Clinical Approach to Assessing Acid-Base Status: Physiological vs Stewart.

Area of Science:

• Physiology
• Biochemistry
• Medical Diagnostics

Background:

• Accurate assessment of acid-base status is crucial for patient care.
• Three main approaches exist: physiological, base excess, and physicochemical (Stewart).
• This review focuses on the physiological and Stewart approaches.

Purpose of the Study:

• To compare the conceptual frameworks of the physiological and Stewart approaches to acid-base assessment.
• To examine the practical applications, advantages, and disadvantages of each method.
• To offer a perspective on the optimal approach for evaluating acid-base status.

Main Methods:

• Comparative analysis of the physiological (traditional) and physicochemical (Stewart) approaches.
• Review of the underlying principles, independent variables, and buffer systems considered.
• Examination of clinical utility and limitations of each method.

Main Results:

• The physiological approach relies on the Henderson-Hasselbalch equation and focuses on the bicarbonate buffer system.
• Stewart's approach utilizes three independent variables: strong ion difference, total weak acid concentration, and PCO2.
• Both approaches have distinct conceptual underpinnings and clinical applications.

Conclusions:

• Understanding the differences between the physiological and Stewart approaches is essential for accurate acid-base interpretation.
• The physicochemical approach offers a more comprehensive framework by considering all strong ions and weak acids.
• The optimal approach depends on the clinical context and the specific acid-base disturbance being evaluated.