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.
Summary
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.
| Acid-Base Type | pH Change | Key Ion Change | Common Causes |
|---|---|---|---|
| Respiratory Acidosis | Decrease | CO2 increase | COPD, Hypoventilation |
| Respiratory Alkalosis | Increase | CO2 decrease | Hyperventilation |
| Metabolic Acidosis | Decrease | HCO3 decrease | Kidney failure, Diarrhea, DKA |
🧠 Key Concepts
- normal blood pH range
- respiratory acidosis causes
- respiratory alkalosis causes
- metabolic acidosis causes
- metabolic alkalosis causes
- common symptoms of imbalance
- ABG interpretation
- ROME method
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Full Notes
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Acid-Base Balance refers to the regulation of pH in the body fluids.
Normal blood pH: 7.35 - 7.45
Types of Acid-Base Imbalance:
1. Respiratory Acidosis Cause: CO2 retention (e.g., COPD, hypoventilation) pH: Low CO2: High
2. Respiratory Alkalosis Cause: Hyperventilation pH: High CO2: Low
3. Metabolic Acidosis Cause: Kidney failure, diarrhea, diabetic ketoacidosis pH: Low HCO3: Low
4. Metabolic Alkalosis Cause: Vomiting, excessive antacid intake pH: High HCO3: High
Common Symptoms: - Confusion - Fatigue - Shortness of breath - Irregular heartbeat
ABG Interpretation Tip: ROME Method: Respiratory Opposite Metabolic Equal
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