Received 5 March 2011, Accepted 24 March 2011, Available online 23 June 2011. Spontaneous pneumomediastinum is defined as free air within the mediastinum, not associated with trauma. Causes include exercise, drugs, asthma, vomiting, difficult labour and Valsalva maneuvers. Itâs a rare, usually benign and self-limited condition, more prevalent in young males.
A youth bouncing on a trampoline. A trampoline is a device consisting of a piece of taut, strong fabric stretched over a steel frame using many coiled springs. People bounce on trampolines for recreational and competitive purposes.
This trampoline is a very nice piece. It also is easy to assemble IF you pay carful attention to where the Door to the enclosure lines up BEFORE you attach the springs. The encolsue was pre-attaced to the jumping surface (which is nice) however the instructions we not clear as to where the door should line up.