Cases & Concepts Step 1: Pathophysiology Review by Aaron B. Caughey

By Aaron B. Caughey

Instances & recommendations Step 1: Pathophysiology overview is helping scientific scholars organize for USMLE Step 1 by way of combining simple technology themes with medical information. operating via 88 scientific instances, the reader profits adventure reading instances, learns vintage shows of universal ailments and syndromes, and integrates easy technological know-how ideas with medical purposes. Sections disguise cardiovascular, pulmonary, renal, gastrointestinal, hematology, oncology, endocrinology, rheumatology, copy, and neuroscience. circumstances are by means of USMLE-style questions with solutions and rationales. Thumbnail and Key inspiration bins spotlight key proof. A significant other site deals absolutely searchable textual content on-line.

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An SVT can be classified as AV node dependent if the tachycardia can be terminated by blocking the AV node with a vagal maneuver such as a carotid sinus massage or with use of an AV node-blocking agent (adenosine). The cardiac action potential is divided into five phases and is detailed in Table 1-12 and Figure 1-16. All SVTs result from a disorder of either impulse formation or impulse conduction. Normal impulse formation depends on the intrinsic automaticity that is present in the SA node, some 20 areas of the atria, the AV node, and the bundle of His.

Treatment usually requires an electronic Aorta Sinoatrial node SVC LA RA Atrioventricular node RV LV IVC Right bundle branch • Figure 1-26. Cardiac conduction system. qxd 11/14/08 5:25 PM Page 25 CASE 1-5 / Arrhythmias pacemaker for the bradycardia and antiarrhythmic drug therapy for the tachyarrhythmia. When SA node activity is suppressed for a prolonged period in severe sinus node dysfunction, pacemaker foci in the AV node or ventricle generate escape rhythms to maintain an adequate heart rate.

AF B. Multifocal atrial tachycardia C. Atrial flutter D. Sinus tachycardia E. AV nodal re-entry tachycardia 2. SH is an 18-year-old woman who complains of palpitations, and her work-up is still pending. She was wondering whether radiofrequency ablation could be the appropriate treatment for her palpitations. Which diagnosis would be the most suitable and straightforward for radiofrequency ablation? A. Multifocal atrial tachycardia B. AF C. Typical atrial flutter 26 D. Atypical atrial flutter E.

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