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Taoyuan City, Taiwan

Huang S.-C.,Chang Gung Memorial Hospital | Wong M.-K.,Chang Gung Memorial Hospital | Lin P.-J.,Gung Memorial Hospital | Tsai F.-C.,Gung Memorial Hospital | And 4 more authors.
PLoS ONE | Year: 2015

Hemodynamic properties affected by the passive leg raise test (PLRT) reflect cardiac pumping efficiency. In the present study, we aimed to further explore whether PLRT predicts exercise intolerance/capacity following coronary revascularization. Following coronary bypass/percutaneous coronary intervention, 120 inpatients underwent a PLRT and a cardiopulmonary exercise test (CPET) 2-12 days during post-surgery hospitalization and 3-5 weeks after hospital discharge. The PLRT included head-up, leg raise, and supine rest postures. The end point of the first CPET during admission was the supra-ventilatory anaerobic threshold, whereas that during the second CPET in the outpatient stage was maximal performance. Bio-reactance-based non-invasive cardiac output monitoring was employed during PLRT to measure real-time stroke volume and cardiac output. A correlation matrix showed that stroke volume during leg raise (SVLR) during the first PLRT was positively correlated (R = 0.653) with the anaerobic threshold during the first CPET. When exercise intolerance was defined as an anaerobic threshold < 3 metabolic equivalents, SVLR / body weight had an area under curve value of 0.822, with sensitivity of 0.954, specificity of 0.593, and cut-off value of 1504-10-3mL/kg (positive predictive value 0.72; negative predictive value 0.92). Additionally, cardiac output during leg raise (COLR) during the first PLRT was related to peak oxygen consumption during the second CPET (R = 0.678). When poor aerobic fitness was defined as peak oxygen consumption < 5 metabolic equivalents, COLR/body weight had an area under curve value of 0.814, with sensitivity of 0.781, specificity of 0.773, and a cut-off value of 68.3 mL/min/kg (positive predictive value 0.83; negative predictive value 0.71). Therefore, we conclude that PLRT during hospitalization has a good screening and predictive power for exercise intolerance/capacity in inpatients and early outpatients following coronary revascularization, which has clinical significance. © 2015 Huang et al.

Hsu S.-Y.,Buddhist Tzu Chi General Hospital | Hsu S.-Y.,Tzu Chi University | Chang S.-H.,Second Section of Cardiology | Liu C.-J.,Buddhist Tzu Chi General Hospital | And 7 more authors.
Journal of Investigative Medicine | Year: 2013

Background: The frequency and clinical correlates of global right ventricular (RV) dysfunction in patients treated with primary percutaneous coronary intervention for a first acute ST-elevation myocardial infarction (STEMI) without a coexisting RV infarction is not well known. Materials and Methods: One hundred seven consecutive patients underwent conventional echocardiography and pulsed-wave tissue Doppler imaging (TDI) within 72 hours after a successful primary percutaneous coronary intervention to assess their RV function. Global RV function was quantified with the RV myocardial performance index (MPI) by pulsed-wave TDI. An abnormal TDI-derived RV MPI was defined as greater than the upper reference limit of 0.55. Results: Global RV dysfunction was present in 18 (17%) of the 107 patients enrolled. The patients with global RV dysfunction had significantly higher glucose levels on admission (216 ± 102 vs 163 ± 86 mg/dL; P = 0.027), higher peak creatine kinase (4027 ± 2171 vs 2660 ± 1980 IU/L; P = 0.014), and more frequently had anterior infarcts (89% vs 58%; P = 0.016) than those without RV dysfunction. Patients with global RV dysfunction also had a significantly lower left ventricular (LV) ejection fraction (45.1 ± 10.8% vs 51.1 ± 9.7%; P = 0.021), a higher global wall motion score index (1.9 ± 0.3 vs 1.7 ± 0.4; P = 0.007), and greater LV MPI (0.65 ± 0.19 vs 0.47 ± 0.11; P = 0.001) than patients without. With the use of multivariate regression analysis, TDI-derived LV MPI (odds ratio [OR], 3.40; 95% confidence interval [CI], 1.20-9.67; P = 0.022), the ratio of transmitral peak early (E) to late diastolic filling (A) velocities (E/A ratio) (OR, 0.41; 95%CI, 0.18-0.92; P = 0.031), and admission plasma glucose level (OR, 1.01; 95% CI, 1.0-1.02; P = 0.039) were independently associated with the presence of global RV dysfunction. Conclusions: In patients with a first acute STEMI without an associated RV infarction, depressed global LV function reflected by increased TDI-derived LV MPI, a lower mitral E/A ratio, and a higher glucose level on admission are independent correlates of early global RV dysfunction. Routine assessment of global RV function should be implemented in patients with STEMI with these characteristics. Copyright © 2013 by The American Federation for Medical Research.

Lee C.-H.,Second Section of Cardiology | Lee C.-H.,Chang Gung University | Chen C.-J.,Chang Gung University | Liu S.-J.,Chang Gung University | And 2 more authors.
Annals of Biomedical Engineering | Year: 2012

In this report, a balloon-expandable, biodegradable, drug-eluting bifurcation stent (DEBS) that provides a sustainable release of anti-proliferative sirolimus was developed. Biodegradable bifurcation stents, made of polycaprolactone, were first manufactured by injection molding and hot spot welding techniques. Various properties of the fabricated stents, including compression strengths, collapse pressures, and flow pattern in a circulation test, were characterized. The experimental results showed that biodegradable bifurcation stents exhibited comparable mechanical properties with those of metallic stents and superior flow behavior to that of metallic bifurcation stents deployed via the T And small Protrusion approach. Polylactide- polyglycolide (PLGA) copolymer and sirolimus were then dissolved in acetonitrile and coated onto the surface of the stents by a spray coating device. An elution method and a high performance liquid chromatography analysis were utilized to examine the in vitro release characteristics of sirolimus. Biodegradable bifurcation stents released high concentrations of sirolimus for more than 6 weeks, and the total period of drug release could be prolonged by increasing the drug loading of the PLGA/sirolimus coating layers. In addition, the eluted drug could effectively inhibit the proliferation of smooth muscle cells. The developed DEBS in this study may provide a promising strategy for the treatment of cardiovascular bifurcation lesions. © 2012 Biomedical Engineering Society.

Hsu S.-Y.,Buddhist Tzu Chi General Hospital | Hsu S.-Y.,Tzu Chi University | Lin J.-F.,Buddhist Tzu Chi General Hospital | Lin J.-F.,Tzu Chi University | Chang S.-H.,Second Section of Cardiology
American Journal of the Medical Sciences | Year: 2011

INTRODUCTION: To investigate the effect of different infarction sites on right ventricular (RV) functional changes in patients with a first acute ST-elevation myocardial infarction without concomitant RV infarction. METHODS: Sixty consecutive patients underwent conventional echocardiography and pulsed-wave tissue Doppler imaging for RV function evaluation after successful primary percutaneous coronary intervention. They were divided into 2 groups according to infarct location based on the electrocardiographic findings: group I consisted of 35 patients with anterior (including anteroseptal) wall infarction and group II included 25 patients with inferior (including inferoposterior) wall infarction. Ten healthy individuals served as the control group. RESULTS: The tricuspid annular plane systolic excursion was significantly lower in group I compared with that in the controls (20.3 ± 3.8 versus 23.9 ± 2.4 mm, P < 0.05). The ratio of transtricuspid peak early filling velocity to tricuspid annular early diastolic velocity (E/Em) was comparable between group I and group II, whereas it was higher in group II than in the controls (6.10 ± 1.37 versus 4.33 ± 1.17, P < 0.05). The RV myocardial performance index determined by tissue Doppler imaging was significantly higher in group I than in group II (0.48 ± 0.25 versus 0.32 ± 0.10, P < 0.05) and the healthy controls (0.48 ± 0.25 versus 0.27 ± 0.08, P < 0.05). CONCLUSIONS: In patients with a first, acute reperfused ST-elevation myocardial infarction without associated RV infarction, RV function may be affected discrepantly depending on the different infarction sites. In patients with inferior infarction without concomitant RV infarction, only regional RV diastolic dysfunction is observed, whereas the alteration of global RV function is more pronounced in patients with anterior wall infarction. © 2011 Lippincott Williams &Wilkins.

Huang S.-C.,Chang Gung Memorial Hospital | Huang S.-C.,Chang Gung University | Wong M.-K.,Chang Gung Memorial Hospital | Lin P.-J.,Chang Gung Memorial Hospital | And 5 more authors.
European Journal of Applied Physiology | Year: 2014

Purpose Although high-intensity interval aerobic training (HIT) effectively improves aerobic fitness, the risk of cardiac arrest transiently increases during strenuous physical exertion in patients with cardiovascular disease. For safety and efficacy concerns, this investigation explored the effect of a modified HIT (mHIT) on exertional ventilatory-hemodynamic efficiency in heart failure patients with reduced ejection fraction (HFREF). Methods HFREF patients were prospectively assigned to two groups: mHIT and usual healthcare (UC). The former comprised supervised continuous aerobic training at ventilatory anaerobic threshold for 50 min/day, 3 days/week for 4 weeks, and then 3-min intervals at 40 and 80 % VO2 reserve for 50 min/day, 3 days/week for 8 weeks. The latter received optimal medical treatment only. Ventilatory and hemodynamic responses during exercise were measured before and after the intervention. Paired-t and repeated measures ANOVA with post hoc tests were adopted. Results Each group had an N of 33. The mHIT and UC group had matched baseline characteristics including health-promotion concept and behavior score. The mHIT for 12 weeks (1) increased VO2, cardiac output, and notably, cardiac power output at peak workload (1,151 ± 573 vs. 1,306 ± 596 L/min/mmHg); (2) reduced VE/VO2 (32.4 ± 4.6 vs. 30.0 ± 4.0), breathing frequency, ventilation, and enhanced stroke volume compliance at identical submaximal intensity (50 % peak workload at pre-intervention evaluation). No significant changes in ventilatory and hemodynamic responses to exercise were observed following the UC. Conclusions The mHIT regimen improves peak cardiac pumping capacity with reducing cardiac after-load and simultaneously increases ventilation efficiency during exercise in patients with HFREF. Thereby, aerobic fitness is ameliorated. © 2014 Springer-Verlag Berlin Heidelberg.

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