Would be really useful to have a video explaining oxygen concentrations, flow rates, entrainment, and the various oxygen delivery devices, etc. Seems like a basic topic to know how much oxygen you're giving but I still haven't found a good way to truly understand it :S
@@ICUAdvantage Thanks! Once I read about how a patient's own peak inspiratory flow rate affects the FiO2 they take in (i.e. 15L of '100% O2' versus the actual FiO2 for the patient depending on whether they're at rest or with increased work of breathing), I realised there was more to understanding the topic than I'd learned about in medical school
Another question: cardiac index isn't used often within my field, and thus it doesn't make sense to me. I would See two population-matched people, (say two males both at 230 pounds and 45 years old) but one has a body fat percentage of 12% and the other has 38%. What I gathered from your presentation about CI is there were no morphological differences since it merely accounts for mass alone; not muscle quality and vascularization.
Its body surface area that is derived from height and weight and then used for the calculation. It isn't perfect, but less prone to variances such as these and better adapted towards a common value scale.
Some sources use 1.34 and some use 1.39 from what I've found. Ultimately though they numbers are very close and give the same picture of the greater importance of the Hgb and saturation in the overall calculation.
