Philips 861304 owner manual ECG analysis system, ECG analysis performance

37

ECG analysis system

Philips Medical Systems

category

function

shockable rhythms

non-shockable rhythms

pacemaker detection

artifact detection

analysis protocol

specifications

Evaluates impedance of adhesive pads for proper contact with patient skin, and evaluates the ECG rhythm and signal quality to determine if a shock is appropriate.

Ventricular fibrillation (VF) and some ventricular tachycardias, including ventricular flutter and polymorphic ventricular tachycardia (VT). The HeartStart FRx Defibrillator uses multiple parameters to determine if a rhythm is shockable.

NOTE: Some very low-amplitude or low-frequency rhythms may not be interpreted as shockable VF rhythms. Also, for safety reasons, some VT rhythms often associated with circulation may not be interpreted as shockable rhythms.

On detection of any non-shockable rhythm, prompts user to perform CPR if needed.

Pacemaker artifact is removed from the signal for rhythm analysis.

If electrical “noise” (artifact) is detected that interferes with accurate rhythm analysis, analysis will be delayed until the ECG signal is clean.

Depending on results of analysis, either prepares for shock delivery or provides a pause. For details of protocol, see Appendix F, “Configuration.”

APPENDICES

ECG analysis performance

	ECG test	meets AHA recommendationsb for adult defibrillation
		observed	90% one-sided
rhythm class	samplea size
		performance	lower
			confidence limit
shockable rhythm —	300	sensitivity >90%	(87%)
ventricular fibrillation
shockable rhythm —	100	sensitivity >75%	(67%)
ventricular tachycardia
non-shockable rhythm —	300	specificity >99%	(97%)
normal sinus rhythm
non-shockable rhythm —	100	specificity >95%	(92%)
asystole