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

Table 1

The time variables with descriptive names, variable names, coding, and explanation of each variable.

	Variable; in Access database	Possible values	Description
ECG start time	ecghr	(0–23, 99); 99 = unknown	The hour of actual start time of the ECG
ECG start time	ecgmn	(0–59, 99); 99 = unknown	The minute of the actual start time of the ECG
ECG start time	ecgsc	(0–59, 99); 99 = unknown	The second of the actual start time of the ECG
First compression time	fchr	(0–23, 88, 99); 88 = no CPR administered,; 99 = unknown	Hour of first compression, prior to shock. Record only if first compression on record is actually the first compression given
First compression time	fcmn	(0–59, 88, 99); 88 = no CPR administered,; 99 = unknown	Minute of first compression, prior to shock. Record only if first compression on record is actually the first compression given
First compression time	fcsc	(0–59, 88, 99); 88 = no CPR administered,; 99 = unknown	Second of first compression, prior to shock. Record only if first compression on record is actually the first compression given
Last compression time	lchr	(0–23, 88, 99); 88 = no CPR administered,; 99 = unknown	Hour of last compression before shock
Last compression time	lcmn	(0–59, 88, 99); 88 = no CPR administered,; 99 = unknown	Minute of last compression before shock
Last compression time	lcsc	(0–59, 88, 99); 88 = no CPR administered,; 99 = unknown	Second of last compression before shock
Shock time	shkhr	(0–23, 99); 99 = unknown	Actual hour of shock delivery
Shock time	shkmn	(0–59, 99); 99 = unknown	Actual minute of shock delivery
Shock time	shksc	(0–59, 99); 99 = unknown	Actual second of shock delivery
VF onset time	vfonsethr	(0–23, 99); 99 = no onset, patient remained in VF; blank indicates no vf	Hour of VF onset, best estimate when underneath CPR artifact
VF onset time	vfonsetmm	(0–59, 99); 99 = no onset, patient remained in VF; blank indicates no vf	Minute of VF onset, best estimate when underneath CPR artifact
VF onset time	vfonsetss	(0–59, 99); 99 = no onset, patient remained in VF; blank indicates no vf	Second of VF onset, best estimate when underneath CPR artifact; Therefore a 99 : 99 : 99 indicates an unsuccessful defibrillation
ROSC time	rschr	(0–23, 99) 99 = unknown	Actual hour of ROSC
ROSC time	rscmn	(0–59, 99) 99 = unknown	Actual minute of ROSC
ROSC time	rscsc	(0–59, 99) 99 = unknown	Actual second of ROSC