[The efficiency of cutting balloon angioplasty in the treatment of in-stent restenosis]

OBJECTIVE

Although stents reduce the restenosis rate, stent restenosis continues to be a major problem and the optimal treatment of stent restenosis is still controversial. In this study, we aimed to investigate the angiographic recurrent stent restenosis rate at 6-12 months after successful cutting balloon angioplasty (CBA) for the bare metal stent restenosis.

METHODS

Thirty patients (mean age: 57.9 ± 11.6, 22 males) undergoing successful CBA for the treatment of in-stent restenosis at our hospital were prospectively included in this study. Control coronary angiography was performed at 6-12 months after CBA. Lesion length, minimal lumen diameter (MLD), and reference vessel diameter were analyzed by computerized digital angiographic analysis. Recurrent restenosis was defined as the lesions obstructing the lumen more than 50%. We described the lesions shorter than 10 mm as to be focal and those longer than 10 mm as to be diffuse. We used Student t, Chi-square, and Mann-Whitney U tests for statistical analysis.

RESULTS

Two patients had two distinct lesions; therefore, 32 lesions were assessed. There were 9 (28.1%) recurrent restenosis on the control coronary angiography. Recurrent restenosis developed in 3/21 (14.3%) of focal type lesions and 6/11(54.5%) of diffuse type lesions (p=0.035). Pre-procedural MLD was lower in the restenotic group compared to non-restenotic group (0.41 ± 0.29 vs. 0.64 ± 0.17 mm, p=0.048) while percent of stenosis was higher in the restenotic group (76.8 ± 12 vs. 69.6 ± 5.37%, p=0.029).

CONCLUSION

In the selected patients, CBA is an effective and a safe method for the treatment of bare metal stent restenosis. CBA might be considered as a first-line treatment method in patients with focal type lesions.

[Percutaneous coronary interventions in patients with acute myocardial infarction after unsuccessful thrombolysis]

In 176 patients with acute myocardial infarction admitted to N.V. Sklifosofsky institute of urgent aid in 2003-20007 we compared efficacy of 3 strategies of treatment after unsuccessful thrombolytic therapy (TLT): percutaneous coronary intervention (PCI) during first 24 hours (n = 30), PCI on days 2 or 3 (n = 38); conservative treatment (n = 108). The data obtained show that it is expedient to consider absence of 50% reduction of STAsegment elevations in 90 min after start of TLT as indication to urgent late PCI when possibilities for immediate intervention after unsuccessful thrombolysis are lacking. Alternative reperfusion is the only type of effective treatment of patients with failed pharmacological reperfusion. Necessity to perform PCI during first 12 hours after unsuccessful TLT does not exclude possibility of its later fulfillment in acute period of myocardial infarction. Efficacy of the latter is comparable with success rate of rescue PCI. The use of both invasive strategies has allowed to lessen rate of complications and prevent lethal outcomes. Success of late urgent interventions in acute period of infarction after failed thrombolysis opens possibilities for their active use in patients transferred from other hospitals.

Quality measure study: progress in reducing the door-to-balloon time in patients with ST-segment elevation myocardial infarction

BACKGROUND

Reperfusion therapy improves both mortality and morbidity in patients with ST-elevation myocardial infarction (STEMI). Timeliness of such reperfusion is an important factor in improving patient survival. For percutaneous coronary intervention (PCI), the American College of Cardiology has recommended a goal of <90 minutes from initial hospital contact to first balloon inflation.

METHODS

The authors retrospectively reviewed 131 patients with a diagnosis of STEMI seen at a PCI capable hospital between January, 2006 and September, 2008, a period of time before and after implementation of a protocol aimed at reducing door-to-balloon time. Sixty-one percent of study population was Asian or Pacific Islander. This protocol was largely based on the identification by Bradley et al. of factors whose modification could shorten this time interval.

RESULTS

Time to reperfusion was compared between groups before (n=57), and after (n=58) protocol implementation. Median door-to-balloon time for the former group was 133 minutes, interquartile range (IQRs), (25th, 75th percentile; 104.5, 147), and for the latter group 67 minutes, IQRs (56, 80) respectively (p<0.001). Prior to implementation of the protocol, a door-to-balloon time of <90 minutes was achieved in 17% of cases. By the third quarter of 2008, this goal was being met in 100%.

CONCLUSION

This observational study provides support for the use of the strategies described as a key for reduction in door-to-balloon time.

The relationship between the emergent primary percutaneous coronary intervention quality measure and inpatient myocardial infarction mortality

BACKGROUND

In the setting of acute ST-segment elevation myocardial infarction (STEMI), reperfusion therapy with emergent primary percutaneous coronary intervention (PCI) significantly reduces mortality. It is unknown whether a hospital's performance on the Centers for Medicare & Medicaid Services (CMS) quality metric for time from patient arrival to angioplasty is associated with its overall hospital acute myocardial infarction (AMI) mortality rate.

OBJECTIVES

The objective of this study was to evaluate if hospitals with higher performance on the time-to-PCI quality measure are more likely to achieve lower mortality for patients admitted for any type of AMI.

METHODS

Using merged 2006 data from the Nationwide Inpatient Sample (NIS), the American Hospital Association (AHA) annual survey, and CMS Hospital Compare quality indicator data, we examined 69,101 admissions with an International Classification of Diseases, Ninth Revision (ICD-9)-coded principal diagnosis of AMI in the 116 hospitals that reported more than 24 emergent primary PCI admissions in that year. Hospitals were categorized into quartiles according to percentage of admissions in 2006 that achieved the primary PCI timeliness threshold (time-to-PCI quality measure). Using a random effects logistic regression model of inpatient mortality, we examined the significance of the hospital time-to-PCI quality measure after adjustment for other hospital and individual patient sociodemographic and clinical characteristics.

RESULTS

The unadjusted inpatient AMI mortality rate at the 27 top quartile hospitals was 4.3%, compared to 5.1% at the 32 bottom quartile (worst performing) hospitals. The risk-adjusted odds ratio (OR) of inpatient death was 0.83 (95% confidence interval [CI] = 0.72 to 0.95), or 17% lower odds of inpatient death, among patients admitted to hospitals in the top quartile for the time-to-PCI quality measure compared to the case if the hospitals were in the bottom 25th percentile.

CONCLUSIONS

Hospitals with the highest and second highest quartiles of time-to-PCI quality measure had a significantly lower overall AMI mortality rate than the lowest quartile hospitals. Despite the fact that a minority of all patients with AMI get an emergent primary PCI, hospitals that perform this more efficiently also had a significantly lower mortality rate for all their patients admitted with AMI. The time-to-PCI quality measure in 2006 was a potentially important proxy measure for overall AMI quality of care.

[Short and long-term results of endovascular treatment of bifurcational coronary stenosis]

Short and long-term results of endovascular treatment of true bifurcational coronary stenosis were analyzed in 229 patients. 68 patients received a "provisional-T" stenting on the first stage of the study. On the next stage 40 patients received the same "provisional-T" stenting, a total bifurcational stenting was conducted in 37 patients. Only coated stents were used. Independent risk factors of "provisional-T" stenting conversion to total bifurcational stenting were revealed. There were no differences between "provisional-T" and total bifurcational stenting considering the short-term treatment results. Long-term results (12-18 months) were analyzed in 70 patients. There were no restenosis of the main artery, whereas restenosis of the lateral branch was noticed in 5.5 and 2.94%, respectively, in the groups of "provisional-T" and total bifurcational stenting. Late thrombosis was registered in 1 case from the group of total bifurcational stenting.

Association of hospital primary angioplasty volume in ST-segment elevation myocardial infarction with quality and outcomes

CONTEXT

Earlier studies indicate an inverse relationship between hospital volume and mortality after primary angioplasty for patients presenting with ST-segment elevation myocardial infarction (STEMI). However, contemporary data are lacking.

OBJECTIVE

To assess the relationship between hospital primary angioplasty volume and outcomes and quality of care measures in patients presenting with STEMI.

DESIGN, SETTING, AND PATIENTS

An observational analysis of data on 29,513 patients presenting with STEMI and undergoing primary angioplasty in the American Heart Association's Get With the Guidelines registry. Patients were treated between July 5, 2001, and December 31, 2007, at 166 angioplasty-capable hospitals across the United States. Hospitals were divided into tertiles (<36 procedures per year, 36-70 procedures per year, and >70 procedures per year) based on their annual primary angioplasty volume.

MAIN OUTCOME MEASURES

Door-to-balloon (DTB) times, length of hospital stay, adherence with evidence-based quality of care measures, and in-hospital mortality.

RESULTS

Compared with low- and medium-volume centers, high-volume centers had better median DTB times (98 vs 90 vs 88 minutes, respectively; P for trend < .001). High-volume centers were more likely than low-volume centers to follow evidence-based guidelines at discharge. Length of stay was similar between the 3 groups (P for trend = .13). There was no significant difference in the crude mortality between the tertiles of volume (incidence rate, 3.9% vs 3.2% vs 3.0% for low-, medium-, and high-volume centers, respectively; P = .26 and P = .99 for low- and medium- vs high-volume hospitals, respectively). Sequential multivariable modeling using generalized estimating equations revealed no significant association between hospital primary angioplasty volume and in-hospital mortality (adjusted odds ratio [OR], 1.22; 95% confidence interval [CI], 0.78-1.91; P = .38 and adjusted OR, 1.14; 95% CI, 0.78-1.66; P = .49 for low- and medium- vs high-volume hospitals, respectively).

CONCLUSION

In a contemporary registry of patients with STEMI, higher-volume primary angioplasty centers vs lower-volume centers were associated with shorter DTB times and more use of evidence-based therapies, but not with adjusted in-hospital mortality or length of hospital stay.

Novel design of drug delivery in stented arteries: a numerical comparative study

Implantation of drug eluting stents following percutaneous transluminal angioplasty has revealed a well established technique for treating occlusions caused by the atherosclerotic plaque. However, due to the risk of vascular re-occlusion, other alternative therapeutic strategies of drug delivery are currently being investigated. Polymeric endoluminal pave stenting is an emerging technology for preventing blood erosion and for optimizing drug release. The classical and novel methodologies are compared through a mathematical model able to predict the evolution of the drug concentration in a cross-section of the wall. Though limited to an idealized configuration, the present model is shown to catch most of the relevant aspects of the drug dynamics in a delivery system. Results of numerical simulations shows that a bi-layer gel paved stenting guarantees a uniform drug elution and a prolonged perfusion of the tissues, and remains a promising and effective technique in drug delivery.

[Transportation of two patients with acute myocardial infarction for primary percutaneous coronary intervention by a helicopter ambulance]

Air ambulance system has been established throughout the country by the Ministry of Health of Turkey. Fifteen provinces are determined as centers of the system so that all the country is covered within at the most one-hour flight distance. As part of this nationwide system, two helicopter ambulances have been deployed in our hospital since October 2008. Prompt use of reperfusion therapy improves survival of patients sustaining acute myocardial infarction (AMI). Two components of delay from the onset of AMI to reperfusion therapy are prehospital and interhospital transportations. We presented the first two cases of AMI whose transfers were made by a helicopter ambulance for primary percutaneous coronary intervention. One patient (age 58 years, male) presented to a state hospital 47 km away from Ankara about an hour after the onset of chest pain. Time to reach the patient by a helicopter ambulance was 28 minutes and transfer to our center was 14 minutes. The other patient (age 76 years, male) was admitted within 15 minutes of the onset of chest pain to a state hospital 58 km away from Ankara. Reaching the patient by a helicopter ambulance and transferring him to our center took 30 minutes and 16 minutes, respectively. Door-to-balloon times were 16 minutes and 18 minutes, respectively. Infarct-related coronary artery patency was achieved in both cases.

Different treatment options in chronic coronary artery disease: when is it the time for medical treatment, percutaneous coronary intervention or aortocoronary bypass surgery?

BACKGROUND

3% to 4% of the population suffers from chronic coronary artery disease (CAD). Primary care physicians, internists, cardiologists, and cardiac surgeons are involved in their long-term care. This article presents a complementary care pathway that integrates two apparently competing treatment options, aortocoronary bypass surgery (ACB) and percutaneous coronary intervention (PCI). Together with lifestyle changes and medical therapy, these treatments reduce morbidity and mortality and improve quality of life.

METHODS

This article was written by cardiac surgeons and cardiologists on the basis of the current treatment guidelines for coronary artery disease, a selective review of the literature (randomized, controlled trials and registry data), and a process of interdisciplinary consensus building.

RESULTS AND CONCLUSIONS

Lifestyle changes can reduce cardiovascular risk factors, improve quality of life, and lower cardiovascular morbidity and mortality. They provide additional benefit over and above medical therapy and/or revascularization procedures and should be strongly recommended to all patients. Revascularization is not indicated for patients who are asymptomatic on medical therapy or who have only a small area of myocardial ischemia. With either PCI or ACB, the symptoms of angina pectoris can be markedly improved, or even eliminated. Both of these revascularization procedures should be accompanied by optimized medical treatment. Revascularization is indicated when the area of myocardial ischemia is large, whether or not symptomatic angina is present. ACB is the treatment of choice for 3-vessel disease and/or left main stenosis. For all other constellations of coronary findings, ACB and PCI are equally good therapeutic options. The treating physician should take the patient's expectations into account and present the short- and long-term benefits and drawbacks of each proposed treatment to the patient so that an informed decision can be made.

An emergency physician activated protocol, 'Code STEMI' reduces door-to-balloon time and length of stay of patients presenting with ST-segment elevation myocardial infarction

INTRODUCTION

National consensus guidelines recommend that ST-segment elevation myocardial infarction (STEMI) patients achieve a door-to-balloon time of < 90 min. We sought to determine if emergency physician initiated simultaneous activation of the cardiac catheterisation laboratory team and the on-call interventional cardiologist has any impact on reducing door-to-balloon-times at our hospital.

METHODS

A total of 72 consecutive STEMI patients were evaluated from January 2007 to December 2007. The emergency physician activated Code STEMI required concurrent activation of cardiac catheterisation personnel and the on-call interventional cardiologist by the emergency physician. These patients were compared with our staff cardiologist activated primary angioplasty protocol from January 2006 to December 2006 for 51 consecutive STEMI patients. The primary outcome was to measure median door-to-balloon time between both groups. Secondary end-points included the individual components of door-to-balloon times (i.e. door-to-ECG time), peak troponin-I level within 24 h, length of stay and all-cause in-hospital mortality.

RESULTS

Median door-to-balloon time decreased overall (112 vs. 74 min, p < 0.001). Of the three components of door-to-balloon time analysed, the ECG to cardiac catheterization laboratory time exhibited the largest area of improvement with 16 min absolute reduction in median door-to-balloon time. Median peak troponin levels (50 vs. 25 ng/ml, p < 0.001), and hospital length of stay (4 vs. 3 days, p < 0.01) decreased. We did not see any statistically significant difference in all-cause in-hospital mortality (p = 0.6).

CONCLUSIONS

Emergency physician activation of the Code STEMI significantly reduces door-to-balloon time to within national standards of care, and length of stay in STEMI patients.

Individual quality improvement in acute coronary syndromes: a performance improvement initiative

Although treatment guidelines from the American College of Cardiology (ACC) and the American Heart Association (AHA) have been published and widely accepted, barriers to the optimal management of patients with acute coronary syndromes (ACS) still exist. Adherence to guidelines has been correlated with improvements in patient outcomes in ACS, including reduced mortality, yet data demonstrate that 25% of opportunities to provide guideline-recommended care are missed. This article describes a performance improvement (PI) initiative designed to address gaps in process-related ACS care and improve patient outcomes. PI is an American Medical Association-approved, standardized continuing medical education format in which physicians can earn up to 20 American Medical Association PRA category 1 credits by completing 2 phases of self-assessment and developing and implementing a PI plan to address self-identified areas in which patient care can be improved. In this ACS PI initiative, physicians will assess their practice using performance measures defined by the 2007 ACC/AHA ST-segment elevation myocardial infarction and unstable angina or non-ST-segment elevation myocardial infarction guideline updates within 3 general benchmark areas: (1) patient risk assessment, (2) initial pharmacologic management, and (3) time-to-treatment (ie, "door-to-needle," "door-to-balloon," and "door-in-door-out" times). After completing a self-assessment and identifying 1 or more areas of improvement, participants can complete educational interventions and access benchmark-specific tools that provide guidance on improving adherence with the ACC/AHA guidelines. This PI initiative supplements other ongoing quality improvement initiatives in ACS, but is unique in that it is the first to use individual physician self-assessment, benchmark-focused continuing medical education, and self-developed PI plans to improve process-related ACS care.

On acquiring decision making skills for endovascular interventions

To improve interventional training we propose a staged rational approach for decision making and skill acquisition. Education and training for endovascular interventions should start to develop the learners' decision-making skills by learning from explicit representations of master interventionist's tacit decision-making knowledge through implementation of the notions of generic interventional modules, interventional strategic and tactical designs. We hope that these suggestions will encourage action, stimulate dialogue and advance the precision of our learning, procedures, practice and patient care.