Download 2008 Kaplan USMLE Step 1 Home Study Program-Brand New Volume by Kaplan PDF

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Read or Download 2008 Kaplan USMLE Step 1 Home Study Program-Brand New Volume III: Organ Systems Book 1 PDF

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Extra info for 2008 Kaplan USMLE Step 1 Home Study Program-Brand New Volume III: Organ Systems Book 1

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F. On the ECG, the isoelectricTP segment is recorded. 3. Diastasis (duration dependson heart rate) is the period of slow ventricular filling. In a Nutshell a. Left ventricular pressure and left ventricular volume slowly increase,due to the slow filling. b. Left atrial pressure slowly increases,due to continued left atrial filling from the pulmonary veins. c. Aortic pressure decreasesslowly, due to the continued drainage of blood into the peripheral arteries. d. On the ECG, the end of the isoelectricTP segment is recorded.

On the ECG, the P wave (atrial depolarization) startsjust before the beginning of atrial systole,triggering atrial muscle contraction. 2. Left atrial pressure increasesasthe left atrium contracts,causingthe a wave. 3. Left ventricular pressure increases,paralleling the a wave,but remains below left atrial pressure. Thus, the pressuregradient for ventricular filling is maintained. The left ventricular pressureat the end of atrial systolerepresentsthe left ventricular end-diastolic pressure. 4. Leftventricular volume increases= 20o/oto its maximum value during the cardiac rycle (= 120 ml), the end-fiastolic volume.

In a Nutshell NormalCardiac Conduction -+ -> SAnode atrialmuscle AVnode+ Hisbundle and bundle branches + Purkinje fibers + ventricular muscle B. Electrophysiologic categories of cardiac cells 1. Cardiac cellscan be divided into two electrophysiologiccategories: a. Fast fibers: atrial and ventricular muscle cells,Purkinje cellsof the His-Purkinje system b. Slow fibers: SA node, AV node 2. Fast fiber versus slow fiber terminology is based primarily on the velocity at which the electricalimpulse is conducted.

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