A cardiac rhythmOften refers to a discernible pattern in time or distance between QRS complexes and/or P waves. that originates from the AV junctionConducts the impulse through the fibrous plate that separates the atria and the ventricles; consists of the AV node and the bundle of His; functions also to slow the conduction speed to allow for atrial conduction prior to ventricular conduction... 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 60-100/minute; QRS complexThe electrical representation of ventricular depolarization; the atrial repolarization is also a part of the QRS. ECG interpretation relies heavily on the QRS complex. The QRS complex represents the depolarization of the ventricles. The repolarization of the atria is also... is most often narrow with P wavesA wave generated from the depolarization of the atria; the P wave is upright when originating from the SA node. The P wave represents the depolarization of the right and left atria. The P wave begins with the first deviation... that are absent or inverted; 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... is often short.
When the heart rateThe number of QRS complexes per minute; note that HR may not equal perfused pulse rate. See also: - Step 1 Heart Rate - Rate - Rule of 300s (Triplicate Method) - Six Second Count - The Caliper Method 1.... goes above 100/minute this is called a junctional tachycardiaA cardiac rhythm that originates from the AV junction with a rate > 100/minute; QRS complex is most often narrow with P waves that are absent or inverted; PR interval is often short. junctional tachycardia, HR 158 1. Six Second....
PacemakerAn electronic pulse generator that stimulates depolarization of the atria and/or the ventricles. 1. Six Second ECG Guidebook (2012), T Barill, p. 201 sites can deliver impulses faster than typically expected. For example, pacemakers within 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. tend to generate rates of 20-40/minute. But these same pacemakers can, in certain circumstances, yield ventricular tachycardias (>100/minute). But what of rhythms that are not quite tachycardias but are faster than what is expected from a pacemaker site. These rhythms are called accelerated rhythms. For example, the junctionConnects the atria to the ventricle and slows the impulse conduction speed sufficiently to allow for atrial kick; the junction consists of the AV node and the bundle of His; the junction is a supraventricular structure. 1. Six Second ECG... usually fires at rates of 40-60/minute. A junctional rhythmA cardiac rhythm that occurs as a backup pacemaker when the sinus node fails to initiate an impulse; the junction typically fires at 40-60/minute; the P wave is either absent or inverted. A cardiac rhythm is usually named first by... with rates of 61-100/minute is called an accelerated junctional rhythm. Likewise, a ventricular rhythmA cardiac rhythm with the impulse originating in the ventricles and an absence of atrial activity (no P waves); heart rate is 20-40/minute; cardiac output is often poor with this slow rate and no atrial kick | cardiac rhythm that... with rates of 41-100/minute is an accelerated ventricular rhythm (or an accelerated idioventricular rhythmCardiac rhythm that originates from the ventricular with a rate of 40-100/minute; QRS is wide with P waves absent. Pacemaker sites can deliver impulses faster than typically expected. For example, pacemakers within the ventricles tend to generate rates of 20-40/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. 116, 118, 189