8/20/ Apply Your Knowledge The standard 12-lead ECG focuses directly on what part of the heart? 14.1 Apply Your Knowledge
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1 Electrocardiography for Healthcare Professionals Chapter 14 Basic 12-Lead ECG Interpretation Learning Outcomes 14.1 Discuss the anatomic views seen on a 12-lead ECG and the coronary artery that commonly supplies that region of tissue Identify common morphologic changes associated with ischemia, injury, and infarction. Learning Outcomes (Cont d) 14.3 Define axis deviation, and list the steps utilized to determine the presence of axis deviation Define bundle branch block (BBB), identify what makes BBB unique, differentiate left from right BBB, and list the steps to determine the presence of BBB. Learning Outcomes (Cont d) 14.5 Describe left ventricular hypertrophy (LVH), and list the steps to determine the presence of LVH The Views of a Standard 12-Lead ECG and Major Vessels Leads II, III, and avf: Inferior wall of left ventricle Right coronary- Marginal branch Leads V1 & V2: Septal wall Left coronary-septal branch The Views of a Standard 12-Lead ECG and Major Vessels (Cont d) Leads V3 & V4: Anterior wall of left ventricle Left coronary- Left Anterior Descending Leads I, avl, V5 & V6: Lateral wall of left ventricle Left coronary- Left circumflex Apply Your Knowledge The standard 12-lead ECG focuses directly on what part of the heart? 14.1 Apply Your Knowledge 1
2 The standard 12-lead ECG focuses directly on what part of the heart? Answer: Left ventricle Determining Ischemia, Injury, or Infarction Step 1: Determine the ECG rhythm or regularity Step 2: Determine the artrial and ventricular rate Step 3: Identify the P wave configuration Step 4: Measure the PR interval Step 5: Measure the QRS duration and analyze the configuration Anatomically contiguous lead: 2 or more leads looking at the same part of the heart Includes: II, III, avf I, avl V1, V2, V3, V4, V5, V6 T wave inversion: A positively deflected waveform In ischemia, will be negatively deflected May be by itself or seen with ST segment elevation ST Segment Elevation: Referred to as myocardial injury, acute injury pattern, or acute MI Physiologic Q wave: Normal Q wave Measures less than 0.04 second Depth measures less than 1/3 height of R wave Pathologic Q wave: Shape changes due to tissue death Measures 0.04 second and/or greater than or equal to 1/3 height of the R wave Indicates tissue death in heart if seen in 2 or more anatomically contiguous leads 14.2 Apply Your Knowledge What is ST segment elevation seen on a 12-lead ECG often referred as? 14.2 Apply Your Knowledge 2
3 What is ST segment elevation seen on a 12-lead ECG often referred as? Answer: Myocardial injury, acute injury pattern, or acute MI Causes of Axis Deviation Left Axis Deviation: Left ventricular hypertrophy Pregnancy Obesity Emphysema Hyperkalemia 14.3 Causes of Axis Deviation (Cont d) Right Axis Deviation: Right ventricular hypertrophy Anterolateral wall MI Considered normal in children and tall, thin adults 14.3 Causes of Axis Deviation (Cont d) Extreme Right Axis Deviation: Situs transversus or dextrocardia (heart is on the right side of chest) Pacemaker rhythms COPD patients Hyperkalemia 14.3 Determining the Presence of Axis Deviation Step 1: If lead I is up, avf is up, axis is normal Step 2: If lead I is up, avf is down, patient has left axis deviation Step 3: If lead I is down, avf is up, patient has right axis deviation Step 4: If lead I is down, avf is down, patient has extreme right axis deviation 14.3 Apply Your Knowledge What are the two leads to refer to when determining the presence of axis deviation? 14.3 Apply Your Knowledge What are the two leads to refer to when determining the presence of axis deviation? Answer: Leads I and avf Bundle Branch Block QRS duration: Wider than normal (0.12 second or greater) Right Bundle Branch Block (RBBB): 3
4 24 QRS is positively deflected Classic RSR pattern in V1 Referred to as bunny ears or bunny branch block 14.4 Bundle Branch Block (Cont d) Left Bundle Branch Block (LBBB): QRS is negative or a QS complex is present To determine the presence of BBB look for: Evidence of atrial activity (P wave) QRS complex 0.12 second or greater Bundle Branch Block (Cont d) Apply Your Knowledge Which lead is referenced to distinguish between right and left bundle branch blocks? 14.4 Apply Your Knowledge Which lead is referenced to distinguish between right and left bundle branch blocks? Answer: Lead V Left Ventricular Hypertrophy (LVH) Abnormal thickening of ventricular wall The wall thickens due to increased vascular resistance over time QRS complex shows greater amplitude Taller and deeper ventricular depolarization waves will be seen 14.5 Determining the Presence of LVH Step 1: Refer to V1 & V2 Measure and select the deeper of the 2 views Measure from the isoelectric line down to the tip of the deepest QS complex, count mm Write this number down Determining the Presence of LVH (Cont d) Step 2: Refer to V5 & V6 Measure and select the taller of the 2 views Measure from the isoelectric line to tip of tallest R wave, count mm Write number down 14.5 Determining the Presence of 4
5 32 33 LVH (Cont d) Step 3: Add the 2 numbers together If it adds up to 35 or more mm, clinically you would suspect left ventricular hypertrophy 14.5 Apply Your Knowledge When totaled, how many millimeters is the minimum necessary to clinically suspect left ventricular hypertrophy? 14.5 Apply Your Knowledge When totaled, how many millimeters is the minimum necessary to clinically suspect left ventricular hypertrophy? Answer: 35mm Chapter Summary Leads II, III, avf view the inferior wall of left ventricle. Leads V1 & V2 view the lateral wall of left ventricle. ST segment depression of 1mm or more indicates myocardial ischemia. ST segment elevation of 1mm or more indicates myocardial injury. Pathologic Q wave indicates tissue death or MI Electrical deviation causes changes in the ECG due to the position of the heart in the patient s chest. Bundle branch blocks occur when one or both of the ventricular pathways are damaged or delayed. BBB has a wider QRS duration (0.12 second or greater) Refer to V1 to differentiate RBBB and LBBB. LBBB presents with a P wave and a QS complex 0.12 second or more. RBBB presents with a P wave and a R wave that has 2 points and a QS complex of 0.12 second or more. Left ventricular hypertrophy is a thickening of the ventricular wall due to pumping against increased vascular resistance. LVH presents with greater amplitude of the QRS complex and taller and deeper ventricular depolarizations. 5
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