Textbook Question
Mary, a nursing student, has been caring for burn patients. She notices that they consistently show elevated levels of potassium in their urine and wonders why. What would you tell her?
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Ch. 27 Fluids & Electrolytes
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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Table of contents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Not the one you use?Change textbook
Chapter 26, Problem 31
Refer to the diagnostic flowchart in Spotlight Figure 27–18. Use information from the blood test results in the accompanying table to categorize the suspected acid-base disorders of the patients represented in the table.
Verified step by step guidance1
Step 1: Understand the key parameters involved in acid-base disorders, typically including blood pH, partial pressure of carbon dioxide (pCO\_2), and bicarbonate ion concentration (HCO\_3\^-). These values help determine whether the disorder is respiratory or metabolic and whether it is acidosis or alkalosis.
Step 2: For each patient, examine the blood pH value to determine if the patient is acidotic (pH < 7.35), alkalotic (pH > 7.45), or within the normal range (7.35–7.45). This is the primary indicator of acid-base status.
Step 3: Analyze the pCO\_2 value to assess respiratory contribution. An elevated pCO\_2 suggests respiratory acidosis, while a decreased pCO\_2 suggests respiratory alkalosis. Compare this with the pH to see if the respiratory component aligns with the acid-base disturbance.
Step 4: Examine the HCO\_3\^- concentration to evaluate the metabolic component. A decreased HCO\_3\^- indicates metabolic acidosis, while an increased HCO\_3\^- indicates metabolic alkalosis. Again, compare this with the pH to confirm the metabolic disturbance.
Step 5: Use the diagnostic flowchart to integrate these values: start with pH to identify acidosis or alkalosis, then determine if the primary cause is respiratory or metabolic by comparing pCO\_2 and HCO\_3\^- levels. Finally, check for compensation by seeing if the non-primary parameter is changing in the opposite direction to partially correct the pH.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Base Balance and Disorders
Acid-base balance refers to the maintenance of the proper pH in the blood, typically between 7.35 and 7.45. Disorders occur when this balance is disrupted, leading to acidosis (low pH) or alkalosis (high pH). Understanding the causes and effects of these imbalances is essential for diagnosing related conditions.
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Interpretation of Blood Gas Results
Blood gas analysis measures pH, partial pressure of carbon dioxide (pCO2), and bicarbonate (HCO3-) levels. These values help determine whether an acid-base disorder is respiratory or metabolic in origin and whether it is compensated or uncompensated. Accurate interpretation is key to categorizing the disorder.
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Use of Diagnostic Flowcharts in Clinical Assessment
Diagnostic flowcharts guide clinicians through systematic steps to analyze blood test results and identify acid-base disorders. They help integrate multiple parameters, such as pH, pCO2, and HCO3-, to reach a clear diagnosis. Familiarity with these tools improves diagnostic accuracy and decision-making.
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Related Practice
Textbook Question
Yuka is dehydrated, so her physician prescribes intravenous fluids. The attending nurse becomes distracted and erroneously gives Yuka a hypertonic glucose solution instead of normal saline. What effect will this mistake have on Yuka’s plasma ADH levels and urine volume?
Textbook Question
While visiting a foreign country, Milly inadvertently drinks some water, even though she had been advised not to. She contracts an intestinal disease that causes severe diarrhea. How would you expect her condition to affect her blood pH, urine pH, and pattern of ventilation?
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