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Interpretation of arterial blood gas

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Author(s): Sood Pramod | Paul Gunchan | Puri Sandeep

Journal: Indian Journal of Critical Care Medicine
ISSN 0972-5229

Volume: 14;
Issue: 2;
Start page: 57;
Date: 2010;
Original page

Keywords: Arterial blood gas interpretation | ABG analysis | rules for rapid ABG analysis | Anion gap | Approach to mixed disorders

ABSTRACT
Disorders of acid-base balance can lead to severe complications in many disease states, and occasionally the abnormality may be so severe as to become a life-threatening risk factor. The process of analysis and monitoring of arterial blood gas (ABG) is an essential part of diagnosing and managing the oxygenation status and acid-base balance of the high-risk patients, as well as in the care of critically ill patients in the Intensive Care Unit. Since both areas manifest sudden and life-threatening changes in all the systems concerned, a thorough understanding of acid-base balance is mandatory for any physician, and the anesthesiologist is no exception. However, the understanding of ABGs and their interpretation can sometimes be very confusing and also an arduous task. Many methods do exist in literature to guide the interpretation of the ABGs. The discussion in this article does not include all those methods, such as analysis of base excess or Stewart′s strong ion difference, but a logical and systematic approach is presented to enable us to make a much easier interpretation through them. The proper application of the concepts of acid-base balance will help the healthcare provider not only to follow the progress of a patient, but also to evaluate the effectiveness of care being provided.

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