Understanding the pressure-volume loop | Circulatory system physiology | NCLEX-RN

Understanding the pressure-volume loop | Circulatory system physiology | NCLEX-RN | Khan Academy

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11 жыл бұрын

Figure out how all of those physiology terms: end-systolic, end-diastolic, pulse pressure, stroke volume, and ejection fraction, can be easily figured out using the pressure-volume loop. Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai.
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Пікірлер: 41

@silvertix2996 5 жыл бұрын

This channel is the reason i don’t die from stress in med school

@ThomThom369 9 жыл бұрын

this is great! so much better than my actual class lecture

@Noedeltas 8 жыл бұрын

Thank you sir, for the amazing explaination!

@jrask 11 жыл бұрын

I'm going to have to by you lunch one day because I appreciate this videos a ton. You're an excellent teacher, thank you.

@iamshattered 11 жыл бұрын

Awesome video. It really helped!! Thanks!!

@damarisgarcia87 11 жыл бұрын

This is much better than trying to understand the book. Thank you so much for taking the time to create this videos :)

@skyman2906 8 жыл бұрын

You mad it very easy to understand ! thanks

@LoolJohn 10 жыл бұрын

tremendously helpful!

@altafmalik4446 7 жыл бұрын

you sound so awesome i swear! thaaaanks a ton. 💕

@michelle-fw3ic 3 жыл бұрын

you are doing gods work . thank u so much

@Ameagle7 10 жыл бұрын

@Jon Coleman, Yes! Isovolumetric contraction is the portion of the PV loop from "End-Diastolic" Point to where it starts to move back towards the left (Indicating the volume going down). That is, the beginning of systole, up until the point where there is an actual change in volume. Likewise, Isovolumetric relaxation is the left-most portion of the loop. The "End-Diastolic" Point to where it starts to move back towards the right (Indicating the volume going back up, or "filling" of the ventricle."

@edwardherrera846 6 жыл бұрын

Isovolumetric contraction is where all four valves are closed. It is the beginning of systole. Pressure is being built up in the ventricles until the pressure is greater than the pressure in the aorta and pulmonary artery. Once that happens, the aortic and pulmonic valves open and blood starts to eject out. That is the point where isovolumetric contraction ends.

@manarmohammed3178 3 жыл бұрын

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@Louis-vx3sl 2 жыл бұрын

Thank you for the greatest explanation after struggling to understand a 1 hour lecture

@sanjeewajayalath4941 3 жыл бұрын

thank you , this realy help

@MrSaad909 11 жыл бұрын

Thanks a million , we are waiting for more videos

@elsherbini2333 8 жыл бұрын

thank you very much :D

@scottschaus4619 8 жыл бұрын

Hi. What software do you use to create these videos? Very nice presentation of tough concepts!

@mohamedelfatih6248 5 жыл бұрын

easy and very good explanatory

@Montana5473 8 жыл бұрын

The reason we should avoid terms like "Start-Systolic" and "Start-Diastolic" is very clear and here is why: When diastole starts both Aortic valve and mitral valve are in a "closed" state so no blood is moving in or out of left ventricle and the left ventricle is in a state of "isovolumetric relaxation" but there is "no movement of blood in or out of left ventricle" yet. So saying "Start-Diastolic Volume" is awkward since no blood has started moving in or out yet. On the other hand, a term like "End Diastolic Volume" makes perfect sense since "movement of blood" has happened because mitral valve had opened and now blood is moving into left ventricle and only at the end of this process we have an appreciable "volume of blood" inside left ventricle, hence the term "End-Diastolic Volume" and "End-Diastolic Pressure". It JUST MAKES SENSE.

@erksp7961 7 жыл бұрын

He added it for understanding, but "start-systolic" makes perfect sense. Systole starts at 10 mmHg and ends at around 100 mmHg. It is just convention man

@abdullahothman6557 8 жыл бұрын

thank u

@r_aorwa 3 жыл бұрын

-Here You go- Thanks a lot Keep it up ☺️ #logicalmedico

@stevenbeard2761 4 жыл бұрын

Very helpful- thank you! One thing I think needs to be pointed out is that the graph should start at 80 for this example and not 0. When you mentioned the pulse pressure you said the lowest pressure (which according to this graph is 0).

@stavshmueli6932 3 жыл бұрын

I think you're conflating between two things - The graph's Y axis represents a measurement of the left ventricle pressure, while the pressure that Rishi mentioned (130/80), focusing on the 80 mmHg value - is the end diastolic pressure with respect to the Aorta - which is indeed correct, the lowest pressure of the Aorta (The end diastolic pressure of the Aorta) is not very low, whereas the pressure of the left ventricle goes much below 80. I think Rishi should've clarified that bit, but nevertheless, great video.

@amitabhbehera9759 4 жыл бұрын

Thnk u

@nickzsidisin62 Жыл бұрын

clutch excellent use of 10 minutes

@ellatep13 7 жыл бұрын

Is pulse pressure the difference between diastolic and systolic pressure? in the video both values look part of the systolic pressure.

@veckspeck5185 6 жыл бұрын

It is, remember diastolic pressure is the lowest pressure reached in the arterial bloodstream (aorta) during a heartbeat. This is the pressure right before the aortic valve opens. Just after the aortic valve opens the pressure (and volume) in the aorta increase up until the maximal pressure reached; systolic pressure. I understand your confussion.

@vaishnaviramakrishna265 5 жыл бұрын

Veck Speck thanks for the quick explanation!! I had the same doubt!