prematurity surfactant deficiency; ARDS is acute diffuse alveolar damage after a lung/systemic insult.Video
- Pulmonary arterial hypertension vs Secondary pulmonary hypertension groupsGroup 1 is pulmonary arterial vascular disease; Groups 2-5 are classified by the upstream cause.Video
- Simple / open pneumothorax vs Tension pneumothoraxTension is pneumothorax plus obstructive shock physiology; open is defined by chest wall communication.Video
- Lobar / bronchopneumonia vs Atypical pneumoniaLobar is one confluent lobe; bronchopneumonia is patchy airway-centered; atypical is interstitial/walking with systemic symptoms.Video
- Mycoplasma / Chlamydia pneumoniae vs Legionella / viral pneumoniaCold agglutinins and young crowding point Mycoplasma; water exposure plus GI-neuro-hyponatremia points Legionella; viral prodrome points…Video
- Squamous cell carcinoma of lung vs Adenocarcinoma of lungSquamous is central cavitary PTHrP; adenocarcinoma is peripheral gland-forming/mucin-producing.Video
- Small cell lung cancer vs Non-small cell lung cancerSmall cell is central neuroendocrine and systemic early; non-small cell is subtype-driven and often staged for local versus systemic…Video
- Pancoast syndrome vs Superior vena cava syndromePancoast: apical tumor with arm pain and Horner syndrome; SVC syndrome: facial plethora, JVD, and upper-body edema from venous obstruction.Video
- Obstructive sleep apnea vs Central sleep apneaObstructive sleep apnea: apneas with continued respiratory effort; central sleep apnea: apneas with absent respiratory effort.Video
- High-altitude pulmonary edema vs High-altitude cerebral edemaHAPE is lungs: dyspnea, cough, crackles, hypoxemia; HACE is brain: ataxia and altered mental status.
- Acute bronchitis vs Chronic bronchitisAcute bronchitis is short-term postinfectious cough; chronic bronchitis is a strict productive-cough duration diagnosis.Video
- Upper-lobe pneumoconiosis vs Lower-lobe pneumoconiosisUpper-lobe pneumoconioses: silicosis, coal workers, berylliosis; lower-lobe pneumoconiosis: asbestosis with calcified pleural plaques.Video
Respiratory rapid reviews
Several confusion pairs per video, with chapters for each pair.
Medicine Explained
Plain-language explainers on the physiology behind respiratory.
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