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Possible Causes of BBB Idiopathic HTN Congenital Heart Disease Ischemic Heart Disease Myocardial Infarction Valvular Heart Disease Infections of the Myocardium COPD Trauma Right Bundle Branch Block wide QRS, more than 120 ms (3 small squares) secondary R wave in lead V1 other features include slurred S wave in lateral leads and T wave changes in the septal leads Not always associated with pathology Incomplete ____: This shows the same QRS pattern as a complete _____; however, the QRS duration is between 0.1 and 0.11seconds. RBB http://o.quizlet.com/i/MkElgogUrIGj0xoj10Ff9g.jpg RBB http://o.quizlet.com/i/zTEUsFmE3Ez-HrqVQEI5kQ.jpg RBB block lengthened QRS > 0.12 sec in V1 and V2 R' slurred S wave in lateral leads V5, V6 downsloping ST segment in leads V1, V2 (septal LBB block http://o.quizlet.com/i/Y9E2Kd2m20kZ4IjzR-fA9Q.jpg Left Bundle Branch Block Blockage of conduction in the _____prior to its bifurcation results primarily in delayed depolarization of the ___ ventricle. Incomplete ____: This shows the same QRS pattern as a complete ___; however, the QRS duration is between 0.1 and 0.12 seconds. Unlike ____, _____ always is a sign of organic heart disease. http://o.quizlet.com/i/Y9E2Kd2m20kZ4IjzR-fA9Q.jpg LBB block ____ is characterized by a QS or rS configuration in V1, an R-R1 (notched 'R' wave) configuration in lead V6, and a QRS interval > 0.12 seconds. ST elevation in and upright T waves in V1, V2 ST depression and T wave inversion: I, V5, V6 Prolonged monophasic R waves in leads I, V5, V6 that are usually notched or slurred Fasicular/hemiblocks These are blockages of transmission that also may occur in the anterior or posterior branches of the left bundle branch. *****The main effect of a _____is to markedly change the QRS axis without changing the shape or duration of the QRS wave form.*** Bifascicular block in which defects occur in two of the three divisions of the bundle branches. More specifically, people with this condition may be diagnosed with "RBBB with left anterior hemiblock," "RBBB with left posterior hemiblock" or LBBB. These blocks are almost always associated with pathology usually CAD Trifascicular block in which there is a form of bifascicular block (as described above) as well as a complete AV Block. Usually associated with a bradycardia These blocks are almost always associated with pathology usually CAD Left Anterior Hemiblock:* ***Left axis deviation (-30 degrees or more)*** *****qR Complex Leads I and L; an rS complex in leads II, III, and F**** Norm or slightly prolonged QRS Left Posterior Hemiblock:* ***Right axis deviation (+90 degrees or more)** ******rS in Lead I followed by a Q wave in II, III, and F**** Norm or slightly prolonged QRS Tri-fascicular Block ____ refers to a block of all three fascicles (but with intact AV conduction). It usually refers to LBBB + a long PR interval. left bundle branch block 1.ST elevation in and upright T waves in V1, V2 2.ST depression and T wave inversion: I, V5, V6 3.Prolonged monophasic R waves in leads I, V5, V6 that are usually notched or slurred left bundle branch block is characterized by a QS or rS configuration in V1, an R-R1 (notched 'R' wave) configuration in lead V6, and a QRS interval > 0.12 seconds. right bundle branch block lengthened QRS > 0.11 sec in V1 and V2 R' slurred S wave in lateral leads V5, V6 downsloping ST segment in leads V1, V2 (septal) right bundle branch block. ***Not always associated with pathology** wide QRS, more than 120 ms (3 small squares) secondary R wave in lead V1 other features include slurred S wave in lateral leads and T wave changes in the septal leads Acute anterior infarction ______ produces significant Q aves with st elevation in the first few chest leads Anterior Considering only v1 and v2, the appearance of significant Q waves and ST elevation indicates_______ posterior infarction Susepect a _____ _____ when you see a large R wave in v1 or v2 Posterior acute ______(posterior/anterior) infarction is characterized by a large R wave and ST depression in v1 or v2 reverse transillumination or mirror test what do you do if you suspect an acute posterior infarction? You want to confirm a posterior infarction. You may see a sig Q with ST elevation in V1 and V2 What are you looking for when performing a reversed transillumination or mirror test? Anterior Hemiblock is a block of the anterior division of the lbb. finding a q in I and a wide or deep S in S3. (Q1,S3) (LAD also) What do you expect to see when dx an anterior hemiblock?