Contribution of ICG Angiography in the Detection of Parathyroids and the Prevention of Hypoparathyroidism Post Total Thyroidectomy

* Hypoparathyroidism is the most common complication after a total thyroidectomy surgery. It becomes permanent after 6 months. * Untreated permanent hypoparathyroidism is a source of numerous complications in general and therefore requires lifelong replacement therapy resulting in a significant deterioration in quality of life. * The intraoperative use of indocyanine green (ICG) angiography has recently been described as a reliable means of detecting parathyroidism and predicting the risk of postoperative hypoparathyroidism. * This use could prove to be a way to preserve parathyroid in vivo and thus reduce post-operative hypoparathyroidism rates.

Hypoparathyroidism is the most common complication after a total thyroidectomy surgery. It is most often transient but can sometimes be permanent when it persists for more than 6 months after surgery. The rates are variable, of the order of 32% for transient hypoparathyroidism and 1% for definitive hypoparathyroidism. Untreated permanent hypoparathyroidism is the source of many complications in general and therefore requires lifelong replacement therapy. The result is a significant deterioration in quality of life. The mechanisms responsible for hypoparathyroidism during thyroidectomy are direct damage to the parathyroid glands, involuntary excision of these glands, and devascularization of these glands. The detection of parathyroid glands and the prevention of hypoparathyroidism after thyroidectomy therefore represents a major challenge. The intraoperative use of indocyanine green angiography has recently been described as a reliable means of detecting parathyroid and predicting the risk of postoperative hypoparathyroidism. In addition, prior studies and intraoperative observations suggest that indocyanine green angiography during thyroid surgery may be a means of preserving parathyroid in vivo and thus reducing post-operative hypoparathyroidism rates.