Preload and Afterload Nursing | Stroke Volume, Cardiac Output Explained
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- เผยแพร่เมื่อ 29 ก.ค. 2024
- Preload vs. afterload nursing review of stroke volume and cardiac output.
What is cardiac preload and afterload?
Cardiac preload is the amount the ventricle stretch at the end of diastole. Diastole is the filling or relaxation phase of the cardiac cycle. Preload is the amount of blood volume that fills that ventricle when the filling phase is over. Therefore, it is also called the end-diastolic volume (EDV).
Cardiac afterload is the pressure the ventricles must work against to open the semilunar valves so blood can leave the ventricle and enter either the lungs or systemic circulation. Afterload is influenced by vascular resistance, which is either pulmonary (which affects the right ventricle) or systemic vascular resistance (which affects the left ventricle).
Preload and afterload play an important role in affecting cardiac output because they influence stroke volume. Cardiac output is the amount of blood pumped by the heart per minute, and it's calculated by the heart rate times the stroke volume.
Stroke volume is the amount of blood pumped by a ventricle per beat. The three factors that influence stroke volume are contractility, preload, and afterload.
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Thank you so much for this video and the free quiz! Haven't seen anyone do that before and that is always what I am most worried about is how it will be asked. So thank you for doing that.
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In my last semester of nursing school and never understood preload or afterload until I watched this video! Thank you so much 🙏🏻
These videos are a God send in order to pass critical care. So thankful I found these and can rewind and pause as many times as I need to really understand the material. The quizzes are awesome too in letting me know what I need to go over again and in making sure I fully understand and can apply the material in the same way I need to on an exam. Thank you so much for all of this!
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How's the program going?
I was struggling with preload and afterload and this made it so much easier, thank you for all that you do!!
Ms. Sarah, I would just love you to say thank you for posting all of these videos. I get so frustrated sometimes because my professor gives us loads of PowerPoints and never really goes into detail it’s missing pieces that’s causing me to not understand the concept! Every time I don’t understand something, I immediately go to your videos and you go through ABSOLUTELY EVERYTHING that my professor goes over and MORE! You repeat some things in your video and it helps significantly. Thank you so much for making school for me so much less difficult. I love love love and appreciate you so much for helping me and for others when you don’t have too. I hope you are well mentally and physically and will be sending lots of love and blessings! THANK YOU from a future NP ❤️
Am currently taking advanced pathophysiology online . You’re the best teacher
Sarah, thank you so much for taking the time to make such informative and high-quality videos. I just started my med/surg 2 semester and my professor spent 20 minutes trying to explain preload and afterload to us only to make it 10x more confusing for everyone. Thanks to you, it all makes so much more sense! :)
So many of us owe you a big thanks for helping us through nursing school and passing our NCLEX. Here I am coming back to your videos in preparation for the cardiac ICU. You are a God-send!
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This was so much easier so understand than when my teacher just flew through it in lecture, thank you!
It’s sometimes easy to mix up drug/physiological effects on pre or afterload. Nice video!
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congrats!!!
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I have an exam for Medsurg coming up and we only get lecture powerpoint slides and an in class lecture, but you've explained it in a much shorter time and it's easier to understand. Thank you!
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congrats! may I ask what you specialize (if you do) in now?
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Best explanation of preload and afterload ever !! awesome
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I would not be passing nursing school without your videos and quizzes. I love the way you teach your material and the quizzes really help me review. I love being able to come to your page and get the material explained to me in another way that helps me learn and understand it better! Thank you so much for everything that you do!
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I deeply understand about the preload and after load thanks to your video. Thank you very much :)
I want to send you a gift when I graduate. Thank you. Our MedSurg professor is so bad at teaching I had to watch your video to comprehend.
So helpful! Taking the CCRN and this is a great review.
You have made it simple and easy peasy. Thanks a ton!
Very good missy ! Some of the doctors videos don’t touch you at all. Great job , now I understand
This video is awesome and I subbed. I love the use of the balloon to demonstrate the concept. One area I'm really interested in is cardiac nursing, because it does not change like other specialties such as cancer. I worked oncology as a CNA for 2 years and I just felt like I could never keep up with all the changes. I also like all the technology used in cardiac and it's neat to see what they come out with next. You can use your phone now to monitor your heart-so cool.
This video is absolutely amazing!! Thank you!
THANK YOU THANK YOU THANK YOU FOR MAKING THIS!!! SUPER HELPFUL!!!!
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Thank u thank u ...cant thank u enough especially for the ABG videos...tic tac method helped me alot...thank u
This was by far the best video on this topic
i loved the free quiz at the end! thank you for your explanation, it really helped me to understand cardiac physiology :)
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This was incredibly helpful! Could you make a future video going over all the heart failure medications and their specific impact on afterload and preload? I keep finding conflicting info and it's super confusing. Thanks so much 🙏
The lecture was clear, concise, and informative.
The balloon pushed it right over the top, now I get it! Thank you!
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