100 bpm

HAH: > 150 bpm

Non-cardiac

Cardiogenic

Narrow Complex with Re-Entry SVT

DDx Heart Rate Rhythm ECG Finding
100-175 ir ir No distinguishable P waves (check v1)
130-170 can be regular/irrgular No P wave (Sawtooth only seen if <130)
140-200 very reg P wave after QRT: pseudo-s in II, III, aVF; pseudo-r in v1, v2
150-220 very reg P wave after QRT

Wide Complex Tachy

DDx Heart Rate ECG Finding
150-160 bpm
SVT + Bundle Brunch Blockage
(occationally high) Regular PR with dropped beat