Maico Ero Scan Pro Operating Instructions Manual

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Maico Ero Scan Pro Operating Instructions Manual Manual pdf 22 page image

Operating Instructions195.5 Understanding the Acoustic Reflex Display & ResultDuring the measurement of the acoustic reflex the change of thecompliance is represented on the instrument display as shown to theleft. The zero-line at the bottom of the graph indicates the measuredcompliance without a test sound. Changes in compliance are shownas deviations from the zero-line. If a Stapedial reflex occurs, thecompliance increases and the curve rises. The change in compliance isshown for each intensity level for the stimulus being presented.When the test is finished a summary display will show the finalcompliance change curve for each stimulus presented in the protocol.Above each curve the test stimulus type is indicated by the following:500 = 500 Hz pure-tone BN = Broadband noise1k = 1,000 Hz pure-tone LP = Low pass noise2k = 2,000 Hz pure-tone HP = High pass noise4k = 4,000 Hz pure-toneThe stimulus type is followed by a yes/no indication that thecompliance change reached the selected criteria to consider the reflexpresent. A compliance change meeting or exceeding the selectedcriteria is indicated by a  symbol (default criteria is 0.05 ml) followedby the stimulus intensity (in dB HL) where the Stapedial reflex wasmeasured. A compliance change failing to meet the criteria isindicated by a  symbol followed by the maximum intensity level.The overall test outcome is indicated by PASS or REFER in the upperright corner of the display. This is determined by the pass criteriaestablished for the protocol. See Appendix B for additionalinformation on default protocols.A correct interpretation of the measuring results can only follow in connection with the tympanogram,the graphic reflex display (to rule out artifact) and other actual data. But in principle a Stapedial reflexindicates that the patient hears on the “stimulus ear” and that the sound lead functions.Note: the acoustic reflex measurement is automatically conducted with pressure held at peakcompliance (compensated).