Physiological Adaptation — NCLEX-RN Practice
Covers managing acute, unstable, or chronic physiological conditions — pathophysiology, fluid and electrolyte balance, medical emergencies, and hemodynamic monitoring.
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What you must know about Physiological Adaptation
Electrolyte imbalance questions test recognizing the clinical presentation, not just the lab number — e.g., peaked T waves for hyperkalemia.
Emergency questions almost always test the immediate first action using ABC or the most life-threatening finding first.
Chronic disease questions test recognizing an acute exacerbation versus expected baseline for that condition.
Hemodynamic questions (shock, sepsis, heart failure) test connecting the type of shock to its expected vital sign pattern.
NCLEX Exam Tips
How this category appears on the NCLEX-RN exam
When multiple abnormal findings are given, treat the airway/breathing/circulation threat first, regardless of how the option is worded.
Match each electrolyte imbalance to its single most classic ECG or clinical sign — this is tested repeatedly across different question stems.
Practice Questions
Test yourself — 10 questions
Practice questions written to the NCSBN NCLEX-RN test plan. The NCSBN does not publish real exam items, so no provider has genuine NCLEX past questions. Every question here comes with a full written rationale.
A 68-year-old male with a history of chronic obstructive pulmonary disease (COPD) is admitted to the hospital with increased shortness of breath and a productive cough. His oxygen saturation is 88% on room air, and he is using accessory muscles to breathe. Which nursing intervention should be prioritized for this patient?
Rationale
The priority intervention for a patient with COPD and low oxygen saturation is to initiate oxygen therapy titrated to maintain SpO2 between 88% and 92%. COPD patients often rely on a hypoxic drive to breathe, and driving saturation above this range risks hypercapnia and CO2 narcosis. Positioning the patient flat can decrease lung expansion and worsen hypoxia. Encouraging fluid intake is helpful for thinning secretions but is not the priority. Administering a sedative can depress respiration and is contraindicated in this scenario.
A 35-year-old female with a history of hypothyroidism presents to the clinic with fatigue, weight gain, and cold intolerance. Her TSH level is elevated. What adjustment to her medication regimen would the nurse anticipate?
Rationale
An elevated TSH level in a patient with hypothyroidism indicates that the current dose of levothyroxine is insufficient and needs to be increased. Decreasing or discontinuing the medication would worsen symptoms. A beta-blocker is not used to treat hypothyroidism and would not address the underlying problem.
A 50-year-old female with a history of type 2 diabetes is admitted with a blood glucose level of 580 mg/dL, polyuria, and confusion. Which electrolyte imbalance is she at most risk for?
Rationale
In hyperglycemic states, such as diabetic ketoacidosis, osmotic diuresis can lead to loss of potassium in the urine, resulting in hypokalemia. Hyperkalemia can occur but is less common initially. Hyponatremia can occur due to fluid shifts but is less of an immediate concern compared to potassium levels. Hypercalcemia is not typically associated with hyperglycemia.
A 60-year-old male with heart failure presents with swelling in his legs, shortness of breath, and an S3 heart sound. Which medication is most appropriate for managing his fluid overload?
Rationale
Furosemide, a loop diuretic, is appropriate for managing fluid overload in heart failure by promoting diuresis and reducing edema. Lisinopril and metoprolol are used to manage heart failure by reducing cardiac workload but do not directly manage acute fluid overload. Digoxin improves cardiac contractility but does not address fluid retention.
A 68-year-old male with a history of chronic obstructive pulmonary disease (COPD) is admitted to the hospital with increasing shortness of breath and wheezing. His oxygen saturation is 88% on room air. What is the most appropriate initial nursing intervention?
Rationale
Administering bronchodilator therapy addresses the active bronchospasm and wheezing driving this patient's acute presentation, making it the most appropriate initial intervention. Oxygen is still indicated for a COPD patient with an SpO2 of 88% — hypoxemia is never withheld — but it should be titrated to a target of 88% to 92% rather than run at a high, unrestricted flow rate like 15 L/min. Over-oxygenating a COPD patient risks CO2 retention primarily through worsened ventilation-perfusion (V/Q) mismatch and the Haldane effect, not through suppression of respiratory drive, which is an outdated explanation for this risk. Pursed-lip breathing is beneficial for prolonging exhalation but is not the immediate priority. Supine positioning is contraindicated as it reduces lung expansion and worsens hypoxia.
A 56-year-old female with type 2 diabetes is admitted with a blood glucose level of 550 mg/dL and blood pH of 7.1. She is lethargic and has Kussmaul respirations. What is the priority nursing action?
Rationale
The priority action is to start an IV with normal saline to treat dehydration and restore fluid balance. Insulin administration is important but follows fluid resuscitation. Sodium bicarbonate is not routinely given unless acidosis is severe. Oral glucose is inappropriate due to high blood glucose levels.
A 45-year-old male recovering from abdominal surgery is experiencing decreased bowel sounds and abdominal distention. What should the nurse do first?
Rationale
Encouraging the patient to ambulate can stimulate peristalsis and help resolve postoperative ileus. Administering a laxative without bowel sounds can cause complications. NG tube insertion is not the first step. Increasing oral fluids may not be effective if peristalsis is impaired.
A 70-year-old female with heart failure presents with sudden chest pain, dyspnea, and frothy pink sputum. What is the priority nursing intervention?
Rationale
Initiating high-flow oxygen therapy is the priority to address the acute pulmonary edema and improve oxygenation. Morphine may be administered for pain and to reduce preload but is not the first action. Elevating the head of the bed is supportive but less immediate. Preparing for intubation is not the first step unless respiratory failure is imminent.
A 35-year-old male with a history of asthma is experiencing an acute asthma attack. He has already used his rescue inhaler twice with no relief. Which medication should the nurse anticipate administering next?
Rationale
Nebulized albuterol is indicated for acute exacerbation of asthma when inhaler use is insufficient. Oral prednisone is not fast-acting. IV magnesium sulfate is used in severe, refractory cases. Aminophylline is less commonly used due to side effects and interactions.
A 60-year-old female with chronic kidney disease is scheduled for hemodialysis. Her laboratory results show a potassium level of 6.5 mEq/L. What is the most important nursing action before dialysis?
Rationale
Monitoring the cardiac rhythm is crucial as hyperkalemia can cause life-threatening arrhythmias. Kayexalate is not immediate in action. Dietary restriction is a long-term measure. Diuretics are not effective in patients with significant renal impairment.
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