hrvatski

Slušni evocirani potencijali u bolesnika s tumorom pontocerebelarnoga kuta i teškom zamjedbenom nagluhošću

Ipsilateral auditory brain stem responses (ABRs) were analyzed in 86 subjects with tumors of the pontocerebellar angle (PCA). The diagnoses were confirmed by CT, surgery and pathohistologic analses. According to the latencies and waveform changes, the ABRs were classified into seven types. all patients were divided into 4 groups according to PCA tumor size, and into 4 groups according to type of pure-tone audiogram (PTA). The tumor size to be a significant predictor for hearing in large acoustic neurinomas but not in small and medium-size tumors. Eighteen (20, 93%) patients showed ipsilateral ABRs lacking and readable waves (type D response). All of them had significantly poorer hearing sensitivity (more than 60 dB sensorineural hearing loss (SNHL) at 1, 2 and 4 KHz). In combination with ABR monitoring, ECochGproved to be a useful supplementary tool for detecting acoustic neurinomas, especially in patients with severe hearing loss. Electrocochleography (ECochG)and contralateral stimulation are recommended as the methods of choice for making visible crucial waves (l and V) for reliable detection of PCA tumors using ABR in patients with severe hearing loss.

SEP; tumori pontocerebelarnoga kuta; nagluhost

nije evidentirano

engleski

Auditory brain stem responses in patients with pontocerebellar angle tumors and severe sensorineural hearing loss

Ipsilateral auditory brain stem responses (ABRs) were analyzed in 86 subjects with tumors of the pontocerebellar angle (PCA). The diagnoses were confirmed by CT, surgery and pathohistologic analses. According to the latencies and waveform changes, the ABRs were classified into seven types. all patients were divided into 4 groups according to PCA tumor size, and into 4 groups according to type of pure-tone audiogram (PTA). The tumor size to be a significant predictor for hearing in large acoustic neurinomas but not in small and medium-size tumors. Eighteen (20, 93%) patients showed ipsilateral ABRs lacking and readable waves (type D response). All of them had significantly poorer hearing sensitivity (more than 60 dB sensorineural hearing loss (SNHL) at 1, 2 and 4 KHz). In combination with ABR monitoring, ECochGproved to be a useful supplementary tool for detecting acoustic neurinomas, especially in patients with severe hearing loss. Electrocochleography (ECochG)and contralateral stimulation are recommended as the methods of choice for making visible crucial waves (l and V) for reliable detection of PCA tumors using ABR in patients with severe hearing loss.

PCA tumors; severe SNHL; ECochG; modified ABR

nije evidentirano