Biomedical subjects

Hsin Chi

Publications and source records attributed to Hsin Chi.

11 recordsLinked to original sources

PubMed2025

HLA-DRB115:01 Is Associated and Linked With Kawasaki Disease, With DRB114:01 Conferring Risk to Coronary Artery Lesions: Case-Control and Family-Based Studies.

Kawasaki disease (KD), also known as mucocutaneous lymph node syndrome, is a leading cause of vasculitis in children aged < 5 years. The HLA complex has been investigated for its association with KD since 1978 without conclusive results due to limitations such as small sample sizes. This study aimed to evaluate the associations and genetic linkage between HLA-DRB1 and KD, as well as its complications. The case-control and family-based studies enrolled 795 patients with KD and 946 healthy controls. Of the 795 patients, 180 trios were included. Genotypes of HLA-DRB1 were identified by sequence-based typing according to the International ImMunoGeneTics database. Allele frequencies were calculated using PyPop 7.0. The transmission/disequilibrium test (TDT) was used to verify the genetic linkage between HLA-DRB1 and KD. HLA-DRB1*15:01 was significantly associated with KD (OR, 1.44, Pc = 0.03) and with KD without CALs (OR = 1.46, Pc = 0.04). HLA-DRB1*14:01 was a risk factor for KD with CALs (OR = 2.47, Pc = 0.004) whereas HLA-DRB1*12:02 was a protective factor against CALs (OR = 0.49, Pc = 0.01). In the family-based study, HLA-DRB1*15:01 demonstrated significant overtransmission to KD patients (OR = 3.35; 95% CI, 2.20-5.78; Pc = 1.19E-06) and to KD patients without CALs (OR = 4.42; 95% CI, 2.59-10.08; Pc = 6.24E-06). The overtransmission remained significant in male KD patients (OR = 2.81; 95% CI, 1.68-5.58; Pc = 0.003), and in male KD patients without CALs (OR = 3.22; 95% CI, 1.69-8.84; Pc = 0.02). Our study identified significant associations between HLA-DRB1*15:01, *14:01, and *12:02 with KD. The association between HLA-DRB1*15:01 and KD was further verified by TDT, indicating a genetic linkage between the HLA-DRB1 locus and KD susceptibility.

Humans↗

PubMed2006

Genetic variations of HLA-DRB1 and susceptibility to Kawasaki disease in Taiwanese children.

Although some previous studies have reported that genetic and immunologic factors play important roles in the pathogenesis of Kawasaki disease (KD), the etiologic factors of this enigmatic pediatric disease are still poorly understood. The purpose of this study was to investigate whether polymorphisms of the human leukocyte antigen DRB1 (HLA-DRB1) gene are associated with KD and the development of coronary artery lesions (CAL) in Taiwanese children. Genomic DNA was extracted from whole blood samples from 145 children with KD and 331 healthy controls. The HLA-DRB1 gene was genotyped by polymerase chain reaction (PCR) and sequence-based typing assays. We found that the distribution of HLA-DRB1 allele families and alleles in children with KD did not differ from that in healthy controls. Stratified analysis did not demonstrate any association between particular HLA-DRB1 allele families or alleles and the development of CAL in children with KD. These findings suggest that susceptibility to KD and CAL is not associated with the HLA-DRB1 gene in a Taiwanese population. If immunogenetic determinants are involved in this disease and its complications in Taiwanese children, they must involve genes other than HLA-DRB1.

Child↗

PubMed2006

Systemic cat scratch disease.

Systemic cat scratch disease (CSD) is often associated with prolonged fever and microabscesses in the liver and/or spleen. We report a case of systemic CSD with hepatic, splenic and renal involvement in an aboriginal child in Taiwan. A previously healthy 9-year-old girl had an intermittent fever for about 17 days, and complained of abdominal pain, headache and weight loss. Abdominal computed tomography showed multiple tiny hypodense nodular lesions in the spleen and both kidneys. Laparotomy revealed multiple soft, whitish-tan lesions on the surface of the liver and spleen. Histopathologic examination of a biopsy specimen of the spleen showed necrotizing granulomatous inflammation with central necrosis surrounded by epithelioid cells and occasional Langhans' giant cells, strongly suggestive of Bartonella henselae infection. History revealed close contact with a cat. B. henselae DNA was detected by polymerase chain reaction in the tissue specimen, and the single antibody titer against B. henselae was greater than 1:2048. These results confirmed the diagnosis of visceral CSD caused by B. henselae. The patient's symptoms resolved after treatment with rifampin and tetracycline. This case illustrates the need for inclusion of systemic CSD in patients with fever of unknown origin and abdominal pain.

Animals↗

PubMed2006

T-antigen activation for prediction of pneumococcus-induced hemolytic uremic syndrome and hemolytic anemia.

BACKGROUND: Among the most severe complications of invasive pneumococcal infection are hemolytic uremic syndrome (P-HUS) and hemolytic anemia (P-HA), which occur when the Thomsen-Freidenreich antigen (TA) is exposed on erythrocytes, platelets and glomeruli. METHODS: To determine the positive predictive value, sensitivity, and specificity of early TA activation testing for P-HUS or P-HA and to compare the microbiologic features of pneumococcus isolates associated or not associated with TA activation. The case records for 36 patients with invasive pneumococcal infection who had been tested for TA activation were retrospectively reviewed. Clinical and laboratory data were compared between patients with and without TA activation. RESULTS: Positive TA activation was 86% sensitive and 57% specific for P-HUS or P-HA. The positive predictive value was 76%. There were no between-group differences in antibiotic susceptibility of the pneumococcal isolates. Pneumococcal serotype 14 was the most frequent (5/10 isolates tested) serotype causing P-HUS. Of the 36 patients, 13 required packed red blood cell transfusion, 3 died, and 2 required extracorporeal membrane oxygenation. No patient had long-term renal sequelae. CONCLUSIONS: TA activation is a reasonable predictor of P-HUS or P-HA and could be useful if tested soon after invasive pneumococcal disease is first diagnosed.

Anemia, Hemolytic↗

PubMed2006

Life tables and development of Bemisia argentifolii (Homoptera: Aleyrodidae) at different temperatures.

The life history of Bemisia argentifolii Bellows & Perring (Homoptera: Aleyrodidae) on tomato (Lycopersicum spp.) was studied based on the age-stage, two-sex life table at 15, 20, 25, 28, 30, and 35 degrees C. The intrinsic rate of increase (r) at these temperatures is -0.0176, 0.0667, 0.1469, 0.1611, 0.1745, and 0.0989 d(-1), respectively. The relationship among the gross reproductive rate (GRR), the net reproductive rate (R0), and the preadult survivorship (l(a)) is consistent with GRR > l(a) x GRR > R0 for all results at different temperatures. The mean generation time is 81.9, 48.6, 28.4, 25.3, 22.1, and 18.2 d, respectively. The developmental rate of the egg stage at different temperatures fit a linear equation with a thermal summation 89.2 degree-days and a developmental threshold of 11.4 degrees C. The developmental rates of the nymphal stage fit the model of Stinner et al. and the parameters of C, Rmax, k1 and k2 were 0.085, 0.0833, 5.298, and -0.263, respectively.

Age Factors↗

PubMed2005

Characteristics of primary osteomyelitis among children in a medical center in Taipei, 1984-2002.

BACKGROUND AND PURPOSE: The presentation and sequelae of osteomyelitis are variable. This study evaluated the clinical manifestations and outcome of osteomyelitis in children in different age groups, and in different periods before and after the implementation of National Health Insurance (NHI). METHODS: The records of pediatric patients with osteomyelitis treated at a medical center in Taipei from 1984 to 2002 were reviewed. Clinical features, pathogens, laboratory and imaging findings, treatment, and outcome were analyzed. The patients were stratified into 3 groups based on age: infants (< or = 3 months of age), young children (between 4 months and 5 years), and older children and adolescents (> 5 years). Based on the date of implementation of the NHI program, the study period was divided into 2 stages: prior to implementation, from January 1984 to February 1995; and after implementation, from March 1995 to December 2002. RESULTS: The records of 209 patients were reviewed, including 45 infants, 77 young children, and 87 older children. The most common presenting findings were local tenderness (79%), local swelling (72%), and fever (57%). The lower limbs were the most commonly involved sites (65%). Staphylococcus aureus (34%), Mycobacterium tuberculosis (10%), Salmonella species (7%), and Pseudomonas aeruginosa (6%) were the most frequently isolated pathogens. At the time of diagnosis, abnormalities were found on radiographs in 83% of patients and on radionuclide bone scans in 86%. Surgical intervention with local debridement and curettage was performed in 102 patients (49%). Sixty five patients (31%) developed complications, including specific bony sequelae in 26 (12%). Sepsis and septic arthritis were more common in infants (p < 0.01). A history of trauma, protracted course of osteomyelitis, and surgical intervention were more common in older children and adolescents (p < 0.01). After the implementation of NHI, a larger proportion of patients had negative cultures (p < 0.01), and the mean duration of antibiotic therapy was shorter (p = 0.01). CONCLUSIONS: The clinical characteristics of osteomyelitis associated with sepsis or septic arthritis, chronic changes, and the need for surgery may differ depending on the age of the child. S. aureus, M. tuberculosis, and salmonellae were the most common pathogens in this Taiwanese series. Implementation of NHI in the more recent decade of the study period was associated with a shorter duration of intravenous antibiotic administration.

Adolescent↗

PubMed2005

Comparison of the characteristics of culture-negative versus culture-positive septic arthritis in children.

Septic arthritis in children can be difficult to diagnose and may be associated with severe morbidity. A majority of apparent septic arthritis cases may have negative culture, thereby creating a dilemma regarding treatment. The medical charts of 209 children with the diagnosis of septic arthritis were retrospectively reviewed to evaluate the differences between culture-negative (n = 64) and culture-positive (n = 145) cases. Demographic data, clinical manifestations, treatment, and outcome were analyzed. Laboratory data recorded included white blood cell count, erythrocyte sedimentation rate, C-reactive protein, imaging studies, and culture results. Patients with culture-negative arthritis had a significantly lower incidence of fever (56.3% vs 70.3%, p=0.047), local pain or tenderness (42.2% vs 69.7%, p=0.0001), changes in the overlying skin (45.3% vs 62.1%, p=0.024), motion limitation (25.0% vs 42.8%, p=0.014), and osteomyelitis (25.0% vs 40.7%, p=0.029). Culture-negative patients had a longer duration of symptoms or signs before diagnosis (10.1 +/- 8.9 days vs 6.5 +/- 5.7 days, p=0.046) and a shorter antimicrobial course (24.5 +/- 5.1 days vs 35.7 +/- 8.1 days, p=0.001). Children with culture-negative septic arthritis had a lower prevalence of residual joint dysfunction at 6 months after treatment (3.1% vs 11.7%, p=0.046). In conclusion, children with culture-negative septic arthritis have milder clinical manifestations, earlier response to treatment, and a better outcome than those with culture-positive disease.

Adolescent↗

PubMed2004

Characteristics of nosocomial bacterial meningitis in children.

Nosocomial meningitis is uncommon in children. We reviewed the medical records of all children who developed bacterial meningitis at least 72 hours after admission to Mackay Memorial Hospital for the period July 1992 through June 2000. Clinical manifestations, predisposing factors, pathogens, and outcomes were analyzed. Twenty-two cases of nosocomial meningitis were identified, comprising 9.2% (22/239) of all pediatric cases of bacterial meningitis during the study period. The male-to-female ratio was 14:8. All patients were younger than 6 months of age except for one, who was 7 years old. The mean duration between admission and onset of meningitis was 15.3 days (range, 3 to 58 days). Twenty-two organisms were isolated, including 13 Gram-negative bacteria (59%) and 9 Gram-positive bacteria (41%). The most common pathogen was Escherichia coli (5 cases), followed by Enterobacter cloacae (3), Staphylococcus aureus (3), and Chryseobacterium meningosepticum (3). Seventeen patients (77%) had concomitant bacteremia. Predisposing factors for acquisition of nosocomial meningitis included previous treatment with broad-spectrum antibiotics (68%), prematurity with very low birth weight (41%), and total parenteral nutrition (32%). Two patients (9%) had previous neurosurgical intervention. Four patients (18%) died, 3 of whom were low birth weight premature infants. Nine patients (41%) had sequelae, including developmental delay, hydrocephalus, hearing impairment, and epilepsy. Neurosurgery was not a significant risk factor for the development of nosocomial meningitis, while very low birth weight played an important role. Previous intraventricular hemorrhage or hydrocephalus, prematurity with very low birth weight, infection with Gram-negative bacteria, and prior broad-spectrum antibiotic administration were associated with poor outcome.

Bacterial Infections↗

PubMed2003

Etiology of acute pharyngitis in children: is antibiotic therapy needed?

Acute pharyngitis is a common upper respiratory tract disease in children. The aim of this study is to find the associated microorganisms and determinate whether antibiotics is needed. This study included a total of 416 children with a diagnosis of acute pharyngitis who were treated in an outpatient clinic In Taipei. Throat swabs for viral and bacterial cultures were taken. Antibiotics were prescribed when bacterial pharyngitis was suspected on the initial visit. The prescription was adjusted according to the results of bacterial culture and clinical manifestations on the second visit 3 to 4 days later. The mean age of the patients was 52.9 +/- 36.9 months. A total of 297 potential pathogens were isolated in 242 patients. Viruses were isolated in 123 (29.6%) patients. Bacteria were isolated in 73 (17.5%) patients, whereas group A streptococci were isolated in only 7 (1.7%) patients. Viruses mixed with bacteria were found in 46 (11.1%) patients. The mean age of patients with viral infections was lower than those with bacterial infections (47.5 +/- 30.4 vs 62.4 +/- 43.7 months, p = 0.01). There was a longer duration of fever in patients older than 2 years with viral isolates (p < 0.01). Antibiotics were prescribed for acute pharyngitis on the first visit in 43 (10.3%) patients, and on the second visit in 19 (4.6%) patients. In children with viral infection, mixed isolates, or no growth, there was significantly less prescription of antibiotics on the second visit. Given the low isolation rate of significant bacterial pathogens, routine throat cultures and antibiotics are not indicated in children with acute pharyngitis.

Acute Disease↗

PubMed2002

Acute suppurative thyroiditis in children.

BACKGROUND: Acute suppurative thyroiditis in children is rare and is often related to a pyriform sinus fistula or thyroglossal duct remnant, especially when it is recurrent. METHODS: From January, 1985, through December, 2000, 15 children with acute suppurative thyroiditis were treated. Their clinical, laboratory and radiologic findings were reviewed and analyzed. RESULTS: There were 8 girls and 7 boys, with a mean age at diagnosis of 6.1+/-2.9 years (range, 1.5 to 9.8). A thyroid mass was present on the left in 13 and on the right in 2 (P < 0.05). Fever, neck pain and swelling were the most common symptoms and signs. Seven patients (46.7%) had recurrent disease. Needle aspiration for Gram stain and bacterial cultures were done, and pathogenic organisms were identified on culture in 8 patients but were found only on Gram stain in 2 patients. In one-half of the patients with positive cultures, mixed pathogens were found. The most common organisms isolated were streptococcal species (50%). Barium esophagography was performed in all patients, and 5 (33.3%) had a pyriform sinus fistula on the left. Only 1 of the recurrent patients had a fistula. Thyroid scans were performed in 13 patients, of whom 12 (92.3%) had decreased radioactive uptake. Thyroid function tests were normal in all 15. CONCLUSIONS: Acute suppurative thyroiditis is usually caused by oropharyngeal flora, resulting in mixed pathogens on culture. Broad spectrum antibiotics should be given once cultures have been obtained. Imaging studies might be helpful in the diagnosis of acute suppurative thyroiditis.

Acute Disease↗

PubMedDate not supplied

Congenital coxsackievirus B5 infection: report of one case.

In infants and children, enterovirus (EV) infections are very common. In neonates, EV infections may lead to fatal myocarditis, encephalitis, or necrotizing hepatitis. Transplacental viremia before delivery is possible but has only been demonstrated occasionally. The presence or absence of passively acquired maternal antibody specific for the infecting EV serotype plays the most important role in neonatal EV infections. We report a fatal case of congenital coxsackievirus B5 infection, confirmed by culture of the virus from the patient's throat and rectal swab and from his mother's throat. The mother had suffered from fever for 1 week since 9 days before delivery. Fever subsided 2 days before the day of delivery, but absence of fetal movements was noted. The newborn's 4-year-old elder sister also had suffered from fever with upper respiratory symptoms during the same period. Fever occurred in this baby immediately after birth by cesarean section, suggesting the presence of transplacental virus transmission.

Enterovirus B, Human↗