PURPOSE: Automated external defibrillators (AEDs) could not recommend shock for ventricular fibrillation in the presence of electromagnetic interference. The purpose of this study was to examine the effect of an induced electromagnetic field on performance of AED. METHODS: The intensity of magnetic waves from commercial electric mats was measured. Three AEDs were attached to the resuscitation manikin and the question of whether shock would be recommended for simulated electrocardiogram of VF or normal sinus rhythm was tested. The simulation was repeated 10 times under the influence of 0, 5, and 18 µT magnetic field or electric mat. Relevant literature studies on electromagnetic interference on AED were reviewed. RESULTS: The magnetic flux density from the electric mat was measured to 5.67-6.1 µT in warming phase, and 2.25-2.84 µT in maintenance phase. There was no false positive or false negative recommendation of shock under the influence of 0, 5, and 18 µT magnetic field or electric mat. However, one AED detected motion even in the stationary state. Among 11 studies from the literature search, five studies reported misinterpretation of AED. Minor errors including delayed analysis, motion artefact, and noise in speakers were reported from 6 studies. CONCLUSION: Although we could not reproduce false negative interpretation, AED made a mistake in confusing electromagnetic interference with motion artefact. Therefore, emergency providers should be cautious not to use AED close to household appliances or medical equipment inducing electromagnetic interference.
Artifacts ; Defibrillators* ; Electrocardiography ; Electromagnetic Fields ; Emergencies ; Family Characteristics ; Magnetic Fields ; Magnets* ; Manikins ; Noise ; Resuscitation ; Shock ; Ventricular Fibrillation

BACKGROUND AND OBJECTIVES: Viral rhinitis has been considered as an important part in the clinical activity of the ENT specialists in private practice. However, the estimate of how big a proportion the viral rhinitis has and how it is being treated in otolaryngic private practitioners has not been published yet. Thus we aimed to investigate these issues in this study. MATERIALS AND METHODS: Four hundred ENT specialists privately practicing in Seoul, Gyeongki, and Choongcheong area were selected. Questionnaire pertaining to the proportion of viral rhinitis patient on their practice and their way of treatment was mailed to the selected doctors. RESULTS: The patients presenting with viral rhinitis symptom constitutes 38.9% of their patient population on the average. Most patients with viral rhinitis visited ENT specialists within 7 day after onset of rhinitis symptom. The mean duration of prescription for the patients not having complication was 4.3 days. The most frequently prescribed medication for viral rhinitis was first generation antihistamine, systemic decongestants, nebulization, and NSAID in order of frequency. The most annoying symptom for the viral rhinitis patients was nasal obstruction. CONCLUSION: The results of this study indicate that viral rhinitis takes an important position in the otolaryngic private practice.
Humans ; Nasal Decongestants ; Nasal Obstruction ; Postal Service ; Prescriptions ; Private Practice ; Rhinitis* ; Seoul ; Specialization ; Surveys and Questionnaires

Sinochoanal polyp is an inflammatory polyp that originates in the paranasal sinus, passes through a sinus ostium, and extends into the choana. While antrochoanal polyp is the most common type of sinochoanal polyp, sphenochoanal polyp is rare and ethmochoanal polyp is extremely more rare to find. To minimize postsurgical recurrence, it is essential to completely remove the polyp together with the base of its origin. We have recently experienced and successfully managed three cases of ethmochoanal polyp by endoscopic sinus surgery. It was difficult to histologically differentiate ethmochoanal polyp from sinonasal polyps associated with chronic rhinosinusitis. For this reason, ethmochoanal polyp should be suspected and completely removed together with the base of its origin when a large polyp originates from the ethmoid sinus and extends into the choana. Now we report three cases of ethmochoanal polyp with a brief review of the related literatures.
Ethmoid Sinus* ; Polyps* ; Recurrence

BACKGROUND AND OBJECTIVES: To have better understanding on the pathophysiology of rhinovirus infection, an availability of an ideal experimental model is of utmost importance. We aimed to develop a new study model using the organ culture of turbinate mucosa to overcome the limitations of the conventional study methods. MATERIALS AND METHOD: The inferior turbinate mucosae harvested during the septoturbinoplasty were cultured in air-liquid interface methods, placed on the support of gelfoam soaked in the culture media. Human rhinovirus -16 was applied on the top of the mucosal surface. The success of rhinovirus infection was determined by semi-nested RT-PCR of the mucosal surface fluid taken 48 hours after incubation. Intracellular rhinovirus was visualized by in situ hybridization. Elaboration of cytokine IL-6 and IL-8 into the culture media was quantitated using the ELISA method. RESULTS: PCR product of 292 bp on semi-nested RT-PCR, representing successful rhinovirus infection, was detected in 5 tissues out of 10 mucosal tissues. In the in situ hybridization method, positively stained cells were found in epithelial layer in scattered fashion. In the analysis of cytokine production by continuous exposure to rhinovirus according to the time course, IL-6 and IL-8 secretions in the infected mucosae were significantly greater than in the control mucosa. The increase in the cytokine production was evident from 24 hours after the infection. CONCLUSION: The results of this study indicate that the organ culture of turbinate mucosa could serve as an acceptable in vitro model for studying pathophysiology of rhinovirus infection.
Culture Media ; Enzyme-Linked Immunosorbent Assay ; Gelatin Sponge, Absorbable ; Humans ; In Situ Hybridization ; Interleukin-6 ; Interleukin-8 ; Models, Theoretical ; Mucous Membrane* ; Organ Culture Techniques* ; Polymerase Chain Reaction ; Rhinovirus* ; Turbinates*

It is noted that Streptococcus mutans (S. mutans) triggers dental caries establishment by two major factors: the synthesis of organic acids, which demineralize dental enamel, and the synthesis of glucans, which mediate the attachment of bacteria to the tooth surface. Therefore, it is noted that the development of a more effective, substantial and safe preventive agent that works against dental caries and periodontal disease is required at this time. For this reason, the present study was designed to investigate the effect of croton seed ethanol extracts on the growth, acid production, adhesion, and insoluble glucan synthesis of S. mutans. In this case, the ethanol extract of croton seed showed concentration dependent inhibitory activity against the growth, acid production and adhesion of S. mutans. Especially, it is important to note that it has produced significant inhibition at the concentration of 0.1 and 0.2 mg/ml as compared to the control group. Moreover, these results suggest that the application of croton seed extract may be considered to be a useful method for the prevention of dental caries.
Bacteria ; Croton ; Dental Caries ; Dental Enamel ; Ethanol ; Glucans ; Methods ; Periodontal Diseases ; Streptococcus mutans ; Streptococcus ; Tooth

Legalized gambling is a growing industry, and is probably a factor in the presently increasing prevalence of pathological gambling. We present a case of a 36-year-old pathological gambler who was treated with fluvoxamine, a selective serotonin reuptake inhibitor, and who was assessed by functional MRI before and after drug administration. During activation periods, the pathological gambler was shown cards as stimuli, and fMRI results in several brain regions showed differential effects before and after medication and a maintenance period. This case demonstrates that the treatment response to fluvoxamine in a pathological gambler was observed not only by subjective self-report, but also by objective fMRI results. Therefore, fMRI may be a useful tool in the diagnosis and prediction of treatment response in patients afflicted with pathological gambling.
Adult ; Behavior, Addictive/*drug therapy ; Fluvoxamine/*therapeutic use ; *Gambling ; Humans ; Magnetic Resonance Imaging ; Male ; Serotonin Uptake Inhibitors/*therapeutic use ; Treatment Outcome

No abstract available.
Extremities* ; Ischemia* ; Muscles* ; Reperfusion*

PURPOSE: It is recommended that the cuff is inflated with about 10 ml air because cuff pressure is maintained from 25 cmH2O(=18.39 mmHg) to 40 cmH2O(=29.424 mmHg). This study is performed to evaluate the air volume of highvolume and low-pressure cuff during maintaining appropriate pressure. METHODS: The tracheal models are hexahedral structures were made of monomer Cast Polyamide with a whole diameter from 10 mm to 30 mm at 1mm interval each. They were 1/100 with accuracy. Intubation tube were Hi-LoT M (Mallinckrodt, Athlone, Ireland), high-volume low-pressure cuff tube. The diameter of tubes was from 5.0 mm to 8.0 mm at 0.5 mm interval each. Cuff pressure was measured with cuff pressure control (Tracoe(R), Mains, Germany). Inflated cuff volume is measured by plastic syringe (Becton-Dickson Korea, Seoul, Korea) in maintaining recommended cuff pressure. Volume measurements were twice by each different tester. RESULTS: There were considerable volume differences between each tube size and each model. The bigger trachea model diameter was, the more intracuff air volume was. There was the least volume difference in 5.5 mm intubation tube size (3.5~11.5 ml). There was the most difference in 7.5 mm intubation tube size (3.5~19.5 ml). Totally, the maximum air volume was 22.3 ml, the mininum air volume was 1.5 ml. The difference was 20.8 ml. CONCLUSION: The inflated volumes of cuff in proper cuff pressure were considerably different by the diameter sizes of tracheal models and tube sizes. Therefore, it will be more convenient and safe to use device for maintaining cuff pressure properly.
Data Collection ; Intubation ; Korea ; Nylons ; Plastics ; Seoul ; Syringes ; Trachea

OBJECTIVE: The aim of this study was to evaluate the mechanical and biological properties of orthodontic bonding agents containing silver- or zinc-doped bioactive glass (BAG) and determine the antibacterial and remineralization effects of these agents. METHODS: BAG was synthesized using the alkali-mediated solgel method. Orthodontic bonding agents containing BAG were prepared by mixing BAG with flowable resin. Transbond™ XT (TXT) and Charmfil™ Flow (CF) were used as controls. Ion release, cytotoxicity, antibacterial properties, the shear bond strength, and the adhesive remnant index were evaluated. To assess the remineralization properties of BAG, micro-computed tomography was performed after pH cycling. RESULTS: The BAG-containing bonding agents showed no noticeable cytotoxicity and suppressed bacterial growth. When these bonding agents were used, demineralization after pH cycling began approximately 200 to 300 µm away from the bracket. On the other hand, when CF and TXT were used, all surfaces that were not covered by the adhesive were demineralized after pH cycling. CONCLUSIONS: Our findings suggest that orthodontic bonding agents containing silver- or zinc-doped BAG have stronger antibacterial and remineralization effects compared with conventional orthodontic adhesives; thus, they are suitable for use in orthodontic practice.
Adhesives ; Dental Cements ; Glass* ; Hand ; Hydrogen-Ion Concentration ; Methods

BACKGROUND AND OBJECTIVES: Genetic factors play a role in the etiology of allergic rhinitis. The glutathione S-transferase (GSTP1) is one of the detoxifying enzymes for oxidative stress. The purpose of this study is to examine Polymorphisms of whether there is an association between some alleles of GSTP1 genes and allergic rhinitis. SUBJECTS AND METHOD: Patients with allergic rhinitis were selected on the basis of the following criteria: 1) watery rhinorrhea, sneezing, nasal obstruction and/or itching for longer 3months and 2) positive reaction at the allergic skin prick test for DP, DF allergen and 3) positive reaction at specific IgE RAST for DP, DF allergen. GSTP1 gene polymorphisms in exon5 (Ile105Val) were analyzed by polymerase chain reaction (PCR) with restriction fragment length polymorphisms (RFLP) in 149 patients with allergic rhinitis and 156 healthy control subjects. RESULTS: In allergic rhinitis, Ile105/Ile105 were 106 cases (71.1%), Ile105/Val105 were 42 cases (28.2%), Val105/Val105 were 1 case (0.7%) and in normal controls, Ile105/Ile105 were 100 cases (64.1%), Ile105/Val105 were 45 cases (28.8%), Val105/Val105 were 11 cases (7.1%)(p=0.004). CONCLUSION: Genetic polymorphism of Val105/Val105 in GSTP1 may be protective genotypes in allergic rhinitis.
Alleles ; Genotype ; Glutathione Transferase* ; Glutathione* ; Humans ; Immunoglobulin E ; Nasal Obstruction ; Oxidative Stress ; Polymerase Chain Reaction ; Polymorphism, Genetic ; Polymorphism, Restriction Fragment Length ; Pruritus ; Rhinitis* ; Skin ; Sneezing