Mao-Hung Lo

Chang Gung Memorial Hospital, Taipei, Taipei, Taiwan

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Publications (4)2.65 Total impact

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    ABSTRACT: Arginine (ARG) metabolites are interrelated and are involved in chronic kidney disease (CKD) and cardiovascular disease. Twenty-four-hour ambulatory blood pressure monitoring (ABPM) appears to correlate with cardiovascular outcomes. We investigated the relationship between ARG metabolites, and their combined ratios in urine, and the ABPM profiles of children and adolescents with CKD. This cross-sectional study included 45 children and adolescents (age, 5-18 years) with stage 1 to 4 CKD. Each child underwent office blood pressure (BP) measurements, 24-hour ABPM, and urinary ARG metabolite determinations. Seventy percent of children with CKD had abnormal 24-hour ABPM profiles, including nocturnal hypertension, increased BP load, and nondipping nocturnal BP. The urinary ARG-to-asymmetric dimethylarginine (ADMA) ratio was lower, and the ADMA-to-symmetric dimethylarginine (SDMA) ratio was higher in children with advanced CKD (stages 2-4) than those with stage 1 CKD. CKD patients with BP abnormalities also had reduced urinary ARG and dimethylamine (DMA) levels. The higher urinary (ADMA+SDMA)-to-ARG ratios were correlated to ABPM abnormalities, including increased systolic BP load and non-dipping nocturnal BP. ABPM abnormalities were significantly associated with a high urinary (ADMA+SDMA)-to-ARG ratio, suggesting the possible involvement of methylated ARG in the development of hypertension among children with CKD.
    Journal of the American Society of Hypertension (JASH) 10/2012;
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    ABSTRACT: OBJECTIVE: Small-bore pigtail catheters have been found to be effective in the treatment of primary spontaneous pneumothorax (PSP) in adults. The aim of this study was to compare the effectiveness of small-bore pigtail and large-bore catheters in the treatment of PSP in young adolescents. MATERIALS AND METHODS: Young adolescents (<18 years) with initial PSP were treated with aspiration (control group), small-bore pigtail catheters or large-bore catheters. Treatment was determined on a case-by-case basis with parental consultation. Success rate, recurrence rate (within 12 months), duration of hospital stay, duration of catheter insertion, and complications were analysed. MAIN RESULTS: There were 41 patients treated: aspiration, n=8; small-bore pigtail catheters, n=10; large-bore catheters, n=23. Demographic and baseline clinical characteristics were similar between groups. The success rates were 50.0% and 65.2% in the small-bore pigtail and large-bore catheter groups, respectively. Corresponding recurrence rates were 20.0% and 56.5%. There was no difference between the small-bore pigtail and large-bore catheter groups in the duration of hospital stay in patients for whom treatment was successful; however, the duration of catheter insertion was significantly shorter in the small-bore pigtail catheter group compared with the large-bore catheter group in patients for whom treatment was successful (p<0.05). There were no major complications in either catheter treatment group and few minor complications (small-bore pigtail catheter, n=2; large-bore catheter, n=4). CONCLUSIONS: The findings suggest that small-bore pigtail catheters may be as effective as large-bore catheters for the initial treatment of PSP in young adolescents.
    Emergency Medicine Journal 04/2012; · 1.65 Impact Factor
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    ABSTRACT: Pediatric patients with atrial septal defect (ASD) may have failure to thrive. This study aimed to investigate body weight changes in pediatric patients after transcatheter closure of ASD. From June 2003 to September 2008, we enrolled 60 pediatric patients who underwent transcatheter closure of ASD. Changes in body weight percentile, heart rate, and resolution of right ventricular hypertrophy were compared before and after ASD closure. Patients were divided into two groups according to initial weight percentile: group A, <50(th) percentile (n = 39) and group B, ≥50(th) percentile (n = 21). Echocardiography and routine weight measurements were performed before the procedure and at 3, 6, and 12 months during follow-up. Clinical presentations, laboratory data, and outcomes were measured. Increased body weight percentile (41±4 vs. 48±4, p<0.01), lower heart rate (100±2 beats/min vs. 89±2beats/min, p<0.01), and resolution of right ventricular hypertrophy (59/60 vs. 1/60, p<0.01) were achieved after ASD closure at the 12-month follow-up. Patients in group A were significantly younger (4.6±0.5 years vs. 7.0±0.9 years, p = 0.016), had a higher pulmonary/systemic blood flow ratio (2.2±0.1 vs. 1.8±0.l, p = 0.044), a largerratio of ASD diameter/body surface area (25.0±1.4 vs. 16.4±1.9, p<0.01), and higher percentage of weight gain increase ≥ 5 percentile compared with patients in group B (22/39 vs. 6/21, p = 0.039). Transcatheter closure of ASD positively affects weight gain. An increase of 7 percentile weight was observed at 1 year of follow-up. Patients with a younger age, higher pulmonary/systemic blood flow ratio, and a larger ratio of ASD diameter/body surface area may have better weight gain after ASD closure.
    Journal of the Formosan Medical Association 07/2011; 110(7):467-72. · 1.00 Impact Factor
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    ABSTRACT: Purpose: To investigate the outcome of outlet-type ventricular septal defect (VSD) after surgery in pediatric patients. Methods: A total of 152 children who underwent surgical repairs for outlet-type VSD were enrolled. Clinical features associated with development of congestive heart failure (CHF), aortic valve prolapse (AVP), and aortic regurgitation (AR) were analyzed. Results: CHF was noted in 34 (22.4%) of 152 patients. Patients with CHF had a larger VSD size (p < 0.0001), a higher Qp/Qs ratio (p < 0.0001), and a higher mean pulmonary pressure (p < 0.0001) compared with patients without CHF. AVP was noted in 106 (69.7%) of 152 patients. Patients with AVP had an older operation age (p < 0.0001), a smaller Qp/Qs ratio (p < 0.0001), a higher systolic pressure gradient between the left and right ventricles (p < 0.0001), and a higher diastolic pressure gradient between the aorta and the right ventricle (p = 0.022) compared with the patients without AVP. Among 43 (28.3%) patients with AVP and AR, 17 had mild and 4 had moderate-severe AR after surgery. Severe AVP (p = 0.0231) and pre-operative AR (p < 0.001) are two risk factors for the presence of postoperative residual AR. Conclusion: Long-term outcome of surgical repairs for outlet-type VSD is excellent in most pediatric patients without severe CHF or moderate-severe AR. AVP and AR are more frequent and severe in patients with delayed surgery, highlighting the importance of early surgical treatment of outlet-type VSD.