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2.  Voice evaluation following endoscopic laser CO2 cordectomy and conventional cordectomy  
Introduction
An analysis of long term voice quality outcomes of two different types of surgical intervention for Tis and T1 glottic carcinoma: laryngofissure conventional cordectomy and endoscopic laser CO2 cordectomy, with or without additional radiation therapy.
Material and methods
Total of 46 patients with Tis and T1 glottic carcinoma served as subjects. All have been treated surgically with laryngofissure conventional cordectomy (32.61%) or endoscopic laser CO2 cordectomy (67.39%). The surgeries were performed in the Department of Otolaryngology at the Medical University of Warsaw (1990-2004). The presented voice assessments were made at least 3 years following the surgery, in between January 2006 and February 2007.
Results
In patients after the endoscopic laser CO2 cordectomy the following findings are more often observed: the unrestrained voice production, wider range of Fo in a spoken sentence, longer maximum phonation time, better intensity of phonation for normal and loud speaking, lower degree of hoarseness based on the Yanagihara’s classification, and the lower VHI. No significant influence of the performed additional radiotherapy on voice parameters was found.
Conclusions
Patients after endoscopic laser CO2 cordectomy, compared to laryngofissure conventional cordectomy, present better voice quality. The amount of the excised vocal fold tissue, which in our study was slightly larger in case of the conventional cordectomy, could account for the results mentioned above. This may also be explained by the necessity of the anterior thyrotomy, which is required for conventional cordectomy via external approach, and often results in anterior synechia and level difference between the neocord and the contralateral vocal fold.
doi:10.5114/aoms.2011.20621
PMCID: PMC3258680  PMID: 22291748
glottic carcinoma; voice quality; spectrography; acoustic analysis of voice
3.  Videolaryngoscopic and videostroboscopic evaluation following laser CO2 and conventional cordectomy of Tis and T1 glottic carcinoma 
Introduction
This paper is an analysis of long-term functional results, observed on videolaryngoscopic and videostroboscopic examination, of two different types of surgical intervention for Tis and T1 glottic carcinoma: laryngofissure conventional cordectomy and endoscopic laser CO2 cordectomy, with or without additional radiation therapy (using 60Co).
Material and methods
A total of 46 patients with Tis and T1 glottic carcinoma, 43 men (93.48%) and 3 women (6.52%), served as subjects. All were treated surgically with laryngofissure conventional cordectomy (15 patients, 32.61%) or endoscopic laser CO2 cordectomy (31 patients, 67.39%). The procedures were performed in the Department of Otolaryngology at the Medical University of Warsaw between November 1990 and February 2004. Videolaryngoscopic and videostroboscopic examinations were conducted a minimum of 3 years after the surgery, between January 2006 and February 2007. The appearance of the neocord (the scar after cordectomy), scar or synechia formation in the anterior commissure, movements of the vocal folds on respiration and phonation, difference in level between the neocord and the normal vocal fold, glottic closure, phonation type, and ventricular folds hyperfunction were examined. The symmetry of vocal fold vibrations, regularity of vibrations, glottic closure, amplitude of vibrations, and mucosal wave were also evaluated.
Results
In our study, the videolaryngoscopic and videolaryngostroboscopic examination showed a significantly higher occurrence of the following findings in patients after endoscopic laser cordectomy: phonation at the glottic level, complete glottic closure, and a tendency to vibration of the neocord on phonation.
Conclusions
Ventricular hyperfunction on phonation and scar or synechia formation in the anterior commissure were observed statistically more frequently in patients after laryngofissure conventional cordectomy.
doi:10.5114/aoms.2010.14478
PMCID: PMC3284081  PMID: 22371810
glottic closure; ventricular hyperfunction; anterior commissure; vocal fold vibrations; mucosal wave

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