What is "Wet Lung Syndrome" (Pulmonary Edema)?
"Wet lung syndrome" is a colloquial term for pulmonary edema—the abnormal accumulation of fluid in the lungs' interstitial spaces and alveoli—which occurs when fluid filtration exceeds lymphatic drainage capacity. 1
Pathophysiology and Classification
Pulmonary edema develops through four distinct physiologic mechanisms 2, 3:
- Hydrostatic (Cardiogenic) Edema: Elevated pulmonary capillary pressure from left-sided heart failure causes fluid transudation into lung tissue 1
- Permeability Edema with Diffuse Alveolar Damage (DAD): Exemplified by ARDS, where both endothelial and epithelial barriers are extensively damaged, causing air-space consolidation and severe hypoxia 3
- Permeability Edema without Alveolar Damage: Increased endothelial permeability alone (e.g., from certain medications or inflammatory states) causes predominantly interstitial edema with milder symptoms and rapid resolution 3
- Mixed Edema: Combined increase in hydrostatic pressure and membrane permeability 2
The critical distinction lies in barrier integrity: when the alveolar epithelium remains intact, edema manifests primarily as interstitial (not air-space) disease, predicting milder clinical course and prompt resolution 3. Conversely, ARDS with extensive alveolar damage causes prolonged, severe disease 3.
Clinical Relevance to Your Patient
Your patient's history of ARDS (2016) represents prior permeability edema with diffuse alveolar damage, but his current clear lung examination indicates complete resolution. 4 ARDS typically requires 8-11 days of mechanical ventilation and can follow diverse insults including severe viral illness, as in your patient's case 4.
Regarding His Severe Nasal Drainage
The severe nasal drainage is unrelated to pulmonary edema and instead represents upper airway pathology—most likely chronic rhinosinusitis, vasomotor rhinitis, or postnasal drip syndrome (now termed upper airway cough syndrome). 5
Key diagnostic considerations for his nasal symptoms include 5:
- Chronic rhinosinusitis: Requires ≥12 weeks of symptoms including mucopurulent drainage and nasal obstruction 5
- Vasomotor rhinitis: Characterized by excessive watery secretions triggered by irritants, temperature changes, or odors—highly relevant given his marijuana smoking via torch/bong 5
- Rhinitis from physical/chemical irritants: Chronic smoke exposure from marijuana combustion can cause persistent rhinitis 5
- Fungal involvement: Given his severe bilateral fungal infection of hands/feet, consider fungal rhinosinusitis, though this typically requires endoscopic evaluation 5
Critical Pitfalls
Do not confuse his past ARDS with current pulmonary status. His clear lungs indicate no active pulmonary edema. The nasal drainage represents upper airway disease requiring separate evaluation—consider nasal endoscopy and CT sinuses if symptoms persist despite empiric treatment with intranasal corticosteroids and saline irrigation 5.
The marijuana smoking method (torch/bong) produces significant thermal and chemical irritation that likely contributes substantially to his nasal symptoms 5, though he declined cessation counseling.