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Hi @ctguboy, I'm glad the video was of some use to you! And very happy to be corrected about my misunderstandings of foetal anatomy. Thank you so much :)

Hi Jennifer, great question! I'm not a neonatologist, so it is best to check these kinds of questions with your clinical supervisor. However, to the best of my understanding, it is not advisable to use a foot probe in the setting of a newborn resuscitation. This is because both of baby's feet will be perfused by the left and right femoral arteries, which are situated distally to the ductus arteriosus. This means that for a newborn baby that is just a few minutes old, an SpO2 reading taken off the foot will be markedly lower than their cerebral oxygen saturation. Thus if we were to titrate oxygen therapy to a foot probe reading, we could run the risk of oxygen toxicity for the baby. There are however some instances you would use a foot probe. One reason is for oximetry screening of congenital heart defects, which is usually performed between 4-48 hours after birth. In this scenario, a pulse oximetry reading would be taken off the right hand (pre-ductal) and either foot (post-ductal). In most healthy babies, the foetal shunts close within 12-48 hours of life. Thus if the baby has a structurally normal heart, the pre-ductal and post-ductal reading should be the same after 48 hours. However if there is a disparity of >5%, this could be a sign of right-to-left shunting, such as which occurs in Tetralogy of Fallot. By that token, a foot probe can also be used for routine SpO2 monitoring in neonates who are at least a couple of days old. Remember that the foetal shunts usually close within 48 hours of birth. Thus, it theoretically shouldn't matter which limb you choose to take an SpO2 reading from as they should all be the same in this instance. If you are asked to take a foot probe reading as a birth assistant, I dare say it shouldn't matter which foot you choose. I hope this helps :) please check this over with your clinical supervisor before integrating it into your practice.

@@sherlynhii4382 Thank you so much! I will check in with my supervisor 😉

That's awesome Bellacat9. I'm exactly the same!

Good luck on your exam Atiya!

@@sherlynhii4382 thank you <3

Thank you Matias. That is high praise coming from a clearly capable clinician :)

Thank you Mr Picknell! It is an honour to have your seal of approval :)

Hey thanks for the tip helicart. I will check that out. Do you have any good source material that you'd recommend?

@@sherlynhii4382 I just wrote a reply with references, but youtube's algo appears to be aggressively censorious these days....and my reply seems to have vanished. I will send again in the next few days if it doesn't show up...

@@sherlynhii4382 A little long winded but the boys have done a good job here. ruclips.net/video/vSrW4jg8Zq8/видео.html

Hey Alexa, that is a great question! I'm not really sure but if I were a betting gal, I'd say that they have made 6 o'clock position 90 degrees because it makes more sense to refer to the normal cardiac axis starting at point zero. In a normal heart, the pattern of depolarisation follows a roughly south-easternly direction as the impulse travels from the sino-atrial node, towards the purjinke fibres. Because this is the default range, it is simpler to say that true east is 0° and true south is 90°. Interestingly I have not seen a version of the cardiac axis which describes the 12 o'clock position as positive 90° and 6 o'clock position as negative 90°. Where had you seen that? Sorry I couldn't offer up a better answer. I hope that was kind of useful. If anyone else has any ideas I'd be keen to hear also.

According to my understanding. We took a perpendicular line to map out cardiac axis and for that any perpendicular line will be 0 degree at the right. So yeah up right will be -90 and below is +90.

@@sherlynhii4382 Hello! I don't know why RUclips works so bad, because only now that you hearted my comment I got a notification for your reply. Thank you for trying to explain. Well, in my physiology class, our teacher drew those 90, -90 degrees (like you also did here) but my question was more towards the idea, why are the degrees not switched like in math, where if you go anti clock wise, starting from 0, the top 90, would be positive. I know I asked the reason for that, but even then I couldn't understand why it is like that.