Nao Hiwatashi

Osaka Red Cross Hospital, Ōsaka, Ōsaka, Japan

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Publications (3)3.33 Total impact

  • No preview · Article · Jan 2010 · Japanese Journal of Head and Neck Cancer
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    ABSTRACT: This retrospective study examined the etiology and treatment results for traumatic, conductive hearing loss in 22 patients who underwent surgery between 1998 and 2008 at Osaka Red Cross Hospital. All patients underwent computed tomography (CT) of the temporal bone preoperatively. The ear surgery comprised closure of the ruptured tympanic membranes and restoration of the sound-transmitting function of the ossicular chain. Their mean age was 30.3 years, and the average delay from injury until treatment was 6.0 years. Of the injuries due to foreign-body insertion, the most common cause was ear-pick injury. Incudostapedial disarticulation was the most common finding, which was diagnosed preoperatively using CT in seven cases and identified at surgery in 15 cases. Closure of the air-bone gap to within 10 and 20 dB was observed in 50.0 and 68.2% of the patients, respectively. The hearing threshold improved by 10 dB or more in 16 (72.7%) patients. If no improvement in hearing loss follows the absorption of hemotympanium or closure of an eardrum perforation, dislocation of the ossicular bones should be suspected. Ossicular reconstruction following trauma produces more stable and better hearing results, even after delayed treatment.
    No preview · Article · Nov 2009 · Archives of Oto-Rhino-Laryngology
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    ABSTRACT: To present the clinical results of closing chronic tympanic membrane (TM) perforations using basic fibroblast growth factor (bFGF) combined with an atelocollagen/silicone bilayer membrane patch. Closure of TM perforations in 87 patients was attempted using bFGF, which is thought to promote the regeneration of TM tissues by facilitating the growth of fibroblasts and collagen fibers. Under an operating microscope, the margin of the perforation was trimmed, and a piece of an atelocollagen/silicone bilayer membrane was placed in the perforation with the silicon layer facing outward and then infiltrated with 0.1 ml of trafermin. Data obtained from patient records included patient age, perforation size, and duration of treatment, with a focus on hearing improvement and complete TM closure. The mean perforation size before treatment was 14.4%. Complete closure of the TM perforation was achieved in 80 patients (92.0%), whereas pinholes remained in 5 patients (8.7%), and small perforations were observed in 2 patients (2.3%). In the patients with complete closure, the TM perforations closed after an average 1.8 treatments, and hearing improved by 13.6 dB. This study demonstrated that bFGF combined with atelocollagen is effective for the conservative treatment of TM perforation.
    No preview · Article · Nov 2009 · Otology & neurotology: official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology