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J Thorac Cardiovasc Surg 2003;126:774-776
© 2003 The American Association for Thoracic Surgery

General thoracic surgery

Spontaneous pneumomediastinum: a rare benign entity

^a Department of Thoracic Surgery, General Hospital of Nikea, Piraeus, Greece

Received for publication July 1, 2002; revisions received August 19, 2002; revisions received September 11, 2002; accepted for publication October 10, 2002.

^* Address for reprints: Kalliopi Athanassiadi, MD, 34A Konstantinoupoleostr., 15562 Holargos, Athens, Greece
kallatha{at}otenet.gr

	Abstract

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OBJECTIVE: Spontaneous pneumomediastinum usually occurs in young people without an apparent precipitating factor or disease. Thoracic surgeons are involved in the diagnosis and management of this entity because of the potentially life-threatening conditions that either must be treated as an emergency or excluded, such as esophageal perforation or necrotizing mediastinitis. We present our modest experience in treating spontaneous pneumomediastinum.

MATERIALS: Between 1988 and 1998 we treated 22 cases of spontaneous pneumomediastinum in 18 male patients and 4 female patients, ranging in age between 12 and 32 years. All traumatic cases were excluded. Retrosternal chest pain was the main symptom the patients presented. In only 11 cases was subcutaneous emphysema present. Chest radiography was diagnostic in all our cases. Computed tomographic scan, when performed, confirmed the diagnosis. An esophagogram was essential to exclude an esophageal rupture. Last, a cardiologic examination especially focusing on pericarditis excluded cardiac disease.

RESULTS: Conservative treatment consisted of bed rest, oxygen therapy, and analgesics, which led to rapid resolution of the spontaneous pneumomediastinum. The mean hospital stay ranged between 3 and 10 days. In a follow-up of 3 to 12 years only 1 recurrence was observed.

CONCLUSION: Spontaneous pneumomediastinum is usually an undiagnosed benign entity that responds very well to conservative treatment. It should be considered in the differential diagnosis of chest pain, especially in healthy adolescents and young adults.

	Patients

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Between 1988 and 1998 we treated 22 cases of SPM in 18 male patients and 4 female patients, ranging in age between 12 and 32 years. All traumatic cases were excluded. Retrosternal chest pain was the main symptom the patients presented (Table 1). In only 11 cases was subcutaneous emphysema present (Table 2). Five of these patients also had rhinolalia due to the presence of cervical emphysema because of retropharyngeal dissection. Thirteen patients had dyspnea, although their blood gas analysis was normal (72 mm Hg < PCO₂ < 85 mm Hg, 34 mm Hg < PCO₂ < 41 mm Hg) and 6 had cough a few days before the acute onset.

Chest and cervical radiography were diagnostic in all our cases (Figure 1). Computed tomographic (CT) scan, when performed (n = 9), confirmed the diagnosis of SPM and revealed in 1 case a concomitant pneumopericardium (Figure 2). Underlying disease was found only in 1 patient, a 27-year-old male smoker, in whom the CT scan demonstrated multiple small bullae at the apex of both lungs. He was the only patient who had a recurrence 1 year later. In all our cases the initial investigation included an esophagogram with meglumine diatrizoate (Gastrographin) to exclude any esophageal perforation. Last, a cardiologic examination focusing on pericarditis excluded cardiac disease.

View larger version (131K): [in this window] [in a new window]   Figure 1. Chest radiograph showing mediastinal air with dissection to the neck (arrows).

View larger version (98K): [in this window] [in a new window]   Figure 2. Computed tomogram showing spontaneous pneumomediastinum and pneumopericardium.

	Results

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	Discussion

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SPM is a rare condition with an incidence of 1 per 7000 to 12,000 hospital admissions.^2,4 The incidence we found in our series was 2 cases per 1000 hospital admissions and 1 case per 3578 patients examined in our department in the same period. It also represented the 0.08% of all cases of pneumomediastinum treated in our hospital. The male:female ratio was 8:1in our small series, similar to that of spontaneous pneumothorax (6:1).

Hamman¹ first described SPM in 1939. His description of audible crepitation occurring with the heartbeat on chest auscultation is known as "Hamman’s sign," which was present in 9 of our cases.

According to Macklin and Macklin,⁵ pneumomediastinum results from the rupture of terminal alveoli into the lung interstitium and the dissection of air along the pulmonary vasculature toward the hilum, with eventual extravasation into the mediastinum. This theory could explain only the 2 cases in which our patients reported having a cough. In the international literature SPM is reported to be the result of asthma, inhalation of drugs,^6,7 labor,⁶ diabetic ketoacidosis,⁸ Hodgkin disease after irradiation,⁹ chemotherapy,¹⁰ coughing, or forceful straining during exercise^11,12 and other activities associated with the Valsava maneuver.⁶ With the exception of 1 patient with lung bullae formation, no underlying disease was found in our cases.

The presentation of SPM consists of acute onset of chest pain,^2,3,13,14 as it was in our series, too. Symptoms such as dyspnea, dysphagia, and odynophagia have been also reported in the literature.^13,15 Rhinolalia,^16,17 developing as a consequence of cervical subcutaneous emphysema, is usually underestimated although present in the majority of cases. The initial differential diagnosis is broad, including musculoskeletal, pleural, pulmonary, cardiac, and esophageal causes.¹⁵ The presence of SPM was confirmed roentgenographically in all our cases. Esophageal studies with contrast material are essential to demonstrate any esophageal disease. CT scan was performed only to exclude any underlying pulmonary disease, as occurred in 1 of our patients who had multiple small lung bullae.¹⁸

Once more serious lethal causes are ruled out and the diagnosis is established, no special treatment is required and the patient can be discharged within the next 24 hours. Careful observation, bed rest, oxygen therapy, and analgesics comprissed the treatment we offered to our patients. Recurrence and complications are unusual and resolution of the symptoms is the rule.^15,19 Among our patients, only 1 recurrence was observed during our follow-up period of 3 to 12 years, which seems to be the longest in the literature.^3,13 No restrictions need to be followed by the patients and avoidance of predisposing factors is unnecessary.

In conclusion we would like to stress the following:

1. SPM is an often missed, benign entity that responds very well to conservative treatment.
   
2. SPM should be considered in the differential diagnosis of chest pain, especially in healthy adolescents and young adults.
   

	References

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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Personal Folders Download to citation manager Author home page(s): Kalliopi Athanassiadi Permission Requests Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Gerazounis, M. Articles by Moustardas, M. Search for Related Content PubMed PubMed Citation Articles by Gerazounis, M. Articles by Moustardas, M. Related Collections Mediastinum