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Identify the following bundle branch blocks. 1. 2. 3. 4. 5. 6. 7. Answers 1. Left bundle branch block Monophasic R waves are present in I, V5, and V6 with a deep S wave in V1. 2. Left bundle branch block The R waves in V5 and V6 are characteristic of a left bundle branch block. 3. Left bundle branch block The broad R waves in V5 and V6 are indicative of a left bundle branch block.  In V1, there is a notched S wave followed by ST elevation in the opposite direction of the terminal down stroke. 4. In V6 there is a monophasic R wave and in V1 there is a small R wave followed by a deep S wave.  Both are characteristic of a left bundle branch block 5. Right bundle branch block The RSR pattern in V1 is indicative of a right bundle branch block. 6. Right bundle branch block In V1 the the QRS complex has a "rabbit ear" appearance that is characteristic of a right bundle bra...

Identify the following bundle branch blocks 1. 2. 3. 4. 5. 6. 7. Answers 1. Left bundle branch block In the left leads I, V5, and V6 there are wide monophasic R waves. 2. Right bundle branch block In the right lead, V1, there is a wide, notched, QRS complex. 3. Left bundle branch block In lead I and V6 there are wide QRS complexes.   The complex in V6 has a RSR pattern. 4. Left bundle branch block In lead I and V6 there are wide QRS complexes.   In lead V6 the terminal down stroke of the QRS complex is slurred. 5. Right bundle branch block The right, V1, lead shows a RSR pattern typical of a right bundle branch block 6. Right bundle branch block In V1 there is a RSR pattern 7. Non-specific intraventricular conduction delay The QRS complex is greater that 0.12 sec.  There are no specific characteristics that would identify this as either a right or...

Identify the following bundle branch blocks. 1. 2. 3. 4. 5. 6. 7. Answers 1. Left bundle branch block In lead I there is a broad monophasic R wave that is characteristic of a left bundle branch block.  The ST segment is opposite the initial R wave.  In V1 there are very deep, broad S waves. 2. Left bundle branch block In both leads I and V6 there are broad monophasic R waves.  In V6 the slurring of the terminal portion of the R wave is very pronounced. 3. Right bundle branch block In V1 the wide RSR pattern show this to be a right bundle branch block. 4. Incomplete right bundle branch block The QRS complex of V1 is less than 0.12 sec so this make the right bundle branch block incomplete. 5. left bundle branch block The left bundle branch block is identified in lead I by the tall, broad, notched QRS complex. 6. Right bundle branch block The right bundle branch b...

Identify the following bundle branch blocks. 1. 2. 3. 4. 5. 6. 7. Answers 1. Incomplete right bundle branch block The right V1 lead show an RSR pattern but the QRS complex is less than 0.12 sec. making it an incomplete right bundle branch block.  The R waves in the left chest leads of I, V5, V6 demonstrate normal activation of the left ventricle while the deep S wave demonstrates slower activation of the right ventricle. 2. Left bundle branch block In lead I the tall wide broad R wave is characteristic of a left bundle branch block.  As the impulse travels away from the positive electrode of lead I it causes an initial negative Q wave.  After activation of the right ventricle, the electrical impulse travels from right to left across the myocardium and back towards the positive electrode and produces the positive R wave. 3. Right bundle branch block Lead V1 shows and RSR pattern wit...