Acid-Base Balance and Imbalance in Body Fluids

Acid-Base Balance is crucial for maintaining proper pH levels in body fluids, with normal blood pH ranging from 7.35 to 7.45. Imbalances are categorized into respiratory or metabolic types, each with distinct causes and effects on pH, CO2, and bicarbonate (HCO3) levels. Respiratory acidosis results from CO2 retention due to conditions like COPD or hypoventilation, causing low pH and high CO2. Respiratory alkalosis is caused by hyperventilation, leading to high pH and low CO2. Metabolic acidosis arises from causes such as kidney failure, diarrhea, or diabetic ketoacidosis, exhibiting low pH and low HCO3. Metabolic alkalosis, often due to vomiting or excessive antacid use, manifests as high pH and high HCO3. Common symptoms across acid-base imbalances include confusion, fatigue, shortness of breath, and irregular heartbeat. For arterial blood gas (ABG) interpretation, the ROME method aids in distinguishing respiratory versus metabolic conditions: Respiratory effects show pH and CO2 changes in opposite directions, whereas Metabolic effects show changes in the same direction. This framework assists clinicians in identifying the underlying cause and implementing appropriate interventions.