51. Ventricular tachycardia
52. Sinus tachycardia
53. Ventricular pacer rhythm
54. Idioventricular rhythm
55. Junctional tachycardia into sinus bradycardia (observe the #5 QRS compex with no discernable P wave before it; this supports your determination that this is a junctional tachycardia and not supraventricular)
56. First degree AV Block (note long PR intervals)
57. Wolff-Parkinson-White syndrome (P wave is IMMEDIATELY followed by delta wave)
58. Normal sinus rhythm with a premature junctional contraction (note, this is not an escape beat as there is usually a pause before an escape beat)
59. Second degree AV Block: Mobitz Type I (Wenkebach) (progressively longer PR intervals and then a dropped QRS complex)
60. Normal sinus rhythm or sinus tachycardia depending on R to R you measure into accelerated idioventricular rhythm (AIVR is a rhythm from 40 to 120 b/min; remember, ventricular tachycardia is a rate greater than 120 beats/min)
61. Third degree AV Block (no relation of the P waves to the QRS complexes)
62. Normal sinus rhythm or sinus tachycardia depending on which R to R you have measured with a PVC
63. Atrial fibrillation
64. Second degree AV Block: Mobitz Type 2 (there is a sudden dropped QRS complex without a progressive lengthening of the PR interval)
65. Atrial flutter
66. Multifocal atrial tachycardia
67. Supraventricular tachycardia (note the narrow QRS complex)