Effect of Hot Steam Inhalation on Microcirculation of Nasal Mucosa

이정권,김현웅,김성식,박현중,윤주헌 대한비과학회 2000 Journal of rhinology Vol.7 No.2

Background and Objectives:Nasal inhalation of hot humidified air may alleviate nasal symptoms associated withrhinologic disease. Thus, hot steam inhalation is often recommended as a home remedy for various nasal disorders such as thecommon cold and allergic rhinitis. But the mechanism of its effect is not fully known and correct guidelines for implementinghot steam inhalation have not been settled. We studied microcirculation of nasal mucosa using the nasal Laser DopplerFlowmetry (LDF) in ten healthy subjects in order to evaluate normal physiologic reactions to hot steam. Material andMethods:10 healthy volunteers inhaled hot steam (about 42℃) 10 times, 20 times, 30 times, 50 times and 100 times respectively. Nasal LDF was then performed using a Peiflux 4001 (Perimed, Jartalla, Sweden) and the microcirculatory parametersperfusion, velocity, and concentration were each recorded at base line immediately, 15 minutes, 30 minutes, 60 minutes, 90minutes and 120 minutes after hot steam inhalation. Result:Microcirculatory perfusion was highest at 15 minutes after hotsteam inhalation regardless of how many times inhalation occurred. It was found that at 15 minutes, there was a significantincrease of microcirculatory perfusion in subjects inhaling 50 times and 100 times (p<0.05). But, at 120 minutes, significantincrease of microcirculatory perfusion was only seen in subjects inhaling 100 times (p<0.05). Conclusion:After inhalation ofhot steam, an increased microcirculatory perfusion of nasal mucosa was registered. Up to inhaling of 100 times, it leads toeffective increasement of microcirculation of nasal mucosa.

Laser Resection of Palatopharynx on the Snorers

이정권,윤주헌,김경수,김광문,최진우,최재진 대한비과학회 1995 Journal of rhinology Vol.2 No.1

Recently, a new method for treating snoring, called laser resection of palatopharynx (LRPP) was developed and we were to evaluate the clinical effect of of LRPP on the snorers. The subjects of this study were 537 patients who were operated on from June, 1993 through June, 1994 at Severance Hospital. The operations were done with CO₂ laser (Sharplan Co. Israel) and applicators as 20 watts and continuous mode. We evaluated the snorers in three different ways : I.assessment of subjective symptoms II.psychodynamic analysis done by psychiatrist III.assessment of subjective satisfaction by patient’s evaluation. The improvement oI snoring was obtained in 76.4% and of irregular respiration in 80.5%. The symptom of mouth dryness was improved in 54.5% and headache in 28.7%. In psychodynamic analysis, insomnia was noted in 20.7% and was improved significantly after the operation but depression didn’t show any significant improvement. The improvement of subjective satisfaction was the greatest in 4th week (84.4%) and decreased on the progress of follow-up. The most common intraoperative problem was bleeding (9.3%) and the most common postoperative complication was foreign body sensation (32.1%). LRPP had some advantages of an outpatient based operation with local anesthesia and little complications and is an effective method to lessen snoring and irregular respiration. However, the long term follow-up will be needed to determine its full effect.

Correlations between Findings of Polysomnography and Sleep Apnea Symptoms

이정권,김경수,최진우,박인용,이성훈 대한비과학회 1995 Journal of rhinology Vol.2 No.2

We were to evaluate the correlations between the sleep apnea symptoms consisted of insomnia, excessive sleepiness during daytime, impaired cognitive functions and emotional disturbances and various parameters of sleep and respiration on polysomnography. In sixty patients with sleep apnea, sleep and respiration were examined by polysomnography of one night, and symptoms of sleep apnea were evaluated with the scales of insomnia, daytime sleepiness, emotional disturbance and cognitive impairment. We studied correlations between apnea symptoms, and various parameters of sleep and respiration such as sleep efficiency, number and severity of apnea, O₂ desaturation and number of snoring. Patients with better sleep in insomnia scale showed more number of apnea, particularly more central type, and much more snoring in stage 3 sleep and mild desaturation of O₂. Excessive sleepiness during daytime correlated significantly with stage 1 sleep and its snoring, but correlated negatively with stage 2 sleep.. However, no significant correlation was found with degree of O₂ desaturation. Emotional disturbance was more apparent in the patients with severe O₂ desaturation and smaller amounts of stage 4 sleep. Cognitive function was more impaired in cases of more REM sleep and less apnea. Symptoms of sleep apnea may occur through different causes and processes. The evaluation of apnea symptoms may be helpful to understand in some degree the condition of sleep and respiration during sleep in clinical setting.

Determination of Referral Criteria of Polysomnography by Clinical Symptoms of Snorers

이정권,김경수,윤주헌,박인용,이성훈 대한비과학회 1995 Journal of rhinology Vol.2 No.2

Most of patients with snoring have underlying obstructive sleep apnea. Operations for snoring through uvulopalatopharyngoplasty (UPPP) or laser resection of palatopharynx (LRPP) are known to be effective in treatment of snoring but less in obstructive sleep apnea. Therefore polysomnography (PSG) should be recommended in order to evaluate sleep apnea in patient with snoring. However, it is not easy to recommend PSG to all patients with snoring in practice. We performed this study to find the criteria of referral for polysomnography before operation of snoring. 140patients with snoring and sleep apnea syndrome were studied by the PSG. Sleep apnea questionnaire, Zung’s scale for depression, Stanford Sleepiness Scale (SSS), insomnia scale and neuropsychological test were administered. And also, blood pressure, height, weight and neck circumference were measured and some history was taken. Correlations between respiratory disturbance index (RDI) were computed. Using six parameters (i.e neck circumference, systolic blood pressure before sleep, degree of alcohol drinking, frequency of breath-holding during sleep, degree of dry mouth during sleep, sleep apnea score), the patients with RDI above 20 could be discriminated in 92.8% sensitivity. In case of more than two among six parameters (neck circumference of above 40cm, systolic blood pressure of above 125mmHg, frequent alcohol drinking, frequent breath-holding during sleep, frequent dry mouth during sleep, sleep apnea score of above 35), same patients could be discriminated in 87.6% sensitivity. In case of more than one among four parameters (neck circumference of above 40cm, systolic blood pressure of above 125mmHg, frequent alcohol drinking, body weight of above 80kg), discrimination sensitivity was 83.5%. In conclusion, the patients suspicious of RDI above 20 using above parameters should be refered for PSG, because whose sleep apnea is not easy to be cured only by snoring operation.

TFT-LCD 모듈의 충격해석에 관한 연구

이정권,최성식 대한기계학회 2004 大韓機械學會論文集A Vol.28 No.5

The impact behavior of TFT-LCD module is very complicated because the module is assisted with three parts such as back light unit, LCD Panel and top chassis. Especially, the back light unit is constructed with several small and thin parts made by plastics or steels. The design of the back light unit is very important because the recent demand is more lighter, thinner and narrower module. The aim of the present study is the investigation of mechanical characteristics during impact loading. The back light unit must assist TFT-LCD Panel made by glass and guide qualification of handling environment. This paper focus on the dynamic behavior of module and carries out a series of computer simulation using LS-DYNA program. Comparing with test results previously performed, dynamic characteristics of TFT-LCD module are estimated.

이차원 메소해석에 의한 손상재료의 유효강성평가

이정권 대한기계학회 2004 大韓機械學會論文集A Vol.28 No.5

Two-dimensional mesoscopic analysis (meso-analysis) is applied to solids including microdefects such as microcracks or holes. For the problem of effective moduli of microdefected solids, various approximate schemes are introduced by using microcrack density and hole density for macro level parameter. Also, microcracks distributed in the parallel direction and random direction are considered. Several numerical studies using meso-analysis are carried out and the results are compared with several approximate schemes in order to show the validity of proposed meso-analysis.

Pathophusiology of Snoring

이정권 대한비과학회 1995 Journal of rhinology Vol.2 No.1

직장인의 예방의학 : 위암의 예방

이정권 평화문제연구소 1994 통일한국 Vol.131 No.-

직장인의 예방의학 : 해외출장 중의 건강관리

이정권 평화문제연구소 1994 통일한국 Vol.130 No.-

직장인의 예방의학 : 과민성 장 증후군

이정권 평화문제연구소 1994 통일한국 Vol.127 No.-