Background: ST-segment elevation myocardial infarction (STEMI) is one of the leading causes of morbidity and mortality in developed countries. Therefore, understanding the prevalence and trends of major risk factors may facilitate primary and secondary prevention of STEMI. Methods: In the present study, 2446 consecutive patients with STEMI admitted to Far Eastern Memorial Hospital from 2005 to 2016 were enrolled. A comprehensive analysis of the prevalence, distribution, and trends over time of major risk factors as well as Framingham risk scores of all patients was performed. Results: The most prevalent risk factors were male sex, hypertension (HTN), smoking, age, dyslipidemia, and diabetes mellitus. Furthermore, 95%-97% of the patients had at least one modifiable risk factor, and < 1% of the patients did not have any identifiable risk factors. The prevalence trends of smoking, HTN, dyslipidemia, and metabolic syndrome increased significantly from 2005 to 2016. Seasonal variation analysis revealed a 15% increase in STEMI cases between January and March compared with those between April and December. Isolated low high-density lipoprotein-cholesterol syndrome was the second most common type of dyslipidemia, with a prevalence rate of 16.6%. Moreover, only 56.8% of the male and 32% of the female patients were in the Framingham high-risk group. Conclusion: A high prevalence rate and an increasing trend of modifiable risk factors resulted in a high number of STEMI cases at our hospital. Controlling modifiable risk factors and improving nontraditional risk factor detection could facilitate primary and secondary preventions for STEMI.
Background: Ticagrelor is initially prescribed after an ST-elevated myocardial infarction (STEMI) and this may be followed by a switch to clopidogrel. However, studies involving antiplatelet switching have been conflicting and only assessed at a specific switch point. The objective of this study was to investigate switching from ticagrelor to clopidogrel in an Asian population, after accounting for various switch points as in a real-world environment. Methods: A retrospective cohort of 349 STEMI patients started on ticagrelor and aspirin were followed-up for 1 year after a percutaneous coronary intervention that was performed between June 2014 and November 2016. Patients who switched to clopidogrel were compared with those who remained on ticagrelor. Outcomes measured were major adverse cardiac and cerebrovascular events (MACCEs) and clinically significant bleeding (CSB). Cox regression analysis with switch status as a time-dependent covariate was performed. Results: The switched group was not associated with MACCEs or CSB [10.0% vs. 13.8%; hazard ratio (HR) = 0.484; 95% confidence interval (CI): 0.196- 1.191; p = 0.114]. There was also no significant difference when MACCEs were analyzed alone (2.3% vs. 7.7%; HR = 0.518; 95% CI: 0.137-1.957; p = 0.332). For CSB, the switched group was less likely to have an event (7.8% vs. 8.5%; HR = 0.298; 95% CI: 0.091-0.982; p = 0.047). Conclusions: This study showed no significant difference between staying on ticagrelor and switching to clopidogrel. Switching might decrease the incidence of CSB. De-escalation from ticagrelor to clopidogrel could translate to cost savings for Asian patients without compromising safety and efficacy.
Background: The purpose of this study was to investigate the clinical significance of elevated plasma high-sensitivity troponin T (hs-TnT) in the chronic phase in patients with stable angina pectoris (SAP) who underwent a successful percutaneous coronary intervention (PCI). Methods: This study enrolled 158 consecutive SAP patients who underwent routine follow-up coronary angiography 9 months after a successful PCI with the implantation of a second-generation drug-eluting stent. Patients with previous coronary artery bypass graft and renal dysfunction were excluded. Patients were divided into two groups according to hs-TnT plasma level at follow-up: elevated hs-TnT (≥ 0.015 ng/ml) group and non-elevated hs-TnT group. Result: Among the 158 subjects, 42 had an elevated hs-TnT level at follow-up. The elevated hs-TnT group had a significantly higher rate of any coronary lesion (in-stent restenosis and de novo lesions) in follow-up CAG (coronary angiography) than the non-elevated group (28.6% vs. 10.3%, p < 0.05). Multivariate analysis also showed that hs-TnT elevation was independently associated with the presence of significant coronary stenosis in the chronic phase (odds ratio: 3.99, 95% confidence interval: 1.38 to 11.53). The best cut-off value of the hs-TnT level at 9 months after a successful PCI to predict the presence of significant coronary stenosis was 0.016 ng/ml (sensitivity: 50.0%; specificity: 82.1%; area under the receiver operating characteristic curve: 0.67). Conclusions: hs-TnT elevation was independently associated with the presence of coronary stenosis in the chronic phase in SAP patients with successful PCI. Routine measurement of hs-TnT in the chronic phase may be useful to refine the risk of patients after PCI.
Background: It has been reported that infectious agents contribute to the atherosclerotic process. However, it is unclear whether Staphylococcus aureus superantigen (SAg) toxic shock syndrome toxin-1 (TSST-1) has an effect on atherosclerosis progression. The present study was designed to investigate the pathogenic role of TSST-1 exposure in the atherosclerotic process in rabbits. Methods: New Zealand White rabbits were exposed to TSST-1 through Alzet miniosmotic pumps with a constant pumping rate. Aortic atherosclerosis was evaluated by histological and morphometric methods. Using a biochemical analyzer/enzyme-linked immunosorbent assay/immunostaining, we further analyzed various atherosclerosis-related factors. Results: The gross atherosclerotic lesion area in the aortic arch increased by 15.3% in high-fat-diet rabbits exposed to TSST-1 compared to that in the control group. In the atherosclerotic lesions, TSST-1 exposure increased the content of smooth muscle cells. Moreover, TSST-1 treatment up-regulated serum tumor necrosis factor alpha (TNF-α) level, but did not affect serum lipids (except for triglycerides) and endotoxin in the rabbits. Conclusions: Our data validated that chronic stimulation with TSST-1 facilitates the progression of atherosclerosis in rabbits independently of endotoxins, indicating that S. aureus and its SAgs may be targets to prevent and treat atherosclerosis.
Background: Data is limited on baseline left atrial (LA) myocardial mechanics between apical hypertrophic cardiomyopathy (ApHCM) patients who develop non-valvular atrial fibrillation (NVAF) during follow-up and those who do not. Methods: This retrospective study investigated the clinical outcomes of consecutive patients newly diagnosed with ApHCM between August 2011 and July 2014 who were followed-up for at least 3 years. The patients underwent 12-lead surface electrocardiography and/or 24-hour Holter electrocardiography at least once a year. The patients were divided into two groups, namely those who did or did not exhibit NVAF during follow-up, respectively. The baseline clinical and echocardiographic data of the two groups were compared. Results: Twenty patients were studied, five of whom were lost to follow-up. Of the remaining 15 ApHCM patients, seven developed NVAF. No differences were observed in the clinical characteristics of the two groups. However, for the echocardiographic data, the NVAF development group exhibited a larger LA volume and impaired LA reservoir, conduit and booster functions. The NVAF development group also showed lower peak LA strain and stiffer left atrium. The LA volume, function, global strain and stiffness were all statistically associated with NVAF development. Among these parameters, a LA conduit function of ≤ 24.9% was found to be the best parameter to discriminate NVAF development. Conclusions: The baseline LA function was impaired in the ApHCM patients who subsequently developed NVAF during follow-up. A LA conduit function of ≤ 24.9% was strongly associated with NVAF development.
Background: Paroxysmal supraventricular tachycardia (PSVT) is a common arrhythmia. However, its incidence and time course in pregnant women are unclear. This study was conducted to determine the incidence of PSVT in pregnant women by trimester. Methods: From 2001 to 2012, all pregnant women in Taiwan were monitored for PSVT events. Women who visited the emergency department or were admitted for symptomatic PSVT were enrolled in this study, and those with congenital heart diseases were excluded. Results: A total of 2,387,588 pregnancies (1,623,596 mothers) were analyzed. For the women with no previous history of a PSVT event, the incidence rates of symptomatic PSVT were 15, 33, and 60 per 100,000 pregnancies during the first, second, and third trimester, respectively. For the women with a previous history of PSVT, the incidence rates were 5625, 9525, and 11526 per 100,000 pregnancies, respectively. Most PSVT events occurred during the third trimester. Conclusions: In this Taiwanese cohort of pregnant women there was a stepwise increase in the incidence of symptomatic PSVT, which peaked during the third trimester. A past history of PSVT was associated with a higher risk of recurrence during pregnancy. We suggest that clinicians should be aware of this trend. Prompt management of PSVT events may prevent maternal and fetal complications.
Background: Non-vitamin K oral antagonist anticoagulants (NOACs) have been widely used in stroke prevention in atrial fibrillation (SPAF). The aim of this study was to compare the pharmacoeconomic impact of oral anticoagulants (OACs) including warfarin, dabigatran, rivaroxaban, apixaban, and edoxaban in SPAF in Taiwan. Methods: A decision tree, Markov model, and multiple sensitivity analyses were used to project the lifetime costs and quality-adjusted life years (QALYs) of OACs. Transitional probabilities were derived from a systematic review and network meta-analysis for Asian populations. Utilities and costs were obtained from published studies and the Taiwan National Health Insurance Research Database. Threshold of the willingness to pay (WTP) at USD 20,000 was applied to evaluate the results. Results: In base-case analysis, warfarin had the lowest cost at $13,363 ± 4,036, and edoxaban 60mg produced the most QALYs at 11.92 ± 1.98. The incremental cost-effectiveness ratios of dabigatran 150 and 110 mg, rivaroxaban 20 and 15 mg, apixaban 5 mg, and edoxaban 60 mg versus warfarin were $6,415, $4,225, $4,115 and $5,458 per QALY gained, respectively. Monte Carlo analysis revealed that dabigatran 150 and 110 mg, rivaroxaban 20 and 15 mg, apixaban 5 mg and edoxaban 60 mg were most cost-effective at 21.9%, 27.1%, 23.6%, and 27.4% of $20,000 compared to warfarin. Conclusions: From a Taiwan national payer perspective, all NOACs are cost-effective substitutes for warfarin in SPAF. However, the likelihood of cost-effective iterations for NOACs is highly driven by their market prices at the time and different WTP thresholds of policymakers.
Background: Few studies have investigated the effects of riociguat on pulmonary hemodynamics in Asian patients with chronic thromboembolic pulmonary hypertension (CTEPH). In this study, we evaluated the effects of riociguat on pulmonary hemodynamics in inoperable CTEPH patients. Methods: We retrospectively collected the clinical data of 11 inoperable CTEPH patients. Pulmonary hemodynamic parameters of right heart catheterization, echocardiography, 6-minute walk distance and World Health Organization (WHO) functional class were assessed at baseline and after riociguat treatment. Results: The median duration of riociguat treatment was 12 months, and all 11 patients tolerated riociguat 7.5 mg/day well after titration. With regards to pulmonary hemodynamic data, both mean pulmonary artery pressure and pulmonary vascular resistance significantly decreased from 41 ± 8 mmHg to 38 ± 9 mmHg (p = 0.045) and 787 ± 417 dyn.s.cm^(-5) to 478 ± 267 dyn.s.cm^(-5) (p = 0.007), respectively. With regards to clinical symptoms, WHO functional class significantly improved in nine of the 11 patients, and there was no change in the other two patients (p = 0.004). In addition, the median level of N-terminal pro-brain natriuretic peptide also significantly decreased from 281 (117-5943) pg/ml to 226 (48-1276) pg/ml (p = 0.021). Conclusions: Riociguat treatment improved both clinical symptoms and pulmonary hemodynamics in the inoperative CTEPH patients in this study.
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