Clinica de Oido, Nariz y Garganta - Dr. Marco Gallardo

MADSEN Capella Cochlear Emissions Analyzer


The Capella system combines three types of otoacoustic emissions (OAE) testing with screening tympanometry and infant hearing screening in one portable PC-based system.


  • Distortion Product OAE, Transient Evoked OAE and Spontaneous OAE tests
  • Lightweight probe for all measurements
  • NOAH-based software for integrating OAE data with other audiologic test data
  • Echo-Screen TEOAE infant screening module
  • Screening tympanometry module with both 226 Hz and 1000 Hz probe tones
  • Battery version and carrying case for complete portability

The complete diagnostic OAE system - both for the clinic and for portable use

Running under Windows and NOAH, Capella is easy to navigate and offers all the convenience of screen dumps, color printers, online help, etc. With features like user-defined tests, auto sequences and on-screen comparison of measurements, Capella offers the most sophisticated and powerful OAE software available today.

Measurement data is stored in the patient’s NOAH file together with other audiologic test data and it can be exported for use in other databases, e.g. Microsoft’s Access.

The Capella hardware unit weighs only 4 lbs. (1.8 kg) and fits easily under a notebook PC. It is also available in a battery-powered version for total portability.

Modular structure offers fully flexible configurations

The Capella system can be configured according to your requirements. The hardware unit comes in two versions, one with integral battery and one with air pressure pump for tympanometry. The software may be run on any PC with NOAH pre-installed.

Because Capella is software-based and modular, you can choose only those testing options you require now and add more later. Each testing mode is offered as a separate application module in the form of software and accessories.

The following software application modules may be freely combined to suit your individual requirements:

  • Distortion Product OAE
  • Transient Evoked OAE
  • Both OAE modules include a mode for measurement of Spontaneous OAEs
  • Screening Tympanometry
  • Echo-Screen TEOAE screening

Applications of OAE testing

The detection of OAEs has proved to be a useful addition to the audiologic test battery with a number of different applications:
Monitoring of cochlear damage caused by ototoxic medication or by noise exposure.
Differential diagnosis: the sensitivity of OAEs in measuring cochlear function is useful for distinguishing sensory from neural hearing loss.
Objective diagnosis of hearing loss in infants.

Diagnostic follow-up of infants referred from hearing screening programs

Because of the ease and objective nature of OAE measurement, it is perfectly suited to the assessment of newborn hearing and has become an integral part of the test battery for diagnosis of hearing loss in infants referred from newborn hearing screening programs. In fact, many national and state health organizations mandate the use of OAE or ABR in follow-up applications.

Middle-ear screening

There is also growing acceptance for the need to combine middle-ear evaluation with OAE screening and testing of babies it is evident that even small obstructions to the mobility of the conductive system in the middle ear can extinguish an OAE response, regardless of the condition of the outer hair cells. Further, a number of studies have shown that tympanometry with a 1000 Hz probe tone produces significantly better results with infants under the age of 6 months.

Consequently, it is important to be able to measure using both techniques in sequence, preferably with the same probe. Today, only GN Otometrics’ Capella has this capability.


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