Cardiology Nursing 1 Humber Final Exam |302 Questions And Answers(Including Diagrams).

Measure the PR Interval {Ans: Measure from the beginning of the P wave as it leaves baseline to the beginning of the QRS complex. Count the number of small squares contained in this interval and multiply by 0.04}Junctional arrhythmias {Ans: When a junctional focus fires, the wave of depolarization spreads backward (retrograde)into the atria as well as forward (antegrade) into the ventricles. Junctional beats and junctional rhythms can appear any of three ways on the ECG depending on the location of the junctional pacemaker site and the speed of conduction of the impulse into the atria and ventricles: If the impulse arrives in the atria before it arrives in the ventricles, the P wave will be before the QRS complex. The P waves will be inverted (due to retrograde depolarization of the atria) and the PR interval will be short (0.10 second or less). The QRS is normal duration. •If the impulse arrives in the ventricles before it arrives in the atria, the P wave will be after the QRS complex. The P wave will be inverted and the PR interval will be short (0.10 second or less). The QRS complex is normal duration. •If the impulse reaches