Atrial tachycardiaA fast rhythm with rates commonly 150-240/minute; QRS complex is most often narrow; rhythm is usually generated from a re-entry loop – often making use of an accessory bundle and the AV node. 1. Six Second ECG Guidebook (2012), T Barill, p. 191 with a witnessed sudden onset; rhythmOften refers to a discernible pattern in time or distance between QRS complexes and/or P waves. is regular with a rateHeart Rate; calculated by counting the number of QRS complexes in six seconds and multiplying by 10; rate is also determined by measuring the number of large squares between two R waves; i.e. –1 large square = heart rate of 300/minute. of 150-240/minute.
1. Six Second ECG GuidebookA Practice Guide to Basic and 12 Lead ECG Interpretation, written by Tracy Barill, 2012 Introduction The ability to correctly interpret an electrocardiogram (ECG), be it a simple six second strip or a 12 lead ECG, is a vital skill... (2012), T Barill, p. 201