11.5 Cardiopulmonary & Airway Emergencies
Key Takeaways
- Cardiac tamponade is a clinical diagnosis supported by Beck's triad and pulsus paradoxus greater than 10 mmHg, confirmed by echocardiography showing right atrial systolic and right ventricular diastolic collapse, and treated with urgent pericardiocentesis.
- Diuretics and vasodilators are harmful in tamponade because the obstructed ventricle depends on preload; volume support and urgent drainage are the correct actions.
- Massive hemoptysis is managed by positioning the patient with the bleeding lung dependent to protect the unaffected lung, securing the airway, and arranging urgent bronchoscopy or bronchial artery embolization.
- Carotid blowout syndrome in a head and neck cancer patient with prior radiation or flap necrosis requires direct pressure, large-bore access, blood products, and emergent interventional radiology embolization or stenting.
- No more than approximately 1.5 liters should be removed at a single thoracentesis, and drainage should stop earlier if chest tightness or cough develops, to avoid re-expansion pulmonary edema.
11.5 Cardiopulmonary & Airway Emergencies
Blueprint focus: ONCC Domain III.A, III.B, and III.C applied to the cardiothoracic emergencies. Every item below is tested the same way: recognize the syndrome, name the confirmatory test, and choose the immediate intervention.
1. Malignant Pericardial Effusion and Cardiac Tamponade
Etiology. Tumor invasion of the pericardium or obstruction of pericardial lymphatic drainage. Lung and breast carcinoma, melanoma, lymphoma, and leukemia account for most cases. Radiation to a mediastinal field can also produce effusion or constriction years later.
Pathophysiology. Fluid accumulating faster than the pericardium can stretch raises intrapericardial pressure above right-sided diastolic filling pressures. Chambers collapse in diastole, stroke volume falls, and cardiac output collapses. Rate of accumulation matters more than volume — 200 mL accumulating over hours can cause tamponade while 1,000 mL accumulating over months may not.
Presentation.
- Beck's triad: hypotension, elevated jugular venous pressure, and muffled or distant heart sounds.
- Pulsus paradoxus greater than 10 mmHg — an exaggerated inspiratory fall in systolic pressure.
- Dyspnea worse when supine, tachycardia, tachypnea, narrowed pulse pressure, hepatomegaly, and cool extremities.
- ECG: low QRS voltage and electrical alternans, the beat-to-beat variation in QRS amplitude produced by the heart swinging in fluid.
- Chest radiograph: enlarged globular "water-bottle" cardiac silhouette.
Confirmation. Transthoracic echocardiography is the test of choice, showing effusion, right atrial collapse in systole, right ventricular collapse in early diastole, and respiratory variation across the mitral and tricuspid inflow.
Immediate management.
- Urgent echocardiography-guided pericardiocentesis with placement of an indwelling drain.
- Give volume — cautious normal saline supports preload in a preload-dependent state.
- Avoid diuretics and vasodilators. This is the most commonly tested error: reducing preload in a patient whose obstructed ventricle depends on preload can precipitate cardiac arrest.
- Avoid positive-pressure ventilation where possible before drainage; it further impedes venous return.
- Definitive control for recurrent or loculated effusion: pericardial window or a sclerosing agent instilled into the pericardial space.
2. Malignant Airway Obstruction
Etiology. Endobronchial or tracheal tumor, extrinsic compression by mediastinal mass or adenopathy, or a mucus plug or clot in an already narrowed airway. Lung, esophageal, thyroid, and metastatic disease are typical causes.
Presentation. Progressive dyspnea, stridor (inspiratory with extrathoracic obstruction, expiratory with intrathoracic), wheeze localized to one side, cough, hemoptysis, post-obstructive pneumonia, and inability to lie flat. Stridor at rest signals critical narrowing.
Immediate management.
- Position upright, supply oxygen, and keep the patient calm — agitation increases turbulent flow and worsens obstruction.
- Heliox (helium-oxygen mixture) reduces turbulence and can buy time.
- Corticosteroids (dexamethasone) reduce peritumoral edema.
- Call interventional pulmonology or thoracic surgery immediately for rigid bronchoscopy with debulking, laser, cryotherapy, or airway stent placement.
- Definitive therapy: external beam radiation, endobronchial brachytherapy, or systemic therapy for chemosensitive tumors.
- Anterior mediastinal mass caution: these patients can lose their airway completely on induction of anesthesia or when placed supine. Avoid sedation, keep them upright, and involve anesthesia before any procedure.
3. Massive Hemoptysis
Definition. Expectoration of a volume large enough to threaten the airway — commonly defined as more than 100 to 600 mL in 24 hours, but any amount causing hypoxemia is treated as massive. Patients die of asphyxiation, not exsanguination.
Etiology. Cavitating squamous cell lung carcinoma, endobronchial tumor invading a bronchial artery, radiation necrosis, aspergilloma in a cavity, and anti-angiogenic therapy — bevacizumab is contraindicated in squamous NSCLC and in patients with cavitary lesions or prior significant hemoptysis for this reason.
Immediate management, in order.
- Position the patient with the bleeding side down to protect the unaffected lung from soiling. This is the single most tested nursing action in this syndrome.
- Secure the airway — suction, high-flow oxygen, and early intubation with a large-bore endotracheal tube if bleeding continues.
- Large-bore intravenous access, type and cross, correct coagulopathy, and transfuse platelets if thrombocytopenic.
- Urgent bronchoscopy for localization and local control, and bronchial artery embolization by interventional radiology as definitive control.
- Consider radiation for tumor-related bleeding once acutely stabilized.
- If bleeding is terminal and irreversible, transition to comfort-focused care with dark towels to reduce visual distress, and rapid-acting sedation such as intravenous or subcutaneous midazolam for the patient and support for the family.
4. Malignant Pleural Effusion
Presentation. Progressive dyspnea, dullness to percussion, absent breath sounds, decreased fremitus, and tracheal deviation away from the effusion when very large.
Diagnosis. Chest radiograph or ultrasound; thoracentesis with cytology (a single specimen is diagnostic in roughly 60% of cases, and yield rises with repeat sampling); exudative by Light's criteria.
Management.
- Therapeutic thoracentesis for symptom relief. Remove no more than approximately 1.5 liters at one session, and stop earlier if the patient develops chest tightness or cough, to avoid re-expansion pulmonary edema.
- For recurrent effusion: indwelling tunneled pleural catheter (allows home drainage and often produces spontaneous pleurodesis) or chemical pleurodesis with talc.
- Pleurodesis fails when a trapped lung prevents pleural apposition; a tunneled catheter is preferred in that situation.
5. Carotid Blowout Syndrome
Setting. Head and neck cancer with prior radiation, radical neck dissection, flap necrosis, pharyngocutaneous fistula, or tumor invading the carotid.
Warning signs. A sentinel bleed from the mouth, nose, or wound; a pulsatile mass; exposed carotid in a wound bed. A sentinel bleed demands immediate vascular imaging — it precedes catastrophic rupture.
Immediate management. Direct pressure over the bleeding site, protect the airway, two large-bore intravenous lines, activate massive transfusion, and call interventional radiology emergently for embolization or covered stent placement. Where rupture is anticipated in a patient with terminal disease, an advance plan for comfort-focused management with immediate sedation should be documented in advance and dark towels kept at the bedside.
6. Pulmonary Embolism in the Patient With Cancer
Recognition. Sudden dyspnea, pleuritic chest pain, tachycardia, hypoxemia, hemoptysis, or syncope. Hypotension or right ventricular strain identifies massive or submassive PE.
Management. Anticoagulate as detailed in Section 10.5. Systemic thrombolysis is reserved for hemodynamically unstable massive PE, with catheter-directed therapy as an alternative when bleeding risk is high. Incidental PE found on staging imaging is treated the same as a symptomatic event.
The Common Thread
Every syndrome in this section is diagnosed clinically and confirmed by one specific test, and in each the immediate action differs from the definitive treatment. Tamponade needs volume and a needle, not a diuretic. Airway obstruction needs steroids, heliox, and a bronchoscopist, not more nebulizers. Massive hemoptysis needs the bleeding lung down and an airway, not a chest radiograph first. Knowing which lever to pull first is what the exam is testing.
A patient with metastatic breast cancer presents with hypotension of 84/62 mmHg, elevated jugular venous pressure, muffled heart sounds, and a 16 mmHg inspiratory fall in systolic pressure. Echocardiography confirms a large pericardial effusion with right ventricular diastolic collapse. Which order would be most harmful?
A patient with cavitating squamous cell lung carcinoma of the right upper lobe suddenly coughs up approximately 300 mL of bright red blood. He is awake with an oxygen saturation of 88%. What is the immediate priority action?
A patient with a large malignant pleural effusion is undergoing therapeutic thoracentesis. After 1.4 liters have been drained she develops chest tightness and a persistent cough. What should the nurse practitioner do?