Study objective: To discover the frequency of agonal respirations in cardiac arrest calls, the ways callers describe them, and discharge rates associated with agonal respirations.
Design: We reviewed taped recordings of calls reporting cardiac arrests and emergency medical technician and paramedic incident reports for 1991. Arrests after arrival of emergency medical services were excluded.
Setting: King County, Washington, excluding the city of Seattle.
Participants: Four hundred forty-five persons with out-of-hospital cardiac arrests receiving emergency medical services.
Interventions: Telephone CPR, emergency medical techniciansdefibrillation, and advanced life support by paramedics.
Measurements and main results: Any attempts at breathing described by callers were identified, as well as whether agonal respirations could be heard by dispatcher, emergency medical technicians, or paramedics. Agonal respirations occurred in 40% of 445 out-of-hospital cardiac arrests. Callers described agonal breathing in a variety of ways. Agonal respirations were present in 46% of arrests caused by cardiac etiology compared with 32% in other etiologies (P< .01). Fifty-five percent of witnessed arrests had agonal activity compared with 16% of unwitnessed arrests (P< .001). Agonal respirations occurred in 56% of arrests with a rhythm of ventricular fibrillation compared with 34% of cases with a nonventricular fibrillation rhythm (P< .001 ). Twenty-seven percent of patients with agonal respirations were discharged alive compared with 9% without them (P< .001).
Conclusion: There is a high incidence of agonal activity associated with out-of-hospital cardiac arrest. Presence of agonal respirations is associated with increased survival. These findings have implications for public CPR training programs and emergency dispatcher telephone CPR programs.