hyperparathyroidism: a case for surgery
TRANSCRIPT
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HYPERPARATHYROIDISM: A CASE FOR SURGERY Christine Kollmorgen, MD,
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• No Disclosures
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OBJECTIVES Understand the indications for surgery for HPT Highlight the benefits of surgery for HPT Explore surgical techniques Explore controversies
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PARATHYROIDS
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PARATHYROID HORMONE
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PRIMARY HPT Elevated PTH. Normal or increased serum Ca Due to: Parathyroid adenoma (85%) Parathyroid hyperplasia (15%) Parathyroid carcinoma (<1%)
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SECONDARY HYPERPARATHYROIDISM Caused by Renal Failure Elevated PTH Normal or low Calcium levels High phosphorus Responds to Vit D and phosphate binders
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TERTIARY HYPERPARATHYROIDISM Elevated PTH Elevated Ca No longer responds to Vit D Responds to Sensipar
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TYPICAL PATIENT Hypercalcemic 56 year old woman with osteoporosis by DEXA scan. Ca of 10.9 PTH 85 T score < -2.5 at the hips
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Differential Diagnosis Hyperparathyroidism Malignancy
Lytic metastases to bone PTHrP producer
Sarcoidosis / granulomatous disease Vit D deficiency Thiazides Hyperthyroidism Familial hypocalciuric hypercalcemia
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Signs and Symptoms
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Symptomatic or Asymptomatic
Symptomatic Asymptomatic
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HYPERPARATHYROIDISM DIAGNOSTIC TESTS Serum Calcium Serum PTH Dexa Scan Urine Calcium Phosphorus Vitamin D KUB GFR
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ULTRASOUND
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SESTAMIBI SCAN
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4D-CT
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When to use 4D-CT
• Not needed in sporadic primary HPT • Costs more • No improvement in failure rate (need for reop)
• Reoperative neck • Findings on US and sestamibi scanning are discordant or
negative • Preop imaging is poor quality
Abbott , Perrier et al 2012 Outcomes and Economic Analysis of Routine Preop 4D-CT for Surgical Intervention in de novo Primary Hyperparathyroidism. JACS 629-637. Lubitz, Gawande et al Accuracy of 4D CT in poorly localized patients with primary hyperparathyroidism. Surgery 2010 1 1129-31.
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PRIMARY HYPERPARATHYROIDISM FINDINGS
Hypercalcemia Elevated Parathyroid Hormone Level PTH Elevated Urine Ca Decreased Bone Density Normal GFR, Vit D, Normal Phosphorus, No Stones
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NIH Guidelines 1990-2002-2008
All symptomatic If asymptomatic
Serum Calcium above 1.0 mg/dL GFR<60 mL/min T score < -2.5 at any site and/or fracture fragility < 50 years old Elevated urine calcium Creatine clearance
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When monitoring is not “suitable”
• Patient requests surgery • Consistent follow up is unlikely • Coexistent illness complicates management • Young age
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Follow up 1-3 years
• Serum calcium • Serum creatinine • Repeat bone density measurement after 1 to 2 years
24 hour urine calcium Abdominal xray
51 people on panel 2 were surgeons….
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Silverberg, NEJM 1990
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Nakaoka, JCEM 2000
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Mollerup, BMJ 2002
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Chan, Ann Surg 1995; and Eigelberger Ann Surg 2004
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Weaker Evidence
• HPT = increased risk of death from cancer and CV disease • Swedish population study found that for those over age 70 risk
of death with HPT 1.5 times higher than matched controls • Death rate improves • Hypertension improves • Diabetes and obesity improve • Elderly (>80) patients enjoy same benefits Palmer M, Bergstrom R, Akerstrom G, Adami H, Jakobsson S, Ljunghall S. 1987 Survival and renal function in untreated hypercalcemia. Population-based cohort study with 14 years of follow-up. Lancet. 1:59–62. Soreide JA, van Heerden JA, Grant CS, Lo CY, Schleck C, Ilstrup DM. 1997 Survival after surgical treatment for primary hyperparathyroidism. Surgery. 122:1117–1123. Hedback G, Oden A, Tisell LE. 1991 The influence of surgery on the risk of death in patients with primary hyperparathyroidism. World J Surg. 15:399–405; discussion 406–407.
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Controversies
• MIP or 4 gland exploration? • Preop sestamibi injection? • Routine use of IOPTH? • Routine use of nerve stimulators? • Low volume centers?
• Total with reimplantation or subtotal with portion of gland
left in situ • Cryopreservation
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MIP
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4 GLAND EXPLORATION
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BENEFITS OF PREOPERATIVE LOCALIZATION
• Smaller incision • Shorter operative time • Different anesthesia options • Ambulatory vs. overnight • Decrease rate of missed or multiple adenomas
(controversy)
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Two Weeks Post-op MIP Four gland exploration
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Parathyroid Adenoma
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ALTERNATIVE VIEWS Rate of missed double adenoma too high w/MIP 4 gland exploration indicated in all patients This saves time and money
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IOPT Finally Here!! Used routinely in some centers Used selectively Re operative neck Difficult localization
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Norman et al
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CASE PRESENTATION 56 year old female with osteoporosis and mild symptoms Ca of 10.9 PTH 85 Sestamibi lights up in the right lower station US Confirms lesion in right lower station Hx of right thyroid lobectomy for a benign follicular adenoma 4 years
ago.
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At surgery… After a brief search, a plump parathyroid “adenoma” was found right where it was supposed to be, weighed 1.2 grams and on frozen looked like parathyroid tissue but the pathologist was unsure if it was an adenoma, hypercellular or normal gland. Remainder of the right side is normal, smaller superior gland found and confirmed. The case was concluded. No IOPT available/used.
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Post op… • Ca level is 10.2 • PTH is 87 • Pathology: normal parathyroid gland “After a century of incredible dicovery, most diseases have proved to be far more particular and difficult to treat.” - Atul Gawande The Checklist Manifesto
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Surgical Pitfalls
• Aberrant Location: 5-10% • Multiple Adenomas: 10-20% • Non recurrent laryngeal nerve • Inflammatory states • Misleading preoperative localizations • Misdiagnosis • Unreliable pathology
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Misleading Preoperative Studies
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How to Prevent Surgical Misadventure
Do the right operation the first time
Concordant imaging Concordant labs 4D CT if necessary Full neck exploration if
not satisfied Use IOPTH
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Experience at Sacred Heart 2011
128 Cases
single adenoma
multiple adenoma
4 gland hyperplasia
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Primary HPT
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
Outpatient Came back for Hypocalcemia
Couldn't find Found but did not cure
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Personal Experience Community Surgeon since 2001
0% 10% 20% 30% 40% 50% 60% 70% 80% 90%
100%
Outpatient Inpatient Found/Cured Did not find/cure
289 cases
289 cases
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Summary
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Summary • HPT affects many organ systems of the body. • Significant health problems are associated with the
condition. • Individuals with mild parathyroid disease and severe
parathyroid disease are very similar, and likely to benefit from parathyroid surgery.
• Bone health is improved • Kidney stone events decrease • About 70% of people experience improvements in health-
related quality of life • Elderly individuals should not be denied this option. • Surgical technique improvements
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Thank You