Simple as ABG

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Simple as ABG by Larry Romane

I normally don't like to read e-versions, I prefer books but this one works well electronically. One person found this helpful. Really enjoyed reading this, very straightforward and easy to digest mentally. I'm a senior pediatrics resident and I found this book very useful to not only solidify basic concepts of ABG but also to identify wonderful teaching pearls for medical students and interns.

  1. Arterial blood gas measurements?
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A very quick read if you're already familiar with blood gases. Helpful reference, puts information in easy to understand terms. Short and well founded. Direct, with constant rational approach and common sense from practical bedside experience. Really useful, easy to read guide to ABGs!

Simple as ABG

All the examples were easily explained. Could have used a conversion table for kPa though! See all 41 reviews.

Most recent customer reviews. Published 4 months ago.

Interpreting ABGs

However, this is not the case. Do you believe that this item violates a copyright? Yes, normal HCO 3- is between Ali Moh'd rated it it was amazing Jan 09, Overend rated it really liked it Dec 25, On acute medical take, ABGs are used to determine the nature as well as the severity of a problem.

Published 8 months ago. Published 10 months ago. Case studies were interesting. Published 1 year ago.

Simple Method to Handle Acid/Base (ABG) Questions.

Published on July 30, Amazon Giveaway allows you to run promotional giveaways in order to create buzz, reward your audience, and attract new followers and customers. Learn more about Amazon Giveaway. An abnormal pH means there has to be an acute component to the problem. It is sometimes thought that type 2 respiratory failure is simply a more severe version of type 1.

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However, this is not the case. Type 1 and type 2 respiratory failures are due to entirely different mechanisms. Type 2 respiratory failure is extremely an issue of ventilation, that is, the business of pumping air in and out of the lungs. When underventilation occurs, for what ever reason eg muscular weakness or opiate overdose , the P a CO 2 will increase the definition of underventilation and P a O2 must decrease even if the lungs are perfectly healthy.

Type 2 respiratory failure results from underventilation, which can occur even in the context of healthy lungs. In such circumstances, oxygen delivered to the lungs by ventilation is handled inefficiently and P a O 2 falls. However, provided that overall ventilation is normal, P a CO 2 is maintained. When P a O 2 is low yet P a CO 2 normal, type 1 respiratory failure is present, and such a result implies lung or pulmonary -vascular disease.

Respiratory and metabolic systems – in balance

Type 1 and type 2 respiratory failure can occur simultaneously. Indeed, the combination is common in severe chronic obstructive pulmonary disease, for example. Given that the two conditions result from entirely different mechanisms, with implications for treatment, one should be able to distinguish between them. When the only derangement is P a O 2 , clearly the failure is type 1. However, when the P a CO 2 is high, one has to work out whether the low P a O 2 can be accounted for by underventilation alone or whether there is an additional type 1 problem ie whether there is anything wrong with the lungs.

To do this, one needs to measure the alveolar—arterial gradient, that is, the difference between the alveolar partial pressure of oxygen P A O 2 and the P a O 2. In healthy young adults, the difference should be less than 2 kPa. If the patient is older, breathing higher concentrations of O 2 or over ventilating, then the gap can widen, although in healthy patients this would not usually be expected to be greater than 4 kPa.

If the alveolar—arterial gradient is higher than it should be, then a type 1 respiratory failure is present. ABG interpretation is not difficult. Break down the task into steps and do them in order.

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For a more detailed review of arterial blood gas interpretation, see Ref 1. Box 1 provides an example of a patient presenting with breathlessness, where ABGs form an important diagnostic test. User Name Password Sign In. Key points Most doctors struggle with arterial blood gas ABG interpretation ABG interpretation is easy Break it down into steps The first priority for the respiratory system is pH If partial pressure of carbon dioxide pCO2 goes down, partial pressure of oxygen pO2 should go up. A common way these values are given in practice is like this:.

Some questions may simply just give you the three values much easier. Calculating is really simple.

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Just commit to memory that you start with sodium Na , then subtract chloride Cl , followed by also subtracting bicarbonate HCO3. I doubt this concept will be included in a question since these are technically two different types of questions. However, at least you are prepared in the event that it is asked to calculate both or integrate both. Did you find this post helpful? Perhaps even insightful or game changing?

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