Audiological findings in Noonan syndrome.
OBJECTIVE
The aim of this study was to evaluate audiologic properties of patients with Noonan syndrome and compare these findings with those of unaffected peers.


METHODS
The study included 17 children with Noonan syndrome and 20 typically developing children without Noonan syndrome. Pure tone and speech audiometry, immitancemetric measurement, otoacoustic emissions measurement and auditory brainstem response tests were applied to all (n = 37) children.


RESULTS
Hearing thresholds of children with Noonan syndrome were higher (poorer) than those observed unaffected peers, while the hearing sensitivity of the both groups were normal limits (p = 0.013 for right, p = 0.031 for left ear). Transient evoked otoacoustic emissions amplitudes of the children with Noonan syndrome were lower than the children without Noonan syndrome (p = 0.005 for right, p = 0.002 for left ear). Middle ear pressures and auditory brainstem response values were within normal limits and there was no difference between the two groups (p > 0.05).


CONCLUSIONS
General benefit of the present study is to characterize the audiologic findings of children with Noonan syndrome, which is beneficial in clinics evaluating children with Noonan syndrome.
Department of Audiology, Faculty of Health Sciences, Hacettepe University, Ankara, Turkey. Electronic address: sunatokgoz@yahoo.com.
Suna
S
Tokgoz-Yilmaz
Department of Audiology, Faculty of Health Sciences, Hacettepe University, Ankara, Turkey.
Meral Didem
MD
Turkyilmaz
Pediatric Genetics, Faculty of Medicine, Ankara University, Ankara, Turkey; Dr. John Macdonald Foundation Department of Human Genetics, Miller School of Medicine, University of Miami, Miami, USA.
Filiz Basak
FB
Cengiz
Department of Audiology, Faculty of Health Sciences, Hacettepe University, Ankara, Turkey.
Alev Pektas
AP
Sjöstrand
Biostatistics Department, Faculty of Medicine, Ankara University, Ankara, Turkey.
Serdal Kenan
SK
Kose
Dr. John Macdonald Foundation Department of Human Genetics, Miller School of Medicine, University of Miami, Miami, USA.
Mustafa
M
Tekin
D000293:Adolescent; D001301:Audiometry, Pure-Tone; D001302:Audiometry, Speech; D001309:Auditory Threshold; D016022:Case-Control Studies; D002648:Child; D004432:Ear, Middle; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D034381:Hearing Loss / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D008297:Male; D009634:Noonan Syndrome / Q000150:complications / Q000503:physiopathology*; D017084:Otoacoustic Emissions, Spontaneous; D010641:Phenotype; D011312:Pressure
Hearing loss; Noonan syndrome; Transient otoacoustic emissions