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THORACIC EMERGENCIESIN THE ONCOLOGY PATIENT
Richard M. Gore, MDNorth Shore University Health System
University of ChicagoEvanston, IL
SCBT/MR 2012Boston, Massachussetts
October 8, 201210:22-10:34
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TOPICS
• SVC SYNDROME• PULMONARY EMBOLISM• CARDIAC TAMPONADE• MALIGNANT TENSION HYDROTHORAX
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SUPERIOR VENA CAVA SYNDOME
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SVC SYNDROME:DEFINITION
• Symptom complex caused by obstruction of blood flow in the SVC limiting return of blood from the head, neck, and upper trunk to the right heart
• Results in symptoms of face, neck, chest wall and arm swelling, prominence of neck veins and plethora
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SVC OBSTRUCTION:CLASSIFICATION
• LUMEN OBSTRUCTION: bland or malignant thrombus with pacemaker leads or catheter related thrombosis
• EXTRINSIC COMPRESSION: CA, fibrosingmediastinitis, aneurysm, goiter
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SUPERIOR VENA CAVA SYNDOME:
• Pre or supra-azygos
• Post or infra-azygos
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SUPERIOR VENA CAVA SYNDOME:
• Pre or supra-azygos
• Post or infra-azygos
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SUPERIOR VENA CAVA SYNDOME:
• Pre or supra-azygos
• Post or infra-azygos
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COLLATERAL CIRCULATION BETWEEN SVC AND IVC
• Internal mammary veins• Vertebral veins• Azygos route• Lateral thoracic veins
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SVC OBSTRUCTION:CLINICAL FEATURES
• Engorged veins of neck and upper chest wall-multiple collaterals in chest and upper abdomen
• Laryngeal edema, cyanosis, papilledema, MS changes, stupor, coma, LAD
• Bending forward worsens the venous engorgement
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SVC OBSTRUCTION:ETIOLOGY
• Small cell lung cancer• Squamous cell lung cancer• Lymphoma• Metastases from breast CA, melanoma
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SVC OBSTRUCTION:ETIOLOGY
• Indwelling catheters • Pacemaker wires• Mediastinitis: TB, histoplasmosis• Thoracic aortic aneurysm
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MALIGNANT SVC OBSTRUCTION:TREATMENT
• STEROIDS• RADIATION THERAPY (lung cancer,
lymphoma, germ cell tumors)• CHEMOTHERAPY• STENTING• SURGERY – BYPASS GRAFTING
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BENIGN SVC OBSTRUCTION:TREATMENT
• ANTICOAGULATION-THROMBOLYSIS• CATHETER REMOVAL, LEAD
EXPLANTATION• STENTING• TREATMENT OF INFECTIOUS ETIOLOGY• SURGERY – BYPASS GRAFTING
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SVC OBSTRUCTION:PROGNOSIS
• Poor prognosis for malignant conditions• NSCLC resistant to CXRT < 6 mo survival• Benign etiology, stents or surgery have a
90% patency rate; need anti-coagulation
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SVC OBSTRUCTION:DIAGNOSTIC YIELD FOR CA
• Bronchoscopy: 50-70%• TTNB:75%• Mediastinoscopy or mediastinotomy: >90%
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TOPICS
• SVC SYNDROME• PULMONARY EMBOLISM• CARDIAC TAMPONADE• MALIGNANT TENSION HYDROTHORAX
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INCIDENTAL PULMONARY EMBOLISM
• 1.8% overall• 3.3% progressive cancer• 2.5% stable cancer• 0.7% NED• 1.0% non-oncology patients
Hui GC JCAT 32: 783-787, 2008
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INCIDENTAL PULMONARY EMBOLISM IN INPATIENTS
• PE in 5.7%• 9.2% > 70 years• 16.7% > 80 years• Most are peripheral >30% missed initially
Ritchie Thorax 62: 470-472, 2007
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INCIDENTAL PULMONARY EMBOLI ON NON PE MDCT
• 4.0% inpatient prevalance• 0.9% outpatient prevalance• 70.0% with unusupected emboli had cancer• Wide window settings allow for better
embolus detection
Shetty AJR 184: 264-2167, 2005
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INCIDENTAL PULMONARY EMBOLISM
• PE in 3.4%• 4% in inpatients• 0.9% in outpatients
Storto AJR 62: 464-467, 2005
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TOPICS
• SVC SYNDROME• PULMONARY EMBOLISM• PERICARDIAL EFFUSION-TAMPONADE• MALIGNANT TENSION HYDROTHORAX
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CARDIAC TAMPONADE
• Accumulation of pericardial fluid, blood, tumor, or air that increases intrapericardialpressure, restricts cardiac filling, and decreases cardiac output.
• Cardiac emergency that can be fatal.
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CARDIAC TAMPONADE:ACUTE
• Rapid onset seen in cardiac/great vessel trauma or s/p invasive procedure
• Beck triad: hypotension, jugular venous distention, and distant heart sounds
• Effusion may be small, given the relative inelasticity of the pericardium
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CARDIAC TAMPONADE:SUBACUTE
• More gradual process of fluid accumulation• Allows for stretching of pericardium and
much larger effusions than seen acutely• The most common type of tamponade, seen
in malignancy, TB, uremia• S+S more subtle, some or all of Beck triad
may be absent
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CARDIAC TAMPONADE:EFFUSIVE CONSTRICTIVE PERICARDITIS
• Related to scarred pericardium and most often occurs in patients with malignancy or prior radiation exposure
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CARDIAC TAMPONADE:ETIOLOGY
• CA the most common cause of tamponade• Lung and breast cancer most common CAs• 0-20 HU: simple serous effusion- CHF,
renal failure, or non-hemorrhagic CA • > 20 HU hemopericardium, CA, purulent
exudates, or myxedematous effusion
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CARDIAC TAMPONADE:DIAGNOSTIC CRITERIA
• Beck’s triad: hypotension, elevated jugular venous pressure, distant heart sounds
• Echo: RA systolic collapse, RV diastolic collapse, reciprocal respiratory ventricular inflow, IVC plethora
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CARDIAC TAMPONADE:ECHO FINDINGS
• Inversion free wall RA > ⅓ systole• RV diastolic collapse• Pulsus paradoxus• CXR: pericardium can hold > 200cc of fluid
before an enlarged silhouette is noted
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CARDIAC TAMPONADE:CT FINDINGS
• Enlarged SVC ≥ adjacent thoracic aorta
• Enlarged IVC > 2X adjacent aorta• Contrast reflux into IVC, azygos vein• Enlarged hepatic and renal veins
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CARDIAC TAMPONADE:MR FINDINGS
• Hemorrhagic and proteinaceous or exudative effusions generally exhibit high signal intensity on T1W and T2W images owing to the high protein content. Hemorrhage in the pericardial space usually exhibits low signal intensity on gradient-echo images; however, its appearance changes with time due to the degradation of blood products.
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CARDIAC TAMPONADE:MR FINDINGS
• Simple transudative effusions exhibit low signal intensity on T1W and high signal intensity on T2W images. The presence of septations and debris suggests a complex effusion.
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CARDIAC TAMPONADE:MR FINDINGS
• Can see as little as 30 cc fluid• Limited role due to emergent nature• Swinging heart and paradoxical septal
bounce on short-or long-axis cine MR images
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CARDIAC TAMPONADE:MR FINDINGS
• Can see as little as 30 cc fluid• Limited role due to emergent nature• Swinging heart and paradoxical septal
bounce on short-or long-axis cine MR images
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CARDIAC TAMPONADE:PROGNOSIS
• Patients with underlying malignancy have highest mortality
• In penetrating chest trauma patients, tamponade associated with better oucomesbecause tamponade acts as a stabilizing force
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TOPICS
• SVC SYNDROME• PULMONARY EMBOLISM• CARDIAC TAMPONADE• MALIGNANT TENSION HYDROTHORAX
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MALIGNANT TENSION HYDROTHORAX
• Pleural effusions develop in 50-70% of all cancer patients
• Tension hydrothorax: unusual complication• Marked mediastinal shift and compression
of lung causes severe hypoventilation and respiratory acidosis
• Pressure on heart and great vessels inhibits central venous return causes decreased cardiac output, metabolic acidosis, and circulatory collapse
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CARDIAC TAMPONADE:CT FINDINGS
• <0 HU: chylopericardium- CA, infection
• 0-20 HU: simple serous effusion- CHF, renal failure, or non-hemorrhagic CA
• > 20 HU hemopericardium, CA, purulent exudates, or myxedematouseffusion
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TOPICS
• SVC SYNDROME• PULMONARY EMBOLISM• CARDIAC TAMPONADE• MALIGNANT TENSION HYDROTHORAX