Alterations of the Ventilation-Perfusion Ratio Measured by Using a Multiple Inert Gas Elimination Technique (MIGET) in One Lung Ventilated Rabbit / 대한마취과학회지

BACKGROUND: In this study, we performed one-lung ventilation (OLV) in rabbits to assess the effects of OLV on the VA/Q ratio and the respiratory physiological changes using MIGET. METHODS: Ten male New Zealand white rabbits, weighing 3-4 kg were selected. To perform MIGET, six inactive gases (SF6, krypton, desflurane, enflurane, diethyl ether, acetone) in 500 ml normal saline were injected intravenously. During two-lung ventilation (TLV), and after OLV for 30 minutes, blood was sampled for blood gas analysis and MIGET, hemodynamic variables were measured. For MIGET, the concentrations of the injected inert gases were measured and converted to retention/excretion data; the VA/Q distribution curve was obtained using a computer. RESULTS: Systolic, mean, and diastolic pulmonary pressures were elevated significantly and pulmonary resistance was doubled (P<0.05) in OLV compared to TLV. Blood pH decreased in OLV. The calculated intrapulmonary shunt was 19% and 52%, TLV and OLV, respectively. The analysis of VA/Q using MIGET showed that the VA/Q distribution curve was wider and that the VA/Q area was larger in normal rabbits. And, that intrapulmonary shunt approximated to 11%. In the case of OLV, a significant increase in shunt was observed but no change in the amount of dead space at distribution area, (log SDQ, log SDV) remained the same, whereas the VA/Q distribution curve shifted toward the right. CONCLUSIONS: OLV in rabbits showed severe hypercapnia and hypoxemia leading to a considerable increase in shunt. Because of the wide range of VA/Q distribution in TLV, no significant changes in respiratory variables were observed during OLV.

Fusarium Fruit Rot of Citrus in Jeju Island

Twenty-three isolates of Fusarium spp. were obtained from decayed citrus fruits in the fields and storages in 1998-1999. Of them, six and five isolates belonged to F. proliferatum and F. moniliforme, respectively, which were the most common. F. solani and F. sambucinum had each two isolates, F. equiseti had one isolate and seven isolates were unidentified. They produced symptoms of two types in pathogenicity test: those with leathery, beige to light or dark brown, and sunken lesions without surface mycelium (type-1) and those with lesions covered with white, beige or pink surface mycelium (type-2). Four of six isolates identified to F. proliferatum and two unidentified isolates produced type-1 lesions, and all isolates identified to F. moniliforme, F. solani, F. sambucinum, F. equiseti and five unidentified isolates produced type-2 lesions.

Analysis of Tensile Strength of Double Helix Wires / 대한정형외과학회잡지

PURPOSE: To compare the tensile properties of double helical twisting. MATERIALS AND METHODS: 21G and 18G stainless steel wires were used. Monostrand, untwisted double strand and manually twisted double helix wires were tested under gradually increasing tension force until the wires break. Data were analyzed by using a computer system to get force-strain curves. RESULTS: Forces at the break point showed no significant differences between untwisted double strand wires and helically twisted double strand wires. Forces at the yield point deformation were proportionally increased to the degree of helical twisting until the wires were twisted 20 times (piptch number: 24/10 cm) with no more increase after then. Final strain at break point decreased by helical twisting, which means the range of plastic deformation decreased. CONCLUSION: By helical twisting, the wires increase in elastic range and decrease in plastic deformation. Therefore, double helix wiring seemed to be a more effective method of fixation compared to the untwisted double strand wires.

Morphological Difference of Polyethylene Section in Knee Arthroplasty

The purpose of this study is to see the value of transsectional morphology of polyethylene for evaluation of wear and characteristics of ultra-high molecular weight polyethylene. Retrieved nineteen polyeth- ylene tibial components were examined for this study. Ten components were the directly molded 1900 Himont polyethylene, and 9 components were the machined GUR 415 polyethylene. Transsection of polyethylene(thickness: 60 - 150 micron) was obtained by microtome and was examined microscopical- ly for the fusion defects, subsurface white bands, and delamination as a mode of wear. Significant differ- ences between two groups of polyethylene were found. Fusion defects greater than 100 micron were observed in 5 among 9 GUR 415 polyethylene. Subsurface white band were observed in 7 among 9 GUR 415 polyethylene. Delamination was found in 6 arnong 9 GUR 415 polyethylene. Neither fusion defects greater than 100 micron, nor delamination were observed in 1900 Himont polyethylene. Morphological examination of polyethylene section is an efficient way to differentiate the polyethylene and to evaluate the wear behavior of retrieved polyethylene. This study suggests that delamination of polyethylene tibial components is influenced by resin type and / or manufacturing method.

Lumbar Disc Herniation with Cauda Equina Syndrome after Self Traction Therapy: A Case Report / 대한척추외과학회지

STUDY DESIGN: A retrospective case report of lumbar disc herniation with cauda equina syndrome after self traction therapy. OBJECTIVES: Documentation of clinical significance and manifestations of disc herniation with cauda equina syndrome as one of the complications after self traction therapy. SUMMARY OF BACKGROUND DATA: Various conservative managements of acute low back pain in adults such as traction, spine manipulation therapy(SMT), and exercise therapy may produce harmful complications, especially when performed by non-professional therapists. Recently, reports of complication from SMT are increasing, however, understanding of biomechanism and natural history of traction, SMT, and exercise therapy are still poor. Therefore background information on the possible complications from their management is essential for physicians. METHOD: A case of acute cauda equina syndrome after self traction therapy in a 41 year-old man. Magnetic resonance imaging revealed severe compression of cauda equina by a huge mass. Emergency lumbar laminectomy was performed and all the compressing mass was removed. The mass was proven to be prolapsed disc of nearly whole nucleus amount and scanty nucleus was found within the disc space. RESULT: Acute low back pain and radiating pain disappeared immediately after operation. And neurologic deficits began to improve after postoperative 1 week. At the 15 month follow-up, the patient had recovered fully except minimal paresthesia on the right foot. CONCLUSION: More attentions to the possibility and clinical features of this complication seemed to be needed to the clinicians and therapists who do conservative management for the low back problems, especially SMT, traction, exercise therapy etc.