Primary Concepts provides teaching videos focused on basic science knowledge required for the FRCA exam. These videos are a good introduction to key concepts for candidates preparing for the Primary FRCA, and a useful revision aid to recap the topics before sitting the Final.
Nitrogen is present throughout lungs during the respiratory cycle (assuming the patient is breathing air). At the start of the test, a single breath of 100% oxygen is taken. When the patient starts to exhale, it will be gas from the anatomical dead space which leaves first. This hasn't mixed with any of the existing gas within the lungs (by definition) and so contains no nitrogen. As exhalation continues, we begin to see a contribution from the non-dead space volume. This contains nitrogen from breathing air BEFORE the single breath of 100% oxygen was taken. Hope that helps
This is the best video explaining the equation, thanks so much for your job. I just have one question where did you get this derivation from? I've been looking for papers and textbooks trying to explain this but with no results. I was wondering if you have some resourses about this topic, specificly explaining the derivation of the equation
Glad it was helpful. Here is an excellent paper from Cruickshank describing principles behind the derivation: watermark.silverchair.com/mkh008.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAA00wggNJBgkqhkiG9w0BBwagggM6MIIDNgIBADCCAy8GCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQMZZBgGfeKmar8i9pRAgEQgIIDACcOfX6UtI25NCaqnQvS9vt0cIHB47suZO9jF7tUpnP12KmN-SG8_IgkuV9GwC82UmVhx0XQCYUh6FcW5khheI3sy_SXkyeIOyOIDdLeFfoOMvqyNmCQUVR69ZFJ5TXlXM3auXO52kK9zhXJdPJsdmQZSSqNWimyPk1GwwW47MH9fCHy7WegMrZqtHtB9clW5ldItRIgHh-hFlJxAoUqQuFplGXsPcmoJJPDX6SpWKd_aHayWxrZD4LjBmnUlPotZYIxCRgtnGk5u-gHwIs21WN-Hobpi2ds670Ad8TO9gLWx30g7OhDu9kgnxk9JsFY0um9EWCaQ6UoT7KASXxFyP1V5M0lriOjtjDn7t4HnILxlxJQsUhqXbkowxWpwjj4T6902weFtoe_KB5WH0c-RdPQh42N5aPZ6-4Q_ILVVblsqn6Cev9qPyJ_JgnUh7weKet6jfNb0DHQC48y29kffh5kvbRu9Ijd-tqJsWsruus04b4gIDANSnKWyHlCWW1i4L0yObIx60qPICyc1jWHKg5oafzdPS3vaxaDTC9XDw34WiH3OojN3K5jAQgRfs2tzCp8kLofTVvSON7zrbbpZZ1jdK3IOmYITa8ojf53LnUMZJeRH8LVRU8Fca1kMELwKqQI6DJKw3LwC3GOeYgD-aeya4ejiZWYQwZT8y1fqj0N3PJWvDE3pbmBQJxXnjgWKJp8aIfK2ycMyUctwZOTa0-T3dgSYPZLFh80aAP1wpCooSPDisute0PvsJcmTrtNnO9c0Acq85U0pMoZmJIJvQSWkr6I_vByBWGike_2oYWSIyOdInUEPr2l_5hRlngD7rpN5keEA4BLfQL_gjJbFuSkp7C-1hYnT2Y8XzMZ3sH3AVAKyOdE78KV1vjMeYRjYRP6AxOIkmtQCdnbsDt5jAh80-SyYUbmNHBvU0zlOx0Tn1_ATgL5sVcIUzYpMWqTIx0VV7PGOxAqcCpzpOhWOfVGffqESgRWU5oi18Dr_jAm7mmzk8sHDlzuyu3eqWRtHQ
Great video! Many thanks for that! I am currently working my way through West's Respiratory Physiology followed by Pathophysiology as an anesthesia resident and am really impressed with the didactic clarity. Do you know of any comparable works for cardiovascular physiology and pathophysiology? Best regards from Germany!
This is a wonderful book by Chambers which formed the basis of my revision for the FRCA. www.cambridgebookshop.co.uk/products/basic-physiology-for-anaesthetists?variant=42184468857071¤cy=GBP&gad_source=1
Thank you ever so much for sharing your channel and knowledge. A really interesting and well broken down video. I found the use of colour for different parts really helped too to keep up with what you were saying. Thank you 😊 I'm definitely on a mission to watch the rest of your videos. Thank you.
Omg thank you so much for this wonderful explanation! I find this eqn a bit easier to understand intuitively if I see it as basically a version of Boyle's Law (P1V1 = P2V2) comparing the end-inspiration and end-expiration states. The pre-post and derivation slides in this vid help make this clearer.
Thanks very much for the great explanation. A question though - when explaining how t1/2 and time constants are related, how did you go from ln(1/2) to -ln2?
You're welcome. The terms In(1/2) and -In2 are equivalent. It's because of the quotient rule: ln(a/b) = In(a) - In(b) In this case, a is 1 and b is 2 So In(1/2) = In1 - In2 Since In1 = 0, you're just left with -In2. Hope that helps.
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