In order to investigate working conditions of underground coal mines, this work was undertaken to evaluate the respirable dust and the concentration of quartz in Taeback and Kangneung areas. The concentration of quartz was determined by Fourier Transform Infrared Spectrophotometry. The results were as follows; 1) The concentration of respirable dust of drilling and coal face in Taeback and Kangneung areas were as followed. 2) Distribution of respirable dust was well fitted to the long-normal distribution and geometric mean value was log(-1) 0.37+/-log(-1) 0.47 (2.34+/-2.95) mg/m3. 3) The difference of respirable dust concentrations in Taeback and Kangneung areas was not significant statistically (p>0.05). 4) The concentration of quartz of drilling and coal face in Taeback and Kangneung areas were as followed. 5) Distribution of quartz concentrations was well fitted to the log-normal distribution and geometric mean value was log(-1) 0.33+/-log(-1) 0.45 (2.14+/-2.82)%. 6) The difference of quartz concentrations in Taeback and Kangneung areas was not significant (p>0.05), but significant at drilling sites and coal faces (p<0.05).
Coal* ; Dust* ; Fourier Analysis ; Gangwon-do* ; Quartz* ; Spectrophotometry, Infrared

It has been known that CT scan shows only a few abnormalities within the first hours of acute ischemic stroke. We investigated the frequency and the predictive value of early CT scan signs of ischemia for late infarct locations In acute middle cerebral artery (MCA) territory stroke. Precontrast CT (PCT) scans were performed in the 35 consecutive patients with cerebral anterior circulation infarction within 6 hours after the onset of stroke. We confirmed MCA territory infarction on follow-up PCT or MRI within 3 to 7 days. The locations of infarction were classified deep, superficial, and total (deep and superficial) infarction on follow-up PCT or MRI. The initial PCT was abnormal in 74.3% (26/3s). The locations of infarction were deep in 10, superficial in 8, and total in 14. Abnormal findings of the initial PCT were attenuation of lentiform nucleus (ALN) in 18 patients, loss of insular ribbon (LIR) in 11, hemispheric sulcus effacement (HSE) in 10, hyperdense MCA sign (HMCAS) in 2, and small subcortical low attenuation in 2. Of 24 patients with late infarction in basal ganglia 18 (75%) had ALN on initial PCT. Of 17 patients with late infarction in insular cortex 11 (65%) had LIR. Of IS patients with late infarction in cerebral cortex 10 (67%) had HSE. Early PCT signs were correlated with late locations of MCA territory infarction : ALN - deep infarct, HSE - superficial infarct, LIR - superficial infarct, HMCAS - total infarction. Our findings suggest that PCT frequently discloses abnormalities during the first hours of ischemic stroke. Early signs of ischemia on the initial PCT scan may predict the late infarct locations on follow-up study.
Basal Ganglia ; Cerebral Cortex ; Corpus Striatum ; Follow-Up Studies ; Humans ; Infarction ; Ischemia ; Magnetic Resonance Imaging ; Middle Cerebral Artery* ; Stroke* ; Tomography, X-Ray Computed*

The North American Symptomatic Carotid Endarterectomy Trial (NASCET) demonstrated the superiority of endarterectomy over medical management for symptomatic carotid stenosis of 70-99%. More recently, the Asymptomatic Carotid Atherosclerosis Study (ACAS) showed a statistically significant reduction in stroke incidence after carotid endarterectomy (CEA) in asymptomatic carotid stenosis of 60-99%. But CEA has not been frequently performed in Korea. We reviewed the 38 CEA cases which were performed from November 1994 to September 1996 in respect to clinical presentations, findings of brain and neurovascular imaging, and complications. The risk factors were hypertension in 25 patients, hyperlipidemia in 23, smoking in 20, transient ischemic attack (TIA) in 20, minor stroke in 12, heart disease in 17 (coronary artery disease in 16 and sick sinus syndrome in 1), and DM in 13. The clinical presentations of 28 symptomatic carotid stenosis included hemispheric TIA in 17 patients, retinal TIA in 2, and minor stroke in 9. Of 10 asymptomatic carotid stenosis included coronary heart disease in 7 patients, asymptomatic carotid bruit in 3, posterior cerebral artery territory infarction in 4, and vascular claudication in 1. The degrees of carotid artery stenosis were measured by use of the linear-based methods of NASCET on the selected carotid angiography. The locations of carotid artery stenosis were near the bifurcation area in 28 cases, proximal ICA in 9, and common carotid artery in 1. Four out of 9 cases with proximal ICA stenosis at above 2 cm distal to bifurcation had long segmental stenosis more than 3 cm in length. Among them 3 cases had separated multi-segmental stenosis of proximal ICA. CEA was performed unilaterally in 28 patients and bilaterally in 5. Thirty0eight CEAs had carotid artery stenosis of 70-99% in 25 cases (4 had ulceration), 50-69% in 7 (2 had ulceration), 30-49% in 3 (all had ulceration), and 0-29% in 3 (all had ulceration). Of 38 CEAs 7 cases had stenosis (>50%) and/or occlusion of intracranial arteries and 15 had stenosis and/or occlusion of contralateral carotid artery. Peri-operative complications included minor ischemic stroke in 1 case, death in 1, and frontal lobe syndrome in 1.
Angiography ; Arteries ; Brain ; Carotid Arteries ; Carotid Artery Diseases ; Carotid Artery, Common ; Carotid Stenosis ; Constriction, Pathologic ; Coronary Disease ; Endarterectomy ; Endarterectomy, Carotid* ; Frontal Lobe ; Heart Diseases ; Humans ; Hyperlipidemias ; Hypertension ; Incidence ; Infarction ; Ischemic Attack, Transient ; Korea ; Posterior Cerebral Artery ; Retinaldehyde ; Risk Factors ; Sick Sinus Syndrome ; Smoke ; Smoking ; Stroke

A Fourier transform infrared spectrophotometric method was described for the determination of quartz, mica(sericite) and feldspar(potassium feldspar) in respirable dust in Taebaek area. The results were as follows; 1) The concentration of minerals were determined from the intensity of absorption peak of quartz at 799 cm-1, sericite at 539 cm-1, and potassium feldspar at 648 cm-1 respectively. 2) The precision(C. V. %) for the quartz determination was 7.70+/-2.68 % from 10 to 200 microgram of quartz. 3) The precision for the sericite determination was 16.34+/-6.82 % from 30 to 500 microgram of serictite. 4) The precision for the potassium feldspar determination was 5.28+/-1.74 % from 30 to 500 microgram of potassium feldspar. 5) The concentration of respirable dust in Taebaek area was 4.90+/-3.29 mg/m3(0.4-93.7%), percent quartz was 1.80+/-4.14% (0.01-20.56%), percent sericite was 11.37+/-6.43% (0.00-29.69%), percent potassium feldspar was 8.15 % (n=7, 3.41-19.70%). 6) The difference of respirable coal dust, quartz, and sericite concentration in drilling, coal cutting, hauling and separating was significant respectively (p<0.05).
Absorption ; Coal ; Dust* ; Fourier Analysis* ; Minerals ; Potassium ; Quartz* ; Spectrophotometry, Infrared*

Reviewing the results of the blood cultures performed at Yeungnam University Hospital during 4-year-period through January, 1, 1984 to December 31, 1987, the following results were obtained. 1) Out of 8083 blood specimens cultured microorganisms grew in 582 specimens with positivity rate of 7.20%. Polymicrobial bacteremia was found in 16 patients. 2) Among 582 positive specimens, Gram-positive cocci grew in 189 specimens, and Gram-negative bacilli, in 393 specimens. Clinically significant microorganisms consisted of 82 Staphylococcus aureus, and 20 Streptococcus species in Gram-positive cocci group, 80 Salmonella typhi, 72 Escherichia coli, 72 Salmonella paratyphi A in Enterobacteriaceae, and 46 Pseudomonas cepacia, and 16 Pseudomonas aeruginosa in glucose non-fermenting microorganisms. 3) Increasing incidence of Serratia, Acinetobacter and Pseudomonas species as major nosocomial infection source is noteworthy. They showed increased tendency from 6.3% of 1984 to 17.7% of 1987 of total positive blood cultures. 4) High isolation rate of Pseudomonas species and Aeromonas hydrophila was noted in summer, while Salmonella typhi showed high prevalence from May to September and in January. 5) In susceptibility tests of isolated organisms, staphylococcus aureus was sensitive to basic antimicrobial agents except for ampicillin. The glucose non-fermenting microorganisms showed high resistance to basic antimicrobial agents in 32.2%. In conclusion, considering the relatively higher incidence of growth of Staphylococcus epidermidis than ideal level indicates that sampling technique should be improved. Secondly, all the hospital staffs in cooperation with Hospital Infection Committee are desirable to pay efforts to decrease the nosocomial infection.
Acinetobacter ; Aeromonas hydrophila ; Ampicillin ; Anti-Infective Agents ; Bacteremia ; Burkholderia cepacia ; Cross Infection ; Enterobacteriaceae ; Escherichia coli ; Glucose ; Gram-Positive Cocci ; Humans ; Incidence ; Prevalence ; Pseudomonas ; Pseudomonas aeruginosa ; Salmonella paratyphi A ; Salmonella typhi ; Serratia ; Staphylococcus aureus ; Staphylococcus epidermidis ; Streptococcus

BACKGROUND: Propofol and alfentanil are frequently combined to provide total intravenous anesthesia (TIVA). The goals of this study were to determine the target plasma concentration (predicted plasma concentration) of propofol required to provide satisfactory anesthesia in the presence of nitrous oxide over a range of alfentanil infusions for analgesia and to determine the dosing rates required to achieve adequate anesthesia. METHODS: Sixty patients undergoing plastic surgery were anesthetized with 50% nitrous oxide, alfentanil (0 [A0 group] or 5ng/kg loading followed by 0.12ng/kg/min [A5 group] or 10ng/kg loading followed by 0.25ng/kg/min [A10 group] or 20ng/kg loading followed by 0.5ng/kg/min [A20 group]) and propofol using a target-controlled infusion (TCI). The mean target concentration and infusion rate of propofol, and induction and recovery time according to changes of the alfentanil regimen were checked. RESULTS: Induction and recovery time were prolonged in the A0 group more than other groups, and recovery time was shortened in the A10 group more than the other three groups (P < 0.05). The infusion rate and mean target concentration of propofol had significant impact among the groups (P < 0.05). Side effects did not differ among the groups. CONCLUSIONS: The optimal target plasma propofol concentrations and infusion rates of alfentanil, both with satisfactory intraoperative anesthetic conditions and speed of recovery, are 3.51, 3.02, 2.35ng/ml and 0.12, 0.25, 0.5ng/kg/min with 5, 10, 20ng/kg loading in plastic surgery patients. We recommand 0.25ng/kg infusion with 10ng/kg loading of alfentanil combined with 3.02ng/ml of target plasma concentration of propofol as the best combination dosage to shorten recovery time.
Alfentanil* ; Analgesia ; Anesthesia ; Anesthesia, Intravenous ; Humans ; Nitrous Oxide ; Plasma ; Propofol* ; Surgery, Plastic*

During the rehabilitation period, traumatic fracture of the lower extremity in chronic spinal cord injured patients may be occur frequently. In the past, conservative treatment with pillow or plaster splinting was advocated by many clinician, but its treatment is still controversial. This paper presents our experience with fracture of 20 patients(5.7%) of total 350 patients who had spinal cord injuries from Jan. 1980 to Mar. 1987 at Korea Veterans Hospital. The results were as follow. 1. The incidence of fracture was not related to age, sex, type and duration of spinal cord injury. 2. The most common cause of fracture was insignificant trauma(94%). 3. The distribution of fracture was in the following order of frequency;supracondyle of femur (20%), shaft of femur (20%), shaft of tibis (16%). 4. The methods of treatment-Twenty cases were treated by conservative treatment and eleven cases were treated by operative treatment in following order; paster splint with well padded; 9 cases (20%), pillow splint; 4 eases (13%), plate and screw; 3 cases (10%). 5. Total 11 cases of complications were 8 cases in conservative treatment and 3 cases in operative treatment. 6. The duration of bone union was average 10 weeks in nonoperative treatment and average 10.2 weeks in operative treatment. Treatment should strive to achieve fracture healing with minimal danger to the patient and should cause little or no interfrence with patient's daily routine.
Femur ; Fracture Healing ; Fractures, Bone ; Hospitals, Veterans ; Humans ; Incidence ; Korea ; Lower Extremity ; Rehabilitation ; Spinal Cord Injuries ; Spinal Cord ; Splints

Pure red cell aplasia in uncommon disorder characterized by finding of anemia, absence of nucleated red blood cell in the marrow, absence of reticulocytes in the peripheral blood and normal peripheral platelet and leukocytes counts. We experienced one case of pure red cell aplasia associated with hemolytic anemia characterized by hemoglobinuria, reticulocytopenia, and erythroid hypoplasia of the bone marrow. The cause of the illness was not definitely identified, but we concluded that this patient had simultaneous occurrence of PRCA and hemolytic anemia following administration of diphenylhydantoin after craniotomy rather than virus or bacteria induced. The simultaneous occurrence of PRCA and hemolytic anemia in uncommon and the mechanism for diphenylhydantoin induced PRCA and hemolytic anemia is unclear.
Anemia ; Anemia, Hemolytic ; Bacteria ; Blood Platelets ; Bone Marrow ; Craniotomy ; Erythrocytes ; Hemoglobinuria ; Humans ; Leukocytes ; Phenytoin ; Red-Cell Aplasia, Pure* ; Reticulocytes

There are numerous agents with potential toxic effects on the lung. In particular, cytotoxic drugs constitute the largest and most imprtant group of agents associated with lung toxicity. Bleomycin is commonly used, either alone or in combination with other chemotherapeutic agents, in the treatment of squamous cell carcinoma(head and neck, esophagus, and genitourinary tract), lymphoma, and germ cell tumor. One of the therapeutic advantages of bleomycin is its minimal bone marrow toxicity. However, pulmonary toxicity is one of the most serous adverse side effect. Classically, pulmonary toxicity manifests as a diffuse interstitial process or less commonly as a hypersensitivity reaction. This pulmonary toxicity is generally considered to be dose related and can progress to a fatal fibrosis. It is also possible that bronchiolitis obliterans organizing pneumonia(BOOP) is another manifestation of bleomycin induced toxicity. Bleomycin induced BOOP is less common and has a favorable response to steriod therapy. Here we present a case that demonstrates a BOOP, secondary to a relatively small cumulative dose of bleomycin(225mg/??, may be reversible.
Bleomycin* ; Bone Marrow ; Bronchiolitis Obliterans* ; Bronchiolitis* ; Cryptogenic Organizing Pneumonia ; Esophagus ; Fibrosis ; Hypersensitivity ; Lung ; Lymphoma ; Neck ; Neoplasms, Germ Cell and Embryonal ; Pneumonia*

Purpose: To report a case of ocular and facial herpes zoster and meningitis after herpes zoster vaccination.Case summary: A 60-year-old man was administered Zostavax® on his left arm; he developed a vesicular rash over his left eye and forehead 4 days afterwards. He started antiviral drugs for the rash, and visited the hospital for severe headache and spread of the rash to involve the tip of his nose, face, and palate by day 7. He was taking Synthyroid® (Bukwang Pharmaceuticals, Seoul, Korea) since his thyroidectomy for thyroid cancer 6 years ago. He had never been diagnosed with chickenpox, but had an episode of red facial rash in childhood. Slit-lamp examination revealed conjunctival chemosis, hyperemia, and a pseudodendrite in the peripheral cornea. The anterior chamber was quiet, and there were no significant findings on his brain magnetic resonance imaging. Varicella zoster virus was detected in the cerebrospinal fluid by polymerase chain reaction. The patient was treated with oral acyclovir drugs and topical ganciclovir, levofloxacin, and bromfenac. One week later, the pseudodendrite disappeared and conjunctival chemosis improved. There was no recurrence during 6 months follow-up. Conclusions Reactivation of ocular or facial herpes zoster or meningitis after zoster vaccination may occur, rarely. Immediate antiviral treatment is required in these cases.