Journal of Yeungnam Medical Science

Young Hoon Park

11 Articles

Causative organisms of neonatal sepsis.: Kyung Ah Kim, Son Moon Shin, Han Gu Moon, Young Hoon Park; Yeungnam Univ J Med. 1999;16(1):60-68. Published online June 30, 1999; DOI: https://doi.org/10.12701/yujm.1999.16.1.60

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A nationwide survey was conducted to investigate the annual occurrence rate of neonatal sepsis, maternal risk factor in neonatal sepsis, localized infection in neonate, causative organism in nosocomial infection and the most common causative organism in neonatal sepsis in Korea. Clinical and bacteriological data were collected from thirty seven neonatal units through retrospective review of the medical records of the newborn infants who were confirmed as neonatal sepsis by isolating organisms from blood culture during one year study period from January to December in 1997. 78,463 neonates were born at 37 hospital in 1997 and 20,869 neonates were admitted to the neonatal units. During this period, 772 episodes of neonatal sepsis were recorded in 517 neonates. The occurrence rate of neonatal sepsis was 0.73%(0~2.95%). Male to female ratio was 1.15:1 and 303 cases(42.1%) were born prematurely. The main pathogens of early onset sepsis were S. aureus(20%), S. epidermidis(14.4%) and coagulase negative Staphylococcus( 14.4%). Gram negative bacilli including Enterobacter spp (7.2%), E.coli(5.1%), Klepsiella(4.5%), Pseudomonas(3.7%) Enterobacter faecium(3.6%) constitute 24.1%. Only two cases of group B beta-hemolytic Streptococcus were isolated. Common obstetric factors were PROM(21.1%), difficulty delivery(18.7%), fetal tachycardia(5.3%), chorioamnionitis(4.9%), maternal fever(4.7%). The main pathogens of late-onset sepsis were S. aureus(22.3%), S. epidermidis(20.4%) and CONS(9.9%). There were 6 cases (1.0%) of Candida sepsis. Frequent focal infections accompanying sepsis were pneumonia(26.1%), urinary tract infection(10.5%), meningitis(8.2%), and arthritis(3.6%). S. epidermidis(22.0%) and S. aureus(21.7%) were also the most common pathogens in 373 nosocomial infection.

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Characteristics of Microorganisms Isolated from Blood Cultures at a University Hospital Located in an Island Region During 2003~2007
Sung Ha Kang, Young Ree Kim
Korean Journal of Clinical Microbiology.2008; 11(1): 11. CrossRef
Microorganisms Isolated from Blood Cultures and Their Antimicrobial Susceptibility Patterns At a University Hospital During 1994-2003
Eun-Mi Koh, Sang-Guk Lee, Chang Ki Kim, Myungsook Kim, Dongeun Yong, Kyungwon Lee, June Myung Kim, Dong Soo Kim, Yunsop Chong
Annals of Laboratory Medicine.2007; 27(4): 265. CrossRef

Acute Phase Retinal Phototoxicity Induced by Blue Fluorescent Light.: Young Hoon Park, Soon Cheol Cha, Duk Kee Hahn; Yeungnam Univ J Med. 1995;12(1):75-83. Published online June 30, 1995; DOI: https://doi.org/10.12701/yujm.1995.12.1.75

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Abstract PDF: Even though phototherapy is an effective means of treating hyperbilirubinemia, adequate binocular shields are essential to prevent light hazard of retina during phototherapy. The phototherapy to young albino rabbits was performed under various conditions; exposured for 12, 24, and 48 hours, continuity or intermittence of irradiation, and use of shields. Although there was no definite pathologic change in indirect ophthalmoscopic examination, severe damage was seen at electron microscopic level. In all experimental groups, swelling and edema of photoreceptor were seen. at right after phototherapy. Futhermore, more severe damage was seen in case of intermittent irradiated group and prolong exposed group. In mydriatic eyes, severity of damage was similiar to non mydi iatic eyes, but area of retinal damage was more extensive than non-mydriatic eves.. In control group which was protected by binocular shields during phototherapy, no significant abnormality was found.

Clinical Study of Cataract Surgery in Diabetic Retinopathy.: Young Hoon Park; Yeungnam Univ J Med. 1994;11(1):153-159. Published online June 30, 1994; DOI: https://doi.org/10.12701/yujm.1994.11.1.153

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Abstract PDF: Extracapsular cataract extraction with posterior chamber intraocular lens in 24 eyes of 24 diabetics. With and without diabetic retinopathy, were followed up postoperatively for an average of 14 months to determine the incidence of diabetic retinopathy, the final visual acuity and factors predictive of progression of retinopathy and final visual acuity. Overall, retinopathy progressed in 52% of operated-on eyes. Cataract extraction was highly associated with progression of diabetic retinopathy. Women had a significantly increased risk of progression of retinopathy in the operated-on eye compared to men. Visual acuity improved in 22 of 24 orerated-on eyes : however, only 11 eyes achieved a visual acuity of 0.5 or better and only 7 eyes achieved a visual acuity of 0.7 or better. Patients treated with oral hypoglycemic agents had a worse visual prognosis than those treated with insulin. The prognosis of patients with diabetic retinopathy about to undergo cataract surgery, even extracapsular cataract extraction with placement of a posterior chamber lens, is guarded.

Clinical observation of the bilateral branch vein occlusion.: Young Hoon Park, Duk Kee Hahn, Sang Beon Lee; Yeungnam Univ J Med. 1993;10(1):77-81. Published online June 30, 1993; DOI: https://doi.org/10.12701/yujm.1993.10.1.77

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Abstract PDF: The clinical evaluation was done in eight eyes of four patients with bilateral branch retinal vein occlusion. The onset of age was from 36 to 65 years, and three pa dents were women. Hypertension was the most common associated systemic disease. Retinal neovascularization was complicated in six eyes, and five eyes had vitreous hemorrhage. The vitrectomy was performed in three eyes. We believe that branch retinal vein occlusion associated with hypertension should be followed carefully in the fellow eyes.

A study of cisplatin nephrotoxicity.: Young Hee Hwang, Kyoung A Lee, Son Moon Shin, Young Hoon Park, Jeong Ok Hah, Chun Dong Kim, Young Hwan Lee; Yeungnam Univ J Med. 1992;9(2):327-333. Published online December 31, 1992; DOI: https://doi.org/10.12701/yujm.1992.9.2.327

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Abstract PDF: To evaluate the nephrotoxicity of cisplatin, serum levels of sodium, potassium, chloride, calcium, phosphorous, magnesium, BUN, creatinine and creatinine clearance were measured before and after administration of cisplatin in 18 cases of patients with malignant neoplasm. The results were as follows: 1) Serum calcium, magnesium, potassium and BUN levels were changed after cisplatin administration, but those changes were not statistically significant. 2) The mean value of creatinine clearance was not decreased significantly after treatment with cisplatin. 3) Acute renal failure was developed in one case, and four cases of hypocalcemia, hypomagnesemia were also detected after administration of cisplatin.

Surgical Treatment for Vitreous Hemorrhage Associated with Branch Retinal Vein Occlusion.: Duk Kee Hahn, Young Hoon Park; Yeungnam Univ J Med. 1992;9(2):211-217. Published online December 31, 1992; DOI: https://doi.org/10.12701/yujm.1992.9.2.211

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Abstract PDF: No abstract available.

Low volume peritoneal dialysis in newborns and infants.: Young Hoon Park, Soo Ho Ahn, Son Moon Shin, Jeong Ok Hah; Yeungnam Univ J Med. 1991;8(2):128-137. Published online December 31, 1991; DOI: https://doi.org/10.12701/yujm.1991.8.2.128

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Abstract PDF: Peritoneal dialysis has been widely considered to be the dialytic treatment of choice for acute renal failure in infants and young children, because the technique is simple, safe and easily adapted for these patients. Also peritoneal dialysis in infants might have more effective ultrafiltration and clearance than in adults. In certain circumstances associated with hemodynamic instability, ordinary volume peritoneal dialysis (30-50 ml/kg body weight per exchange) or hemodialysis may not be suitable unfortunately. But frequent cycled, low volume, high concentration peritoneal dialysis may be more available to manage the acute renal failure of newborns and infants. Seven infants underwent peritoneal dialysis for hemodynamically unstable acute renal failure with low exchange volume (14.2±4.2 ml/kg), short exchange time (30 to 45 minutes) and hypertonic glucose solution (4.25% dextrose). Age was 1.9±1.3 months and body weight was 4.6±1.6 kg. Etiology of acute renal failure was secondary to sepsis with or without shock (5 cases) and postcardiac operation (2 cases). Catheter was inserted percutaneously with pigtail catheter or Tenkhoff catheter by Seldinger method. Dialysate was commercially obtained Peritosol which contained sodium, chloride, potassium, magnesium, lactate and calcium. Net ultrafiltration (ml/min) showed no difference between low volume dialysis and control (0.27±0.09 versus 0.29±0.09). Blood BUN decreased from 95.7±37.5 to 75.7±25.9 mg/dl and blood pH increased from 7.122±0.048 to 7.326±0.063 after 24 hours of peritoneal dialysis. We experienced hyperglycemia which were controlled by insulin (2 episodes), leakage at the exit site (2), mild hyponatremia (1) and Escherichia coli peritonitis (1). Two children of low volume dialysis died despite the treatment. In our experience, low volume and high concentration peritoneal dialysis with frequent exchange may have sufficient ultrafiltration and clearance without significant complications in the certain risked acute renal failure of infants.

Spontaneous involution of subfoveal neovascularization.: Young Hoon Park, Duk Kee Hahn; Yeungnam Univ J Med. 1991;8(1):252-258. Published online June 30, 1991; DOI: https://doi.org/10.12701/yujm.1991.8.1.252

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Abstract PDF: Majority of the eyes with subfoveal neovascular membrane loss the central vision. We observed two patients who regained significant central vision as the result of the involution of subfoveal neovascularization. On follow-up fundus examination, the subretinal lesions revealed grayish neovascular membranes stained with fluorescein, but did not show the fluid leakage. And subretinal hemorrhage and subretinal fluid were gradually resolved. We assumed that functioning retinal pigment epithelium within the macula and young age were the important factors of the spontaneous improvement of visual outcome.

Experimental proliferative vitreoretinopathy.: Young Hoon Park, Bong Hwan Lee, Duk Kee Hahn; Yeungnam Univ J Med. 1991;8(1):178-190. Published online June 30, 1991; DOI: https://doi.org/10.12701/yujm.1991.8.1.178

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Abstract PDF: The authors performed experimental study to produce proliferative vitreoretinopathy by intravitreal injection of homologous fibroblasts in pigmented rabbits. Twenty four eyes of 12 rabbits were divided into control and experimental groups. In experimental group, the eyes were pretreated with expanding gas, perfluoropropane for the vitrectomy. In control group, no such procedure was preceded. In both groups, 5.0×10⁴, 1.0×10⁵ and 1.5×10⁵ cells of homologous fibroblasts were injected into the vitreous cavity. All the eyes were observed regularly with indirect ophthalmoscope followed by fundus photography. Those eyes were enucleated in 1, 2, 4 weeks for the light and electron microscopic studies. The development and severity of the proliferative vitreoretinopathy were correlated with the numbers of the injected fibroblast. This was more pronounced in the experimental group.

A Case of Secondary Glaucoma combined with Mesodermal Dysgenesis of Anterior Segment.: Tae Kwang Ahn, Young Hoon Park, Duk Kee Hahn; Yeungnam Univ J Med. 1990;7(1):187-190. Published online June 30, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.1.187

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Abstract PDF: The authors experienced a case of secondary glaucoma combined with mesodermal dysgenesis of anterior segment, which disclosed extensive peripheral iridocorneal adhesion of congenital origin while his fellow eye revealed a sclerocornea. This case is extremely rare and entirely different from the previously reported Axenfeld's and Rieger's anomalies. We report this interesting case with brief review of the literatures.

Intraocular Pressure Changes in the Uneventful Extra-capsular Cataract Extraction and Extra-capsular Cataract Extraction with Vitreous Loss followed by Anterior Chamber Lens Implantation.: Young Hoon Park, Kyoo Won Lee, Duk Kee Hahn; Yeungnam Univ J Med. 1989;6(1):81-86. Published online June 30, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.1.81

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Abstract PDF: These days the posterior chamber lens implantation following the extracapsular cataract extraction has become the standard procedure except those patients who cannot take it in one reason or another. In past, however, the anterior chamber lens implantation was popular for sometimes. Even now in those patient complicated by vitreous loss, the anterior chamber lens implantation following anterior vitrectomy is indicated in some cases. We have become interested in the difference of the intraocular pressure change in the patients who underwent the uneventful extra-capsular cataract extraction followed by anterior chamber lens implantation in routine manner and in those whose extra-capsular cataract extraction were complicated by vitreous loss and eventually needed the anterior vitrectomy before the anterior chamber lens implantation. We reviewed the medical records of 15 cases of the former group and 11 cases of the latter one in 1986 through 1988. There was some difference in the postoperative pressure in the two groups, but it was not statistically significant.

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