Significant Factors Affecting the Operation Time for Benign Parotid Tumor

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  • Kanazawa Takeharu
    Department of Otolaryngology, Jichi Medical University, Saitama Medical Center
  • Ohta Yasushi
    Department of Otolaryngology, Jichi Medical University, Saitama Medical Center
  • Goutsu Kazuo
    Department of Otolaryngology, Hasuda Hospital
  • Takeoda Katsuji
    Department of Otolaryngology, Hasuda Hospital
  • Tsubaki Keiju
    Tsubaki ENT Clinic
  • Kodama Kozue
    Department of Otolaryngology, Jichi Medical University, Saitama Medical Center
  • Inoue Rika
    Department of Otolaryngology, Jichi Medical University, Saitama Medical Center
  • Usubuchi Hajime
    Department of Otolaryngology, Jichi Medical University, Saitama Medical Center
  • Iino Yukiko
    Department of Otolaryngology, Jichi Medical University, Saitama Medical Center

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Other Title
  • 耳下腺良性腫瘍の手術時間に影響を与える因子
  • ジカセン リョウセイ シュヨウ ノ シュジュツ ジカン ニ エイキョウ オ アタエル インシ

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Abstract

Tumors of the parotid gland are fairly frequent among head and neck tumors. Parotidectomy for benign tumors is necessary for diagnosis and therapy. Furthermore, acquiring the skill for this operation is a significant step in the training course of an otolaryngologist. Thus, it is useful to analyze the operation time and determine the factors affecting it to evaluate the progress in the operation skill. To measure the operation time and determine the factors affecting it, 71 cases, including 43 cases of pleomorphic adenomas and 28 cases Warthin's tumor, were retrospectively reviewed to the determine if the operation time depended on the age, sex, operated side, presence of complications, BMI, bleeding volume, tumor size, tumor location, exposure of branches of the facial nerve, and experience of the surgeon. Multivariate analysis was used to determine the factors correlated with the operation time. The results revealed that the bleeding volume, tumor size, tumor location and experience of the surgeon were significantly correlated with the operation time, whereas age, sex, operated side, presentation of complications and BMI showed no correlation with the operation time. Furthermore, surgeons with the experience of operating 20-39 cases took almost the same time for the operation as the surgeon with the experience of operating more than 40 cases. Taken together, to shorten the operation time, the inexperienced surgeon should start with smaller tumors and surgery in the superficial lobe in the initial training period, and supervision by well-experienced supervised surgeons is required until 30-40 are undertaken.

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