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Diagnostic tests show that a patient's bone density has decreased over the past several years. The patient asks the nurse what factors contribute to bone density decreasing. What would be the nurse's best response?
- A. For many people, lack of nutrition can cause a loss of bone density.
- B. Progressive loss of bone density is mostly related to your genes.
- C. Stress is known to have many unhealthy effects, including reduced bone density.
- D. Bone density decreases with age, but scientists are not exactly sure why this is the case.
Correct Answer: A
Rationale: Nutrition has a profound effect on bone density, especially later life. Genetics are also an important factor, but nutrition has a more pronounced effect. The pathophysiology of bone density is well understood and psychosocial stress has a minimal effect.
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A nurse is explaining a patient's decreasing bone density in terms of the balance between bone resorption and formation. What dietary nutrients and hormones play a role in the resorption and formation of adult bones?
- A. Thyroid hormone
- B. Growth hormone
- C. Estrogen
- D. Vitamin B12
- E. Luteinizing hormone
Correct Answer: A,B,C
Rationale: The balance between bone resorption and formation is influenced by the following factors: physical activity; dietary intake of certain nutrients, especially calcium; and several hormones, including calcitriol (i.e., activated vitamin D), parathyroid hormone (PTH), calcitonin, thyroid hormone, cortisol, growth hormone, and the sex hormones estrogen and testosterone. Luteinizing hormone and vitamin B12 do not play a role in bone formation or resorption.
A nurse is caring for a patient with a diagnosis of cancer that has metastasized. What laboratory value would the nurse expect to be elevated in this patient?
- A. Bilirubin
- B. Potassium
- C. Alkaline phosphatase
- D. Creatinine
Correct Answer: C
Rationale: Alkaline phosphatase is elevated during early fracture healing and in diseases with increased osteoblastic activity (e.g., metastatic bone tumors). Elevated bilirubin, potassium, and creatinine would not be expected in a patient with metastatic bone tumors.
A patient is undergoing diagnostic testing for suspected Paget's disease. What assessment finding is most consistent with this diagnosis?
- A. Altered serum magnesium levels
- B. Altered serum calcium levels
- C. Altered serum potassium levels
- D. Altered serum sodium levels
Correct Answer: B
Rationale: Serum calcium levels are altered in patients with osteomalacia, parathyroid dysfunction, Paget's disease, metastatic bone tumors, or prolonged immobilization. Paget's disease is not directly associated with altered magnesium, potassium, or sodium levels.
The human body is designed to protect its vital parts. A fracture of what type of bone may interfere with the protection of vital organs?
- A. Long bones
- B. Short bones
- C. Flat bones
- D. Irregular bones
Correct Answer: C
Rationale: Flat bones, such as the sternum, provide vital organ protection. Fractures of the flat bones may lead to puncturing of the vital organs or may interfere with the protection of the vital organs. Long, short, and irregular bones do not usually have this physiologic function.
The nurse is performing an assessment of a patient's musculoskeletal system and is appraising the patient's bone integrity. What action should the nurse perform during this phase of assessment?
- A. Compare parts of the body symmetrically.
- B. Assess extremities when in motion rather than at rest.
- C. Percuss as many joints as accessible.
- D. Administer analgesia 30 to 60 minutes before assessment.
Correct Answer: A
Rationale: When assessing bone integrity, symmetric parts of the body, such as extremities, are compared. Analgesia should not be necessary and percussion is not a clinically useful assessment technique. Bone integrity is best assessed when the patient is not moving.