#drnajeeb #cardiology #cardiaccycle #medicines #systolic #diastolic
Cardiac Cycle | Cardiology | Systole & Diastole | Cardiovascular🫀
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▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
00:00:00 Start
00:00:47 What Is Cardiac Cycle?
00:01:41 Events In Left Side Of Heart
00:07:49 Onset Of Ventricular Contraction
00:10:52 Closure Of Mitral Valve (First Heart Sound)
00:12:30 Isovolumetric Contraction
00:14:30 C Wave
00:18:30 Rapid Ventricular Ejection
00:22:49 V Wave
00:25:43 Slow Ventricular Ejection Phase
00:30:45 Isovolumetric Relaxation
00:35:10 Rapid Passive Ventricle Filling Phase
00:38:50 Slow Passive Filling Phase
00:42:12 Repetition Of Cycle
00:43:05 Time Od Systole And Diastole
00:45:30 Heart Sound During Cycle
00:49:55 Pressures In Multiple Vessels And Chambers
00:50:53 Q&A About S3 And S4
00:51:55 Graphical Representation Of Cardiac Cycle
00:52:26 Parameters
00:52:45 Atrial Contraction
00:57:06 Rapid Progressive Filling Phase
01:05:06 S3 Sound
01:05:22 Slow Progressive Filling Phase
01:05:38 S4 Sound
01:08:45 Ecg
01:10:30 Summary
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The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, dubbed systole. After emptying, the heart immediately relaxes and expands to receive another influx of blood returning from the lungs and other systems of the body, before again contracting to pump blood to the lungs and those systems. A normally performing heart must be fully expanded before it can efficiently pump again. Assuming a healthy heart and a typical rate of 70 to 75 beats per minute, each cardiac cycle, or heartbeat, takes about 0.8 seconds to complete the cycle. There are two atrial and two ventricle chambers of the heart; they are paired as the left heart and the right heart—that is, the left atrium with the left ventricle, the right atrium with the right ventricle—and they work in concert to repeat the cardiac cycle continuously, (see cycle diagram at right margin). At the start of the cycle, during ventricular diastole–early, the heart relaxes and expands while receiving blood into both ventricles through both atria; then, near the end of ventricular diastole–late, the two atria begin to contract (atrial systole), and each atrium pumps blood into the ventricle below it. During ventricular systole the ventricles are contracting and vigorously pulsing (or ejecting) two separated blood supplies from the heart—one to the lungs and one to all other body organs and systems—while the two atria are relaxed (atrial diastole). This precise coordination ensures that blood is efficiently collected and circulated throughout the body.
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