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Anatomic Variations in Temporal Bones Affect the Intensity of Nystagmus During Warm Caloric Irrigation.

Publication ,  Journal Article
Patki, AU; Ronen, O; Kaylie, DM; Frank-Ito, DO; Piker, EG
Published in: Otol Neurotol
September 2016

HYPOTHESIS: Anatomic variables within the mastoid will correlate with intensity of caloric responses. BACKGROUND: During caloric irrigation, heat is transferred from the external auditory canal to the lateral semicircular canal (LSCC) through aerated mastoid bone. Temporal bone airspace volume and bone volume vary widely but the effect of this variation on caloric irrigation testing is not well characterized. Understanding this effect is necessary to understand how mastoid surgery may alter caloric irrigation results. METHODS: Twenty-two mastoid airspace and bones, as well as LSCC, were reconstructed from computed tomography scans of 11 subjects with normal anatomy who underwent vestibular function evaluation. Respective surface area (SA) and volume (V) of the mastoid airspace, bones, LSCC, and distance from LSCC to tympanic membrane (LSCC-TM) were calculated. In addition, computed values from these anatomic structures were correlated with the maximum velocity of slow phase nystagmus during warm caloric irrigation (MVwarm). RESULTS: Our results showed that the combined effect of airspace SA:V, bone SA:V, LSCC SA:V, and LSCC-TM distance accounted for 69.5% of the variation in MVwarm. Airspace SA:V (R = 0.22) and LSCC SA:V (R2 = 0.02) positively correlated with MVwarm, while bone SA:V (R = 0.17) demonstrated an inverse correlation with MVwarm. CONCLUSION: Preliminary results from this pilot study suggest that a substantial amount of the variability in MVwarm can be explained by temporal bone anatomy. Results also indicate that the denser the bone, the more heat is transferred to the LSSC, whereas increased airspace serves as an insulator. A larger study is necessary to confirm our findings.

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Published In

Otol Neurotol

DOI

EISSN

1537-4505

Publication Date

September 2016

Volume

37

Issue

8

Start / End Page

1111 / 1116

Location

United States

Related Subject Headings

  • Tomography, X-Ray Computed
  • Temporal Bone
  • Semicircular Canals
  • Pilot Projects
  • Otorhinolaryngology
  • Nystagmus, Pathologic
  • Male
  • Humans
  • Female
  • Caloric Tests
 

Citation

APA
Chicago
ICMJE
MLA
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Patki, A. U., Ronen, O., Kaylie, D. M., Frank-Ito, D. O., & Piker, E. G. (2016). Anatomic Variations in Temporal Bones Affect the Intensity of Nystagmus During Warm Caloric Irrigation. Otol Neurotol, 37(8), 1111–1116. https://doi.org/10.1097/MAO.0000000000001129
Patki, Aniruddha Uday, Ofri Ronen, David Marcus Kaylie, Dennis Onyeka Frank-Ito, and Erin Gillikin Piker. “Anatomic Variations in Temporal Bones Affect the Intensity of Nystagmus During Warm Caloric Irrigation.Otol Neurotol 37, no. 8 (September 2016): 1111–16. https://doi.org/10.1097/MAO.0000000000001129.
Patki AU, Ronen O, Kaylie DM, Frank-Ito DO, Piker EG. Anatomic Variations in Temporal Bones Affect the Intensity of Nystagmus During Warm Caloric Irrigation. Otol Neurotol. 2016 Sep;37(8):1111–6.
Patki, Aniruddha Uday, et al. “Anatomic Variations in Temporal Bones Affect the Intensity of Nystagmus During Warm Caloric Irrigation.Otol Neurotol, vol. 37, no. 8, Sept. 2016, pp. 1111–16. Pubmed, doi:10.1097/MAO.0000000000001129.
Patki AU, Ronen O, Kaylie DM, Frank-Ito DO, Piker EG. Anatomic Variations in Temporal Bones Affect the Intensity of Nystagmus During Warm Caloric Irrigation. Otol Neurotol. 2016 Sep;37(8):1111–1116.

Published In

Otol Neurotol

DOI

EISSN

1537-4505

Publication Date

September 2016

Volume

37

Issue

8

Start / End Page

1111 / 1116

Location

United States

Related Subject Headings

  • Tomography, X-Ray Computed
  • Temporal Bone
  • Semicircular Canals
  • Pilot Projects
  • Otorhinolaryngology
  • Nystagmus, Pathologic
  • Male
  • Humans
  • Female
  • Caloric Tests