Question

A 50-year-old man with chronic leukemia (CLL) is receiving long-term corticosteroid therapy and has recently with steroid-induced osteoporosis. He is started on oral bisphosphonates to reduce fracture risk. The clinician advises him to maintain good oral hygiene and dental unless necessary due to the risk of osteonecrosis of the jaw, a rare but serious complication where jawbone tissue dies following trauma or infection. Why is this patient at risk for developing osteonecrosis of the jaw while on bisphosphonate therapy?

Answer 1

Correct Answers:

bisphosphonate inhibit bone resorption, impairing healing after dental trauma

Rationale :

♦️Bisphosphonates inhibit osteoclast activity, reducing bone resorption and turnover.

♦️ In the jaw, where microtrauma is frequent (e.g., chewing or dental procedures), this impaired bone remodeling can lead to osteonecrosis.

♦️ The jawbone is particularly vulnerable due to its high vascularity and exposure to oral flora.

♦️ Dental extractions or poor oral hygiene increase risk by introducing infection or trauma that the jaw cannot heal from properly.

♦️ Therefore, clients on long-term bisphosphonates are advised to avoid elective dental surgery and maintain strict oral care.

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Answer 2

Correct Answers:

Corticosteroid-induced immunosuppression.

Rationale :

🛡️ Long-term corticosteroid therapy suppresses the immune system, particularly T-cell function and inflammatory responses.

🛡️ This impairs the body's ability to fight opportunistic infections, making even minor infections a serious threat.

🛡️ The risk is compounded in a patient with CLL, who already has defective B-cell immunity.

🛡️ As a result, these patients are often placed on antiviral prophylaxis (e.g., acyclovir) to prevent infections.

🛡️ Immunosuppression is a critical consideration in managing patients on long-term steroids.

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Answer 3

Correct Answers:

DEXA scan.

Rationale :

⏺️A DEXA (dual-energy X-ray absorptiometry) scan is used to evaluate bone mineral density and diagnose osteoporosis.

⏺️Given the patient’s chronic steroid use and progressive back pain, osteoporosis or vertebral fractures are likely.

⏺️DEXA is non-invasive and provides a quantitative measure of bone loss, essential in managing corticosteroid-induced bone disease.

⏺️Identifying reduced BMD early allows for timely treatment with agents like bisphosphonates or calcium/vitamin D.

⏺️MRI may follow if fractures or malignancy are suspected, but DEXA is the first step for bone loss.

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Answer 4

Correct Answers:

Accidental removal or damage to parathyroid glands.

Rationale :

🟢The parathyroid glands, located close to the thyroid, may be accidentally damaged or removed during thyroidectomy.

🟢These glands regulate calcium homeostasis via parathyroid hormone (PTH).

🟢Loss of PTH leads to hypocalcemia, causing symptoms like tetany, numbness, and cramps.

🟢The symptoms described (tingling, spasms) are classic signs of post-thyroidectomy hypoparathyroidism.

🟢Calcium monitoring is essential after surgery involving the thyroid or parathyroid area.

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Answer 5

Correct Answers:

Parathyroid hormone (PTH).

Rationale :

🩸PTH is the primary regulator of serum calcium by stimulating bone resorption, renal calcium reabsorption, and vitamin D activation.

🩸After thyroidectomy, decreased PTH from gland damage leads to hypocalcemia.

🩸The symptoms presented (numbness, spasms) are directly linked to low calcium due to PTH deficiency.

🩸Neither TSH, estrogen, nor cortisol directly regulate calcium as effectively as PTH.

🩸The lab findings also confirm low PTH levels as the cause.

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Answer 6

Correct Answers:

Calcium and vitamin D supplementation.

Rationale :

🟣The first-line treatment for post-thyroidectomy hypocalcemia is oral or IV calcium supplementation, depending on severity.

🟣Vitamin D (typically calcitriol) is added to enhance intestinal absorption of calcium.

🟣This combination restores serum calcium levels and prevents neuromuscular excitability.

🟣Magnesium is only added if it's low; potassium and levothyroxine do not correct calcium deficits.

🟣Monitoring calcium and symptoms helps tailor dosage adjustments.

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Answer 7

Correct Answers:

Hypocalcemia.

Rationale :

🟠Among the listed electrolyte disturbances, hypocalcemia is most concerning due to its life-threatening potential.

🟠 It can cause laryngospasm, seizures, and cardiac arrhythmias if untreated.

🟠The patient's symptoms—tingling, spasms, cramping—are textbook signs of low calcium.

🟠 The lab confirms this with calcium of 7.1 mg/dL, well below normal range.

🟠 Prompt correction prevents neurological and cardiac complications.

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Answer 8

Correct Answers:

Hypoparathyroidism.

Rationale :

🔴Hypoparathyroidism, often iatrogenic, is the most common cause of hypocalcemia after thyroid surgery.

🔴 It results in low PTH levels, leading to impaired calcium reabsorption and reduced vitamin D activation.

🔴 The patient’s low serum calcium and suppressed PTH support this diagnosis.

🔴Symptoms of hypocalcemia emerge quickly due to PTH deficiency, often within days post-op.

🔴 The diagnosis is confirmed by lab correlation and recent surgical history.

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Answer 9

Correct Answers:

Blood cultures.

Rationale :

🩸 In a patient with febrile neutropenia, the most urgent step is to obtain blood cultures before starting broad-spectrum antibiotics.

🩸 With an ANC < 500/mm³, patients are highly susceptible to bacteremia.

🩸 Blood cultures help guide therapy based on organism sensitivity, improving outcomes.

🩸 Delayed identification can lead to septic shock in neutropenic patients.

🩸 Other diagnostics (e.g., chest X-ray, CT) follow after cultures and antibiotics are initiated.

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Answer 10

Correct Answers:

Myelosuppression.

Rationale :

🟠Chemotherapy-induced myelosuppression leads to bone marrow suppression, resulting in low neutrophil production.

🟠An ANC < 500/mm³ indicates severe neutropenia, placing the patient at high risk for infection.

🟠Fever in this context is a medical emergency, often due to opportunistic bacterial or fungal infections.

🟠Myelosuppression is a dose-limiting toxicity of many chemotherapeutic agents.

🟠Management includes broad-spectrum antibiotics and sometimes G-CSF for neutrophil recovery.

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SC1326-Final Exam A

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