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Related Concept Videos

The Parathyroid Glands00:59

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The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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Related Experiment Video

Updated: Jun 1, 2025

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
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Parathyroid Hormone Fluctuations During Thyroid and Parathyroid Surgery.

Emily S Sagalow1, Yuna Kim1, Shirley Wong1

  • 1Department of Otolaryngology-Head and Neck Surgery University of Nevada Las Vegas School of Medicine Las Vegas Nevada USA.

OTO Open
|January 20, 2025
PubMed
Summary

Parathyroid hormone (PTH) levels increase with general anesthesia and surgery in patients undergoing thyroid surgery. However, responses vary in patients with abnormal parathyroid function undergoing parathyroidectomy.

Keywords:
parathyroid hormoneparathyroidectomyperioperativestress hormonethyroidectomy

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Area of Science:

  • Endocrinology
  • Anesthesiology
  • Surgical Science

Background:

  • General anesthesia and surgery elevate stress hormones like cortisol and epinephrine.
  • Parathyroid hormone (PTH) response to anesthesia is documented in parathyroidectomy (PT) patients with abnormal parathyroid function, but conflicting data exists for those with normal function.

Purpose of the Study:

  • To investigate the impact of anesthetic and surgical stress on PTH levels.
  • To compare PTH responses in patients with abnormal parathyroid function undergoing PT versus those with normal function undergoing thyroidectomies (unilateral/total thyroidectomies - UTs/TTs).

Main Methods:

  • A prospective study was conducted at a single tertiary academic center.
  • PTH levels were measured in 160 patients (77 TT, 31 UT, 52 PT) preoperatively, post-anesthetic induction, intraoperatively, and postoperatively.

Main Results:

  • Mean PTH levels significantly increased post-induction and intubation across all groups (TT: 113.8% increase, UT: 128.4% increase, PT: 34.1% increase).
  • PTH remained elevated until excision, with levels returning to baseline within 1 hour post-excision for UT patients.
  • The PT group exhibited more variable PTH responses to anesthesia induction compared to the thyroidectomy groups.

Conclusions:

  • Anesthetic and surgical stress consistently elevate PTH in adults undergoing UT and TT with normal preoperative parathyroid function.
  • Patients with hyperparathyroidism undergoing PT showed variable PTH level changes in response to stress.