1. DKA, renal failure, and Kussmaul respirations → Metabolic acidosis
📘 Diabetic ketoacidosis produces excess acidic ketones, which lowers serum bicarbonate and blood pH.
📘 Renal failure also causes acid retention because the kidneys cannot adequately excrete hydrogen ions.
📘 Kussmaul respirations are deep, rapid breaths used to eliminate carbon dioxide as respiratory compensation.
📘 The expected pattern is a low pH, low HCO₃⁻, and a compensatory low PaCO₂.
📘 The primary abnormality is the loss of bicarbonate or accumulation of metabolic acids.
📘 Compensation may be partial if the pH remains below normal.
📘 This pattern requires treatment of the underlying cause rather than correction of respiration alone.
📘 These findings are therefore most consistent with metabolic acidosis.
2. Panic attack with rapid breathing → Respiratory alkalosis
📘 A respiratory rate of 42 breaths/minute indicates marked hyperventilation.
📘 Hyperventilation causes excessive elimination of carbon dioxide from the lungs.
📘 Because carbon dioxide acts as an acid, a decreased PaCO₂ raises the blood pH.
📘 Dizziness and tingling are common manifestations of acute respiratory alkalosis.
📘 The expected ABG pattern is a high pH and low PaCO₂.
📘 Bicarbonate may remain normal initially because renal compensation takes time.
📘 Slowing the respiratory rate and treating the anxiety usually corrects the imbalance.
📘 This presentation is most consistent with respiratory alkalosis.
3. Persistent vomiting with NG tube suction → Metabolic alkalosis
📘 Vomiting and NG suction remove large amounts of gastric hydrochloric acid.
📘 Loss of hydrogen ions causes the blood pH and bicarbonate concentration to rise.
📘 The expected ABG pattern is a high pH and high HCO₃⁻.
📘 The lungs may compensate by retaining carbon dioxide through slower respirations.
📘 Potassium and chloride losses commonly accompany this imbalance.
📘 The nurse should monitor electrolytes, fluid status, and the amount of NG output.
📘 Treatment focuses on replacing volume, chloride, and potassium as prescribed.
📘 This condition is therefore most consistent with metabolic alkalosis.
4. COPD exacerbation → Respiratory acidosis
📘 During a COPD exacerbation, airflow obstruction can prevent adequate exhalation of carbon dioxide.
📘 Carbon dioxide retention increases carbonic acid and lowers the blood pH.
📘 The expected ABG pattern is a low pH and high PaCO₂.
📘 Chronic COPD may also produce an elevated bicarbonate level because the kidneys retain bicarbonate for compensation.
📘 Audible wheezing and dyspnea indicate impaired ventilation rather than a primary metabolic disturbance.
📘 A worsening pH may indicate acute respiratory decompensation on top of chronic compensation.
📘 The nurse should monitor respiratory effort, oxygenation, mental status, and ABG trends.
📘 This presentation is most consistent with respiratory acidosis.