In general, medivac helicopters should be utilized when:A. ground transport would leave your service area without an ambulance for greater than 30 minutes. B. ground transport to the hospital exceeds 30 to 45 minutes, even if the patient's present condition is stable. C. a patient has been in cardiac arrest for more than 15 minutes and has not responded to CPR and defibrillation. D. a patient has a time-dependent injury or illness and traffic conditions would cause a significant delay in definitive care.

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