By Fred M. Kusumoto
Over the decade, there was a major development in our realizing of easy cardiac electrophysiology. such a lot introductory electrocardiogram (ECG) books educate through trend attractiveness and don't include new pathophysiologic details.
There is a brilliant desire for an easy booklet that teaches electrocardiography from a pathophysiologic foundation. ECG Interpretation: From Pathophysiology to medical Application has been written to fill this hole. it may be applied as a reference - bankruptcy by way of bankruptcy or learn all through for an summary. every one bankruptcy will finish with questions that offer a bankruptcy assessment. Case experiences are highlighted on the finish of the e-book that combine the a number of rules of electrocardiography.
Fred Kusumoto, MDis affiliate Professor of drugs, Electrophysiology and Pacing carrier, department of Cardiovascular ailments, division of medication, Mayo hospital, Jacksonville, Florida.
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Additional info for ECG Interpretation: From Pathophysiology to Clinical Application
3. In a patient with left ventricular hypertrophy the QRS complex will generally: A. Be shorter in duration due to more profuse development of the HisPurkinje system. B. Be longer due to larger mass of ventricular tissue. C. Be unchanged due to minimal histologic changes. 4. The ECG in Figure 8 shows: A. B. C. D. Nothing this is a normal ECG. Borderline left ventricular hypertrophy. Severe left ventricular hypertrophy. Right ventricular hypertrophy. Figure 8: ECG for Problem 4. Answers 1. The correct answer is D.
An electrocardiogram is shown in Figure 10. What is the abnormality? Figure 10: ECG for Problem 1. 2. An electrocardiogram is shown in Figure 11. What is the abnormality? 3. An electrocardiogram is shown in Figure 12. What is the abnormality? 60 5 Conduction abnormalities in the His-Purkinje tissue Figure 11: ECG for Problem 2. Figure 12: ECG for Problem 3. Answers 1. The ECG shows a rhythm strip of leads V1 , V4 , V5 , V6 , II, and aVF. The patient has LAFB with intermittent RBBB. 12 s) and in lead V1 every other QRS complex is wider and characterized by an rSR’ complex, characteristic of RBBB.
Unfortunately, all of the ECG criteria for left ventricular hypertrophy have shortcomings, and although they are all relatively specific they are fairly insensitive markers (Table 2). In other words, if the ECG finding is present the patient probably has left ventricular hypertrophy, with most false positive rates < 10%. However, the ECG markers will identify only a relatively small proportion (11–70%) of patients with left ventricular hypertrophy. Right ventricle Several criteria have been developed for detection of right ventricular hypertrophy.