Dong-Hee Lee

Catholic University of Korea, Sŏul, Seoul, South Korea

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Publications (51)61.69 Total impact

  • Dong-Hee Lee
    International journal of pediatric otorhinolaryngology. 05/2014;
  • Dong-Hee Lee
    International Journal of Pediatric Otorhinolaryngology. 01/2014;
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    ABSTRACT: Abstract Conclusion: Intratympanic steroid therapy (IT-S) was as effective as systemic steroid therapy (SST) or combined therapy (CT) and could be considered a first-line therapeutic modality for idiopathic sudden sensorineural hearing loss (SSNHL). Due to its known safety and efficacy, IT-S will be particularly suitable for patients with SSNHL who have chronic diseases such as diabetes mellitus, hypertension, or chronic renal failure. Objectives: Systemic high dose steroid therapy is the main therapeutic modality for SSNHL. Comparable therapeutic efficacies for IT-S and CT with SST and IT-S for SSNHL have been reported recently. We compared the efficacy of IT-S, SST, and CT for treating SSNHL. Methods: A retrospective, multicenter study investigating the therapeutic efficacy of SST, IT-S, and CT for SSNHL was designed and involved 735 patients with idiopathic SSNHL who were diagnosed and treated at seven tertiary referral medical centers of the Catholic University of Korea between 2007 and 2011. Patients were divided into three groups according to the treatment methods they received: IT-S group, SST group, and CT group (SS plus IT-S). Hearing was evaluated by pure tone audiogram performed before initial treatment and at 4 weeks following the final treatment. More than a 10 dB HL decrease in average air conduction threshold of hearing at 500, 1000, 2000, and 3000 Hz was defined as improved hearing. Results: Among 735 patients with SSNHL, 94 were included in the IT-S group, 444 in the SST, and 197 in the CT group. Age, gender, interval from disease onset to start of treatment, and initial hearing level were not different among the three groups. Patients who had concomitant medical disorders such as diabetes mellitus, hypertension, or chronic renal failure were more frequently treated with IT-S. No difference in the level of hearing gain or ratio of hearing improvement was observed among the three groups (p = 0.147 and p = 0.067, respectively).
    Acta oto-laryngologica 01/2013; · 0.98 Impact Factor
  • Dong-Hee Lee, Jisun Kim
    Otolaryngology Head and Neck Surgery 01/2013; · 1.73 Impact Factor
  • Dong-Hee Lee, Jisun Kim
    Dysphagia 01/2013; · 1.94 Impact Factor
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    ABSTRACT: The objectives of this study were to characterize the features of tinnitus in patients with profound sensorineural hearing loss and to evaluate the effect of cochlear implantation (CI) on their tinnitus. Medical records were reviewed for 35 patients who underwent CI, and completed tinnitus questionnaire between March 2003 and August 2011. Of them, 22 had tinnitus prior to CI (62.9 %) and the tinnitus group was older than the non-tinnitus group (47.5 ± 15.1 vs. 28.9 ± 15.2). The mean tinnitus handicap inventory (THI) score of the tinnitus group was 50.5 ± 28.7 before surgery, and the mean THI score and visual analogue scale (VAS) scores for loudness, annoyance, effect on life, and awareness decreased significantly after CI, with a mean follow-up period of 10.7 months. Tinnitus was completely eliminated in ten patients (45.5 %) and THI scores decreased in all patients. In a correlation analysis of the decrease in THI scores, preoperative VAS scores for loudness, awareness, effect on life, and annoyance, as well as preoperative THI scores, were highly correlated with the degree of decrease in THI scores postoperatively. The auditory performance of patients older than 40 years did not differ from that of younger patients, but their tinnitus was more improved after CI. In conclusion, tinnitus is a common complaint in patients with cochlear implants, and is more prevalent in elderly implantees. In the present study, CI improved tinnitus in all patients, although the most severe cases had the greatest benefit.
    Archives of Oto-Rhino-Laryngology 09/2012; · 1.29 Impact Factor
  • Heil Noh, Dong-Hee Lee
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    ABSTRACT: Objectives:  To evaluate the vascularization process of the grafted fascia or perichondrium in active and inactive chronic mucosal otitis media. Design:  Prospective study. Setting:  University-based, secondary referral hospital. Participants:  Two-hundred thirty two patients who underwent type 1 tympanoplasty or myringoplasty by one experienced surgeon. Main outcome measures:  After postoperative days 5 to 7, the graft was inspected using a binocular operating microscope at least twice weekly until vascularization was confirmed to have commenced. This point was defined as the time of vascularization. An intact graft at 3 months postoperatively was considered a closure success. Results:  The mean time of vascularization of 232 grafts was 14.2 ± 3.6 days (range 8-25). The vascularization time differed according to the perforation size. The perforations involving 50% and less of the pars tensa were revascularized earlier than those involving 75% and more. There was no relationship between vascularization time and closure success or failure. Age itself did not influence the vascularization time or the risk of closure failure. Postoperative otorrhea was higher in patients with a preoperative wet middle ear mucosa than among those with a dry one. Conclusion:  The vascularization time was shorter in perforations of 50% and less than those of 75% and more but the rate of closure success was not different between two. The graft failure was not attributed to the failure of vascularization. Age itself seemed not to be a contraindication for myringo-/tympanoplasty in otherwise healthy elderly patients. © 2012 Blackwell Publishing Ltd.
    Clinical otolaryngology: official journal of ENT-UK; official journal of Netherlands Society for Oto-Rhino-Laryngology & Cervico-Facial Surgery 09/2012; · 1.87 Impact Factor
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    Heil Noh, Dong-Hee Lee
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    ABSTRACT: To investigate the electric-acoustic interactions within the inferior colliculus of guinea pigs and to observe how central masking appears in invasive neural recordings of the inferior colliculus (IC). A platinum-iridium wire was inserted to scala tympani through cochleostomy with a depth no greater than 1 mm for intracochlear stimulation of electric pulse train. A 5 mm 100 µm, single-shank, thin-film, penetrating recording probe was inserted perpendicularly to the surface of the IC in the coronal plane at an angle of 30-40° off the parasagittal plane with a depth of 2.0-2.5 mm. The peripheral and central masking effects were compared using electric pulse trains to the left ear and acoustic noise to the left ear (ipsilateral) and to the right ear (contralateral). Binaural acoustic stimuli were presented with different time delays and compared with combined electric and acoustic stimuli. The averaged evoked potentials and total spike numbers were measured using thin-film electrodes inserted into the central nucleus of the IC. Ipsilateral noise had more obvious effects on the electric response than did contralateral noise. Contralateral noise decreased slightly the response amplitude to the electric pulse train stimuli. Immediately after the onset of acoustic noise, the response pattern changed transiently with shorter response intervals. The effects of contralateral noise were evident at the beginning of the continuous noise. The total spike number decreased when the binaural stimuli reached the IC most simultaneously. These results suggest that central masking is quite different from peripheral masking and occurs within the binaural auditory system, and this study showed that the effect of masking could be observed in the IC recording. These effects are more evident and consistent with the psychophysical data from spike number analyses than with the previously reported gross potential data.
    Clinical and Experimental Otorhinolaryngology 09/2012; 5(3):122-31. · 0.88 Impact Factor
  • Dong-Hee Lee, Ji-Hyeon Shin, Dong-Chang Lee
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    ABSTRACT: To evaluate the volumetric relationship between the mastoid air cell (MAC) and paranasal sinus (PNS) in the pediatric population using three-dimensional reconstruction and the analysis technique of CT. Retrospective cross-sectional study was conducted at a university-based, secondary referral hospital. PNS CT imaging data of 62 children (40 boys and 22 girls; mean age=13.4±4.0 years) was reconstructed to the three-dimensional model with the surface-rendering algorithm (lower threshold of -1024HU and upper threshold of -318HU), and subsequently measuring the volume of the three PNSs (frontal, maxillary and sphenoid) and MAC. Hierarchical linear regression analysis was used to control the effect of age. Controlling the effect of age, no significant linear regression relationship was found between the volume of MAC and PNSs. It was observed that PNSs and MAC showed a significant linear relationship with age. The regression slopes of PNSs were larger than that of MAC, especially the growth of maxillary and sphenoid sinuses was faster and larger than that of the frontal sinus and MAC. As the coefficient of determination was extremely small, the aging process itself could not effectively explain the volume variation of PNSs and MAC. No interaction was observed in the pneumatization of the three PNSs (frontal, maxillary, and sphenoid) and MAC. It was found that the growths of PNSs and MAC are influenced by age. Further, maxillary and sphenoid sinuses tend to grow faster and become larger than the frontal sinus and mastoid air cell system. Thus, it is verified that environmental factors could be involved in the postnatal pneumatization process of the PNSs and MAC, which might influence MAC to a greater extent than the PNSs.
    International journal of pediatric otorhinolaryngology 08/2012; 76(11):1642-6. · 0.85 Impact Factor
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    Heil Noh, Dong-Hee Lee
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    ABSTRACT: To investigate acoustic differences between conversational and clear speech of Korean and to evaluate the influence of the gender on the speech clarity using the long-term average speech spectrum (LTASS). Each subject's voice was recorded using a sound level meter connected to GoldWave program. Average long-term root mean square (RMS) of one-third octave bands speech spectrum was calculated from 100 to 10,000 Hz after normalizing to 70 dB overall level using the MATLAB program. Twenty ordinary Korean were compared with 20 Korean announcers with equal numbers of men and women in each group. Compared with the LTASS of ordinary men, that of ordinary women was lower at low frequencies, but higher at 630, 800, 1,600, 5,000, and 10,000 Hz. Compared with the LTASS of male announcers, that of female announcers was lower at low frequencies. Compared with the LTASS of ordinary men, that of male announcers was significantly lower at 100, 125, 200, and 250 Hz. Compared with the LTASS of ordinary women, that of female announcers was lower at 100, 125, 160, 200, 250, 500, and 10,000 Hz. The LTASS of announcer showed lower levels at 100, 200 Hz and higher at 500, 630, 800, and 1,000 Hz that that of ordinary Koreans. This study showed that the drop-off of the LTASS in the low frequency region might make the ratings of women and announcers more clearly than those of men and ordinary persons respectively. This drop-off in the low frequency might result in less upward spread of masking and clearer speech. This study reduced an error resulting from a wide variability of clear speech strategies and intelligibility gains, because this study recruited professional speakers. We hope that our results demonstrate the difference in acoustic characteristics of the speech of ordinary Korean persons.
    Clinical and Experimental Otorhinolaryngology 06/2012; 5(2):68-73. · 0.88 Impact Factor
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    ABSTRACT: To radiologically evaluate the anatomic factors that may determine the view field or the accessibility of the posterior tympanotomy into the posterior mesotympanum, a cohort of 30 patients with pneumatic mastoids and 30 patients with unilateral sclerotic mastoids were included. Anatomic relationships were evaluated according to 5 parameters. The reference parameter of the view field through posterior tympanotomy was the maximum view to the stapes area through posterior tympanotomy. Direct distance between the chorda tympani nerve and the facial nerve (FN) and angle between the cortex of the external auditory canal and the FN showed significant positive correlations in pneumatic and sclerotic mastoids. However, the location of the FN was negatively correlated with the maximum view to the stapes area through posterior tympanotomy only in pneumatic mastoids. In particular, the angle between the cortex of the external auditory canal and the FN showed the best correlation with the maximum view to the stapes area through posterior tympanotomy. The angle between the cortex of the external auditory canal and the FN was the most important anatomic determinant for visibility through posterior tympanotomy. This study suggests that pneumatic mastoids, but not sclerotic mastoids, may have a more complex relationship including more factors than those considered in this study. Although this study was performed radiologically, this study can present the insight to surgeons or radiologists.
    The Journal of craniofacial surgery 05/2012; 23(3):817-20. · 0.81 Impact Factor
  • Heil Noh, Dong-Hee Lee
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    ABSTRACT: To identify the quantitative differences between Korean and English in long-term average speech spectra (LTASS). Twenty Korean speakers, who lived in the capital of Korea and spoke standard Korean as their first language, were compared with 20 native English speakers. For the Korean speakers, a passage from a novel and a passage from a leading newspaper article were chosen. For the English speakers, the Rainbow Passage was used. The speech was digitally recorded using GenRad 1982 Precision Sound Level Meter and GoldWave® software and analyzed using MATLAB program. There was no significant difference in the LTASS between the Korean subjects reading a news article or a novel. For male subjects, the LTASS of Korean speakers was significantly lower than that of English speakers above 1.6 kHz except at 4 kHz and its difference was more than 5 dB, especially at higher frequencies. For women, the LTASS of Korean speakers showed significantly lower levels at 0.2, 0.5, 1, 1.25, 2, 2.5, 6.3, 8, and 10 kHz, but the differences were less than 5 dB. Compared with English speakers, the LTASS of Korean speakers showed significantly lower levels in frequencies above 2 kHz except at 4 kHz. The difference was less than 5 dB between 2 and 5 kHz but more than 5 dB above 6 kHz. To adjust the formula for fitting hearing aids for Koreans, our results based on the LTASS analysis suggest that one needs to raise the gain in high-frequency regions.
    Ear and hearing 05/2012; 33(3):441-3. · 2.06 Impact Factor
  • Heil Noh, Dong-Hee Lee
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    ABSTRACT: The aim of this work was to measure the external auditory canal (EAC) volume in children directly and to analyze its variation according to age and body weight. This was a prospective study at a university-based, secondary referral hospital. Volumes of the bony and cartilaginous EACs were measured using a 1 ml tuberculin syringe filled with 95% ethyl alcohol before inserting ventilation tube(s). Three hundred thirty-eight ears from 194 children (107 boys and 87 girls) were enrolled in this study (mean age=58.8 ± 25.2 months). They were between the 10th and 90th percentiles for age and gender based on the 2007 growth chart for Korean children. EAC volume tended to increase with age. The volumes of cartilaginous and total EACs were significantly larger in boys than in girls. The volume of the bony EAC was significantly larger in right than in left ears. Under the assumption that EAC volume is a linear function of age as well as body weight, these factors explained less than one-third of overall variation. Preferably, the growth of EAC seemed to be not linear with aging in pediatric population. Our cubic model seemed to be more fit to the growth of EAC than simple linear model did and age and body weight alone were not clinically useful predictors of ear canal volume needed for the fitting of hearing aids in pediatric population. Because this variation can result in a large variation of real ear to coupler difference (RECD), this study supports that individual measurement of the RECD is crucial for fitting appropriate hearing aids in children.
    International journal of pediatric otorhinolaryngology 02/2012; 76(5):658-62. · 0.85 Impact Factor
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    ABSTRACT: We performed this study to introduce our minimal supra-auricular approach for the surgical management of a preauricular sinus (PAS) and to evaluate the advantages of this drainless technique. This was a retrospective study. The study was done in a tertiary referral center. We enrolled 94 patients (101 ears) with a PAS who underwent surgical treatment via a minimal supra-auricular approach performed by one surgeon between April 1999 and May 2010. After removing the specimen, meticulous subcutaneous suturing and no drain were used in 83 patients (89 ears) and a postoperative drain was inserted in 11 patients (12 ears). Surgical outcomes of this technique were compared between the groups with and without postoperative drain insertion. With a good surgical view and meticulous subcutaneous mattress sutures in our minimal supra-auricular approach for PAS excision, there was no postoperative recurrence or other serious complication. In the drain group, previous operation history was more frequent (P = .010), and the rate of preoperative infection was higher than in the drainless group (P = .018). Postoperatively, a compression dressing was required more frequently (P = .002) and for longer in the drain group (P = .001). The rate of immediate postoperative wound infection was higher in the drain group (P = .003). Our drainless minimal supra-auricular approach for the surgical removal of a PAS has advantage in terms of good surgical results of no recurrence and is more comfortable for patients because of the reduced need for a compression dressing. We suggest that this technique is effective and safe for PAS excision.
    American journal of otolaryngology 11/2011; 33(4):427-31. · 0.77 Impact Factor
  • Dong-Hee Lee
    International journal of pediatric otorhinolaryngology 09/2011; 76(2):303; author reply 304. · 0.85 Impact Factor
  • Source
    Dong-Hee Lee
    The Laryngoscope 06/2011; 121(6):1348; author reply 1349-50. · 1.98 Impact Factor
  • Chan-Soon Park, Dong-Hee Lee
    Otolaryngology Head and Neck Surgery 07/2010; 143(1):171; author reply 171-2. · 1.73 Impact Factor
  • Dong-Hee Lee
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    ABSTRACT: Objectives To report computed tomography (CT) measurements of lingual tonsil tissue (LTT) in patients with laryngopharyngeal reflux (LPR), obstructive sleep apnea-hypopnea syndrome (OSAHS), both LPR and OSAHS, or neither disease.
    Otolaryngology Head and Neck Surgery 07/2010; 143(1):172-3; author reply 173. · 1.73 Impact Factor
  • Dong-Hee Lee
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    ABSTRACT: Objective To investigate the effectiveness and safety of intratympanic methylprednisolone perfusion (IMP) through a microcatheter in patients with sudden sensorineural hearing loss (SSNHL) who failed a conventional treatment.
    Otolaryngology Head and Neck Surgery 06/2010; 142(6):922-3; author reply 923. · 1.73 Impact Factor
  • Dong-Hee Lee
    Otolaryngology Head and Neck Surgery 06/2010; 142(6):921-2; author reply 922. · 1.73 Impact Factor