A New Surgical Strategy to Protect the Inferior Parathyroid

Study Overview
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Brief Summary
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The incidence of temporary hypoparathyroidism after thyroid surgery is 14%-60%, and the incidence of permanent hypoparathyroidism is 4%-11%. The protection of parathyroids has always been the focus and difficulty of thyroid surgery. The anatomical position of the superior parathyroids is relatively fixed, and can be preserved in situ easily; while the anatomical position of inferior parathyroids varies greatly between patients. It is always difficult to look for, identify, and protect them. Concepts such as thyro-thymic ligament and thymus-vascular-inferior parathyroid plane were raised to help identify the inferior parathyroids. We found that this surgical strategy can protect inferior parathyroids in situ effectively in our retrospective studies. Thus, we are going to carry out a prospective study to compare the new method and the traditional method of thyroidectomy, to see if more inferior parathyroids can be protected in situ through the new surgical strategy.

Official Title
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Dissection of Thyroid and Central Lymph Nodes Based on Layer of Thymus-blood Vessel-inferior Parathyroid Gland Complex for Preserving the Inferior Parathyroids

Conditions
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Thyroid Cancer

Intervention / Treatment
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* Procedure: Resection based on thymus-vascular-inferior parathyroid complex


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: initial thyroid surgery; thyroidectomy with/without central lymph node dissection Exclusion Criteria: coexisting parathyroid disease; need lateral neck dissection; history of radio-iodine ablation treatment

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Resection based on thymus-vascular-inferior parathyroid complex<br> | Procedure: Resection based on thymus-vascular-inferior parathyroid complex<br>* Before clearing the central lymph nodes, looking for the thyro-thymic ligament first, looking for the inferior parathyroid along the thyro-thymic ligament. Dissect and leave the thymus-vascular-inferior parathyroid complex laterally; the inner side of this layer is the tissue of the central area. Then remove the central lymph nodes. Check for parathyroids in the removed specimen, transplant the parathyroids which are removed by accident.<br>|
| No Intervention: Traditional thyroidectomy method<br> | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Primary outcome | the incidence of hypothyroidism | Postoperative day 1 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Secondary outcome | the incidence of parathyroid hormone reduced greater than 50% than parathyroid hormone level before surgery | Postoperative day 1 |