Publication date: Available online 2 November 2018
Source: Journal of Voice
Author(s): Hamide Ghaemi, Ali Dehqan, Behrooz Mahmoodi-Bakhtiari, Ronald C. Scherer
Abstract
Objective
This study aimed to evaluate the vocal changes in the Iranian pregnant women according to trimesters both objectively and subjectively.
Methods
There were 93 pregnant women and 31 non-pregnant women participants in the study. Thirty-three of the 93 pregnant women were in their first trimester, 31 in their second trimester, and 29 in their third trimester of their pregnancies. Clinical data were collected from the acoustic measurements, aerodynamic assessment, video laryngoscopy examination, and the self-assessment of quality of life related to voice using the Persian Voice Handicap Index (VHIP). The analysis of variance (ANOVA) test and Kruskal–Wallis test were used for between-group comparisons of the data.
Results
Decreased maximum phonation time (MPT), increased S/Z ratio, increased VHIP-30 scores, and evidence of vocal fold edema were the parameters that differed significantly only in the third trimester. Acoustic analysis revealed that F0, jitter, shimmer, and noise-to-harmonics ratio (NHR) were not significant across the four groups.
Conclusions
Results showed that decreased MPT, increased S/Z ratio, mild to moderate edema, and a deterioration of the VHIP-30 score noticeably occurred during the third trimester. The results suggest significant vocal changes toward less stable phonation during the third trimester of pregnancy.
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