Back to Healio

BySteven Lome, MD

ECG Library

Save

New
All ECG 1 All ECG 2 All ECG 3 All ECG 4 All ECG 5 All ECG 6 All ECG 7 All ECG 8 All ECG 9 All ECG 10 All ECG 11 All ECG 12 All ECG 13 All ECG 14 All ECG 15 All ECG 16 All ECG 17 All ECG 18 All ECG 19 All ECG 20 All ECG 21 All ECG 22 All ECG 23 All ECG 24 All ECG 25 All ECG 26 All ECG 27 All ECG 28 All ECG 29 All ECG 30 All ECG 31 All ECG 32 All ECG 33 All ECG 34 All ECG 35 All ECG 36 All ECG 37 All ECG 38 All ECG 39 All ECG 40 All ECG 41 All ECG 42 All ECG 43 All ECG 44 All ECG 45 All ECG 46 All ECG 47 All ECG 48 All ECG 49 All ECG 50 All ECG 51 All ECG 52 All ECG 53 All ECG 54 All ECG 55 All ECG 56 All ECG 57 All ECG 58 All ECG 59 All ECG 60 All ECG 61 All ECG 62 All ECG 63 All ECG 64 All ECG 65 All ECG 66 All ECG 67 All ECG 68 All ECG 69 All ECG 70 All ECG 71 All ECG 72 All ECG 73 All ECG 74 All ECG 75 All ECG 76 All ECG 77 All ECG 78 All ECG 79 All ECG 80 All ECG 81 All ECG 82 All ECG 83 All ECG 84 All ECG 85 All ECG 86 All ECG 87 All ECG 88 All ECG 89 All ECG 90 All ECG 91 All ECG 92 All ECG 93 All ECG 94 All ECG 95 All ECG 96 All ECG 97 All ECG 98 All ECG 99 All ECG 100 All ECG 101 All ECG 102 All ECG 103 All ECG 104 All ECG 105 All ECG 106 All ECG 107 All ECG 108 All ECG 109 All ECG 110 All ECG 111 All ECG 112 All ECG 113 All ECG 114 All ECG 115 All ECG 116 All ECG 117 All ECG 118 All ECG 119 All ECG 120 All ECG 121 All ECG 122 All ECG 123 All ECG 124 All ECG 125 All ECG 126 All ECG 127 All ECG 128 All ECG 129 All ECG 130 All ECG 131 All ECG 132 All ECG 133 All ECG 134 All ECG 135 All ECG 136 All ECG 137 All ECG 138 All ECG 139 All ECG 140 All ECG 141 All ECG 142 All ECG 143 All ECG 144 All ECG 145 All ECG 146 All ECG 147 All ECG 148 All ECG 149 All ECG 150 All ECG 151 All ECG 152 All ECG 153 All ECG 154 All ECG 155 All ECG 156 All ECG 157 All ECG 158 All ECG 159 All ECG 160 All ECG 161 All ECG 162 All ECG 163 All ECG 164 All ECG 165 All ECG 166 All ECG 167 All ECG 168 All ECG 169 All ECG 170 Beginner ECG 1 Beginner ECG 2 Beginner ECG 3 Beginner ECG 4 Beginner ECG 5 Beginner ECG 6 Beginner ECG 7 Beginner ECG 8 Beginner ECG 9 Beginner ECG 10 Beginner ECG 11 Beginner ECG 12 Beginner ECG 13 Beginner ECG 14 Beginner ECG 15 Beginner ECG 16 Beginner ECG 17 Beginner ECG 18 Beginner ECG 19 Beginner ECG 20 Beginner ECG 21 Beginner ECG 22 Beginner ECG 23 Beginner ECG 24 Beginner ECG 25 Beginner ECG 26 Beginner ECG 27 Beginner ECG 28 Beginner ECG 29 Beginner ECG 30 Expert ECG 1 Expert ECG 2 Expert ECG 3 Expert ECG 4 Expert ECG 5 Expert ECG 6 Expert ECG 7 Expert ECG 8 Expert ECG 9 Expert ECG 10 Expert ECG 11 Expert ECG 12 Expert ECG 13 Expert ECG 14 Expert ECG 15 Expert ECG 16 Expert ECG 17 Expert ECG 18 Heart Blocks ECG 1 Heart Blocks ECG 2 Heart Blocks ECG 3 Heart Blocks ECG 4 Heart Blocks ECG 5 Heart Blocks ECG 6 Heart Blocks ECG 7 Heart Blocks ECG 8 Heart Blocks ECG 9 Heart Blocks ECG 10 Heart Blocks ECG 11 Heart Blocks ECG 12 Heart Blocks ECG 13 Heart Blocks ECG 14 Heart Blocks ECG 15 Heart Blocks ECG 16 Heart Blocks ECG 17 Heart Blocks ECG 18 Heart Blocks ECG 19 Heart Blocks ECG 20 Heart Blocks ECG 21 Heart Blocks ECG 22 Heart Blocks ECG 23 Heart Blocks ECG 24 Heart Blocks ECG 25 Heart Blocks ECG 26 Heart Blocks ECG 27 Heart Blocks ECG 28 Heart Blocks ECG 29 Heart Blocks ECG 30 Heart Blocks ECG 31 Heart Blocks ECG 32 Heart Blocks ECG 33 Heart Blocks ECG 34 Heart Blocks ECG 35 Heart Blocks ECG 36 Heart Blocks ECG 37 Heart Blocks ECG 38 Heart Blocks ECG 39 Heart Blocks ECG 40 Heart Blocks ECG 41 Heart Blocks ECG 42 Heart Blocks ECG 43 Heart Blocks ECG 44 Heart Blocks ECG 45 Heart Blocks ECG 46 Infarcts and Ischemia ECG 1 Infarcts and Ischemia ECG 2 Infarcts and Ischemia ECG 3 Infarcts and Ischemia ECG 4 Infarcts and Ischemia ECG 5 Infarcts and Ischemia ECG 6 Infarcts and Ischemia ECG 7 Infarcts and Ischemia ECG 8 Infarcts and Ischemia ECG 9 Infarcts and Ischemia ECG 10 Infarcts and Ischemia ECG 11 Infarcts and Ischemia ECG 12 Infarcts and Ischemia ECG 13 Infarcts and Ischemia ECG 14 Infarcts and Ischemia ECG 15 Infarcts and Ischemia ECG 16 Infarcts and Ischemia ECG 17 Infarcts and Ischemia ECG 18 Infarcts and Ischemia ECG 19 Infarcts and Ischemia ECG 20 Infarcts and Ischemia ECG 21 Infarcts and Ischemia ECG 22 Infarcts and Ischemia ECG 23 Infarcts and Ischemia ECG 24 Infarcts and Ischemia ECG 25 Infarcts and Ischemia ECG 26 Infarcts and Ischemia ECG 27 Infarcts and Ischemia ECG 28 Miscellaneous ECG 2 Miscellaneous ECG 3 Miscellaneous ECG 4 Miscellaneous ECG 5 Miscellaneous ECG 6 Miscellaneous ECG 7 Miscellaneous ECG 8 Miscellaneous ECG 9 Miscellaneous ECG 10 Miscellaneous ECG 11 Miscellaneous ECG 12 Miscellaneous ECG 13 Miscellaneous ECG 14 Miscellaneous ECG 15 Miscellaneous ECG 16 Miscellaneous ECG 17 Miscellaneous ECG 18 Miscellaneous ECG 19 Miscellaneous ECG 20 Miscellaneous ECG 21 Miscellaneous ECG 22 Miscellaneous ECG 23 Miscellaneous ECG 24 Miscellaneous ECG 25 Miscellaneous ECG 26 Miscellaneous ECG 27 Miscellaneous ECG 28 Miscellaneous ECG 29 Miscellaneous ECG 30 Miscellaneous ECG 31 Miscellaneous ECG 32 Miscellaneous ECG 33 Miscellaneous ECG 34 Miscellaneous ECG 35 Miscellaneous ECG 36

Beginner ECG 8

BySteven Lome, MD

AV Nodal Reentry Tachycardia (AVNRT)

This is a narrow-complex QRS rhythm which is quite fast. Looking closely at the last part of the QRS complex in leads V1 and V2, P waves can be seen. This is considered a "short RP tachycardia" and is from AVNRT. Adenosine, carotid massage or vagal maneuvers can terminate this rhythm.

AVNRT occurs when a reentrant circuit is present within the AV node itself. In this situation, there are two separate conduction pathways within the AV node instead of just one (present in about 5% of the general population). This is sometimes termed “dual AV nodal physiology”. One pathway is slower and has a long refractory period while the other is faster and has a short refractory period. Normal conduction occurs through the faster pathway with the longer refractory period.

If a premature atrial contraction (PAC) or premature ventricular contraction (PVC) occurs at the right time, the normal conduction pathway will still be refractory, so the action potential will conduct through the slower AV nodal pathway with the shorter refractory period instead. After this action potential reaches the ventricles or atrium, it will conduct back through the normal AV nodal conduction pathway since it will no longer be refractory and a reentrant circuit will be created. See the ECG strip below which shows a PVC initiating AVNRT:

Related Topic Reviews: AVNRT ECG Review, Determining Heart Rate

Read more about

atrial tachycardia

atrial arrhythmia