Pneumomediastinum and pneumoretroperitoneum

Pneumomediastinum and subcutaneous emphysema in a synchronized swimmer

Pneumomediastinum is a rare injury that has been documented in both recreational and competitive athletes. It has been reported in a variety of situations, but it is often a result of chest trauma. Repeated and prolonged use of Valsalva's maneuvers is also believed to lead to pneumomediastinum, as was the case with the synchronized swimmer presented here. The condition is self-limited and benign in healthy patients, and oxygen therapy may be helpful. Recommendations for athletes typically promote a gradual return to activity after 7 to 10 days.

Spontaneous subcutaneous temporal emphysema

The presence of air in the temporal regions is an uncommon presentation of spontaneous pneumomediastinum. As terminal alveoli rupture, air dissects along bronchovascular shafts. Usually, air travels either in a superior or inferior direction. Thus, extensive spontaneous subcutaneous emphysema accompanied by both cervical and retroperitoneal emphysema is rarely encountered. We present an unusual case of spontaneous pneumomediastinum, pneumoretroperitoneum, and cervical and facial emphysema presenting as bilateral painless temporal swelling. To our knowledge, this association has not been reported. Treatment involves observation for potentially life-threatening sequelae.

Retroperitoneoscopy versus laparoscopy in piglets: ventilatory and thermic repercussions

BACKGROUND/PURPOSE

Endoscopic surgery of the retroperitoneal space in children is developing. During preliminary clinical experience, the authors were surprised by the differences observed in comparison with laparoscopic pneumpoeritoneum (PNOP); retropneumpoeritoneum (RPNOP) seemed to have less ventilatory repercussions.

METHODS

The authors therefore undertook a study on animal models. Six suckling pigs, newly weaned, each weighing 10 kg successively underwent, at 8-day intervals and in random sequence, a right RPNOP with kidney and vena cava dissection, with insufflation of CO2 at 10 mm Hg of pressure and a PNOP with the same pressure of 10 mm Hg.

RESULTS

P(ET)CO2 increased during PNOP, and it remained stable during during RPNOP (P = .035). The ventilatory peak airway pressures (PawP) increased during PNOP, but were not modified during RPNOP (P = .0001). Temperature decreased with time (P = .0001) without difference between the two procedures (P = .34).

CONCLUSIONS

RPNOP was not associated with any adverse effects on the ventilation despite the insufflation pressure of 10 mm Hg, which allowed a satisfactory working area to be created. Operations by RPNOP could be developed in children with fewer respiratory repercussions than those observed during laparoscopy at an equivalent level of pressure.

Epidural pneumatosis associated with spontaneous pneumomediastinum: case report and review of the literature

Epidural pneumatosis rarely has been reported in association with spontaneous pneumomediastinum. We report a case of an asymptomatic 24-year-old male who presented after forceful vomiting with both findings. The patient recovered uneventfully without residual signs or symptoms. We discuss spontaneous pneumomediastinum as well as epidural pneumatosis and review reported cases in the literature.

Benign pneumoperitoneum associated with pneumomediastinum and pneumoretroperitoneum in ambulatory outpatients

Perforation of a hollow viscus and other dangerous etiologies must always be considered in the evaluation of free peritoneal air. Pneumoperitoneum in the presence of pneumoretroperitoneum and pneumomediastinum, however, often results from air tracking from a pathologic source outside of the abdomen along the mesentery into the peritoneum. This syndrome is relatively benign, and should be considered when there are multiple sites of extraluminal air in order to minimize the risk of unnecessary exploratory laparotomy. Two cases of benign pneumoperitoneum associated with pneumomediastinum and pneumoretroperitoneum are presented.

Pulmonary barotrauma as the cause of pneumoretropharynx in pulmonary lymphangioleiomyomatosis

A 55-year-old white woman with pulmonary lymphangioleiomyomatosis (LAM) presented to the emergency department with odynophagia and subplatysmal emphysema after a paroxysm of coughing. Lateral neck films showed subcutaneous emphysema and a retropharyngeal air stripe. Chest radiographs showed neither pneumothorax nor pneumomediastinum. Patients with LAM frequently develop pulmonary barotrauma and pneumothoracies. This patient, however, had undergone prior bilateral talc pleuradesis as treatment for recurrent pneumothoracies and, thus, could not manifest this complication of barotrauma. This case illustrates the uncommon occurrence of superior dissection of air after pulmonary barotrauma.