Acid-Base Imbalances
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A patient is admitted with acute respiratory acidosis. Which of the following arterial blood gas (ABG) values would the nurse expect?

  • pH 7.48, PaCO2 37 mmHg, HCO3 30 mEq/L
  • pH 7.30, PaCO2 50 mmHg, HCO3 24 mEq/L (correct)
  • pH 7.40, PaCO2 45 mmHg, HCO3 26 mEq/L
  • pH 7.50, PaCO2 30 mmHg, HCO3 22 mEq/L

A nurse is caring for a patient experiencing metabolic alkalosis. Which condition is most likely the cause?

  • Prolonged vomiting (correct)
  • Acute renal failure
  • Diabetic ketoacidosis (DKA)
  • Chronic obstructive pulmonary disease (COPD)

Which clinical manifestation is most commonly associated with respiratory alkalosis?

  • Tingling of fingers and toes (correct)
  • Bradycardia
  • Kussmaul respirations
  • Hypotension

A patient with metabolic acidosis due to diabetic ketoacidosis is experiencing Kussmaul respirations. What is the primary reason for this respiratory pattern?

<p>The body is attempting to compensate by decreasing CO2 levels (D)</p> Signup and view all the answers

Which of the following interventions is the priority for a patient experiencing respiratory acidosis?

<p>Assist with mechanical ventilation if needed (A)</p> Signup and view all the answers

A patient with metabolic acidosis may exhibit which of the following signs and symptoms? (Select all that apply.)

<p>Hypotension (B), Kussmaul respirations (C), Confusion (D), Nausea and vomiting (E)</p> Signup and view all the answers

Which of the following can cause respiratory alkalosis? (Select all that apply.)

<p>Mechanical ventilation set too high (A), Pulmonary embolism (B), Anxiety (C), Aspirin overdose (E)</p> Signup and view all the answers

The nurse is assessing a patient with respiratory acidosis. Which findings are expected? (Select all that apply.)

<p>Hyperkalemia (A), Increased CO2 retention (B), Shallow, slow respirations (C), Confusion (E)</p> Signup and view all the answers

Which laboratory values are consistent with metabolic alkalosis? (Select all that apply.)

<p>HCO3 30 mEq/L (A), PaCO2 48 mmHg (B), pH 7.48 (D)</p> Signup and view all the answers

A nurse is teaching a patient about acid-base balance. Which statements are true? (Select all that apply.)

<p>The lungs help regulate CO2 levels (B), Compensation by the lungs occurs immediately (C), The kidneys help regulate bicarbonate levels (D), Metabolic alkalosis is often caused by prolonged vomiting (E)</p> Signup and view all the answers

A patient presents with an arterial blood gas (ABG) result of pH 7.32, PaCO2 50 mmHg, HCO3 25 mEq/L. What is the most likely cause of this imbalance?

<p>Pneumonia with hypoventilation (A)</p> Signup and view all the answers

Which patient is at the highest risk for developing metabolic acidosis?

<p>A patient with severe diarrhea for three days (D)</p> Signup and view all the answers

A nurse reviews a patient's ABG values: pH 7.50, PaCO2 30 mmHg, HCO3 24 mEq/L. What condition is present?

<p>Uncompensated respiratory alkalosis (B)</p> Signup and view all the answers

A patient is experiencing metabolic alkalosis. Which of the following interventions is appropriate?

<p>Discontinue nasogastric suctioning if applicable (A)</p> Signup and view all the answers

A nurse is teaching a patient with chronic kidney disease about metabolic acidosis. Which statement by the patient indicates understanding?

<p>&quot;This condition is caused by my kidneys not removing enough acid.&quot; (D)</p> Signup and view all the answers

Which ABG result is indicative of fully compensated respiratory acidosis?

<p>pH 7.37, PaCO2 48 mmHg, HCO3 30 mEq/L (C)</p> Signup and view all the answers

A patient is admitted with respiratory alkalosis. What should the nurse do first?

<p>Instruct the patient to breathe into a paper bag (A)</p> Signup and view all the answers

Which electrolyte imbalance is most commonly associated with metabolic alkalosis?

<p>Hypokalemia (A)</p> Signup and view all the answers

Which of the following is a primary cause of respiratory acidosis?

<p>Airway obstruction (C)</p> Signup and view all the answers

A nurse notes an ABG result of pH 7.48, PaCO2 38 mmHg, HCO3 30 mEq/L. What is the likely cause?

<p>Vomiting (B)</p> Signup and view all the answers

Which patients are at risk for metabolic acidosis? (Select all that apply.)

<p>A patient with severe diarrhea (A), A patient with kidney failure (B), A patient with salicylate overdose (E)</p> Signup and view all the answers

A nurse is assessing a patient with respiratory alkalosis. Which symptoms may be present? (Select all that apply.)

<p>Hyperventilation (A), Numbness and tingling in extremities (B), Lightheadedness (D), Muscle cramps (E)</p> Signup and view all the answers

A nurse is caring for a patient in metabolic acidosis. Which interventions are appropriate? (Select all that apply.)

<p>Administer insulin for diabetic ketoacidosis (B), Administer IV bicarbonate as ordered (C), Monitor ABG levels (D), Monitor serum potassium levels (E)</p> Signup and view all the answers

A patient with metabolic alkalosis may experience which clinical manifestations? (Select all that apply.)

<p>Slow, shallow respirations (B), Irritability (C), Tetany (D)</p> Signup and view all the answers

A nurse is analyzing ABG results. Which findings indicate respiratory acidosis? (Select all that apply.)

<p>PaCO2 50 mmHg (A), pH 7.31 (C)</p> Signup and view all the answers

Flashcards

Respiratory Acidosis ABG

Low pH, high PaCO2

Metabolic Alkalosis ABG

High pH, high HCO3

Respiratory Alkalosis Symptom

Tingling, numbness due to decreased calcium from hyperventilation.

Kussmaul Respirations

Deep, rapid breaths to expel CO2.

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Respiratory Acidosis Priority

Improve ventilation to remove excess CO2.

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Kussmaul Respirations in Acidosis

Deep, rapid breaths indicating the body is trying to compensate for Metabolic Acidosis

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Causes of Respiratory Alkalosis

Anxiety, aspirin overdose, too much mechanical ventilation, and pulmonary embolism.

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Findings in Respiratory Acidosis

Shallow, slow respirations, hyperkalemia, confusion, increased CO2 retention

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Lab Values of Metabolic Alkalosis

pH above 7.45 & HCO3 above 26

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Lung Compensation

Immediate compensation by the lungs that quickly regulate CO2.

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Cause of Low pH/High PaCO2

Pneumonia with hypoventilation

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Risk for Metabolic Acidosis

Severe diarrhea.

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Uncompensated Resp. Alkalosis

High pH, low PaCO2, normal HCO3

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Metabolic Alkalosis Intervention

Stop removing acid from the body. (ex. Nasogastric suctioning)

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Kidney Disease and Acidosis

Kidneys are not removing enough acid.

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Compensated Respiratory Acidosis

pH normal, PaCO2 high, and HCO3 high.

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Respiratory Alkalosis Action

Breathe into a paper bag.

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Electrolyte and Metabolic Alkalosis

Low potassium levels

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Primary Cause of Respiratory Acidosis

Airway obstruction

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Vomiting and Alkalosis

Loss of gastric acid

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Risk of Metabolic Acidosis

Kidney failure, overdose, severe diarrhea.

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Respiratory Alkalosis Symptoms

Excessive CO2 loss

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Metabolic Acidosis Interventions

Monitor, bicarbonate, insulin for DKA, potassium levels.

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Metabolic Alkalosis Clinical Manifestations

Irritability, tetany, slow shallow breathing.

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Respiratory Acidosis Indicators

Retention of CO2

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Metabolic Acidosis ABG

Decreased bicarbonate levels, increased acid level

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Metabolic Alkalosis ABG

Elevated bicarbonate levels, decreased acid level

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Acid-Base Balance

The maintenance of the body's pH within a narrow range.

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Buffers

Chemical systems set up to resist changes in pH.

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Buffer Ratio

The ratio of bicarbonate to carbonic acid to achieve normal pH.

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Study Notes

  • Respiratory acidosis results from hypoventilation, leading to CO2 retention, and is indicated by low pH and high PaCO2 levels.

  • Prolonged vomiting leads to excessive loss of hydrochloric acid, increasing bicarbonate and pH, resulting in metabolic alkalosis.

  • Respiratory alkalosis is commonly associated with tingling and numbness in the fingers and toes, caused by hypocalcemia due to hyperventilation.

  • Kussmaul respirations are the body's attempt to decrease CO2 levels to increase pH and compensate for metabolic acidosis in diabetic ketoacidosis.

  • The priority intervention for respiratory acidosis is assisting with mechanical ventilation to remove excess CO2, addressing the hypoventilation issue.

  • Metabolic acidosis can manifest as Kussmaul respirations, confusion, hypotension, and gastrointestinal symptoms like nausea and vomiting.

  • Respiratory alkalosis can be caused by hyperventilation due to anxiety, aspirin toxicity, pulmonary embolism, and excessive mechanical ventilation.

  • Findings expected in respiratory acidosis include shallow, slow respirations, hyperkalemia, increased CO2 retention, and confusion.

  • Metabolic alkalosis presents with an elevated pH and increased bicarbonate, with PaCO2 possibly elevated as the lungs compensate.

  • The lungs regulate CO2 levels and compensate quickly, while the kidneys regulate bicarbonate and compensate more slowly in acid-base balance.

  • A low pH and elevated PaCO2 indicate respiratory acidosis, potentially caused by hypoventilation from pneumonia, COPD, or drug overdose.

  • Severe diarrhea results in excessive bicarbonate loss, which could lead to metabolic acidosis.

  • High pH and low PaCO2 readings indicate respiratory alkalosis.

  • Nasogastric suctioning can cause excessive acid loss, contributing to metabolic alkalosis; discontinuing it can help correct this imbalance.

  • In chronic kidney disease, the kidneys' failure to excrete hydrogen ions leads to metabolic acidosis.

  • Fully compensated respiratory acidosis is indicated by pH within the normal range (7.35-7.45), along with high PaCO2 and elevated HCO3.

  • Breathing into a paper bag helps retain CO2, correcting respiratory alkalosis caused by hyperventilation.

  • Metabolic alkalosis often leads to hypokalemia because potassium shifts into cells in exchange for hydrogen ions.

  • Airway obstruction leads to CO2 retention, causing respiratory acidosis.

  • Vomiting leads to loss of gastric acid, resulting in metabolic alkalosis.

  • Patients at risk for metabolic acidosis include those with kidney failure, salicylate overdose, and severe diarrhea, kidney failure leads to acid retention, salicylate overdose causes acidosis, and severe diarrhea leads to bicarbonate loss. Vomiting and hyperventilation contribute to alkalosis.

  • Symptoms of respiratory alkalosis may include hyperventilation, lightheadedness, muscle cramps, and numbness/tingling in extremities.

  • Appropriate interventions for metabolic acidosis include monitoring ABG levels, administering IV bicarbonate, administering insulin for diabetic ketoacidosis, and monitoring serum potassium levels.

  • Clinical manifestations of metabolic alkalosis include neuromuscular excitability (tetany, irritability) and hypoventilation as compensation.

  • Findings that indicate respiratory acidosis include low pH and elevated PaCO2.

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Description

Summary of acid-base imbalances: respiratory acidosis from hypoventilation, metabolic alkalosis from vomiting, and respiratory alkalosis from hyperventilation. Kussmaul respirations indicate metabolic acidosis. Focus on interventions and symptoms.

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