Ear injury as the only manifestation of amyloidosis

Evaluation of hearing in pediatric familial Mediterranean fever patients during attack period and attack-free period

OBJECTIVES

Familial Mediterranean fever (FMF) is the most common monogenic autoinflammatory disease worldwide. It usually has a childhood onset and is characterized with recurrent attacks with irregular intervals. Few studies have been performed to investigate hearing in FMF patients ran with various tests and showed different results. In this study, first time in the literature, we aimed to evaluate and compare auditory functions in pediatric FMF patients during the attack periods and attack-free periods to see the possible effects of autoinflammation that was caused by FMF attacks.

METHODS

40 pediatric FMF patients (80 ears) enrolled in the study as study group and 21 matching (42 ears) healthy children as a control group. Blood samples were taken from patients who presented clinical attack symptoms. Control group and FMF patients that were in attack period underwent audiometric evaluation including pure tone audiometry (0.25, 0.5, 1, 2, 4, 8 kHz) and Distortion product otoaoustic emission (DPOAE) (1, 1.4, 2, 2.8, 4 kHz) test. The tests were repeated in attackfree period. Correlations between hearing results and C-reactive protein, erythrocyte sedimentation rate levels, duration of disease, age at disease onset, colchicine usage time, cumulative dosage of colchicine and the number of attacks in the last six months were studied.

RESULTS

Hearing thresholds of FMF patients, compared to control group, were found to be increased at most frequencies. Lower signal/noise ratios (SNR) were detected at most frequencies in the DPAOE test. In the attack period compared to attack-free period, hearing thresholds in the audiometry were found to be increased at some frequencies (p < 0.05). However, this was not supported by the DPOAE test. In correlation analysis, increased colchicine usage time and colchicine cumulative dosage were associated with decreased thresholds in audiogram and increased SNR values in DPOAE. Detailed statistical analyses of all parameters were included in the study.

CONCLUSION

Results demonstrated cochlear involvement in FMF patients. Acute changes in hearing thresholds in the attack period may be suggesting the effect of acute inflammation on cochlea. The difference between the audiometry and otoacoustic emission test results of FMF patients and healthy controls suggests the cumulative effect of recurrent inflammation attacks on cochlea. Positive affect of treatment of the disease with long term colchicine in hearing were also demonstrated.

The evaluation of cochlear functions in Familial Mediterranean Fever

Familial Mediterranean Fever (FMF) is a progressive disease characterized by chronic inflammation, which also has negative effects on cochlear functions and hearing levels. We investigated whether the cochlear functions and hearing levels of FMF patients were different than healthy controls and also evaluated the relationship of hearing levels with the age at diagnosis, duration without treatment, and inflammation and lipid parameters in this study. A total of 60 patients diagnosed with FMF and 48 age, gender and body mass index (BMI)-matched healthy controls were included in the study. The hemogram, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), and lipid parameters of the subjects were studied and they all underwent pure tone audiometry and Transient evoked otoacoustic emission tests after an otologic examination. The hearing levels of the FMF group were significantly higher than those of the control group. The TEOAE signal/noise (S/N) ratios were similar in both groups. A positive relationship was present between the audiometric test results and the age, BMI, low-density lipoprotein and triglyceride levels and a negative relationship with the high-density lipoprotein levels. A negative relationship was present between the TEOAE S/N ratios and the age of the patients, duration without treatment, lipid parameters, inflammation markers and the creatinine level. FMF patients are exposed to chronic inflammation and this can influence their hearing levels. The age at diagnosis, duration without treatment, chronic inflammation, unfavorable lipid parameters, and obesity can affect hearing tests negatively.