Gland Preservation Research Articles

Serum Intact Parathyroid Hormone Level After Total Thyroidectomy or Total Thyroidectomy Plus Lymph Node Dissection for Thyroid Nodules: Report From 296 Surgical Cases

BackgroundTransient hypocalcemia is one of the postoperative complications of thyroidectomy for thyroid nodules, and intraoperative and postoperative intact parathyroid hormone (iPTH) assays are used to predict postoperative hypocalcemia.ObjectivesThe current study was conducted to evaluate a single serum iPTH measurement on postoperative day 1 (POD 1) as a means to predict hypocalcemia occurrence after total thyroidectomy (TT).Patients and MethodsThe subjects consisted of 36 patients who underwent TT and 260 patients who underwent TT plus lymph node (LN) dissection for thyroid nodules treatment. The TT performance procedure to prevent postoperative hypoparathyroidism combines parathyroid gland preservation in situ with autotransplantation of resected or devascularized parathyroid glands. The patients’ serum iPTH level was measured on POD 1, and their serum calcium level was measured on POD 1 and on POD 3 while they were still inpatients. The serum iPTH level was subequently measured at each outpatient clinic visit until it recovered to the normal range.ResultsHypoparathyroidism after TT and TT plus LN dissection was ultimately diagnosed in a total of 229 patients, and in 69 of them hypocalcemia was diagnosed on POD 1. All of the 69 patients diagnosed with hypocalcemia received calcium and vitamin D supplementation therapy. The serum iPTH level of 67 of 229 patients was within normal range on POD 1, and four of them developed hypocalcemia on POD 1. Permanent hypoparathyroidism developed in 37 of 296 patients after undergoing TT or TT plus LN dissection for thyroid nodules in the hospital.ConclusionsA single serum iPTH measurement on POD 1 is useful to determine whether or not to start calcium and vitamin D supplementation in order to maintain normocalcemia after surgery.

Comparison of Parathyroid Gland Preservation Rates between Open and Endoscopic Total Thyroidectomy for Papillary Thyroid Carcinomas

Comparison of Parathyroid Gland Preservation Rates between Open and Endoscopic Total Thyroidectomy for Papillary Thyroid Carcinomas

Feasibility of submandibular gland preservation in neck dissection: A prospective anatomic-pathologic study

Feasibility of submandibular gland preservation in neck dissection: A prospective anatomic-pathologic study

Intraoperative parathyroid hormone as an indicator for parathyroid gland preservation in thyroid surgery

Intra-operative parathyroid hormone (PTH) levels have successfully been used to assess surgical ablation of parathyroid adenomas, the use of this same test to predict preservation of viable gland has not been widely used. to test the sensitivity and specificity of intraoperative rapid PTH assay test in predicting permanent postoperative hypoparathyroidism, and applicability to guide the search for inadvertently removed parathyroid glands for possible auto transplantation. 52 patients undergoing total thyroidectomy for non-malignant thyroid diseases were included. Intraoperative rapid PTH assay test was performed. If levels were reduced, or less than 3 parathyroid glands were detected, removed thyroid gland was examined for unintentionally removed parathyroid tissue for possible auto transplantation. There was a strong correlation between intraoperative rapid PTH assays and those taken 24 hours after surgery, 16 out of 52 patients had reduction of the PTH intraoperatively to levels below 25 pg/ml, of them, 11 patients (who had values between 15-24 pg/ml) recovered to normal PTH levels within 4 weeks, while the 5 patients with intraoperative PTH levels below 15 pg/ml failed to regain normal PTH levels up to 12 weeks postoperatively, even in those patients where parathyroid tissue was auto transplantated. The 4 patients who had parathyroid tissue reimplanted intraoperatively restored some of their parathyroid function as indicated by relative rise of their PTH levels, but did not reach even the low normal levels. (ROC) curve for prediction of early hypoparathyroidism using intraoperative rapid PTH assay was statistically highly significant with optimal cutoff value for predicting early hypocalcaemia level <27 pg/ml, (sensitivity 100%, specificity 68.2%). (ROC) curves for predicting permanent hypoparathyroidism using intraoperative rapid PTH assay or standard PTH assay taken 24 hours after surgery were statistically significant with optimal cutoff value PTH level <12 pg/ml on the intraoperative PTH curve or <15 pg/ml on the postoperative PTH curve (sensitivity 100%, specificity 100%). Intraoperative PTH assay may allow intraoperative monitoring of parathyroid function, predicting postoperative outcomes, may identify patients at risk of developing postoperative hypoparathyroidism, guiding surgeons to re-examine removed specimens for inadvertently removed parathyroid tissue with possible auto transplantation, or more practically a guide to early replacement therapy to prevent hypocalcaemia, leading to safe and early hospital discharge. Limitations in our study to be reconsidered in further studies, are relative small sample size, inability for randomisation, and the variable values reported for the cut off value of PTH causing hypocalcaemic symptoms needing intervention.

Endoscopic-Assisted Gland-Preserving Therapy for Chronic Sialadenitis&lt;subtitle&gt;A German and US Comparison&lt;/subtitle&gt;

To determine whether unique patterns of care are evolving in the United States compared with Germany in endoscopic management of chronic sialadenitis. Comparison of consecutive series of patients. Academic tertiary salivary referral centers in Germany and the United States. A total of 446 patients having chronic sialadenitis treated with salivary endoscopy. To compare practice patterns and outcomes at each location, databases tracking patients having chronic sialadenitis treated with salivary endoscopy were searched for the following variables: age, sex, involved gland, radiographic studies, endoscopic findings, endoscopic-related complications, gland preservation rate, patient symptom control, and techniques for managing salivary stones and intraductal scar tissue. Significantly more patients in the US cohort had chronic sialadenitis of the parotid gland (P = .03) and multiple gland involvement (P < .001). Salivary endoscopy was regularly performed using local anesthesia in Germany and using general anesthesia in the United States (P < .001). Endoscopic-related complication rates were higher (10.9% vs 1.6%) and gland preservation rates lower (85.9% vs 98.4%) among US patients; however, patients with intact glands demonstrated similar rates of symptom control at both centers (92.7% in the United States vs 85.3% in Germany) at the last follow-up visit. The lower rate of gland preservation in the United States is largely because of lack of access to lithotripsy for larger salivary stones. Different patterns of care are emerging in the endoscopic management of chronic sialadenitis in the United States compared with Germany, where these techniques were largely developed. Nevertheless, patients with chronic sialadenitis at both locations who undergo endoscopic gland-preserving therapy have high rates of gland preservation and symptom control.

Endoscopic‐assisted management of chronic sialadenitis

Chronic sialadenitis is a relatively common disorder that is frequently referred to head and neck surgeons for diagnosis and management. The management of the disorder is rapidly evolving with the introduction of salivary endoscopy. The purpose of the present study was a review of the indications and techniques of endoscopic-assisted management of chronic sialadenitis at a single U.S. institution. This study is a retrospective case series of patients undergoing salivary endoscopy for chronic sialadenitis. Patient clinical information was reviewed to determine endoscopic findings, associated procedures, complications, rate of gland preservation, and early symptom control. A total of 51 patients underwent endoscopic-assisted salivary surgery over a 24-month period. Treatment indications included sialadenitis of unclear etiology (49%), sialadenitis with sialolithiasis (47%), and Sjögren syndrome (4%). Findings included obstructive stricture formation in 22 patients (43%). Associated procedures included sialodochoplasty (41%), steroid infusion (39%), and ductal stenting (8%). Gland preservation was achieved in 40 patients (78%). Of those who were treated with endoscopic-assisted techniques alone, 38 patients (84%) had symptomatic improvement whereas 7 patients (16%) did not improve. Minor complications were observed in 12% of the patients. Endoscopic-assisted management of chronic sialadenitis is both safe and effective and allows gland preservation with symptom control in the majority of patients.

Outcome and relative cost of transoral removal of submandibular calculi

To examine the outcomes and treatment cost of transoral removal of submandibular calculi, and to compare the outcomes and costs of other reported techniques. Retrospective review of 60 consecutive patients undergoing transoral removal of submandibular calculi. All clinical, operative, post-operative and follow-up data were collated and outcomes analysed. A total of 61 submandibular glands were treated by the transoral approach. Patients with multiple stones (p = 0.034) and stones in the proximal submandibular duct (p = 0.0028) were at greater risk of requiring submandibular gland excision, compared with patients with single stones and stones in the distal duct, respectively. There was a significant difference between the gland preservation rate during the first versus the second half of the study (p = 0.028). Larger calculi were significantly more likely to be seen in the proximal duct (p < 0.001). The mean operating time (28 minutes) and length of hospital stay for transoral removal of submandibular calculi was much less than those for other treatment techniques.

Robotic‐assisted transoral removal of a submandibular megalith

The majority of salivary stones are less than 8 mm in size and most frequently occur in the submandibular gland. Traditional management of larger stones involves gland resection. Sialendoscopy combined with an external or a transoral sialolithotomy, also called the combined approach technique, permits stone removal and gland preservation. A 31-year-old male presented to our service with a 20-mm megalith in the left submandibular gland. Here we report the first description of a combined approach using the da Vinci Si Surgical System to facilitate transoral stone removal and salivary duct repair.

Feasibility of Preservation of the Submandibular Gland During Neck Dissection in Patients With Early-Stage Oral Cancer

The impact of submandibular gland (SMG) preservation during neck dissection on the survival of patients with early-stage oral squamous-cell carcinoma (OSCC) remains undocumented. The medical records of all patients with early-stage OSCC (stage I and II) who underwent wide excision of the primary tumor and simultaneous neck dissection between 1999 and 2006 at our facility were retrospectively reviewed. We analyzed 408 patients, including 33 patients with and 375 patients without SMG preservation. The 5-year disease-free and overall survival rates were 78.8% and 90.9% for the patients with SMG preservation and 75.4% and 90.4% for the patients without SMG preservation, and these differences were not statistically significant (P=0.79, P=0.99, respectively). Similar survival rates between patients with and without SMG preservation were observed in those with oral tongue squamous-cell carcinoma (SCC) and with buccal SCC. Patients with T2 OSCC with SMG preservation had significantly lower 5-year disease-free survival rate than those without SMG preservation (P=0.02), but overall survival rates were similar between these two groups. Preservation of the SMG during neck dissection may be oncologically safe in patients with T1 OSCC, but the feasibility of SMG preservation seems less clear for T2 OSCC.

Management of giant sialoliths: Review of the literature and preliminary experience with interventional sialendoscopy

To report our experience with management of giant salivary stones via a combined approach technique using salivary endoscopy (CA) and results of a review of current literature related to giant salivary stones. Retrospective case series. An institutional review board-approved chart review was performed on patients managed with a CA to treat giant salivary stones (≥15 mm). In addition, we reviewed the English literature from 1942 to 2009. Table 1 consists of 54 stones; 47 of which were identified during the review of literature and 7 from our case series. Of those 47 stones, 23 were hilar in location, 23 were glandular in location, and 1 stone was missing data. The gland preservation rate in the 47 reported stones was 57% (17/30). Among patients where gland resection was reported, the majority of the patients (12/13) had hilar glandular stones. Only one patient with a ductal stone had a gland resection. In our series, CA enabled a gland preservation rate of 86% (6/7). Among these patients, stone location was hilar glandular in six (86%) and ductal in one (14%). The mean size of stones from the literature review was 35 mm and from our series was 19 mm. Our review reflects current treatment recommendations for giant stones, i.e., transoral sialolithotomy for ductal stones and gland resection for hilar glandular stones. Our preliminary experience with CA for giant stones suggests improved gland preservation rates (86% vs. 57%) independent of stone location and with preservation of salivary function.

Feasibility of submandibular gland preservation in neck dissection: A prospective anatomic‐pathologic study

The submandibular gland is commonly removed during neck dissection involving sublevel IB. However, removal reduces basal salivary secretion and therapeutic options for minimizing xerostomia. The purpose of this study was to determine whether all lymph nodes in sublevel IB can be extirpated without removing the submandibular gland. Twenty consecutive patients undergoing 33 neck dissections were prospectively enrolled. Sublevel IB dissection was performed by 3 sequential steps: (1) removal of targeted lymph node groups (preglandular and postglandular, prevascular and postvascular), (2) removal of submandibular gland, and (3) removal of residual lymphoadipose tissue in the surgical bed. Complete removal of lymph nodes in sublevel IB was achieved before excising the submandibular gland in all of the 30 eligible neck dissections. The submandibular gland and the surgical bed contained no residual lymph nodes. In suitable cases, it is technically feasible to remove all lymph nodes in sublevel IB and preserve the submandibular gland.

Parathyroid gland preservation and selective autotransplantation utilizing topical lidocaine in total thyroidectomy

To review a new technique during total thyroidectomy that facilitates parathyroid gland preservation and selective autotransplantation utilizing topical 2% plain lidocaine as a spasmolytic/vasodilator agent. Retrospective case series review at a university hospital. The study population comprised 100 consecutive patients (84 women and 16 men; mean age, 52 years) undergoing total thyroidectomy from January 2007 to December 2008. Interventions were: parathyroid glands (PGs) with signs of devascularization treated with a topical solution of 2% plain lidocaine in an attempt to restore blood flow before committing to autotransplantation. The main outcome measure was the incidence of hypoparathyroidism. A total of 40 parathyroid glands were autotransplanted. None of the 100 patients developed permanent hypoparathyroidism. There were no adverse effects utilizing this technique. In our experience, the use of lidocaine spasmolysis is a useful technique in thyroid surgery for salvaging devascularized PGs. Its utility as a selection method for PG autotransplantation incurs minimal risk or cost and might further reduce the incidence of permanent hypoparathyroidism. Further study is warranted.

Endoscopic hemithyroidectomy with prophylactic ipsilateral central neck dissection via an unilateral axillo-breast approach without gas insufflation for unilateral micropapillary thyroid carcinoma: preliminary report

Recently, various endoscopic approaches have been applied to thyroid surgery. However, few specific data exist on endoscopic thyroidectomy with central neck dissection (CND) for micropapillary thyroid carcinoma. This study aimed to evaluate the feasibility and safety of endoscopic hemithyroidectomy (HT) plus CND. In this study, 29 consecutive patients underwent endoscopic HT with ipsilateral CND via a unilateral axillo-breast approach (endo group), and 30 matched control patients underwent conventional open HT with ipsilateral CND (open group). The following variables were compared between these two groups: perioperative complications, surgery-related outcomes, and pathologic outcomes. The operating time in the endo group was longer than in the open group (p = 0.012). In terms of parathyroid gland (PTG) preservation, there were no statistically significant differences between the two groups. The mean numbers of dissected central lymph nodes and metastatic central lymph nodes were similar in the two groups (p = 0.506 vs. 0.975). The endo group had a significantly longer mean hospital stay (6.21 +/- 0.94 days) than the open group (4.30 +/- 1.02 days; p = 0.000). No significant difference was observed in the overall perioperative complications between the two groups. This study demonstrates that the endoscopic approach of CND plus HT is feasible for selected unilateral, intrathyroidal, micropapillary carcinomas. In the future, prospective and comparative studies on the surgical techniques of total thyroidectomy and CND are needed to verify their oncologic safety.

Incidence and patterns of regional metastasis in early oral squamous cell cancers: Feasibility of submandibular gland preservation

We aimed to study the incidence of metastasis to the submandibular gland (SMG) and to establish the oncologic basis of SMG preservation in early-stage cancer of the oral cavity (OSCC). This was a retrospective study of 261 patients with OSCC treated primarily with surgery at a tertiary medical center. One hundred thirty-two early-stage (T1-2, N0) OSCCs were further analyzed. The mean age was 59 years with male-to-female sex ratio of 1.4:1. Two hundred sixty-one neck dissections were performed with SMG removal in 253 patients. One patient with an advanced floor of mouth cancer had obvious infiltration of the SMG. Only 2.5% (3 of 116) patients with early-stage OSCC had level I metastasis; none had SMG metastases. SMG preservation in early cancers (T1-2, N0) of the oral cavity should be feasible unless there is evidence of direct invasion of the gland or close proximity of the cancer to it.

Does autoimmune thyroid disease affect parathyroid autotransplantation and survival?

While the increased risk to parathyroid gland preservation has long been recognized during surgery for thyroid cancer, the effect of different benign pathological conditions on parathyroid preservation has not previously been reported. The aim of this study was to examine parathyroid viability in relation to autoimmune thyroid disease. This is a retrospective cohort study including all patients having an initial total thyroidectomy (TT) performed by this unit during the period 2004-2005. A total of 628 patients underwent TT in the study period. For the Graves' disease cases, 45 (62.5%) required the autotransplantation of one or less parathyroid gland, whereas 27 (37.5%) required two or more glands to be autotransplanted. This was significantly higher than for the benign thyroid disease group in which the respective figures were 242 (77.6%) and 70 (22.4%) (P= 0.01). Of the lymphocytic thyroiditis cases, 61 (65.5%) required the autotransplantation of one or less gland, whereas 32 (34.4%) required the autotransplantation of two or more glands. This was also significantly higher (P= 0.03). Temporary hypocalcaemia was significantly higher when two or more glands were autotransplanted (23 out of 177, 13.2%) than one or less gland autotransplanted (18 out of 451, 4.0%, P < 0.01). However, the overall incidence of permanent hypoparathyroidism was 1.0%, and there was no significant difference between the groups. TT performed for Graves' disease and lymphocytic thyroiditis results in the autotransplantation of more parathyroid glands, leading to a higher incidence of temporary hypocalcaemia post-operatively. Despite this, the incidence of permanent hypoparathyroidism remains low at 1%.

Parathyroid Gland Preservation in situ versus Total Parathyroidectomy with Autotransplantation in Patients at Risk of MEN2A

Parathyroid Gland Preservation in situ versus Total Parathyroidectomy with Autotransplantation in Patients at Risk of MEN2A

Prophylactic thyroidectomy in pediatric carriers of multiple endocrine neoplasia type 2A or familial medullary thyroid carcinoma: mutation in C620 is associated with Hirschsprung's disease

Purpose Prophylactic total thyroidectomy is now recommended after having confirmed RET mutations in children of parents with multiple endocrine neoplasia type 2 or familial medullary thyroid carcinoma. We reviewed our experience to determine the incidence of medullary thyroid carcinoma with respect to age at surgery, the location of the mutation, and its association with Hirschsprung's disease (HD). Methods A retrospective review from 1996 to 2005 revealed 20 children with genetic screening for multiple endocrine neoplasia type 2A or familial medullary thyroid carcinoma who underwent a prophylactic total thyroidectomy with parathyroid gland preservation. Results The median age of the 20 patients (9 boys and 11 girls) included in this study was 8.2 years (range, 3.7-16.9 years) at the time of their surgery. Final pathology revealed normal thyroid tissue (n = 3; median age, 5.9 years), C-cell hyperplasia (n = 13; median age, 10 years), or medullary thyroid carcinoma (n = 4; median age, 8 years). Four children, all with mutations in C620, had a previous diagnosis of HD. At a median follow-up of 3.7 years (range, 1 month to 8.4 years), all patients were well and cancer free. Conclusions There is no correlation between histologic findings and median age at surgery. Hirschsprung's disease was found in 50% of the patients with the RET mutation in C620. In children of C620 parents, symptoms of HD should be actively sought, and if such are found, rectal biopsies should be performed even if mutation results are not yet available. Based on the age of the earliest cancer and the safety of total thyroidectomy, children should promptly undergo surgery after genetic screening and before their fifth year of life.

Reconstruction of the Palate Following Removal of Palatal Salivary Gland Tumors

take miniaturized baskets and forceps for retrieval of stones under direct vision. To complement these developments new surgical techniques have been developed to retrieve stones by leaving a functioning gland intact. Used in combination these techniques can reliably relieve obstruction of salivary glands by stone or stricture and provide an alternative to gland excision for obstructive disease. Experience with gland preserving techniques in a series of 455 patients indicates that in at least 76% of cases stones and obstructions can be eradicated and only 2% of patients required gland removal. This is a radical deviation from current practice. A further advantage is that many of the techniques used in this series can be performed under local anesthetic or on an outpatient basis with low morbidity. The intra-oral removal of submandibular stones can also be undertaken under local anesthetic for appropriate patients but most stones are retrieved on a day case basis under general anesthetic. The scintigraphy results suggest that although gland function improves following treatment it does not return to normal values. However there is accumulating data to show significant gland regeneration following obstruction and with a medium follow-up of 4 years there is no evidence that patients are developing chronic sialoadenitis. Our results as well as others suggest that the optimum management of salivary obstruction should focus on gland preserving techniques.

Feasibility of Nerve-Sparing Prostate Cryosurgery: Applications and Limitations in a Canine Model

In a canine model, we evaluated the feasibility of nerve-sparing cryosurgery by active warming of the neurovascular bundle (NVB). Furthermore, our aim was to determine if NVB warming increases the risk of acinar gland and stromal-tissue preservation in adjacent areas of the prostate. The effects of a single versus double freeze-thaw cycle on prostate tissue were also assessed. Ten prostate lobes from five dogs were evaluated. Nine lobes from five dogs were treated with cryoablation using 17-gauge gas-driven cryoneedles. Seven lobes wre treated with active warming of the NVB using helium gas, and two lobes were treated without active warming. A single or double freeze-thaw cycle was utilized. Prostate tissue ablation and NVB preservation were evaluated in histologic sections. All seven prostate lobes treated with active warming demonstrated complete or partial NVB preservation. Four of these lobes had adjacent gland preservation. All lobes treated with a double freeze-thaw cycle showed complete and uniform ablation of prostate tissue. One of the three lobes treated with a single freeze-thaw cycle demonstrated incomplete ablation of the tissue. This is the first study investigating the feasibility of NVB preservation under controlled experimental conditions. In our canine model, NVB preservation with active warming was possible but not consistently reproducible. In some cases, NVB preservation with active warming may result in incomplete peripheral tissue ablation. A double, but not a single, freeze-thaw cycle induces complete and effective necrosis of prostatic tissue. These results have significant clinical applications when attempting nerve-sparing cryosurgical ablation of the prostate.

Prophylactic treatment reduces the severity of xerostomia following radiation therapy for oral cavity cancer.

Hypothesis: The underlying mechanism of irradiation-induced injury to the salivary glands was an enigma for French radiobiologist Jean Bergonie, who first described the phenomenon in 1911. Bergonie was also the scientist who characterized as “radiosensitive” tissues that, like hematological stem cells, are composed of primitive, undifferentiated cells with a high mitotic rate; and yet he was aware that salivary cells, which are highly differentiated (especially serous acinar cells), and have a low mitotic rate, are particularly radiosensitive. The enigma has not been solved and xerostomia still causes much discomfort. Annually, irradiation-induced xerostomia affects between 30000 and 50000 individuals treated for head and neck cancer in the United States alone. Since irradiation-induced xerostomia was first described, much research has been devoted to understanding the mechanism of its development. This is due, in part, to its appeal as an enigma; additionally, there is no adequate therapy for its prevention or treatment. The delivery of therapeutic radiation was greatly improved during the last decade, mainly through 3-dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiation therapy (IMRT). These technologies allow high rates of salivary gland preservation in head and neck–irradiated patients, but they are either unavailable or insufficient for too many of them. Irradiation damage occurs because of the location of the glands (symmetrical and extended), the extent of the tumors, and the high doses of radiation that are often indicated. Can one expect that, in the near future, prophylactic treatment will reduce the severity of xerostomia following radiation therapy for oral cavity cancer?