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Rinne test

rinne test, rinne test positive
The Rinne test /ˈrɪnə/ RIN is a hearing test, primarily for evaluating loss of hearing in one ear unilateral hearing loss1 It compares perception of sounds transmitted by air conduction to those transmitted by bone conduction through the mastoid Thus, one can quickly screen for the presence of conductive hearing loss

A Rinne test should always be accompanied by a Weber test to also detect sensorineural hearing loss and thus confirm the nature of hearing loss

The Rinne test was named after German otologist Heinrich Adolf Rinne 1819–1868;23 the Weber test was named after Ernst Heinrich Weber 1795–1878

Contents

  • 1 Procedure
  • 2 Results
    • 21 Normal hearing
    • 22 Abnormal hearing
  • 3 Air vs bone conductive hearing loss
  • 4 Limitations
  • 5 References
  • 6 External links

Procedureedit

The Rinne test is performed by placing a high frequency 512 Hz vibrating tuning fork against the patient's mastoid bone and asking the patient to tell you when the sound is no longer heard Once they signal they can't hear it, quickly position the still vibrating tuning fork 1–2 cm from the auditory canal, and again ask the patient to tell you if they are able to hear the tuning fork

The effect on the opposite ear, relative to the tuning fork, is reverse to the ear being tested Here, conduction through the skull to the opposite side is more effective than conduction through room air around the head Thus, if the normal ear is not maskedclarification needed, bone conduction could be reported as louder by the patient, even if both ears are normalclarification needed

Resultsedit

Normal hearingedit

  • Air conduction should be greater than bone conduction and so the patient should be able to hear the tuning fork next to the pinna outer ear after they can no longer hear it when held against the mastoid

Abnormal hearingedit

  • If they are not able to hear the tuning fork after the mastoid test, it means that their bone conduction is greater than their air conduction This indicates there is something inhibiting the passage of sound waves from the ear canal, through the middle ear apparatus and into the cochlea ie, there is a conductive hearing loss
  • In sensorineural hearing loss the ability to sense the tuning fork by both bone and air conduction is equally diminished, implying they will hear the tuning fork by air conduction after they can no longer hear it through bone conduction This pattern is similar to what is found in people with normal hearing, but patients with sensorineural hearing loss will indicate that the sound has stopped much earlier This can be revealed by the investigator with normal hearing placing the fork close to their own ear after the patient indicates that the sound has subsided, noting that the sound from the fork is still loud and clear to a normal ear

Air vs bone conductive hearing lossedit

Air conduction uses the apparatus of the ear pinna, eardrum and ossicles to amplify and direct the sound whereas bone conduction bypasses some or all of these and allows the sound to be transmitted directly to the inner ear albeit at a reduced volume, or via the bones of the skull to the opposite ear

Description Relative Positive/negative
In a normal ear, air conduction AC is better than bone conduction BC AC > BC this is called a positive Rinne

Note that the words positive and negative are used in a somewhat confusing fashion here, as compared to their normal use in medical tests Positive or negative in this case means that a certain parameter that was evaluated was present or not In this case, that parameter is whether air conduction AC is better than bone conduction BC Thus, a "positive" result indicates the healthy state, in contrast to many other medical tests Therefore, some prefer to avoid using the term 'positive' or 'negative', and simply state if the test was normal or abnormal eg 'Rinnes test was abnormal in the right ear, with bone conduction greater than air conduction'

Rinne Weber
AC > BC lateralizes to left no lateralization lateralizes to right
left right left ear right ear both ears left ear right ear
Normal Sensorineural loss Normal Sensorineural loss Normal
Sensorineural loss
Conductive loss Normal Combined loss Normal
Normal Combined loss Normal Conductive loss
Conductive loss Combined loss Conductive loss Combined loss Conductive loss
Combined loss = conductive and sensorineural loss

Limitationsedit

This test and its complement, the Weber test, are quick screening tests and are no replacement for formal audiometry Recently, its value as a screening test has been questioned4

The Rinne test is not reliable in distinguishing sensorineural and conductive loss cases of unilateral severe or total sensorineural loss In such cases, bone conduction to the contralateral normal ear will be better than air conduction resulting in a false negative In such a case, the Weber test will, however, show signs of lateralization, implying some kind of pathology Formal audiometry testing would be required if any abnormal result is presented

Referencesedit

  1. ^ Thijs C, Leffers P January 1989 "Sensitivity and specificity of Rinne tuning fork test" BMJ 298 6668: 255 PMC 1835543  PMID 2493884 doi:101136/bmj2986668255 
  2. ^ synd/2447 at Who Named It
  3. ^ F H A Rinne Beiträge zur Physiologie des menschlichen Ohres Vierteljahrsschrift für die praktische Heilkunde, Prague, 1855, 45: 71-123
  4. ^ Bagai A, Thavendiranathan P, Detsky AS January 2006 "Does this patient have hearing impairment" JAMA 295 4: 416–28 PMID 16434632 doi:101001/jama2954416 

External linksedit

  • Tuning Fork Tests - Family Practice Notebook Retrieved February 3, 2007

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Rinne test


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    Rinne test beatiful post thanks!

    29.10.2014


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