EchoLab

Sistema per Otoemissioni Acustiche

TEOAE – DPOAE – Spontanee

ABR Screening

Maurizio Brugnaro

1. Screening protocolli NHS (Newborn Hearing Screening) Prima e Sec. Fase: TEOAE o DPOAE con PASS/REFER

Terza fase: ABR con identificazione NV

2. Clinical OAE protocols:

DPOAE

TEOAE

SOAE

Suppression test con mascheramento contralaterale

LCD display con grafico OAE ed Analisi3. Barcode inserimento dati automatico (opz.)4. Memoria interna 250 test

5. Programmabile via PC con software Audiologic6. Audiologic

Database

Creazione e modifica protocolli

Statistiche e mail-marge

Maurizio Brugnaro

DPOAE – distortion products in response to 2 frequency stimuli (f1/f2) Calibration Presentation of paired stimuli, as per test protocol RESULTS:

DPOAE DP-Gram

TEOAE – transient OAE in response to click stimuli Calibration and display Click stimuli, at rate and intensity as pre-set in test protocol RESULTS:

Spectrum Analysis

Newborn ABR latencies and CNS maturationNewborn ABR latencies and CNS maturation

Newborn waveformsdiffer from normaladult ABR

Normal newbornNormal newbornABR ResponseABR Response1.1. PeaksPeaks• Seldom NI• No NIII• NV is present2.2. Longer latenciesLonger latencies• NV around 7 ms3.3. Inter-peakInter-peak

latency NI-NVlatency NI-NV• 3.8 to 4.5 ms

Newborn ABRNewborn ABRclears doubtful OAEclears doubtful OAEResults Results –– Phase 3. Phase 3.In case of persistingdoubts, clinical ABRwill be performedas early as possible.

Newborn skinresistance is muchhigher.

Criticalrecordingconditions.

• The new probe tipnew probe tip, especiallydesigned for newborn testing, isslimmer than the standard conic tip.

• The exclusive newborn ear tipsexclusive newborn ear tipsmade of soft silicon have provensuccessful in testing newborns.

• Four sizes allow sealing even thesmaller newborn ear canals.

• Minute silver electrodeshave been especiallydeveloped for newborn ABRtesting.

• The pre-jelled electrodes,with non allergic adhesive,are disposable.