Synchronization of repetitive therapeutic interventions

An external defibrillator system for assisting manual delivery of chest compressions and ventilations to a patient by a rescuer as cardiopulmonary resuscitation (CPR), the external defibrillator system comprising:

• at least one speaker;
• at least one chest compression sensor configured to detect motion during the delivery of chest compressions to the patient;
• and
• a processor, memory, and associated circuitry coupled to the at least one speaker and the at least one chest compression sensor, the processor configured to:
• initiate prompting for the chest compressions and the ventilations manually delivered to the patient by the rescuer as CPR,
• receive and process signals from the at least one chest compression sensor,
• control the at least one speaker to generate first non-verbal auditory cues for the delivery of chest compressions to the patient by the rescuer, and
• control the at least one speaker to generate second non-verbal auditory cues comprising a gradually changing sound for the delivery of ventilations to the patient by the rescuer with a different sound than the first non-verbal auditory cues for the delivery of chest compressions,
• wherein the first non-verbal auditory cues for the delivery of chest compressions are of substantially shorter duration than the second non-verbal auditory cues for the delivery of ventilations, and wherein the first non-verbal auditory cues and the second non-verbal auditory cues assist the rescuer in timing the delivery of the chest compressions and the ventilations.