The atriaRight and left atria (1/3 volume and muscle mass of the ventricles) pump blood to the ventricles. Chambers and Layers of the Heart 1. Six Second ECG Guidebook (2012), T Barill, p. 190 and the ventriclesThe larger chambers of the heart (3 times the volume and muscle thickness than the atria), responsible for the pumping of blood to the lungs and the rest of the body. are firing independently of each other (i.e. complete heart blockAlso known as complete heart block, the supraventricular impulse is blocked at the junction or high in the bundle branches; as a result, the myocardium above the block depolarizes independently of the myocardium below the block; characteristics of this rhythm... and ventricular tachycardiaIs a cardiac rhythm characterized by rapidly occurring wide QRS complexes with absent or infrequent P waves evident; the absence of atrial kick, the lack of filling time, and the tendency for ventricular tachycardia to change to ventricular fibrillation makes...).
The presence of an entirely chaotic PR intervalThe time and interval measured from the beginning of the P wave to the beginning of the QRS; should be called the PQ interval; normal PR interval is 0.12-0.20 seconds. The PR interval is measured from the start of the... across a ECGElectrocardiogram; also called an EKG; a representation of electrical voltage measured across the chest over a period of time. 1. Six Second ECG Guidebook (2012), T Barill, p. 196 rhythmOften refers to a discernible pattern in time or distance between QRS complexes and/or P waves. strip points to an absence of any relationship between the atria and the ventricles. This is known as atrioventricular (AV) dissociationThe atria and the ventricles are firing independently of each other (i.e. complete heart block and ventricular tachycardia). The presence of an entirely chaotic PR interval across a ECG rhythm strip points to an absence of any relationship between the....
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. 192