^In infants HR cuttoff = 220
ECG findings
P-waves
Sinus tachycardia - may be seen before QRS complexes
SVT - either p-waves not seen OR retrograde p-waves
Signs with no actionable clinical relevance, unless they persist after conversion:
ST depressions in any lead
ST elevation in aVR
SVT is very rarely isolated manifestation of ACS and ST changes usually resolve after<unk>  is appropriately treated
Consider<unk>  underlying causes to include:
Drug toxicity
Caffeine
Stimulants
EtOH
Thyroid disease
Electrolyte abnormality
Hypoxia, pulmonary embolism
Pre-existing heart disease (prior MI, MVP, pericarditis) is rare
P-waves
Sinus tachycardia - may be seen before QRS complexes
SVT - either p-waves not seen OR retrograde p-waves
Signs with no actionable clinical relevance, unless they persist after conversion:
ST depressions in any lead
ST elevation in aVR
SVT is very rarely isolated manifestation of ACS and ST changes usually resolve after<unk>  is appropriately treated
Sinus tachycardia - may be seen before QRS complexes
SVT - either p-waves not seen OR retrograde p-waves
ST depressions in any lead
ST elevation in aVR
SVT is very rarely isolated manifestation of ACS and ST changes usually resolve after<unk>  is appropriately treated
Drug toxicity
Caffeine
Stimulants
EtOH
Thyroid disease
Electrolyte abnormality
Hypoxia, pulmonary embolism
Pre-existing heart disease (prior MI, MVP, pericarditis) is rare
Caffeine
Stimulants
Troponins are not indicated in patients without significant risk factors for CAD
Paroxysmal supraventricular tachycardia
Regular
Wandering atrial pacemaker
AV Node Independent
Wide-complex tachycardia
Sinus tachycardia
Nonsustained ventricular tachycardia
Atrial tachycardia 