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Ebook Pathophysiology of disease flashcards: Part 2

(BQ) Part 2 book "Pathophysiology of disease flashcards" presents the following contents: Cardiovascular disorders heart disease, cardiovascular disorders - Vascular disease, disorders of the adrenal medulla, gastrointestinal disease, liver disease, disorders of the exocrine pancreas, renal disease, disorders of the endocrine pancreas,. Invite you to consult. | 49 Arrhythmia A A 25-year-old man presents to the hospital with lightheadedness and palpitations for the past 2 hours. He had four or five previous episodes of palpitations in the past but they had lasted only a few minutes and went away on their own. These episodes were not associated with any specific activity or diet. He denies any chest pain. On physical examination he is noted to be tachycardic with a heart rate of 180 bpm and a blood pressure of 105 70 mm Hg. An ECG shows a wide complex tachycardia at 180 bpm. The tachycardia terminates suddenly and the patient s heart rate drops to 90 bpm. A repeat ECG shows sinus rhythm with a short PR interval and a wide QRS with a slurred upstroke delta wave . The patient is diagnosed as having the Wolff-Parkinson-White syndrome. 1. What class of tachycardia occurs in the Wolff-Parkinson-White syndrome and how common is it suosaad 0001 tn I ẤỊajBunxojđđB in sjnaao aUIOipUẨS 1ỊL -tlositpjj 1 -JJ aqi Mojaq aas jmaaia jtiEjjuaaj E UIOJJ asựE SEỊUiqjẨqjjEẨqaEj qans EỊUitỊỊÁiỊUEÁqaEỊ ỊUEjỊtiaaj E JO ajduiExa paipnjs jsaq aqThjqsqojd SỊ auioapuẨs ajiq y-uostnqjEj-jjjo w aqi A premature atrial contraction takes place when the AV nodes are ready to conduct but the accessory pathway is still refractory The impulse conducts to the ventricles via the AV node By the time the impulse reaches the accessory pathway enough time has elapsed so that the accessory pathway has recovered excitability The cardiac impulse can travel in retrograde fashion to the atria over the accessory pathway and initiate a reentrant tachycardia 9iJuojpuẨs 9 Ị q V -U OS u Ị J 6 J-JJ O V eqỉ UỊ ỊnDJỊD U6J U99J 6 9 6Ị Ị u Ị U6D eq S U9A9 JO oouonbos uo LU LU OD 6 SỊ eqM E In the Wolff-Parkinson-White syndrome an accessory pathway is present that is usually composed of normal atrial or ventricular tissue Because part of the ventricle is pre-excited over the accessory pathway rather than via the atrioventricular AV node the surface ECG shows a short PR interval .