PNEUMOMEDIASTINUM: A PATIENT PRESENTATION
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1 November 2002 PNEUMOMEDIASTINUM: A PATIENT PRESENTATION Alden Chip McDonald, III Harvard Medical School, Year III
2 AGENDA I. Patient Presentation II. Diagnosis of Pneumomediastinum III. Causes of Pneumomediastinum IV. Work-Up of Pneumomediastinum V. Patient Wrap-Up 2
3 PATIENT PRESENTATION 3
4 HISTORY Permission obtained. CM is a 19 year-old pre-med Harvard College male who presented to UHS complaining of sore throat when drinking liquids and pleuritic chest pain in the superior chest radiating to the neck. Symptoms began upon awakening this morning and patient reports having several bouts of intense emesis of unknown cause (likely viral gastroenteritis) yesterday evening. Patient denies any hematemesis and denies vomiting this AM. Source: Harvard University Health Services 4
5 PHYSICAL EXAM BP- 122/72, T General- Pt. talking clearly, in no apparent respiratory distress. HEENT- Tenderness in the area of the cricoid. Crepitance felt in the right supraclavicular area. Otherwise unremarkable. Chest- Clear to auscultation bilaterally. No stridor. Heart- Regular rate and rhythm. No murmurs. Source: Harvard University Health Services 5
6 CM S PA CHEST X-RAY Air in neck tissues Air outlining ascending aorta Source: Harvard University Health Services 6
7 CM S PA CHEST X-RAY (expiration) Source: Harvard University Health Services 7
8 DIAGNOSIS OF PNEUMOMEDIASTINUM 8
9 CLINICAL SIGNS & SYMPTOMS Subcutaneous emphysema- crepitation in neck Pleuritic chest pain Neck pain Dyspnea Dysphagia Hamman sign = mediastinal crunch Pneumothorax 9
10 RADIOGRAPHIC VIEWS PA Chest x-ray (inspiration and expiration) Lateral Chest x-ray Lateral decubitus Neck films 10
11 RADIOGRAPHIC SIGNS OF PNEUMOMEDIASTINUM PA Chest X-Ray Streaky radiolucencies in mediastinum (most commonly in left paracardiac area) Air outlining mediastinal structures Continuous diaphragm sign of Levin Lateral Chest X-Ray Retrosternal air Lateral Decubitus Chest X-Ray Air will not move with change in position Neck Films Air outlining fascial planes of the neck 11
12 CM S PA CHEST X-RAY (expiration) Streaky lucencies Air outlining ascending aorta Source: Harvard University Health Services 12
13 CM S LATERAL CHEST X-RAY Source: Harvard University Health Services 13
14 CM S NECK FILMS Contrast in hypopharynx Streaky lucencies Aberrant air Source: Harvard University Health Services 14
15 COMPANION PATIENT #1- PNEUMOMEDIASTINUM ON CT Air outside of trachea Source: BIDMC PACS 15
16 PNEUMOMEDIASTINUM VS. PNEUMOTHORAX OR PNEUMOPERICARDIUM Pneumomediastinum vs. Medial Pneumothorax Lateral decubitus positioning will reveal change in air distribution in pneumothorax, whereas mediastinal air will remain locked in position Clear delineation of intramediastinal structures in pneumomediastinum Pneumomediastinum vs. Pneumopericardium Lateral decubitus positioning will reveal change in air distribution in pneumopericardium, whereas mediastinal air will remain locked in position Pericardial reflections do not extend above ascending aorta Thickened pericardium in pneumopericardium can be differentiated from mediastinal pleura 16
17 CAUSES OF PNEUMOMEDIASTINUM 17
18 DIFFERENTIAL DIAGNOSIS OF PNEUMOMEDIASTINUM Where did the air come from? Air from outside Air from inside Air from gas-producing organisms 18
19 AIR FROM OUTSIDE Trauma Gunshot wound Stab wound Other penetrating trauma Iatrogenic Mediastinal surgery Mediastinoscopy Sternal bone marrow aspiration Thyroidectomy Tonsillectomy 19
20 AIR FROM INSIDE 4 Sources: 1) Pulmonary 2) Mediastinum 3) Head and Neck 4) Abdomen 20
21 AIR FROM INSIDE- PULMONARY Increased alveolar pressure Abnormally weak lung parenchyma Alveolar overdistention and rupture Air leak into pulmonary interstitium Air dissects to lung roots Air enters mediastinum 21
22 AIR FROM INSIDE- PULMONARY Increased alveolar pressure Ventilation assistance (e.g. PEEP) Airway obstruction (e.g. asthma) Vomiting (e.g. anorexia nervosa) Coughing Straining (e.g. Valsalva maneuver) Heimlich maneuver Blunt chest trauma Abnormally weak lung parenchyma Infection (especially viral or TB) Sarcoid Emphysema ARDS Metastases to the lung Needle biopsy of lung Atelectasis 22
23 AIR FROM INSIDE- PULMONARY Routes of Air (1) Air ruptures from alveolus into perivascularperibronchial fascial sheath (2) Fascial sheath ruptures (3) Rupture into the pleural space may occur Source: Cyrlak D, 1984 (4)Mediastinal air under tension may rupture mediastinal pleura 23
24 AIR FROM INSIDE- MEDIASTINUM Rupture of air-containing mediastinal structures (esophagus, trachea, bronchi) caused by: Trauma (blunt or penetrating) Iatrogenic disease (intubation, tracheotomy) Acute increased intraluminal pressure (vomiting, childbirth, coughing, defecation, weightlifting, seizures) Malignancy (fistula formation) Spontaneous (less common) 24
25 AIR FROM INSIDE- HEAD & NECK Perforation of the nasopharynx, larynx, and cervical portion of the esophagus and trachea caused by: Trauma (including facial fractures, especially those involving the sinuses) Iatrogenic disease (placement of nasogastric tube, endotracheal intubation, facial surgery, dental procedures, neck surgery) 25
26 AIR FROM INSIDE- ABDOMEN Air extending from abnormal collections of air in the abdomen, intra- or extraperitoneal air, caused by: Trauma Iatrogenic (perforation of the bowel during gastroscopy, colonoscopy, rectal or renal surgery) Bowel perforation (perforation of diverticula, gastric or duodenal ulcers) 26
27 AIR FROM GAS-PRODUCING ORGANISMS Acute infection of the mediastinum causing mediastinitis is rare. Retroperitoneal infections may introduce gas into the soft tissues, which spreads to mediastinum. 27
28 WORK-UP OF PNEUMOMEDIASTINUM 28
29 ASSESS FOR UNDERLYING ILLNESS Work-up is predicated on underlying illness that may have caused pneumomediastinum. Recall differential diagnosis: Air from outside Assess defects from trauma or iatrogenic sources Air from inside Pulmonary- Address causes of increased alveolar pressure or abnormally weak pulmonary parenchyma Mediastinum- Contrast medium swallow to rule-out esophageal perforation (water-soluble contrast agent); Endoscopy, bronchoscopy if indicated Head & Neck- Assess perforations from trauma/iatrogenic sources Abdomen- Evaluate source of abnormal air in the abdomen Air from gas-producing organisms 29 Assess and treat infection
30 ASSESS FOR POSSIBLE COMPLICATIONS/ PROGRESSION Serious Complications: Tension pneumothorax Tension pneumopericardium Mediastinitis Follow-up chest x-ray within hours to detect any progression or complications. May admit for observation. 30
31 PROGNOSIS Prognosis depends on underlying illness and complications. Generally good prognosis. Pneumomediastinum and symptoms usually resolve in 2-7 days. 31
32 PATIENT WRAP-UP 32
33 CM S GASTROGRAFFIN SWALLOW ONE DAY LATER No esophageal perforation Source: Harvard University Health Services 33
34 COMPANION PATIENT #2- ABNORMAL GASTROGRAFFIN/BARIUM SWALLOW Leakage of contrast Source: BIDMC PACS 34
35 CM S CHEST X-RAY ONE DAY LATER Pneumomediastinum still present, but not expanding Source: Harvard University Health Services 35
36 OUTCOME CM s symptoms resolved one day later, although a pneumomediastinum remained visible yet stable on the chest x-ray. CM was never admitted to the hospital but was told to return to the clinic if symptoms continued. CM has never had any problems since and is now in his third year of medical school. 36
37 SUMMARY I. Patient Presentation CM demonstrated clinical and radiographic signs and symptoms of pneumomediastinum II. Diagnosis of Pneumomediastinum - Clinical signs and symptoms including crepitance, pleuritic chest pain, neck pain, dyspnea - Radiographic signs on PA, lateral, lateral decubitus chest x-rays, neck films, CT III. Causes of Pneumomediastinum - Air from outside - Air from inside (pulmonary, mediastinal, head & neck, abdomen) - Air from gas-producing organisms IV. Work-Up of Pneumomediastinum - Assess underlying illness - Monitor for complications and progression 37
38 ACKNOWLEDGEMENTS Daniel Saurborn, MD Pamela Lepkowski Michael Larson Harvard University Health Services Larry Barbaras and Cara Lyn D amour 38
39 REFERENCES Buckner CB, Harmon BH, Pallin JS. The radiology of abnormal intrathoracic air. Current Problems in Diagnostic Radiology, 17(2): 37-71, Mar-Apr Cyrlak D, Milne EN, Imray TJ. Pneumomediastinum: A diagnostic problem. Critical Reviews in Diagnostic Imaging, 23(1): , Felson. Gamuts in Radiology. Holmes KD, McGuirt WF. Spontaneous Pneumomediastinum: Evaluation and Treatment. Journal of Family Practice, 31(4): 422-9, Oct Maunder RJ, Pierson DJ, Hudson LD. Subcutaneous and Mediastinal Emphysema. Archives of Internal Medicine, 144(7): , July Radiologic Clinics of North America Series. Smith BA, Ferguson DB. Disposition of spontaneous pneumomediastinum. American Journal of Emergency Medicine, 9(3): 256-9, May
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