Passing A&P 1&2 for nursing through these videos!!! I study our given material and then come here to have it all make sense. It truly helps me envision the many A/P processes. The creator is seriously genius! Pictures and stories are everything. Thank you!!!
Actually you can and I have. I'm a paramedic and you can actually "shock" cardiovert a persons heart that is going intoV-tach or Supra ventricular tachycardia. It is very painful but often necessary. When the ventricles are fluttering they need to be restarted. You can shock the patient or we have drugs that can stop your heart for two seconds, hoping it returns to normal sinus rhythm. We use Adenosine if the patient is still awake and speaking to you instead of using the paddles.The patient will actually tell you they are dying. The drug allows the SA node or AV node to stop and restart. From the couple patients I had to do this to said it is very painful. Luckily we can provide comfort and analgesic medications before hand.
I gave someone CPR for nearly 4 minutes, I was about ready to try that whole "Don't you die on me bit." Thankfully the people who knew what they were doing showed up and got him to a hospital in time. I really hope to never have to do that again.
"Confused? Well I'm here to help your head understand your heart." Speak, wise one. We listen in desperation. Your words can teach more in ten minutes then the last 3 weeks (9+ hrs of just lecture, not counting lab) of class.
Using crashcourse to cement the information that I have been reading while studying for the MCAT. Thank you for your genius webseries. I'm a visual learner and it helps me so much to see the things that I just read! =D Love the cartoons & examples. Just so you know, when I'm a doctor I will fund you guys...please never stop! LOL.
the comprehensiveness of your videos amazes me.. you explain every single thing in utmost detail going down as deep as possible.. no dumbing down of any concept.. THIS CHANNEL IS SIMPLY MINDBLOWING!
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ
Very nice video except for one thing. You don't always need a defibrilator. Not every cardiac arrest is caused by ventricular fibrilation or pulsless ventricular tachicardia. Ventricular fibrilation and pulsless ventricular tachicardia are shockable rhythms and you need a defibrilator when you see one. But some cardiac arrest victims have pulsless electric activity or asystole. These two are called non-shockable rhythms and as the name implies, you can't (shouldn't) try to defibrilate those. So, you don't always need a defibrilator.
I was getting ready to make the same comment. I wish they had clarified this common assumption. He did acknowledge that there were misconceptions, but didn't address what was wrong.
alyssa2123 Exactly! I was waiting the whole episode for Hank to say that you can't shock a flatline, and that fibrilation doesn't show like a flatline on the monitor. We should inform Hank or the writers of this because it's just so wrong.
Thank you very much Crash Course for teaching me physiological systems when my instructor fails to do so! My kids are watching the kids channel too and they love it! Keep up the GREAT work!
I've been trying to study the heart by looking on wikipedia and memorising parts of the heart, and then I watch two videos and know how the heart pretty much works, lol. Very good videos, thank you.
This is fascinating! If the SA node controls the pace of your heart, how does your brain make it go faster or slower? Maybe by changing the environment at the node so it depolarizes faster or slower? And if the SA node controls the AV node, what does it mean for the AV node to have its own rhythm? I suppose I'll trawl Wikipedia from here. So many questions!
Loved the spoiler xD Watch out Hank. People who watch Grey's anatomy aren't normally associated with emotional stability! Break out the torches and pitchforks folks!
tomorrow is my term exam, I am banging my head to the wall because i didn't find this brilliant channel earlier, Thank you so much for all this, you set my mood to harmony!
Thanks a lot to the whole CrashCourse crew, without your wonderful free education, we would've had to pay tons of money to private teachers to get a little knowledge.
These heart videos are NEARLY PERFECT!!!! I just wish that the right ventricle was visibly smaller than the left!! they both look equally strong, i might even say the right is just barely bigger than the left which is wrong, but yea no shade, I love crash course!
God bless my dude hahaa i have an exam today and i needed to crash course this unit. i know most of the material but i didn't get to study study bc life happened..so this is really helping me before my exam!
It sounds like the pacemaker cells' activity is extremely constant, fibrillation notwithstanding. But what controls the normal and perfectly healthy fluctuations in heart rate that we see, for instance, between strenuous exercise and rest?
aperson22222 Pacemaker cells actually have very organized activity that can depolarize automatically based on their membrane potentials. There are various calcium, sodium, and potassium channels that help maintain the gradients. As Chris Snow said, the rates can be modified by the parasympathetic and sympathetic nervous systems. For example: adrenaline increases conductance of sodium and potassium across the membrane thus increasing the slopes of the various phases of depolarization and leading to a faster heart rate. This is really a cool area to study.
As health care provider I can say cpr with out a AED ( defibrillator) is like only having one chop stick you need both. But if you need to perform cpr push hard and fast till help can come.
