<unk>  is the cessation of the normal tidal flow of the lungs due to paralysis of the diaphragm, collapse of the lung or any number of<unk>  failures.  It is a medical emergency and it usually is related to or coincides with a cardiac<unk> .  If<unk>  is prolonged, cardiac<unk>  quickly follows because progressive hypoxemia impairs cardiac function. Impending<unk>  is characterized by a depressed sensorium and feeble, gasping, or irregular respirations, often with accompanying tachycardia, diaphoresis, and relative hypertension due to agitation and CO2 accumulation.
Respiratory arrest
Cardiac arrest
Sleep paralysis
Syncope
Presyncope
Spinal shock
Intracranial hypotension
Bradypnea