logging in or signing up 2.Cardiac Cycle doctorbhanuprakash Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 3942 Category: Education License: All Rights Reserved Like it (1) Dislike it (1) Added: December 08, 2009 This Presentation is Public Favorites: 4 Presentation Description No description available. Comments Posting comment... By: Arifath (41 month(s) ago) The duration of each cardiac cycle, when the heart rate is 72/minute, works out to about 0.8 seconds, not 0.3 seconds as mentioned in one slide. Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Cardiac Cycle : Cardiac Cycle Definition : Definition Cardiac cycle is defined as the sequence of coordinated events which take place during heartbeat. Each heartbeat consists of two major periods called systole and diastole. During systole there is contraction of the cardiac muscle and pumping of blood from the heart through arteries. Slide 3: During diastole , there is relaxation of cardiac muscle and filling of blood. Various changes occur in different chambers of heart during each heartbeat. These changes are repeated during every heartbeat in a cyclic manner. Divisions of cardiac cycle : Divisions of cardiac cycle The contraction and relaxation of atria are called atrial systole and atrial diastole respectively. The contraction and relaxation of ventricles are called ventricular systole and ventricular diastole respectively. Slide 5: How ever, in clinical practice, the term ‘systole’ refers to ventricular systole and ‘diastole’ refers to ventricular diastole. Thus, the events of cardiac cycle classified in to two divisions. 1. Systole 2. Diastole. Sub divisions and duration of cardiac cycle : Sub divisions and duration of cardiac cycle When the heart beats at the normal rate of 72/minutes , the duration if each cardiac cycle is about 0.3second. The duration of systole is 0.27 second and that of diastole is 0.53 second. Generally, systole is divided in to two sub divisions and diastole is divided in to five subdivisions. systole : systole Time (second) 1. Isometric contraction = 0.05 2. Ejection period = 0.22 ------ 0.27 ------ Diastole : Diastole Time(second) 1.Protodiastole = 0.04 2. Isometric relaxation = 0.08 3. Rapid filling = 0.11 4. Slow filling = 0.19 5. Atrial systole = 0.11 ------- 0.53 ------- Slide 9: The total duration of cardiac cycle is 0.27 + 0.53 = 0.8 second. Among the atrial events, systole occurs during the last phase of ventricular diastole. Atrial diastole is not considered as a separate phase, since it coincides with the ventricular systole and earlier part of ventricular diastole. The atrial systole extends for about 0.11 second and the duration of atrial diastole is about 0.69 second.s Description of events of cardiac cycle : Description of events of cardiac cycle For the sake of better understanding, the description of events of cardiac cycle is commenced with atrial systole. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.