Article Figures & Data
Figures
- FIGURE 1.
Axial 18F-FDG PET scans at level of PAC (top, VOI outline in blue) and IC (bottom) in 2 representative patients with left-sided (left image) and right-sided (right image) AHL. Arrows indicate side of decreased metabolism.
- FIGURE 2.
Contralateral glucose metabolism was reduced in IC and in PAC, compared with ipsilateral side (P = 0.003 and P = 0.01, paired t tests). Shown are box plots (red) and individual values (other colors) of glucose metabolism of IC and PAC.
- FIGURE 3.
Longer duration of hearing impairment was associated with higher glucose metabolism of contralateral PAC (r2 = 0.33; P = 0.042).
Tables
Subject Age at scanning (y) Sex Impaired side Visually read asymmetry of metabolism on PET Etiology of AHL Duration of deafness (y) Bone conduction PTA4 (dB HL) Air conduction PTA4 (dB HL) Monosyllabic word recognition at 65 dB SPL (%) Brain stem evoked response audiometry (worse ear) Electrocochleography (worse ear) IC PAC Better ear Worse ear Better ear Worse ear Better ear Worse ear Threshold (dB) Interpeak latency (ms) Sum action potential (ms) Cochlear microphonic (dB HL) 1 35.9 M R Rightward, moderate Rightward, moderate Sudden hearing loss 1.5 2.50 95 6.25 >130 100 0 90 4.3 / / 2 47.8 M R Rightward, moderate Rightward, mild Mumps 45 7.50 >130 16.25 >130 100 0 / / n/d 70 3 40.9 M R Rightward, strong Rightward, strong Fracture of right petrous bone 2.1 3.75 >130 7.5 >130 100 0 / / n/d 100 4 52.4 M L Leftward, strong Leftward, mild Intracochlear schwannoma 12 15 >130 15 >130 100 0 / / n/d 100 5 75.8 M R Rightward, strong Rightward, mild Sudden hearing loss 0.7 20 >130 38.75 >130 80 0 / / n/d 90 6 55.8 F L Leftward, moderate Leftward, moderate Sudden hearing loss 0.8 6.25 >130 11.25 >130 100 0 n/d n/d 0.1 90 7 42.4 M R Rightward, moderate Leftward, mild Mumps 34 0 53.75 2.5 113.75 100 0 / / n/d 110 8 40.0 F L No asymmetry Leftward, mild Unknown 31 32.5 >130 36.25 >130 90 0 / / n/d 100 9 60.1 M R Leftward, mild Rightward, mild Sudden hearing loss 21 41.25 113.75 43.75 113.75 70 0 / / n/d 100 10 58.0 M L Leftward, mild Rightward, mild Mumps 53 25 >130 42.5 >130 45 0 / / n/d 100 11 84.2 M L Leftward, strong Leftward, mild Sudden hearing loss 0.5 35 >130 40 >130 70 0 / / n/d 90 12 55.5 F R No asymmetry No asymmetry Pertussis 48 35 >130 40 >130 45 0 / / / / 13 17.9 F L Leftward, strong Leftward, mild Large aquaeductus vestibuli syndrome 15 12.5 >130 17.5 >130 100 0 / / n/d 100 HL = hearing loss; SPL = sound pressure level; PTA4 = pure tone average at frequencies 0.5, 1, 2, and 4 kHz; n/d = not derivable.
Slash indicates that test was not administered.
