Pulmonary · Topic 20 of 28

Hemoptysis

Pulmonary · airway bleeding

Hemoptysis

Massive hemoptysis kills by asphyxiation: put the bleeding lung down, secure a large airway, then stop the bleeding with bronchial artery embolization.

Key numbers

Massive: over 500 mL in 24 hours> 500 mL/24 h

Intubate with an 8.0 mm or larger tubeETT ≥ 8.0 mm

01 · What it isMassive: over 500 mL in 24 hours

No consensus definition exists: bleeding > 100 mL/h or > 500 mL in 24 hours is generally life-threatening (massive), as is any volume causing airway compromise, gas-exchange failure or hemodynamic instability.

02 · DoPosition bleeding lung down

Once the bleeding side is known, place the patient lateral decubitus with the bleeding lung dependent (bleeding side down) so blood does not spill into the good lung.

03 · DoBronchial artery embolization stops bleeding

Bronchial artery embolization is the preferred way to stop massive hemoptysis: the high-pressure bronchial arteries are the source in about 90%, and immediate success is 70–99%.

Causes & risk factors

Why it happens

Massive bleeding: cancer, bronchiectasis, TBAdult hemoptysis mostly comes from bronchitis, bronchiectasis, TB, necrotizing pneumonia or lung abscess; massive hemoptysis is most often bronchogenic carcinoma, bronchiectasis, TB or other pneumonias.

Do right now

In this order

First moves

Position bleeding lung down

→

Intubate with an 8.0 mm or larger tubeETT ≥ 8.0 mm

→

Reverse anticoagulants and correct coagulopathy

→

CT angiography localizes site and cause

→

Bronchial artery embolization stops bleeding

Why each step

Position bleeding lung downOnce the bleeding side is known, place the patient lateral decubitus with the bleeding lung dependent (bleeding side down) so blood does not spill into the good lung.

Intubate with an 8.0 mm or larger tubeIntubate with a single-lumen tube 8.0 mm or larger so therapeutic bronchoscopy can pass; if needed, advance it into the mainstem bronchus of the non-bleeding lung to isolate it.

Reverse anticoagulants and correct coagulopathyCorrect any bleeding diathesis: reverse anticoagulants, give plasma, factor products or platelets as needed, and desmopressin for uremic platelet dysfunction; type and crossmatch early.

CT angiography localizes site and causeIn a stable patient, contrast CT or CT angiography best localizes the side, site and cause and maps vessels for embolization; bronchoscopy is preferred when airway control is needed or disease is bilateral.

Bronchial artery embolization stops bleedingBronchial artery embolization is the preferred way to stop massive hemoptysis: the high-pressure bronchial arteries are the source in about 90%, and immediate success is 70–99%.

Management

Orders

Asphyxiation, not blood loss, is the killer must knowAsphyxiation from blood flooding the airways, not exsanguination, is the usual cause of death — the first goals are protecting the non-bleeding lung and then stopping the bleeding.

Tranexamic acid, IV or nebulized, as a bridgeTranexamic acid, IV or nebulized, reduces bleeding in non-massive hemoptysis and can temporize massive bleeding before definitive intervention.

Rigid bronchoscopy for massive bleedingRigid bronchoscopy is preferred over flexible for massive bleeding — better suction and airway control; bronchial blockers, cold saline, topical epinephrine or laser give local hemostasis.

Surgery when embolization failsEmergency surgical resection is the last resort: for failed embolization or bronchoscopic control, recurrence despite repeated embolization, or bleeding too unstable for intervention.

Hematuria too: test for pulmonary-renal syndromeHemoptysis with hematuria or kidney failure suggests a pulmonary-renal syndrome (anti-GBM disease, granulomatosis with polyangiitis): order urinalysis, ANCA, anti-GBM and lupus serologies.

Red flags & don'ts

Avoid harm

Recent trach bleeding: think tracheoinnominate fistula complicationBleeding 3 days to 6 weeks after tracheostomy, often after a sentinel bleed, suggests a tracheoinnominate artery fistula: overinflate the cuff, then apply digital compression through the stoma while arranging emergency surgery.

Hemoptysis or hematemesis?

Commonly confused

Blood	Bright red, frothy
Comes with	Cough; choking sensation if massive
Localize with	Chest CT angiography, bronchoscopy

More detail

Reference

Show 6 reference facts

The most serious complication of bronchial artery embolization is spinal artery embolization with paraparesis or paraplegia (0.6–4.4%), now less common with superselective microcatheters.

Bleeding recurs after embolization in roughly 10–58%, especially with aspergilloma, TB, sarcoidosis or cystic fibrosis; repeat embolization works, and aspergilloma should be evaluated for elective resection.

A double-lumen endotracheal tube isolates the bleeding lung but is not routine: it is hard to place emergently and its narrow lumens clog with blood and clot.

Hemoptysis from heart failure or mitral stenosis usually responds to treating the heart failure; rarely, life-threatening bleeding from mitral stenosis needs emergency valvotomy.

Up to 50% of hemoptysis remains idiopathic (cryptogenic) after evaluation; prognosis is generally good, with bleeding usually resolving within 6 months.

Bronchial arteries carry under 5% of lung blood flow but at systemic pressure and usually arise from the descending aorta at T5–T6; chronic inflammation makes them dilated and tortuous.

Pearl

Patients drown before they bleed out — protect the good lung first.

Sources · Merck Manual Professional — Hemoptysis (Dezube R, rev. Nov 2025) · Kathuria H, Hollingsworth HM, Vilvendhan R, Reardon C. Management of life-threatening hemoptysis. J Intensive Care 2020;8:23 (PMC7132983) · Charya AV, Holden VK, Pickering EM. Management of life-threatening hemoptysis in the ICU. J Thorac Dis 2021;13:5139–5158 (PMC8411133) · Tarver EM et al. Tracheoinnominate Artery Fistula (simulation case). J Educ Teach Emerg Med 2021;6:S62–S86 (PMC10332689) · Starter sheet built from the verified AGACNP fact map (facts reviewed 2026-10-15).