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Related Experiment Video

Updated: May 17, 2026

Effects of Surgical Masks on Cardiopulmonary Function in Healthy Subjects

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Published on: February 12, 2021

Changes in ventilatory function following surgery for bilateral abductor paralysis.

C J Sharan¹, S Bahadur, K K Handa

¹Department of ENT & Head and Neck Surgery, All India Institute of Medical Sciences, New Delhi, India.

Indian Journal of Otolaryngology and Head and Neck Surgery : Official Publication of the Association of Otolaryngologists of India

|November 3, 2012

Summary

This summary is machine-generated.

Surgical management of bilateral vocal fold immobility can be assessed using flow volume loops. Peak inspiratory flow rate (PIFR) and forced inspiratory flow (FIF(50)) improved in most patients after surgery, aiding airway and voice balance.

Keywords:

Bilateral abductor paralysis Pulmonary function tests Vocal cord paralysis

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Area of Science:

Otolaryngology
Pulmonology
Surgical Outcomes Assessment

Background:

Bilateral vocal fold immobility presents a surgical challenge, requiring a balance between airway patency and voice preservation.
Objective assessment tools are crucial for evaluating surgical success in managing this condition.

Purpose of the Study:

To evaluate the utility of flow volume loop parameters, specifically peak inspiratory flow rate (PIFR) and forced inspiratory flow at 50% of vital capacity (FIF(50)), in assessing surgical outcomes for bilateral vocal fold immobility.

Main Methods:

Retrospective review of 17 patients undergoing surgical treatment for bilateral vocal fold immobility.
Surgical procedures included laser posterior cordectomy with partial arytenoidectomy, endoscopic arytenoidectomy, and posterior cordectomy (Kashima's technique).
Flow volume loops were used to measure PIFR and FIF(50) pre- and post-operatively.

Main Results:

Twelve out of 17 patients (70.6%) were successfully decannulated post-surgery.
Significant improvements in mid-inspiratory and peak inspiratory flow rates were observed in most patients.
Mean increase in FIF(50) was 0.44 l/sec (52.6%) and mean increase in PIFR was 0.41 l/sec (39.77%).
No statistically significant difference in inspiratory flow rate improvement was noted among the different surgical techniques.

Conclusions:

Flow volume loop parameters, PIFR and FIF(50), are effective objective measures for assessing surgical success in bilateral vocal fold immobility.
Surgical intervention generally leads to improved inspiratory airflow, facilitating decannulation.
The study did not find significant differences in outcomes between the evaluated surgical procedures regarding inspiratory flow improvement.