The endoscopic instruments used in the stapes operation caused a temperature increase in the oval window. The authors concluded that this heat could easily be transmitted to the cochlea by the perilymph, which has obstructed contact with the outer environment following stapedomy, resulting in neurosensorial damage.

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The endoscopic instruments used in middle ear surgery caused the temperature of the round window to rise. The rise varied with endoscope diameter and the type of light source used.

The perforation size affects the success of tympanic membrane (TM) reconstruction, in addition to the surgical technique used. Large TM perforations present a surgical challenge. The perforation size has been reported to be a prognostic factor, and poorer results are obtained with large versus small perforations. We aimed to evaluate patients who had undergone tympanoplasty for large perforations at our clinic using either the underlay or overunderlay technique and to compare the results in terms of re-perforation, retraction, lateralization, and improvement of hearing. Of 302 patients with chronic otitis media, 114 who had a perforation that involved over 50 % of the pars tensa were enrolled in the study. The underlay technique was used in 61 patients, and the over-underlay technique in 53 patients. In the underlay group, the preoperative mean perforation size was 30.11 ± 5.35 mm 2 (range 20.00-52.00 mm 2 ) (n = 61). In the over-underlay group, the preoperative mean perforation size was 31.41 ± 8.65 mm 2 (range 22.00-48.00 mm 2 ) (n = 53). The graft success rate of tympanoplasty performed using the underlay technique was 89.1 % in 61 patients. Seven (10.9 %) patients had graft failure. The graft success rate with the over-underlay technique in 53 patients was 90.5 %. Five (9.5 %) patients had graft failure in this group. Three graft lateralizations (5.6 %) and two retractions (3.8 %) were observed at 12 months postoperatively in the over-underlay group. However, in the underlay group, no graft lateralization but five retractions (8.2 %) were observed at 12 months. The graft-take rates and hearing improvement results in both groups were successful and compatible with those in the literature.

Aim To investigate the mean platelet volume (MPV) in asymptomatic children infected with COVID‐19. Methods The study included 55 children infected with COVID‐19 and 60 healthy children for the comparison of leukocyte and thrombocyte count, MPV and serum C‐reactive protein (CRP) levels. Demographic data and clinical findings of all the participants were recorded, including age, gender, weight, temperature, cough, shortness of breath and contact history. Results The MPV values were determined to be statistically significantly high ( P < .001) and the lymphocyte values were significantly low (p:0.002) in the asymptomatic children infected with COVID‐19 compared with the healthy control children. No difference was determined between the groups in respect of CRP level, leukocyte and thrombocyte counts ( P > .05). The optimal cutoff point for MPV was determined as 8.74 fl (Area under the curve—AUC:0.932) with 81.82% sensitivity and 95% specificity for the determination of children infected with COVID‐19. A cutoff value of <2.12/mm 3 for lymphocytes (AUC:0.670) was determined with 49.09% sensitivity and 86.67% specificity for the prediction of COVID‐19. Based on the ROC analysis, the sensitivity and specificity of MPV were determined to be higher than that of lymphocyte levels. Conclusion The results of this study indicate that MPV levels are significantly high in asymptomatic children infected with COVID‐19 demonstrate that this is an important predictive value and has better predictive capacity than lymphocyte values. The evaluation of MPV and lymphocyte levels together could increase diagnostic success in asymptomatic COVID‐19 patients.