Pneumomediastinum (PnM) is an uncommon phenomenon, though it is one of the most common causes of chest pain in young adults. It may be particularly important among aviators, as it may result in in-flight incapacitation. Spontaneous PnM is a variant usually associated with the Valsalva maneuver, used during high-performance flight. This may increase the risk of PnM recurrence and raises concern ...

BACKGROUND Recent literature states that many necessary skills of CPR and first aid are forgotten shortly after certification. The purpose of this study was to determine the skill and knowledge decay in first aid in those who are paid to respond to emergency situations within a workplace. METHODS Using a choking victim scenario, the sequence and accuracy of events were observed and recorded i...

Overtaking is a maneuver that consists of passing another vehicle traveling on the same trajectory, but at slower speed. considered one most dangerous, delicate and complex maneuvers performed by vehicle, as it requires quick assessment distance speed to be overtaken, also estimation available space for maneuver. In particular, drivers have difficulty overtaking in presence vehicles coming othe...

A spin stabilized satellite reorientation maneuver in the inertial space is investigated. Spin axis pointing and nutation damping magnetic attitude control algorithms are utilized. Evolutionary equations for oscillations of a symmetrical near required position derived. The exact solution wobble amplitude obtained averaged motion. angles relative to direction analyzed. Optimal gain found maneuve...

in this research, the calculation method of aerodynamic loads on an airplane in all flight situations is presented. in order to find an calculation equation for aerodynamic loads on an airplane in all flight conditions, the f-5 aircraft is selected as a prototype is divided into one hundred small parts longitudinally. therefore, the numerical solutions are taken place in different conditions of...

BACKGROUND Medical students have difficulty performing and interpreting musculoskeletal physical examinations and interpreting the findings. Research has focused on students' knowledge deficits, but there are few direct assessments of students' ability to perform a hypothesis-driven physical examination (HDPE). We developed a novel musculoskeletal Objective Structured Clinical Exam (OSCE) focus...

We report an extremely rare example of a thoracocervicofacial subcutaneous emphysema after Heimlich maneuver case.

A 19-year-old Chinese man presented with tachyarrhythmia during a human centrifuge session while performing a Valsalva manoeuvre at near normal (+1.4 Gz) centripetal forces. It was likely that the hydrostatic effects of sustained centrifugal forces, the distortion of the heart's shape, as well as swings in the autonomic dominance pre- and post-Valsalva manoeuvre, contributed to the tachyarrhyth...