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Difficulty: MediumPhysical Examination Findings

A surgical resident is urgently called to the bedside of a patient who underwent an uncomplicated total thyroidectomy 24 hours prior. The patient is complaining of acute-onset perioral numbness and tingling in the fingertips. The resident suspects a common postoperative metabolic complication related to inadvertent parathyroid gland injury or ischemia. If this clinical suspicion is correct, which of the following physical examination findings are most likely to be elicited in this patient? (Select all that apply)

  1. Induction of carpal spasm by inflating a sphygmomanometer cuff above the systolic blood pressure for 3 minutesAnswer
  2. Twitching of the ipsilateral facial muscles when tapping over the facial nerve anterior to the earAnswer
  3. C
    Delayed relaxation phase of the ankle jerk deep tendon reflex
  4. D
    Diffuse flaccid muscle weakness with depressed deep tendon reflexes
  5. E
    Rapid, irregular flapping tremors upon sustained extension of the wrists

Answer

The correct findings are the induction of carpal spasm by inflating a blood pressure cuff (Trousseau sign) and twitching of the ipsilateral facial muscles upon tapping the facial nerve (Chvostek sign).
The clinical vignette describes a classic presentation of post-surgical hypoparathyroidism, a well-known complication of total thyroidectomy. The resulting acute hypocalcemia causes increased neuromuscular excitability. On physical examination, this is classically elicited by two provocative tests: the Trousseau sign (carpal spasm triggered by inflating a sphygmomanometer above the systolic pressure for 3 minutes, which induces local ischemia and exacerbates the irritability of the peripheral nerves) and the Chvostek sign (contraction of the ipsilateral facial muscles when the facial nerve is tapped just anterior to the ear).

Step-by-Step Solution

1
Identify the underlying clinical syndrome based on the patient's surgical history and acute symptoms.
The patient's perioral numbness and fingertip tingling 24 hours post-thyroidectomy indicate acute hypocalcemia resulting from transient or permanent hypoparathyroidism.
The parathyroid glands are anatomically adjacent to the thyroid and share a blood supply, making them highly susceptible to inadvertent injury, removal, or ischemia during thyroid surgery.
2
Determine the expected physical examination findings that correlate with this acute metabolic derangement.
Acute hypocalcemia lowers the threshold potential for voltage-gated sodium channels, causing neuromuscular irritability and tetany, classically demonstrated by Trousseau sign and Chvostek sign.
These provocative maneuvers physically demonstrate the heightened neuronal excitability characteristic of low extracellular ionized calcium.

Key Concept

Hypocalcemia typically presents with neuromuscular irritability (tetany), clinically demonstrable via Trousseau sign and Chvostek sign, and is a classic complication following thyroidectomy.
Estimated Time:1m 30s
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Physical Examination Findings

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