Towards the Automated Analysis and Database Development of Defibrillator Data from Cardiac Arrest

Table 4

The primary information objects (PIO). These variables constitute the primary information objects (PIO) and are used to model the entire resuscitation episode. The therapy and response domains are described independently. For each domain the entire time span of the episode is described as a sequence of interchanging states. For each state change, the corresponding transition times are given which specify the times entering and leaving the state. The entering time of a state corresponds to the leaving time of the prior state unless it is the beginning of the episode. The leaving time of a state corresponds to the entering time for the next state unless it is the end of the episode.

Variable domain
Transition time	Patient’s response		Therapy
	State	Code	State	Code
Seconds	Ventricular fibrillation	VF	Chest compressions	C
Seconds	Ventricular tachycardia	VT	Hands off interval	H
Seconds	Asystole	AS	Defibrillation	D
Seconds	Pulseless electrical activity	PE	Unknown	U
Seconds	Pulse generating rhythm	PR
Seconds	Unknown	UN