Cardiac Output and Cardiac Index - Preload, Afterload, Contractility, And More - Explained Clearly
4.7 هزار بار بازدید -
2 سال پیش
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Cardiac output and cardiac index
Cardiac output and cardiac index are two critical concepts to understand. Master these topics and the things contributing to them in this 20 minute video! We tie together preload, afterload, contractility, heart right, end diastolic volumes, the cardiac cycle, Frank Starling curves, Anrep Affect, and more in a clear and concise manner! We also talk about the physiologic things that contribute to these different variables.
Cardiac output is the amount of blood the heart squeezes out every minute. It is equal to the stroke volume times the heart rate. What contributes to these two variables though? The stroke volume is the end diastolic volume minus the end systolic volume and is affected by three things: preload, afterload, and contractility. The preload is the end diastolic volume, which is essentially the amount of blood in the ventricle right before is starts to contract in systole. As it increases, stroke volume tends to increase up until the ventricle becomes overstretched as demonstrated by the Frank Starling curve. The after load is the pressure that the ventricle has to contract against. Typically, as the after load increases the stroke volume decreases. The exception to this is the Anrep Affect, which we explain. Contractility is how powerful of a contraction the heart muscles make. As it increases, the strove volume increases. It is intimately connected to and affected by preload and afterload. Heart rate is more straightforward, but remember that there is a point where continued increases in heart rate actually decrease cardiac output given too short of time for diastolic filling. Cardiac index then is the cardiac output divided by the body surface area, which provides a more informative look at how well the body is being supplied with blood.
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DISCLAIMER THIS VIDEO DOES NOT PROVIDE MEDICAL ADVICE. The information, including but not limited to, text, graphics, images and other material contained on this website are for informational purposes only. No material on this site is intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of your physician or other qualified health care provider with any questions you may have regarding a medical condition or treatment and before undertaking a new health care regimen, and never disregard professional medical advice or delay in seeking it because of something you have read, watched, or listened to on this video, or any other videos, reports, texts tweets or other sources.
#medicaleducation #physiology #teaching
Cardiac output is the amount of blood the heart squeezes out every minute. It is equal to the stroke volume times the heart rate. What contributes to these two variables though? The stroke volume is the end diastolic volume minus the end systolic volume and is affected by three things: preload, afterload, and contractility. The preload is the end diastolic volume, which is essentially the amount of blood in the ventricle right before is starts to contract in systole. As it increases, stroke volume tends to increase up until the ventricle becomes overstretched as demonstrated by the Frank Starling curve. The after load is the pressure that the ventricle has to contract against. Typically, as the after load increases the stroke volume decreases. The exception to this is the Anrep Affect, which we explain. Contractility is how powerful of a contraction the heart muscles make. As it increases, the strove volume increases. It is intimately connected to and affected by preload and afterload. Heart rate is more straightforward, but remember that there is a point where continued increases in heart rate actually decrease cardiac output given too short of time for diastolic filling. Cardiac index then is the cardiac output divided by the body surface area, which provides a more informative look at how well the body is being supplied with blood.
👇DON'T MISS OUT - JOIN OUR PATREON COMMUNITY TODAY 👇
Patreon: WhiteBoardMedicine
We appreciate the support!
📰👇SIGN UP FOR OUR FREE BIMONTHLY NEWSLETTER👍👍
https://whiteboarddoctor.m-pages.com/...
Stay up-to-date on the most important medical, science, and healthcare news!
COLLECTION OF PLAYLISTS:
Critical Care Medicine 🚑
Critical Care
Pulmonology🫁
Pulmonology
Cardiology and ECG🫀
Cardiology
Nephrology🧂
Nephrology
Acid Base🧬
Acid-Base Disorders
Medical, Healthcare, and Science News📰
Medical, Healthcare, And Science News
Biostatistics and Research📊
Biostatistics and Research Design
Immunology🧫
Immunology
Laboratory Evaluation and Values🧪
Laboratory Values
Infectious Disease🦠
Infectious Disease
Obstetrics and Gynecology👶
Obstetrics and Gynecology
Procedures💉
Procedures
Endocrinology🎂
Endocrinology
________________________________________________________________________
If you enjoy the content and feel inclined, here are some ways in which you can support us! Funds will go towards purchasing better equipment/software, dedicating more time to the channel, and continuing to strive towards taking this channel to the next level!
PayPal:
https://www.paypal.com/donate?hosted_...
YouTube Membership tab:
It has a “Join” button at the top right corner of our Channel’s home page. We appreciate you!
DISCLAIMER THIS VIDEO DOES NOT PROVIDE MEDICAL ADVICE. The information, including but not limited to, text, graphics, images and other material contained on this website are for informational purposes only. No material on this site is intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of your physician or other qualified health care provider with any questions you may have regarding a medical condition or treatment and before undertaking a new health care regimen, and never disregard professional medical advice or delay in seeking it because of something you have read, watched, or listened to on this video, or any other videos, reports, texts tweets or other sources.
#medicaleducation #physiology #teaching
2 سال پیش
در تاریخ 1401/09/02 منتشر شده
است.
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