Perthes syndrome. or traumatic asphyxia. is a clinical syndrome associating cervicofacial cyanosis with cutaneous petechial haemorrhages and subconjonctival bleeding resulting from severe sudden compressive chest trauma. Deep inspiration and a Valsalva maneuver just prior to rapid and severe chest compression. https://www.roneverhart.com/Lorex-Outdoor-Round-Junction-Box-for-3-Screw-Base-Cameras-White/