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<p>Benign laryngeal lesions such as vocal cord polyps, nodules, cysts, and Reinke’s edema are common causes of dysphonia. These lesions impair glottic efficiency, affecting vocal quality and endurance. Two non-invasive aerodynamic parameters—S/Z ratio and Maximum Phonation Time (MPT)—serve as reliable indicators of vocal function and therapeutic outcomes. To evaluate the changes in S/Z ratio and MPT following microlaryngeal surgery in patients with benign laryngeal lesions and to analyze lesion-specific outcomes. This prospective, comparative follow-up study was conducted at a tertiary care centre from January 2024 to June 2025. Eighty patients aged 18–70 years with benign laryngeal lesions underwent microlaryngeal surgery. S/Z ratio and MPT were recorded preoperatively and at 8 weeks postoperatively. A pathology-wise comparison was also performed. The mean pre-treatment S/Z ratio decreased significantly from 1.19± 0.43 to 0.96± 0.38 postoperatively (<i>p</i> &lt; 0.00001), indicating improved glottal efficiency. MPT improved significantly from 8.61± 3.68 to 12.52± 3.13&#xa0;s (<i>p</i> &lt; 0.00001), reflecting enhanced phonatory endurance. Among different pathologies, vocal cord polyps showed the greatest improvement in MPT (13.10± 3.1&#xa0;s). All subgroups demonstrated reduced S/Z ratios, confirming surgical benefit across lesion types. Microlaryngeal surgery significantly enhances both glottic efficiency and phonatory capacity in benign laryngeal lesions. The S/Z ratio and MPT are reliable, simple, and effective parameters for objective assessment of vocal function before and after surgical intervention. Pathology-specific analysis aids in prognostication and tailoring post-operative voice rehabilitation.</p>

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Aerodynamic Assessment of Vocal Cord Function Using S/Z Ratio and MPT: A Hospital Based Study

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Gopika Kalsotra,
  • Danish Majeed Lone,
  • Advaita Sharma,
  • Himanshu Sharma,
  • Aditiya Saraf

摘要

Benign laryngeal lesions such as vocal cord polyps, nodules, cysts, and Reinke’s edema are common causes of dysphonia. These lesions impair glottic efficiency, affecting vocal quality and endurance. Two non-invasive aerodynamic parameters—S/Z ratio and Maximum Phonation Time (MPT)—serve as reliable indicators of vocal function and therapeutic outcomes. To evaluate the changes in S/Z ratio and MPT following microlaryngeal surgery in patients with benign laryngeal lesions and to analyze lesion-specific outcomes. This prospective, comparative follow-up study was conducted at a tertiary care centre from January 2024 to June 2025. Eighty patients aged 18–70 years with benign laryngeal lesions underwent microlaryngeal surgery. S/Z ratio and MPT were recorded preoperatively and at 8 weeks postoperatively. A pathology-wise comparison was also performed. The mean pre-treatment S/Z ratio decreased significantly from 1.19± 0.43 to 0.96± 0.38 postoperatively (p < 0.00001), indicating improved glottal efficiency. MPT improved significantly from 8.61± 3.68 to 12.52± 3.13 s (p < 0.00001), reflecting enhanced phonatory endurance. Among different pathologies, vocal cord polyps showed the greatest improvement in MPT (13.10± 3.1 s). All subgroups demonstrated reduced S/Z ratios, confirming surgical benefit across lesion types. Microlaryngeal surgery significantly enhances both glottic efficiency and phonatory capacity in benign laryngeal lesions. The S/Z ratio and MPT are reliable, simple, and effective parameters for objective assessment of vocal function before and after surgical intervention. Pathology-specific analysis aids in prognostication and tailoring post-operative voice rehabilitation.