Based on the underlying causative mechanism, acid-base disturbances are divided into one of four categories. In this course, we teach you a simple method to recognise and categorize acid-base disturbances detected on the arterial blood gas (ABG). We explain the meaning of the terminology used in this field. We explain the definition of ‘metabolic’ acid-base disturbances and ‘respiratory’ acid-base disturbances. We teach you how to distinguish between metabolic and respiratory pH disorders. In the quiz, we give you the opportunity to apply what you have learned to clinical cases. In recent years, the venous blood gas (VBG) has emerged as a useful alternative to the ABG in the management of metabolic disorders. We teach you how values relevant to pH disturbances reported on a VBG compare to values measured on an ABG.
Planner and Author: Dr John Seery MB PhD
Planner: Dr Karen Strahan PhD (University of Cambridge), Head of Editorial
Planner: Tommy O'Sullivan, CME Manager
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Seery JP and Ryan J. 10 Things You Need to Know about Arterial Blood Gas (ABG): Identifying Simple pH Disturbances.
Seery JP and Ryan J. How to Read a Venous Blood Gas.
Menchine M et al. Diagnostic Accuracy of Venous Blood Gas Electrolytes in the Emergency Department. Acad Emerg Med. 2011;18:1105-8.
Rutledge TE. Acid-base disturbances in the emergency department. Part 1: Piecing the clues together. Can Fam Physician. 1991. 37:2254 – 8.
Leader DP. A method of introducing the physiological carbon-dioxide bicarbonate buffer system to medical students. Biochem Edu. 1979;7(2):37-8.
Hills AG. pH and the Henderson-Hasselbach Equation. Am J Med. 1973;55:131-133.
Hamilton PK et al. Understanding Acid-base Disorders. Ulster Med J. 2017;86(3):161-6.
Acadoodle, Ltd is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide continuing medical education for physicians.
Acadoodle, Ltd designates this enduring material activity for a maximum of 1.0 AMA PRA Category 1 Credits™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.