Respiratory

Pneumothorax: spontaneous vs traumatic, management algorithm

Clinical Overview and When to Suspect Pneumothorax

— Primary spontaneous (PSP): no underlying lung disease; classic patient is a tall, thin, young male smoker 18–40 years old, often from subpleural apical bleb rupture

— Secondary spontaneous (SSP): underlying lung disease — COPD (most common), cystic fibrosis, TB, Pneumocystis pneumonia in HIV, lung cancer, LAM, Birt-Hogg-Dubé, Marfan, Ehlers-Danlos

— Traumatic: blunt (rib fracture lacerating pleura) or penetrating (stab, GSW)

— Iatrogenic: subclavian/IJ central line, transthoracic biopsy, thoracentesis, mechanical ventilation barotrauma, pacemaker placement

— Tension PTX: any of the above with one-way valve → progressive intrapleural pressure → mediastinal shift, decreased venous return, obstructive shock

— Catamenial: recurrent PTX in menstruating women due to thoracic endometriosis

— Sudden unilateral pleuritic chest pain + dyspnea, especially after coughing, weightlifting, scuba diving, or air travel

— Post-procedure hypoxia after central line placement or thoracentesis

— Trauma patient with chest wall injury and hypotension unresponsive to fluids

— Ventilated patient with sudden rise in peak airway pressures and drop in BP

Pneumothorax (PTX) = air in the pleural space causing partial or complete lung collapse; ranges from incidental small apical blebs to life-threatening tension physiology

Classification drives management:

When to suspect on Step 3 vignettes:

Step 3 management: Tension PTX is a clinical diagnosis — do NOT wait for chest X-ray. Immediate needle decompression (or finger thoracostomy) followed by tube thoracostomy is the correct CCS order before any imaging

Board pearl: Recurrence risk after first PSP is ~30% within 1 year; recurrence after SSP carries much higher mortality due to limited pulmonary reserve, which is why definitive procedures (VATS pleurodesis) are offered earlier in SSP

Outpatient counseling: smoking cessation reduces recurrence ~4-fold and is the single highest-yield long-term intervention

Presentation Patterns and Key History

— Onset typically at rest (not during exertion, contrary to intuition)

— Tall, thin male, 10–30 years old, smoker; family history in ~10%

— Symptoms may be mild and self-limiting; some patients delay presentation by days

— Older patient with known COPD, prior TB, cystic fibrosis, or HIV/AIDS with prior PCP

— Even small PTX causes severe dyspnea because of poor baseline reserve — do not be falsely reassured by small size

— Blunt: MVC, fall from height — look for rib fractures, flail chest, pulmonary contusion

— Penetrating: stab/GSW — assume hemopneumothorax until proven otherwise

— Delayed PTX can appear 24–48 hours post-trauma

— Smoking (RR ~20× in heavy smokers), cannabis use

— Barotrauma: scuba diving ascent, high-altitude flight, valsalva, vigorous cough

— Connective tissue disease: Marfan, Ehlers-Danlos, homocystinuria

— Menstrual cycle timing → catamenial PTX (within 72 h of menses, right-sided in 90%)

— Progressive dyspnea, tachycardia >120, hypotension, altered mental status

— Distended neck veins, tracheal deviation away from affected side (late finding)

Classic symptom triad: sudden-onset ipsilateral pleuritic chest pain, dyspnea, and dry cough — pain often radiates to the shoulder (phrenic referral)

Primary spontaneous PTX:

Secondary spontaneous PTX:

Traumatic PTX:

Iatrogenic clues: recent subclavian line, transbronchial biopsy, acupuncture, positive-pressure ventilation, nerve block (supraclavicular brachial plexus)

Triggers / risk amplifiers:

Red flags suggesting tension physiology:

Key distinction: Acute MI vs PTX — both present with sudden chest pain and dyspnea, but PTX pain is pleuritic (worse with inspiration) and unilateral, while MI is pressure-like, substernal, and often radiates to arm/jaw with diaphoresis. ECG and bedside ultrasound rapidly differentiate

Board pearl: Ask every young chest-pain patient about marijuana use, scuba diving, and recent air travel — these often unlock the diagnosis on vignettes

Physical Exam Findings (and Hemodynamic Assessment when relevant)

— Tachypnea, accessory muscle use, asymmetric chest expansion (decreased on affected side)

— In trauma: chest wall ecchymoses, paradoxical motion (flail chest), penetrating wounds, subcutaneous emphysema ("Rice Krispies" crepitus)

— Decreased tactile fremitus over PTX (air conducts poorly)

— Tracheal deviation toward affected side in atelectasis but away in tension PTX

— Crepitus from subcutaneous air extending to neck/face

— Simple PTX: usually normotensive, mild tachycardia, SpO₂ may be normal or mildly reduced

— Tension PTX: hypotension, tachycardia >120, JVD, hypoxia, severe respiratory distress, ultimately PEA arrest from obstructive shock

— Pulsus paradoxus may be present

— Ventilated patient: sudden ↑ peak inspiratory pressure, ↓ tidal volumes, ↓ BP, ↓ SpO₂ — assume tension until proven otherwise

— Trauma: perform eFAST including bilateral pleural views; absent lung sliding is highly sensitive

Inspection:

Palpation:

Percussion: hyperresonant on affected side — the single most specific exam finding

Auscultation: diminished or absent breath sounds ipsilaterally; no adventitious sounds

Hemodynamic assessment — distinguishing simple from tension PTX:

Hamman's crunch: crackling sound synchronous with heartbeat — suggests pneumomediastinum (often from Boerhaave or barotrauma), not PTX itself

Special exam scenarios:

CCS pearl: In a CCS trauma case, your first orders should be airway, breathing (look/listen/feel), circulation with simultaneous large-bore IV access, 100% O₂, and cardiac monitor — before ordering imaging. If exam suggests tension PTX, the next order is needle decompression at the 2nd intercostal space midclavicular line (or 5th ICS anterior axillary per updated ATLS), followed immediately by tube thoracostomy

Board pearl: Hyperresonance + absent breath sounds + hypotension = tension PTX. Skip the chest X-ray; decompress

Diagnostic Workup — Initial Labs / Imaging / ECG / Biomarkers

— Visceral pleural line with absent lung markings peripherally

— Deep sulcus sign on supine film (lucent costophrenic angle) — easily missed

— Measure size: British Thoracic Society uses interpleural distance at hilum (>2 cm = large); ACCP uses apex-to-cupula distance (>3 cm = large)

— Look for: rib fractures, subcutaneous emphysema, mediastinal shift, hydropneumothorax (air-fluid level)

— Highly sensitive (>90%) and specific for PTX, superior to supine CXR

— Findings: absent lung sliding, absent comet-tail artifacts, presence of "lung point" (pathognomonic)

— M-mode: "barcode/stratosphere sign" replaces normal "seashore sign"

— Left PTX: decreased precordial R-wave amplitude, T-wave inversions, right-axis deviation, low voltage — can mimic anterior MI or PE

Imaging is the cornerstone — labs are supportive only

Upright PA chest X-ray = first-line for hemodynamically stable patients:

Expiratory films: no longer routinely recommended — minimal added sensitivity

Supine CXR in trauma: PTX may only manifest as deep sulcus sign or relative lucency — low sensitivity (~50%)

Bedside lung ultrasound (eFAST):

CT chest: gold standard; detects occult PTX missed on CXR; used for trauma, complex cases, preoperative planning, recurrent PTX evaluating blebs

ECG findings (often nonspecific but tested):

ABG: hypoxemia, respiratory alkalosis from hyperventilation; not required for diagnosis but useful in SSP to gauge severity

Basic labs: CBC, BMP, coagulation studies (pre-procedural), type and screen if trauma

Key distinction: Large bulla vs PTX — bullae have concave inner margins following lung contour; PTX shows a sharp convex visceral pleural line. Inserting a chest tube into a bulla is a classic iatrogenic disaster — get CT if uncertain

Board pearl: In ventilated or unstable patients, ultrasound at the bedside beats waiting for portable CXR. Absent lung sliding + lung point = diagnostic

Diagnostic Workup — Advanced or Confirmatory Studies

— Recurrent PSP → identify blebs/bullae, surgical planning

— Suspected secondary PTX → characterize underlying lung disease (emphysema, cystic lung disease, LAM, PCP cysts)

— Trauma → detect occult PTX, hemothorax volume, associated injuries (aortic, diaphragmatic)

— Suspected complication: persistent air leak, malpositioned chest tube, empyema, bronchopleural fistula

— Pre-VATS evaluation

— FLCN gene testing for Birt-Hogg-Dubé

— Connective tissue evaluation: Marfan (FBN1), vascular Ehlers-Danlos (COL3A1) — critical because surgical risk and recurrence are high

— Refer to genetics if family history or syndromic features

CT chest (non-contrast) — indications beyond initial diagnosis:

High-resolution CT (HRCT): when underlying interstitial/cystic lung disease suspected — LAM (premenopausal women, chylothorax, renal AMLs), Birt-Hogg-Dubé (basilar cysts, renal tumors, skin fibrofolliculomas), Langerhans cell histiocytosis (smokers, upper lobe nodules/cysts)

Pleural fluid analysis (if hydropneumothorax present): cell count, gram stain, culture, cytology, pH, glucose — rule out empyema, hemothorax, malignant effusion

Bronchoscopy: persistent air leak >5–7 days, suspected airway injury post-trauma, foreign body, central airway obstruction

Echocardiography: when tension PTX is on the differential with shock, or to exclude pericardial tamponade (also causes obstructive shock)

Genetic/specialist evaluation for recurrent or familial PTX:

In HIV patients with PTX: high suspicion for PCP — send induced sputum or BAL for Pneumocystis, LDH, beta-D-glucan; start empiric TMP-SMX + steroids if PaO₂ <70

In menstruating women with recurrent right-sided PTX: pelvic exam, gyn referral for catamenial PTX → diaphragmatic endometriosis, often requires hormonal suppression + VATS

Step 3 management: After second ipsilateral spontaneous PTX, or first contralateral PTX, refer for VATS bleb resection with pleurodesis — this is the inflection point on board questions

Board pearl: Bilateral simultaneous PTX in a thin young man → think Marfan or vascular EDS; image the aorta

Risk Stratification or First-Line Management Logic

— Immediate needle decompression → tube thoracostomy (chest tube), do not wait for imaging

— Resuscitate, secure airway as needed

— Small (<2 cm BTS / <3 cm ACCP) and asymptomatic: observation 4–6 hours with supplemental O₂ (accelerates pleural air resorption ~4×), repeat CXR, discharge if stable with 24–48 h follow-up

— Large or symptomatic: needle aspiration (14–16G catheter, 2nd ICS MCL) OR small-bore chest tube (8–14 Fr pigtail)

— Recent BTS 2023 guidelines allow conservative outpatient management of selected stable PSP regardless of size (Hallifax NEJM 2020 trial: noninferior to intervention with fewer complications)

— Almost always admit — even small PTX

— Tube thoracostomy preferred over aspiration; higher failure rate with aspiration due to diseased lung

— Early thoracic surgery consult given high recurrence and mortality

— Any size with hemodynamic instability, hemothorax, or need for positive-pressure ventilation → chest tube (28–32 Fr if hemothorax, smaller if pure PTX)

— Occult PTX (CT only, not on CXR) in stable patient without PPV → observation often acceptable

— Penetrating chest trauma → chest tube before intubation if possible (PPV converts simple to tension)

Algorithm hinges on three questions: (1) stable or unstable? (2) primary or secondary? (3) small or large?

Unstable / tension PTX (any etiology):

Primary spontaneous PTX (PSP) — stable patient:

Secondary spontaneous PTX (SSP):

Traumatic PTX:

Iatrogenic PTX: most resolve with observation ± aspiration; chest tube if large, symptomatic, or ventilated

Catamenial PTX: chest tube acutely; long-term hormonal suppression (GnRH agonists, OCPs) + VATS

Step 3 management: Surgical referral (VATS bleb resection + mechanical/chemical pleurodesis) indications: 2nd ipsilateral PTX, 1st contralateral, bilateral, persistent air leak >5–7 days, hemopneumothorax, high-risk occupations (pilots, divers — even after first episode)

Board pearl: Air travel and diving are absolutely contraindicated until radiographic resolution; lifetime diving ban after PTX unless definitive surgical repair

Pharmacotherapy — First-Line Drug Regimen

— High-flow O₂ (10–15 L/min non-rebreather) for all PTX patients, even if SpO₂ normal

— Mechanism: nitrogen washout creates partial pressure gradient → pleural air resorbs ~4× faster (~1.25%/day → ~4–5%/day)

— Caution in COPD/SSP: use lowest FiO₂ achieving target SpO₂ 88–92% to avoid CO₂ retention

— Pleuritic pain limits inspiration → atelectasis, hypoventilation

— Acetaminophen + NSAIDs (ibuprofen, ketorolac) first-line

— Opioids (morphine, hydromorphone) for severe pain or post-procedure; use cautiously to avoid respiratory depression

— Intercostal nerve blocks or thoracic epidural for rib fracture-associated PTX

— Trauma: 24-hour prophylaxis with cefazolin reduces empyema/pneumonia (EAST guidelines, weak recommendation)

— Non-trauma elective tube: not routinely indicated

— Talc (most effective, gold standard for malignant effusion-related PTX)

— Doxycycline (preferred for benign recurrent PTX, especially younger patients to preserve lung for future surgery)

— Premedicate with analgesia and lidocaine — procedure is intensely painful

— Varenicline (most effective monotherapy), bupropion, nicotine replacement (patch + gum/lozenge combination)

— Begin during admission; arrange behavioral counseling

— GnRH agonists (leuprolide) or combined OCPs suppress endometrial implants

— Often combined with VATS pleurodesis

— Routine systemic anticoagulation cessation isn't required, but hold for procedures per usual periprocedural protocols

— Bronchodilators only if underlying COPD/asthma

PTX is primarily a procedural disease — pharmacotherapy is adjunctive but tested

Supplemental oxygen — therapeutic, not just supportive:

Analgesia:

Antibiotic prophylaxis with chest tube:

Chemical pleurodesis agents (instilled via chest tube or at VATS):

Smoking cessation pharmacotherapy — single highest-yield long-term intervention:

Hormonal therapy for catamenial PTX:

Avoid:

Board pearl: Supplemental O₂ is not optional — it actively speeds resorption. Even patients with normal saturation get it

Step 3 management: Initiate varenicline + counseling before discharge in every smoker with PSP; document smoking cessation as a quality measure

Procedures / Revascularization / Invasive Management

— 2nd ICS midclavicular line (traditional) OR 4th–5th ICS anterior axillary line (updated ATLS — better penetration in obese/muscular adults)

— 14G angiocatheter, ≥5 cm length; listen for rush of air; convert to chest tube ASAP

— Triangle of safety: lateral border pectoralis major, anterior border latissimus dorsi, 5th ICS, base of axilla

— Small-bore pigtail (8–14 Fr) for simple PTX — equally effective as large-bore, less painful

— Large-bore (28–36 Fr) for hemothorax, empyema, bronchopleural fistula, ventilated patients

— Connect to underwater seal ± wall suction (–20 cmH₂O)

— Confirm position with CXR; verify air column movement with respiration

— First-line option for stable PSP in some guidelines (BTS); avoids tube

— Success rate ~60–70% for PSP, <40% for SSP

— Indications: 2nd ipsilateral PTX, 1st contralateral, bilateral, persistent air leak >5–7 days, failure to re-expand, hemopneumothorax, high-risk occupation, tension PTX, large bullae on CT

— Components: bullectomy/blebectomy + mechanical pleurodesis (pleural abrasion) ± chemical pleurodesis (talc/doxycycline) or pleurectomy

— Reduces recurrence from ~30% to <5%

— Criteria: no air leak × 24 h, lung fully re-expanded, drainage <100–200 mL/24 h

— Remove at end-expiration or during Valsalva; occlusive dressing; CXR 1–4 h post-removal

Needle decompression (tension PTX, temporizing):

Tube thoracostomy (chest tube):

Needle aspiration:

Heimlich (one-way) valve: enables outpatient management of small PSP; ambulatory device for selected patients

VATS (video-assisted thoracoscopic surgery) — definitive:

Open thoracotomy: reserved for massive hemothorax (>1500 mL initial or >200 mL/hr × 4 h), tracheobronchial injury, esophageal injury

Chest tube removal:

CCS pearl: Order sequence for tension PTX: (1) needle decompression → (2) tube thoracostomy → (3) confirmatory CXR → (4) admit/monitor. Reverse this order on a CCS case and you lose points

Board pearl: Persistent air leak >5–7 days = bronchopleural fistula → VATS

Special Populations — Elderly and Renal/Hepatic Impairment

— PTX in elderly is almost always secondary (COPD, malignancy, interstitial lung disease)

— Higher mortality (10–15% in SSP vs <1% in PSP) due to limited pulmonary reserve

— Symptoms may be atypical: confusion, fatigue, falls rather than classic pleuritic pain

— Lower threshold for admission, chest tube, and ICU monitoring

— Pain control balanced against delirium risk from opioids; consider scheduled acetaminophen + low-dose opioids + regional anesthesia

— Procedural risks elevated: bleeding (anticoagulation, antiplatelets), poor wound healing, malnutrition

— Pleurodesis decision-making: weigh recurrence risk against surgical morbidity; many elderly patients undergo chemical pleurodesis via chest tube rather than VATS

— Code status discussion before invasive intervention is essential

— Increased bleeding risk from uremic platelet dysfunction → desmopressin (DDAVP) 0.3 mcg/kg IV before chest tube if uremic and bleeding concern

— Contrast-enhanced CT generally avoided; non-contrast CT chest is fine for PTX evaluation

— Drug dosing: adjust opioids (avoid morphine → active metabolites accumulate; prefer hydromorphone, fentanyl), enoxaparin (reduce or use UFH if CrCl <30), NSAIDs generally avoided in CKD

— Hemodialysis patients: PTX risk elevated post-IJ catheter placement; use ultrasound guidance

— Coagulopathy + thrombocytopenia → increased procedural bleeding; transfuse platelets to >50K and consider FFP/4-factor PCC if INR markedly elevated and active bleed

— Hepatic hydrothorax can coexist with PTX → hydropneumothorax; manage underlying portal hypertension

— Avoid acetaminophen doses >2 g/day in severe cirrhosis; NSAIDs contraindicated (variceal bleed, hepatorenal syndrome)

— Sedation/analgesia: reduce dosing; avoid benzodiazepines (precipitate encephalopathy)

— Reverse if possible before non-emergent chest tube: vitamin K + 4F-PCC for warfarin; idarucizumab for dabigatran; andexanet alfa for apixaban/rivaroxaban

— In emergencies (tension PTX), do not delay decompression for reversal

Elderly patients:

Renal impairment (CKD/ESRD):

Hepatic impairment / cirrhosis:

Anticoagulated patients:

Step 3 management: In an elderly COPD patient with first SSP, admit, place small-bore chest tube, consult thoracic surgery early — recurrence risk is high and second episode mortality is significant. Discuss VATS vs chemical pleurodesis based on functional status

Special Populations — Pregnancy, Pediatrics, and Other Subgroups

— Rare but high-stakes; physiologic changes (↑ tidal volume, ↑ chest wall compliance, elevated diaphragm) may delay diagnosis

— CXR is safe with abdominal shielding (<0.1 mGy fetal dose, well below 50 mGy threshold)

— CT chest acceptable if needed for diagnosis or trauma

— Management mirrors non-pregnant: O₂, aspiration or small-bore chest tube, surgical consult for recurrent

— Avoid: NSAIDs in 3rd trimester (premature ductus closure), tetracyclines (teratogenic — so doxycycline pleurodesis contraindicated; use talc)

— Delivery planning: in late pregnancy with active or recent PTX, avoid Valsalva → consider assisted second stage (forceps/vacuum) or elective C-section; epidural anesthesia preferred over general (avoids PPV)

— Catamenial PTX may flare or remit during pregnancy

— Neonatal PTX: common in RDS, meconium aspiration, mechanical ventilation; transillumination of chest can be diagnostic

— Adolescent PSP: identical to adult PSP — tall, thin males; same algorithm

— Consider underlying syndromes (cystic fibrosis, Marfan) — get sweat chloride if recurrent

— Chest tube sizing: smaller bore appropriate; pigtails common

— PTX = poor prognostic marker; affects lung transplant candidacy

— Avoid pleurodesis if transplant candidate (creates surgical adhesions complicating explant)

— Discuss with transplant center before intervention

— Suspect PCP with any PTX in immunocompromised patient — treat with TMP-SMX + prednisone if PaO₂ <70 or A-a gradient >35

— Chest tubes have high failure rate; persistent air leaks common

— Pilots (commercial and military), divers, astronauts: even single PSP often warrants definitive surgical pleurodesis before return to duty

— FAA requires documented resolution + often surgical fixation before reinstatement

— Diving carries lifelong restriction unless surgical pleurodesis with documented integrity

Pregnancy:

Pediatrics:

Cystic fibrosis patients:

HIV / AIDS:

Athletes and high-risk occupations:

Board pearl: HIV + PTX = PCP until proven otherwise. Get LDH, induced sputum, start empiric TMP-SMX + steroids

Step 3 management: Counsel all PTX patients to avoid air travel for 1–2 weeks after radiographic resolution and to permanently avoid scuba diving unless surgically corrected

Complications and Adverse Outcomes

— PSP: ~30% within 1 year, ~50% lifetime without definitive surgery

— SSP: ~40–55% recurrence; each episode carries 1–17% mortality

— Risk factors: continued smoking, tall stature, persistent blebs on CT, female sex (in some studies)

— Bleeding from torn pleural adhesions or intercostal vessels

— Massive: >1500 mL initial output or >200 mL/hr × 4 h → emergent thoracotomy

— >5–7 days of continuous air leak through chest tube

— Management: VATS, blood patch pleurodesis, endobronchial valves

— Occurs after rapid re-expansion of chronically collapsed lung (>72 h collapse, large PTX, rapid drainage)

— Unilateral pulmonary edema on the side of the PTX within minutes to hours of drainage

— Prevention: avoid suction initially; use water seal; drain gradually

— Treatment: supportive, supplemental O₂, diuretics, occasionally ventilatory support

— Malposition (intraparenchymal, subcutaneous, subdiaphragmatic — liver/spleen laceration)

— Infection: cellulitis, empyema (1–25% incidence)

— Pain, intercostal neuralgia

— Refractory air leak from tube perforating lung

— Vascular injury (intercostal artery, internal mammary)

Tension pneumothorax: progression of any PTX with one-way valve mechanism → obstructive shock, cardiac arrest; mortality high if not immediately decompressed

Recurrence:

Hemopneumothorax:

Persistent air leak / bronchopleural fistula:

Re-expansion pulmonary edema:

Chest tube complications:

Empyema: more common after traumatic PTX with retained hemothorax — drain retained blood within 72 hours, consider intrapleural tPA + DNase or VATS

Subcutaneous emphysema: usually benign but can be massive ("Michelin man") → ensure chest tube patency, occasionally needs blow-hole or larger tube

Pneumomediastinum / pneumopericardium: from barotrauma; usually self-limited

Mortality: PSP <1%; SSP 10–15%; trauma-related varies by associated injuries

Key distinction: Re-expansion pulmonary edema vs ARDS — RE pulmonary edema is ipsilateral, occurs immediately post-drainage, and follows known prolonged collapse with rapid evacuation; ARDS is bilateral and tied to systemic insult

Board pearl: To prevent re-expansion pulmonary edema in chronic large PTX, drain via water seal without suction for the first hours and avoid evacuating large volumes rapidly

When to Escalate Care — ICU, Consult, or Inpatient Triage

— Tension PTX (post-decompression observation)

— Bilateral PTX

— Hemodynamic instability, vasopressor requirement

— Mechanical ventilation requirement

— Massive hemopneumothorax

— Severe underlying lung disease (SSP with PaO₂ <60 or PaCO₂ rising)

— Re-expansion pulmonary edema

— Polytrauma with PTX

— Stable SSP requiring chest tube

— Large PSP requiring chest tube

— Significant comorbidities (advanced age, CKD, CHF)

— Stable PSP with chest tube/pigtail, no respiratory compromise

— Trauma PTX without other indications for higher level

— Small asymptomatic PSP for observation

— Selected stable PSP with Heimlich valve and reliable follow-up (newer pathway)

— Thoracic surgery:

— 2nd ipsilateral PTX, 1st contralateral, bilateral simultaneous

— Persistent air leak >5–7 days

— Failure of lung re-expansion >72 h

— Hemopneumothorax requiring operative management

— High-risk occupation (pilot, diver) after first PTX

— Suspected underlying surgical pathology (bullae, malignancy)

— Pulmonology: SSP, recurrent PTX, suspected underlying lung disease, cystic lung disease workup

— Interventional radiology: image-guided pigtail placement in difficult anatomy or loculated collections

— Trauma surgery: penetrating chest trauma, polytrauma

— Cardiothoracic: suspected aortic, tracheobronchial, or esophageal injury

— Genetics: familial PTX, suspected Birt-Hogg-Dubé, Marfan, vEDS

— Gynecology: catamenial PTX

— OB: pregnant patient with PTX

— Infectious disease: HIV/PCP, TB-related PTX

— Bronchoscopic intervention required (endobronchial valves for persistent air leak)

— Cystic fibrosis with PTX (transplant program coordination)

— Pediatric or pregnancy-specific expertise needed

ICU admission indications:

Step-down/telemetry:

General ward:

Outpatient/observation:

Consults:

Transfer to tertiary center:

CCS pearl: On CCS cases, escalation orders include "Admit to ICU," "Consult thoracic surgery," "Continuous cardiac monitoring," "Pulse oximetry," "Arterial line" — and don't forget DVT prophylaxis, GI prophylaxis, and nutrition orders

Board pearl: Second ipsilateral PTX = surgical referral, no exceptions

Key Differentials — Same-Category Causes (Pulmonary)

— Sudden pleuritic chest pain + dyspnea + hypoxia — mimics PTX

— Distinguishing: PE typically has clear lungs on CXR, normal-to-increased breath sounds; D-dimer elevated; CT-PA diagnostic

— Wells score or PERC rule for risk stratification

— Pleuritic pain + dyspnea but with fever, productive cough, leukocytosis, infiltrate on CXR

— Breath sounds present (often with crackles), not absent

— Dyspnea + decreased breath sounds, but dull to percussion (vs hyperresonant in PTX)

— Decreased tactile fremitus in both

— Bilateral wheezing, prolonged expiratory phase

— Always rule out PTX in COPD patient with sudden worsening dyspnea — PTX can be missed and is catastrophic

— Hypoxia, crackles, infiltrate; often coexists with PTX

— Often a complication, not a primary diagnosis; persistent air leak post-PTX or post-pneumonectomy

— Penetrating or blunt trauma; massive PTX with persistent large air leak despite functioning chest tube; subcutaneous emphysema disproportionate to PTX size

— Bronchoscopy diagnostic; surgical repair

— Substernal pain, Hamman's crunch, subcutaneous emphysema; CXR shows mediastinal air outlining structures

— Causes: spontaneous (cough, vomiting, valsalva), Boerhaave esophageal rupture, asthma, marijuana/cocaine inhalation, barotrauma

— Can mimic PTX on CXR — bulla has concave inner border following lung contour; PTX has convex visceral pleural line

— CT distinguishes; chest tube into bulla = disaster (creates iatrogenic bronchopleural fistula)

— Bowel in chest on CXR; mimics hydropneumothorax; CT or upper GI study diagnostic

Pulmonary embolism (PE):

Pneumonia / pleurisy:

Pleural effusion:

Asthma / COPD exacerbation:

Pulmonary contusion (in trauma):

Bronchopleural fistula:

Tracheobronchial injury:

Pneumomediastinum:

Large emphysematous bulla:

Diaphragmatic rupture (trauma):

Key distinction: Hyperresonance + absent breath sounds = PTX; dullness + absent breath sounds = effusion/hemothorax. Same auscultation, opposite percussion

Board pearl: Never insert a chest tube based on CXR alone if a giant bulla is in the differential — get CT first unless patient is unstable

Key Differentials — Other-Category Causes (Non-Pulmonary)

— Substernal pressure, radiating to arm/jaw, diaphoresis, nausea

— ECG, troponin distinguish; left PTX can mimic anterior MI on ECG (precordial T-wave inversions, axis shift)

— Always get ECG in chest pain, but don't anchor — CXR/ultrasound rules out PTX

— Sudden tearing chest/back pain, pulse deficits, widened mediastinum on CXR

— CT angiography diagnostic; can coexist with traumatic PTX

— Pleuritic chest pain relieved by leaning forward (pericarditis); muffled heart sounds, JVD, pulsus paradoxus, hypotension (tamponade)

— Tamponade and tension PTX both cause obstructive shock — bedside ultrasound distinguishes

— Beck's triad: hypotension, JVD, muffled heart sounds

— Severe retrosternal pain after forceful vomiting; left pleural effusion ± pneumomediastinum; Hamman's crunch

— Gastrografin esophagram or CT with oral contrast; surgical emergency

— Reproducible with palpation; benign; diagnosis of exclusion in young patients

— Often coexists with traumatic PTX; flail chest if ≥3 contiguous ribs in ≥2 places

— Dermatomal pain preceding vesicular rash by 2–4 days; can mimic pleuritic chest pain

— Tachypnea, chest tightness, tingling, perioral numbness; normal exam and CXR

— Diagnosis of exclusion in young patients

— Substernal burning, related to meals, responds to antacids

— Dyspnea, syncope, RV strain on ECG/echo

— Kussmaul respirations, fruity breath, high glucose, anion gap; can be confused with respiratory distress

Acute coronary syndrome (MI):

Aortic dissection:

Pericarditis / cardiac tamponade:

Esophageal rupture (Boerhaave):

Musculoskeletal chest pain / costochondritis:

Rib fracture:

Herpes zoster (preeruption):

Panic attack / hyperventilation syndrome:

GERD / esophageal spasm:

Pulmonary hypertension crisis:

Diabetic ketoacidosis (in adolescents/young adults with dyspnea):

Key distinction: Tension PTX vs cardiac tamponade — both cause JVD + hypotension + tachycardia. PTX: unilateral hyperresonance, absent breath sounds, tracheal deviation. Tamponade: muffled heart sounds, pulsus paradoxus, equal breath sounds. Bedside echo and ultrasound differentiate in seconds

Board pearl: A trauma patient with shock and JVD has tension PTX or tamponade until proven otherwise — bedside US is your friend

Secondary Prevention / Discharge Medications / Long-Term Plan

— Recurrence drops ~4× in those who quit

— Initiate before discharge: varenicline (start 1 wk before quit date, titrate; most effective monotherapy), bupropion SR, or nicotine replacement therapy (combination patch + short-acting form)

— Behavioral counseling + quitline referral (1-800-QUIT-NOW)

— Document smoking status as quality measure

— No air travel until radiographic resolution + 1–2 weeks (most guidelines say 1 week after full resolution; BTS suggests 7 days; FAA varies)

— No scuba diving — ever unless definitive surgical pleurodesis with documented integrity (lifetime restriction otherwise)

— Avoid heavy lifting, valsalva, strenuous exercise for 2–4 weeks

— Avoid wind instruments and high-altitude exposure (>8000 ft) for several weeks

— Analgesia: scheduled acetaminophen + as-needed NSAID + short-course opioid only if needed (Step 3 emphasizes opioid stewardship — limit to <3 days where possible)

— Continue inhalers if underlying COPD/asthma

— Smoking cessation pharmacotherapy

— Bowel regimen if on opioids

— VTE prophylaxis if reduced mobility

— Discuss for all SSP, recurrent PSP, high-risk occupations

— Reduces recurrence from 30% to <5%

— Outpatient CXR at 2 weeks and 6 weeks post-discharge

— Pulmonology referral for SSP, recurrent PTX, suspected underlying lung disease

— Genetics referral if syndromic features or familial pattern

— Address modifiable factors: smoking, marijuana, cocaine, body weight (low BMI is risk factor)

— Influenza annually, pneumococcal (PCV20 or PCV15+PPSV23) per age/comorbidity, COVID boosters

— Especially important in SSP/COPD patients

Smoking cessation — THE single most important intervention:

Activity restrictions on discharge:

Discharge medications:

Pleurodesis/VATS counseling for recurrence prevention:

Long-term follow-up planning:

Vaccinations:

Step 3 management: At discharge, ensure: (1) smoking cessation plan, (2) CXR in 2 weeks, (3) pulmonology/thoracic surgery referral if indicated, (4) activity restrictions explained in writing, (5) return precautions for recurrence (sudden chest pain/dyspnea), (6) avoid air travel/diving

Board pearl: Counsel pilots, divers, and military personnel that even one PTX may end their career without surgical fixation — discuss occupational implications early

Follow-Up, Monitoring Parameters, and Rehab/Counseling

— Continuous pulse oximetry, vital signs q4h

— Chest tube parameters: air leak (column oscillation, bubbling in water seal chamber), drainage volume/character, tidaling (respiratory variation in fluid column)

— Daily CXR initially, then as clinically indicated

— Pain assessment and analgesia titration

— Incentive spirometry q1h while awake to prevent atelectasis

— No air leak for ≥24 hours

— Lung fully re-expanded on CXR

— Drainage <100–200 mL/24 h (varies by institution)

— Patient off positive-pressure ventilation

— Remove at end-expiration or during Valsalva; CXR 1–4 hours after removal

— Observe 4–6 hours, repeat CXR

— Discharge if stable; counsel on return precautions

— 2 weeks post-discharge: clinic visit + CXR — assess symptoms, confirm radiographic resolution

— 6 weeks: repeat CXR if persistent abnormalities at 2 weeks, or sooner if symptomatic

— Pulmonology/thoracic surgery follow-up for definitive management discussion if SSP or recurrent

— Sudden chest pain, worsening dyspnea, fever, redness/drainage at tube site → ED

— Recurrence presents identically to initial episode

— Indicated for SSP patients with COPD or significant underlying lung disease

— Improves exercise tolerance, QOL, reduces exacerbations

— Smoking cessation (revisit at every visit)

— Drug avoidance: marijuana, cocaine, inhalants

— Recreational restrictions: diving, skydiving, high-altitude activities

— Sexual activity and Valsalva activities: generally avoid 2–4 weeks

— Return to work: sedentary work 1–2 weeks; heavy labor 4–6 weeks

— Future pregnancy planning if applicable

— Smoking cessation counseling documented

— Appropriate vaccines administered

— Follow-up arranged before discharge

Inpatient monitoring (while chest tube in place):

Chest tube removal criteria:

Post-removal monitoring:

Outpatient follow-up cadence:

Return precautions (clear discharge instructions):

Pulmonary rehabilitation:

Counseling topics:

Quality measures:

CCS pearl: On CCS, advance the clock to 2 weeks for outpatient follow-up and order CXR, then assess smoking cessation success and address recurrence-prevention referral

Board pearl: Persistent radiographic abnormality at 6 weeks warrants CT chest to evaluate for underlying bullae, mass, or unresolved process

Ethical, Legal, and Patient Safety Considerations

— Chest tube/VATS: discuss risks (bleeding, infection, organ injury, recurrence, persistent air leak, chronic pain), benefits, alternatives

— Emergent tension PTX: implied consent applies — decompression is life-saving and cannot wait for formal consent; document clinical reasoning

— Pleurodesis: ensure patient understands it eliminates future potential for lung transplantation in some cases (CF patients especially)

— Hypoxia and pain can impair capacity — reassess after stabilization

— Adolescent assent for PSP procedures; parental consent required

— Penetrating chest trauma (gunshot, stabbing) → notify law enforcement per state law

— Suspected intimate partner violence or child abuse if injury pattern doesn't fit history

— When PTX results from central line, biopsy, or thoracentesis: transparent disclosure to patient and family is ethically and legally required

— Document procedure indication, technique, complication, response

— Quality improvement reporting; not all iatrogenic complications are negligence

— Use ultrasound guidance for central line placement (reduces PTX risk by ~50%)

— Time-out and site verification before procedures — wrong-side chest tube is a never event

— Standardized chest tube insertion checklists reduce complications

— Safe handoff: communicate chest tube parameters, suction settings, last CXR at every shift change

— Discharging a PTX patient without confirmed follow-up CXR is a high-liability error

— Ensure clear written instructions on return precautions, activity restrictions, and travel avoidance

— Medication reconciliation — especially anticoagulants if held periprocedurally

— Confirm patient has primary care follow-up arranged before discharge

— Document that diving and flying restrictions were discussed (especially pilots — FAA certification implications)

— Failure to counsel about diving risk is a known malpractice exposure

— Avoid routine repeated CXRs once stable; choose pigtail over large-bore tube when appropriate (reduced pain, faster discharge, lower cost)

— Frail elderly with recurrent SSP from end-stage COPD: discuss goals of care, palliative options (Heimlich valve for comfort, avoid repeated invasive procedures)

Informed consent for procedures:

Capacity assessment:

Mandatory reporting:

Iatrogenic PTX disclosure:

Patient safety / systems issues:

Transition-of-care risks (Step 3 emphasis):

Occupational and travel counseling — legal implications:

Resource stewardship:

End-of-life considerations:

Step 3 management: Document specifically that you counseled the patient on (1) air travel restriction, (2) diving avoidance, (3) smoking cessation, and (4) return precautions — this is a tested transition-of-care competency

High-Yield Associations and Rapid-Fire Clinical Facts

— Bilateral PTX

— Recurrent (2nd ipsilateral or 1st contralateral)

— Air leak persistent >5–7 days

— Ventilation requirement / non-re-expansion

— Occupational risk (pilot, diver)

— 2nd episode

Demographics: PSP — tall, thin, male, smoker, 18–40 yo

Marfan syndrome (FBN1): tall stature, arachnodactyly, lens dislocation, aortic root dilation, PTX risk elevated

Vascular Ehlers-Danlos (COL3A1): thin translucent skin, easy bruising, arterial/uterine rupture, PTX

Birt-Hogg-Dubé (FLCN): skin fibrofolliculomas, basilar lung cysts, renal tumors (chromophobe RCC, oncocytoma), recurrent PTX

Lymphangioleiomyomatosis (LAM): premenopausal women, cystic lung disease, chylothorax, renal angiomyolipomas, recurrent PTX — associated with tuberous sclerosis

Catamenial PTX: right-sided 90%, within 72h of menses, thoracic endometriosis

HIV + PTX = PCP until proven otherwise

Tracheal deviation toward side = atelectasis/fibrosis; away from side = tension PTX/large effusion

Hyperresonance + absent breath sounds + decreased fremitus = PTX

Dullness + absent breath sounds + decreased fremitus = effusion/hemothorax

Deep sulcus sign on supine CXR = PTX in trauma

Lung point on ultrasound = pathognomonic for PTX

Hamman's crunch = pneumomediastinum

Beck's triad (tamponade) vs tension PTX — both cause obstructive shock with JVD

Air resorption rate: ~1.25% per day on room air; ~4× faster on supplemental O₂

Recurrence rate PSP: ~30% at 1 year without surgery; <5% post-VATS

VATS indications mnemonic — "BRAVO 2nd":

Re-expansion pulmonary edema: chronic collapse + rapid drainage = ipsilateral edema within hours

Avoid bulla puncture: get CT if uncertain, especially in COPD

Smoking cessation reduces recurrence 4× — single most important long-term intervention

Chest tube triangle of safety: pectoralis major (anterior), latissimus dorsi (posterior), 5th ICS (inferior), apex at axilla

Needle decompression site (updated ATLS): 4th–5th ICS anterior axillary line (better than 2nd ICS MCL in many adults)

Board pearl: "Sudden pleuritic chest pain in a tall, thin male smoker at rest" — pattern recognition wins the question

Board Question Stem Patterns

— "22-year-old tall thin male smoker develops sudden right-sided pleuritic chest pain and dyspnea while watching TV. Exam: decreased breath sounds and hyperresonance on right. Vitals stable. CXR shows 3 cm rim of air at apex."

— Answer: Needle aspiration or small-bore chest tube + O₂ + admit/observe; counsel smoking cessation, no air travel, no diving

— "Trauma patient with multiple rib fractures becomes hypotensive (BP 80/40), tachycardic, with JVD and absent breath sounds on left. SpO₂ 82%."

— Answer: Immediate needle decompression, then chest tube — NOT chest X-ray first

— "68-year-old with severe COPD presents with sudden dyspnea. SpO₂ 84% on 4L. CXR shows 1.5 cm PTX on right."

— Answer: Admit, chest tube (even though small), thoracic surgery consult; do not aspirate or observe — SSP is different

— "Following subclavian central line, patient develops dyspnea. CXR shows moderate PTX."

— Answer: Small-bore chest tube if symptomatic/large; observation + O₂ if small and asymptomatic; ensure ultrasound guidance documented for future

— "30-year-old woman with 3rd right-sided PTX, each occurring within 2 days of menses."

— Answer: VATS pleurodesis + hormonal suppression (GnRH agonist or OCP); evaluate for thoracic endometriosis

— "Mechanically ventilated ARDS patient develops sudden hypotension, rising peak airway pressures, decreased breath sounds on left."

— Answer: Needle decompression immediately, then chest tube

— "First PTX 6 months ago, now presents with 2nd ipsilateral PTX."

— Answer: Chest tube + thoracic surgery for VATS pleurodesis

— "Commercial pilot after first PSP asks when he can fly."

— Answer: After resolution and consideration of definitive surgical pleurodesis for return to flight duty; lifelong diving ban without surgery

— "HIV patient with CD4 80, dyspnea, bilateral infiltrates, and left PTX."

— Answer: TMP-SMX + steroids for PCP + chest tube

— "After chest tube placement for large chronic PTX, patient develops ipsilateral pulmonary edema."

— Answer: Supportive care, supplemental O₂, diuretics; lesson learned: drain to water seal slowly, no suction initially

Stem 1 — Classic PSP:

Stem 2 — Tension PTX:

Stem 3 — SSP in COPD:

Stem 4 — Iatrogenic post-procedure:

Stem 5 — Catamenial PTX:

Stem 6 — Ventilator barotrauma:

Stem 7 — Recurrence:

Stem 8 — Pilot/diver counseling:

Stem 9 — HIV with PTX:

Stem 10 — Re-expansion edema:

Board pearl: Match the etiology to the algorithm — primary vs secondary changes everything

One-Line Recap

Pneumothorax management hinges on three questions — Is the patient stable? Is the lung disease primary or secondary? And is the PTX small or large? — with tension physiology being a clinical diagnosis requiring immediate needle decompression and tube thoracostomy without waiting for imaging.

Triage: Tension PTX = decompress immediately (4th–5th ICS AAL or 2nd ICS MCL) → tube thoracostomy → CXR; never delay for imaging in an unstable patient with classic findings

Primary spontaneous PTX: stable small/asymptomatic = observation + O₂ + outpatient follow-up; large/symptomatic = aspiration or small-bore pigtail; recurrence ~30% → VATS bleb resection + pleurodesis for 2nd ipsilateral, 1st contralateral, bilateral, persistent air leak, or high-risk occupation (pilot, diver)

Secondary spontaneous PTX: always admit, always chest tube even if small, early thoracic surgery consult; mortality 10–15% reflects limited reserve in underlying COPD/CF/HIV-PCP/cancer

Universal discharge bundle: smoking cessation pharmacotherapy + counseling, no air travel until resolution + 1–2 weeks, lifetime scuba diving ban unless surgically pleurodesed, scheduled CXR at 2 and 6 weeks, written return precautions, pulmonology/thoracic referral when indicated, vaccinations updated

Step 3 management: Document all four counseling pillars at discharge — smoking cessation, air travel restriction, diving avoidance, return precautions — because transition-of-care omissions are the most commonly tested liability point for this diagnosis on Step 3 CCS and MCQ stems alike