Hyperparathyroidism

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Hyperparathyroidism

  1. 2. Disorders of Parathyroid glands BY Hosam M. Hamza, Msc General surgeon & Endoscopist Minia School of Medicine MINIA - EGYPT
  2. 3. <ul><li>Parathyroid glands were discovered by Ivar Viktor Sandström (1852-1889), a Swedish medical student, in 1880. It was the last major organ to be recognized in humans. </li></ul>
  3. 5. ANATOMY <ul><li>* 4 small yellowish brown bodies, situated as a rule between the posterior borders of the lateral lobes of the thyroid gland and its capsule. </li></ul><ul><li>* In 1% of population, their number is less than 4; but more than 4 is the number in about over 33 %. </li></ul><ul><li>* In addition, numerous minute islands of parathyroid tissue may be found scattered in the connective tissue and fat of the neck. </li></ul>
  4. 6. <ul><li>* They are divided, according to their situation, into superior and inferior. The superior are more constant in position, and are situated, one on either side, at the level of the lower border of the cricoid cartilage. </li></ul><ul><li>*The inferior, may be applied to the lower edge of the lateral lobes, or placed at some little distance below the thyroid gland, or found in relation to one of the inferior thyroid veins. </li></ul>
  5. 7. <ul><li> APPEARANCE </li></ul><ul><li>* shape : ovoid, polypoid or spherical. </li></ul><ul><li>*colour : yellowish brown. </li></ul><ul><li>*size :6 x 3 x 2 millimeters. </li></ul><ul><li>*Wt :35 - 40 milligrams. </li></ul>
  6. 9. <ul><li>Blood supply ? </li></ul><ul><li>*Each parathyroid gland is supplied by a branch from the inferior thyroid artery. </li></ul><ul><li>*Superior parathyroids are sometimes supplied by superior thyroid artery. </li></ul>
  7. 13. <ul><li>STRUCTURE </li></ul><ul><li>*C.T. stroma. </li></ul><ul><li>*Parenchyma: </li></ul><ul><li>*Chief cells. </li></ul><ul><li>*oxyphil cells. </li></ul>
  8. 14. FUNCTION OF THE PARATHYROID GLANDS <ul><li>*Despite its name, parathyroid gland carries out a different task compared to thyroid gland. </li></ul><ul><li>*Thyroid gland is mainly responsible for regulation of mental and physical development, while parathyroids regulate Ca and PO 4 metabolism. </li></ul>
  9. 16. Ca Metabolism <ul><li>*Importance of Ca in body: </li></ul><ul><li>1-B one mineralization. </li></ul><ul><li>2-B lood coagulation. </li></ul><ul><li>3-N euromuscular transmission. </li></ul><ul><li>4-N eurotransmitter release. </li></ul><ul><li>5-C ontraction of all muscle types. </li></ul><ul><li>6-C ell membrane permeability and excitability. </li></ul><ul><li>7-S ecretion of glands. </li></ul>
  10. 17. <ul><li>*Daily requirements: 1gm /day. (+ve Ca balance) </li></ul><ul><li>*Normal plasma Ca concentration : 9-11 mg% </li></ul><ul><li>*Absorption: ↓↑ </li></ul><ul><li>*Excretion: 75% in stool, 25% in urine. </li></ul>
  11. 18. <ul><li>Control Of Ca Homeostasis </li></ul><ul><li>1- PTH: </li></ul><ul><li>raises plasma Ca level if it is lowered by: </li></ul><ul><li>- Vit. D activation -> ↑ Ca absorption. </li></ul><ul><li>-↑ Ca reabsorption in DCT. </li></ul><ul><li>-↓ PO4 reabsorption in PCT. </li></ul><ul><li>-↑ Ca mobilization from bone. </li></ul><ul><li>2- CALCITONIN: </li></ul><ul><li>lowers plasma Ca level if it is raised by: </li></ul><ul><li>-↓ Ca absorption. </li></ul><ul><li>-↑ PO4 reabsorption in PCT. </li></ul><ul><li>-↓ Ca mobilization from bone. </li></ul><ul><li>3- VITAMIN D: </li></ul><ul><li>-↑ Ca absorption. </li></ul><ul><li>-↑ Ca bone uptake and deposition. </li></ul>
  12. 19. <ul><li>Hyper parathyroid ism </li></ul>
  13. 20. <ul><li>DEFINITION: </li></ul><ul><li>Overproduction of the parathyroid hormone (PTH) resulting in abnormal calcium homeostasis. </li></ul><ul><li>CAUSES (TYPES): </li></ul>
  14. 21. <ul><li>I. Primary Hyperparathyroidism </li></ul><ul><li>Def. autonomous PTH production with loss of feedback mechanism by EC Ca. </li></ul><ul><li>Incid. 0.1 – 0.3% </li></ul><ul><li>more in ♀ (3 :1) , may be familial </li></ul><ul><li>esp. between 45-60 years </li></ul><ul><li>Aet. -Single parathyroid adenoma (92%) </li></ul><ul><li>-Multiple adenomata (4%) </li></ul><ul><li>-Parathyroid hyperplasia (3%) </li></ul><ul><li>-Parathyroid carcinoma </li></ul><ul><li>-Paraneoplastic syndromes (< 1%) </li></ul>
  15. 22. 95% - - Multiple neuromata 80% - - Marfanoid body - - Insulinoma-gastrinoma Pancreatic tumours 50% + - Pheochromocytoma - - + Parath. hyperplasia 100% + - Medullary thyroid cancer - - + Pituitary Adenoma - Sipple’s syndrome Wermer’s syndrome Eponym MEN II B MEN II A MEN I (3p) Feature
  16. 23. <ul><li>Pathophysiology : </li></ul><ul><li>- In parathyroid adenomas : change in the set point of PTH release. </li></ul><ul><li>- In parathyroid hyperplasia : increase in cell numbers is probably the cause. </li></ul><ul><li>- Symptoms of hyperparathyroidism are due to: </li></ul><ul><li>*chronic excessive resorption of calcium from bone. </li></ul><ul><li>* hypercalcemia. </li></ul>
  17. 24. <ul><li>Symptoms: </li></ul><ul><li>“ Disease of bones , stones , abdominal groans and psychic moans &quot; </li></ul><ul><li>-Skeletal manifestations: </li></ul><ul><li>Bone and joint pain esp. in hand and feet (pseudogout). </li></ul><ul><li>-Renal manifestations: </li></ul><ul><li>polyuria, dysuria, renal colics or stone passage. </li></ul><ul><li>-Gastrointestinal manifestations: </li></ul><ul><li>anorexia, nausea, vomiting, abdominal pain, constipation, peptic symptoms. </li></ul><ul><li>-Neuromusculopsychologic manifestations: </li></ul><ul><li>proximal muscle weakness, easy fatigability, depression, inability to concentrate, and memory problems that are often poorly characterized and may not be noted by the patient. </li></ul><ul><li>-Cardiovascular manifestations : </li></ul><ul><li>palpitation and hypertensive symptoms. </li></ul><ul><li>-Hyperparathyroid Hypercalcaemic crisis: </li></ul><ul><li>-Asymptomatic hypercalcemia in most cases. </li></ul>
  18. 26. <ul><li>Physical Signs: </li></ul><ul><li>Examination is usually noncontributory but may reveal: </li></ul><ul><li>-muscle weakness. </li></ul><ul><li>-depression. </li></ul><ul><li>-hypertension and bradycardia. </li></ul><ul><li>-A palpable neck mass is not usually expected with hyperparathyroidism, although in rare cases, it may indicate parathyroid cancer. </li></ul>
  19. 27. <ul><li>Diagnostic Workup </li></ul><ul><li>(based on lab data) </li></ul><ul><li>I- Laboratory Studies: </li></ul><ul><li>1-Parathormone IA (core of the diagnosis). </li></ul><ul><li>2-Total or ionized serum calcium levels. 3- 24-hour urine calcium. </li></ul><ul><li>4-Dent’s test. </li></ul><ul><li>An elevated parathyroid hormone level with an elevated ionized serum calcium level is diagnostic of primary hyperparathyroidism. </li></ul><ul><li>normocalcemic hyperparathyroidism </li></ul><ul><li>(? 2ry) </li></ul>
  20. 28. <ul><li>II- Imaging studies: </li></ul><ul><li>used to: </li></ul><ul><li>-guide the surgeon once surgical therapy has been decided. </li></ul><ul><li>-detect skeletal manifestations. </li></ul><ul><li>1-Neck Ultrasonography: </li></ul><ul><li>*operator-dependent. </li></ul><ul><li>*not reliable in multigland disease. </li></ul>
  21. 29. Ultrasonography of the neck showing an extrathyroidal 10-mm diameter nodule below the left thyroid lobe (white arrow) consistent with a parathyroid mass.
  22. 30. <ul><li>2-Nuclear scanning: (Sestamibi scan) </li></ul><ul><li>*Radiolabeled sestamibi is concentrated in thyroid and parathyroid tissues but usually washes out of normal thyroid in under an hour and persists in abnormal parathyroid tissue that can be seen as a persistent focus of activity on delayed images. </li></ul><ul><li>  *Sensitivity for  solitary adenomas ranges between 60-90%. </li></ul><ul><li>  * Scan can include the mediastinum and, thus, is extremely useful in cases of an ectopic adenoma or previously failed surgical exploration. </li></ul>
  23. 31. Sestamibi scan
  24. 32. Sestamibi scan
  25. 33. <ul><li>3-CT and MRI scanning. </li></ul><ul><li>4- X-ray and DXA. </li></ul><ul><li>Subperiosteal resorption Brown tumor in the phalanx </li></ul><ul><li>as well as acroosteolysis with subperiosteal resorption </li></ul>
  26. 34. <ul><li>Brown tumor in the inferior obturator ramus </li></ul>Salt and pepper skull Normal skull following treatment
  27. 35. <ul><li>TREATMENT OF 1 RY HYPERPARATHYROIDISM </li></ul>
  28. 36. <ul><li>MEDICAL CARE: </li></ul><ul><li>-Lifestyle: </li></ul><ul><li>*regular exercise. </li></ul><ul><li>*avoidance of immobilization. </li></ul><ul><li>-Diet: </li></ul><ul><li>*good hydration. </li></ul><ul><li>*moderate daily Ca intake of 800-1000 mg. </li></ul><ul><li>*vitamin D intake appropriate for age and sex. </li></ul><ul><li>-Drugs: </li></ul><ul><li>*Calcimimetics (e.g. cinacalcet) </li></ul><ul><li>*Oestrogen therapy (postmenopausal). </li></ul><ul><li>*Bisphosphonates. </li></ul><ul><li>*PPA (percutaneous parathyroid ablation) Techniques. </li></ul><ul><li>*avoid thiazides, diuretics, lithium, …etc. </li></ul>
  29. 37. <ul><li>SURGICAL CARE: </li></ul><ul><li>-Since 1925, the gold standard treatment for Primary Hyperparathyroidism is Parathyroidectomy. </li></ul><ul><li>-Some clinicians advocate surgical therapy in all patients with primary hyperparathyroidism, modified only for those patients who are not able to tolerate surgery. </li></ul><ul><li>NIH Workshop </li></ul><ul><li>(2002) </li></ul><ul><li>-Indications For Surgery: </li></ul><ul><li>*Any age younger than 50 years. </li></ul><ul><li>*1.0 mg/dL above the upper limit serum Ca. </li></ul><ul><ul><ul><li>*24-hour urinary Ca excretion > 400 mg. </li></ul></ul></ul><ul><ul><ul><li>*BMD score below -2.5 at any site. </li></ul></ul></ul><ul><ul><ul><li>*A 30% reduction in creatinine clearance </li></ul></ul></ul>
  30. 38. <ul><li>-Choice of the procedure: </li></ul><ul><li>*identification of all parathyroid glands and removal of all abnormal glands. </li></ul><ul><li>*In the case of 4-gland hyperplasia, a 3.5-gland is performed ( subtotal parathyroidectomy ). </li></ul><ul><li>Preoperative Localization </li></ul><ul><li>Sestamibi Scan. HRUS. </li></ul><ul><li>CT. MRI. </li></ul><ul><li>Intraoperative Localization </li></ul><ul><li>Intraopartive PTH assay Radioguided parathyroidectomy </li></ul>
  31. 39. Intraopartive PTH assay
  32. 40. <ul><li>Radioguided parathyroidectomy </li></ul>
  33. 42. <ul><li>POSTOPERATIVE CARE &COPMPLICATIONS </li></ul><ul><li>-If a directed parathyroidectomy is performed successfully, most of these patients may be safely discharged the day of surgery. </li></ul><ul><li>-For a full parathyroid exploration, Ca levels must be monitored postoperatively every 12 hours until stabilization. (24-72 hrs pop). Many patients become hypocalcemic, but few become symptomatic. </li></ul><ul><li>Chvostek’s sign Trousseau’s Sign </li></ul>
  34. 43. <ul><ul><li>- Recurrent L. Nerve injury. </li></ul></ul><ul><ul><li>A potential life-threatening emergency in the postoperative period is the development of an expanding hematoma in the pretracheal space. </li></ul></ul><ul><ul><li>- Regular follow up in the early pop period (2 wks) for estimation of PTH and Ca levels after surgery. </li></ul></ul>
  35. 44. <ul><li>II. Secondary Hyperparathyroidism </li></ul><ul><li>Increased PTH secretion 2ry to prolonged or intense hypocalcaemia as in CRF, malabsorption, rickets,…etc. </li></ul><ul><li>III. Tertiary Hyperparathyroidism </li></ul><ul><li>Prolonged (refractory) 2ry type-> chief cell hyperplasia-> ↑ PTH + ↑ Ca. </li></ul><ul><li>T.T.T. </li></ul><ul><li>-essentially medical: vit D., Ca and PO4 binding agents. </li></ul><ul><li>-surgery. If other measures failed. </li></ul>
  36. 45. THANKS

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