(study 1) Objective: Penetration/Aspiration (P/A) can occur during swallowing. Ingested materials may enter the larynx and remain on the vocal folds. Wet or voice change is one of the indicators for identifying the P/A in clinical evaluation. The pres ...
(study 1) Objective: Penetration/Aspiration (P/A) can occur during swallowing. Ingested materials may enter the larynx and remain on the vocal folds. Wet or voice change is one of the indicators for identifying the P/A in clinical evaluation. The present study was to investigate the feasibility of identifying P/A via acoustic voice parameters. Materials and methods: 165 patients referred to a videofluoroscopic swallowing study (VFSS) were included in the study. The patients were divided into two groups based on the results of VFSS.
P/A group that had the ingested materials on or below the vocal folds was 59 patients
(42 males, 17 females). Non_P/A group that did normal swallowing was 106 patients
(49 males, 57 females). The major cause of swallowing disorders was stroke in the groups. A sustained vowel /a/ for at least 3 seconds was recorded before and after VFSS. Ten acoustic voice parameters were measured using PRAAT, including fundamental frequency (F0), standard deviation of F0, Jitter, relative average perturbation (RAP), Shimmer, amplitude perturbation quotient (APQ), harmonic-to-noise ratio (HNR), noise-to-harmonic ratio (NHR), number of voice breaks (MDVP calls it NUV), and degree of voice breaks (MDVP calls it DVB). Changes of each acoustic voice parameter before and after VFSS between the two groups were compared with repeated measures
mixed ANOVA.
Results:
There were no significant differences in ten acoustic voice parameters before and after
VFSS, whereas RAP was a significant difference before and after VFSS according to
the two groups (P=0.030). The RAP of P/A group decreased from 0.649% before to
0.520% after VFSS. However, The RAP of Non_P/A group increased from 0.311%
before to 0.393% after VFSS. Conclusion: Our results suggest that acoustic voice analysis can detect voice changes after penetration/aspiration (P/A) during swallowing
(study 2) The present study aimed to investigate the changes of acoustic parameters voice in stroke patients. The of the aspirated epiegnhettyr-ateioignh/at sspuirbajteicotns (dPia/Agn)o saendd w56ith cerebro-vascular accident were divided into 32 cNoonnt-roPl /Asu bgjreocutpss paacrctiocripdaintge dt.o the videofluroscopic swallowing study (VFSS) results, and 26 SAilnl cseu bthjeec tvsa rpiraetifoonrm ine dt hVeFSS and vowel /a/ was recorded three times pre- and post VFSS. faocro utshteic apcoaruasmtice teprasr awmiethteinrs a single phonation has been observed, we proposed a delta formula fwrohmich t hcea nv oreicfele cdta ttah ee itgehmt poral changes of the each parameter in an utterance. We measured raecloautsivteic apvaerraamgee tepresr:t ufrubnadtaiomnental frequency (F0), standard deviation of F0 (F0_SD), Jitter, t(oR AhPar)m, oSnhiicm rmaetiro, (aNmHplRit)u.de perturbation quotient (APQ), harmonic to noise ration (HNR), noise uTshienng wthee fsouugngde sptaerda mdeelttears which show the meaningful biggest temporal change in an utterance ppaorsat mVeFteSrS. . ATmhoensge tdheeltmas, tohfe deltas of shimmer and APQ were significantly different pre- and twhaes Pd/eAs caenndd etdh.e Tchoen trvoalr igartioounp were increased after VFSS, while those of the Non-P/A group pwaatste lranrsg eorf. tThhee Pl/aArg aend the control group were similar but the change width of the P/A group cvhaarinagtieosn sin ina ira nr eassipsitraantceed dpuheo ntaotion of the P/A group are thought to be caused by irregular residual food on the vocal cords.