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Biomedical subjects

J L Vacek

Publications and source records attributed to J L Vacek.

At least 19 recordsLinked to original sources
PubMed2002

Consistency of echocardiographic ejection fraction: variation and 'drift' by interpreter and practice site.

AIMS: Visual analysis of ejection fraction by echocardiography (echo) is commonly performed, but little data exists regarding consistency among interpreters. We postulate that an active echo group evolves a standard to which interpreters cluster, with variation or 'drift' occurring at satellite sites distant from the main practice centre. Assuming that echo ejection fraction follows a normal distribution, average ejection fraction for high volume readers should be similar. METHODS AND RESULTS: From May 1997 to June 1999, 8187 echoes were read by 16 (average 512) readers of a single practice at several sites. Composite and individual ejection fraction (visual estimate) means and standard deviations were compared. Composite ejection fraction was 54.17+/-11.35. Mean ejection fraction varied significantly overall among readers (P<0.0001) with 37 comparisons between individual readers being significantly different (P<0.05). However, analysis suggested that these individual differences involved only five readers, four of whom practised at satellite sites. If these five readers were excluded, no significant individual differences were seen (n=6202). If only the four satellite readers were excluded, just four significant individual differences were seen (n=6915). CONCLUSIONS: (1) Within a busy single practice site, mean echo ejection fraction is very similar, suggesting a self-evolved practice standard that is consistently adhered to. (2) 'Drift' or variability is seen at smaller satellite sites, perhaps due to less exposure to the echo interpretations of others. (3) This type of analysis may provide a useful quality assurance tool for echo laboratories.

Cardiology↗
PubMed2001

Digital echocardiography: its role in modern medical practice.

Digital echocardiography has evolved rapidly during the last decade, and the all-digital echocardiographic laboratory has just reached the threshold of reality. This review article explains what this transition means for the modern medical practice and concisely presents what a digital echocardiogram is, the technical aspects of digital image acquisition and processing, and the advantages and limitations of digital echocardiography vs analog echocardiography. This review should serve as a useful source of information for the general cardiologist not working closely with digital echocardiography, as well as a resource for the noncardiologist.

Echocardiography↗
PubMed2000

Incidence of factor V Leiden in patients with acute myocardial infarction.

The genetic defect of coagulation factor V known as factor V Leiden produces a resistance to degradation by activated protein C (APC) and increases the risk of venous thromboembolism. The data on arterial thrombosis associated with APC resistance are still not clearly defined. We conducted a study in patients presenting with acute myocardial infarction (MI) to assess whether factor V Leiden increases the risk of arterial thrombosis. We studied 109 patients who had a diagnosis of acute MI (69 males and 40 females, aged 25-91 years), and 112 controls. The study population was identified by characteristic ECG changes and elevation of serum CK-MB, whereas the control subjects were anonymous healthy blood donors with no known history of coronary artery disease. Blood samples from the patients and controls were analyzed for the factor V Leiden mutation by DNA analysis, using the polymerase chain reaction. Heterozygous factor V Leiden mutation was found in 9 of 109 (8%) MI patients and 5 of 112 (4%) control subjects (P =.42). In conclusion, this study shows no evidence of an association between factor V Leiden and acute MI.

Activated Protein C Resistance↗
PubMed2000

Transition to an all-digital echocardiography laboratory: a large, multi-site private cardiology practice experience.

Acquisition, interpretation, and storage of digital echocardiographic images has many advantages over the standard videotape-based method. Archival, transmission, and comparative interpretation are all optimized with digital echocardiography. A study performed at one site can be immediately available for viewing and analysis at another site by means of standard data transfer technology. Echocardiograms can be interpreted in the context of prior studies, which are readily available for side-by-side comparison. The transition to an all-digital laboratory involves the commitment of persons at multiple levels in the cardiology practice, including administrators, information technology specialists, sonographers, and physicians. Quality of patient care, use of physicians' and sonographers' time, and long-term financial benefit are all areas where improvement may be realized with the use of digital echocardiography. We present our experience in the development of an all-digital echocardiography laboratory, and we conclude that digital echo-cardiography is practical and can be implemented readily in a clinical setting. We performed several correlative analyses during this transition to validate the consistency and accuracy of digital interpretation compared with those of analog methods. The transition process from analog (videotape) to digital, including full wide area network exchange, took approximately 8 months. As technology advances, issues surrounding storage, comparison, and acquisition formats will continue to develop. We hope that our experience will help others make the transition to the digital environment and benefit from the ease of image access, the ability to comparatively interpret echocardiograms, and the superior image quality afforded by this advancement.

Attitude of Health Personnel↗
PubMed2000

Coronary angioplasty in black and white patients: demographic characteristics and outcomes.

BACKGROUND: Percutaneous transluminal coronary angioplasty (PTCA) is an effective means of revascularization, but differences may exist in application and outcomes for patient subgroups. Few data compare PTCA in black and white patients. METHODS: We compared patient characteristics and outcomes of PTCA in 3,447 white patients and 52 black patients. RESULTS: Comparing baseline characteristics, more black patients were hypertensive (87% vs 57%) or diabetic (38% vs 22%). Procedural success was similar, and in-hospital complications were infrequent in both groups. Over a mean follow-up of 115 weeks, no significant difference occurred between the two groups in nonfatal MI, repeat PTCA, coronary artery bypass grafting, or death. Event-free survival was lower in blacks than in whites. CONCLUSIONS: At our center, black patients have success rates, in-hospital outcomes, and long-term survival after PTCA similar to those of white patients, though event-free survival was lower in blacks.

Adult↗
PubMed1999

Isolated left anterior descending coronary artery disease: percutaneous transluminal coronary angioplasty versus stenting versus left internal mammary artery bypass grafting.

BACKGROUND: Single-vessel coronary artery disease is usually treated with PTCA; however, this approach when applied to the left anterior descending coronary artery (LAD) is hampered by high restenosis rates, often approaching 50%. Coronary stenting (STENT) and left internal mammary artery bypass grafting of the LAD (LIMA-LAD) are other options that have been successfully used for single-vessel LAD disease. The optimal mode of revascularization for patients with isolated single-vessel LAD disease is unclear. The purpose of the present study was to examine PTCA versus STENT versus LIMA-LAD with respect to short- and intermediate-term outcomes. METHODS AND RESULTS: This was an observational retrospective cohort study comparing in-hospital and intermediate-term outcomes and functional class among patients with isolated single-vessel LAD disease revascularization. Consecutive eligible patients were grouped according to their initial revascularization procedure and systematically followed up. A total of 704 patients qualified for the study: 469 in the PTCA group, 137 in the STENT group, and 98 in the LIMA-LAD group. Follow-up data were complete for 97% of patients and averaged 27+/-13 months. In-hospital mortality for the PTCA, STENT, and LIMA-LAD groups was 1.1%, 0%, and 0% (P=0.51), respectively. Median hospital stays after the procedure for the respective treatment groups were 1, 1, and 5 days (P<0.001), and occurrences of in-hospital myocardial infarction were 0.9%, 1.5%, and 1.0% (P=NS). Repeat revascularization procedures were performed in 30%, 24%, and 5% of the PTCA, STENT, and LIMA-LAD groups (P=<0. 001 for LIMA-LAD versus other groups, P=0.11 for PTCA versus STENT). Actuarial 2-year mortality was 3.9%, 2.6%, and 1% in the PTCA, STENT, and LIMA-LAD groups (P=0.33). CONCLUSIONS: Revascularization for isolated LAD disease using PTCA, STENT, or LIMA-LAD results in low in-hospital adverse event rates and good long-term results. Repeat procedures are required less often after LIMA-LAD than after either PTCA or STENT. Long-term mortality was not statistically different, but the trend was for the lowest mortality with LIMA-LAD, a somewhat higher mortality with STENT, and the highest mortality with PTCA.

Aged↗
PubMed1999

A randomized, controlled trial of the effects of remote, intercessory prayer on outcomes in patients admitted to the coronary care unit.

CONTEXT: Intercessory prayer (praying for others) has been a common response to sickness for millennia, but it has received little scientific attention. The positive findings of a previous controlled trial of intercessory prayer have yet to be replicated. OBJECTIVE: To determine whether remote, intercessory prayer for hospitalized, cardiac patients will reduce overall adverse events and length of stay. DESIGN: Randomized, controlled, double-blind, prospective, parallel-group trial. SETTING: Private, university-associated hospital. PATIENTS: Nine hundred ninety consecutive patients who were newly admitted to the coronary care unit (CCU). INTERVENTION: At the time of admission, patients were randomized to receive remote, intercessory prayer (prayer group) or not (usual care group). The first names of patients in the prayer group were given to a team of outside intercessors who prayed for them daily for 4 weeks. Patients were unaware that they were being prayed for, and the intercessors did not know and never met the patients. MAIN OUTCOME MEASURES: The medical course from CCU admission to hospital discharge was summarized in a CCU course score derived from blinded, retrospective chart review. RESULTS: Compared with the usual care group (n = 524), the prayer group (n = 466) had lower mean +/- SEM weighted (6.35 +/- 0.26 vs 7.13 +/- 0.27; P=.04) and unweighted (2.7 +/- 0.1 vs 3.0 +/- 0.1; P=.04) CCU course scores. Lengths of CCU and hospital stays were not different. CONCLUSIONS: Remote, intercessory prayer was associated with lower CCU course scores. This result suggests that prayer may be an effective adjunct to standard medical care.

Aged↗
PubMed1999

Use of intravenous adenosine as a noninvasive diagnostic test for sick sinus syndrome.

BACKGROUND: Testing for sick sinus syndrome (SSS) requires invasive stimulation protocols for sinus node recovery time (SNRT) and corrected sinus node recovery time (CSNRT). METHODS AND RESULTS: We compared the CSNRT with the lengthening of the sinus cycle length (ADO:SCL) corrected to the basic cycle length (ADO:CSNRT) after administration of an intravenous bolus of adenosine (0.15 mg/kg) in 10 patients with clinical SSS (group 1) and 67 control patients (group 2). With 550 ms as an abnormal result for the ADO:CSNRT (and for the CSNRT) as an indicator of sinus node dysfunction, the ADO:CSNRT had a sensitivity of 80% and specificity of 97% for detection of SSS compared with sensitivity and specificity of 70% and 95% for invasive CSNRT. When combined, the 2 tests had a sensitivity of 100%. There was significant difference in the CSNRT between group 1 (1848 +/- 1825 ms) and group 2 (355 +/- 169 ms, P <. 0001) and a significant difference in ADO:CSNRT between group 1 (1168 +/- 1002 ms) and group 2 (272 +/- 592 ms, P <.0001). CONCLUSIONS: We conclude that the ADO:CSNRT is a sensitive and specific test for SSS that equals invasive testing and should be considered as an alternative to invasive testing in patients with suspected SSS.

Adenosine↗
PubMed1999

Noninvasive approaches to peripheral vascular disease. What's new in evaluation and treatment?

Current availability of noninvasive evaluation and treatment methods for peripheral vascular disease is unprecedented. Understanding of vascular and molecular biology, physiology, and pathology has improved significantly, as have the technologic capabilities of ultrasonography, digital imaging, therapeutic angiogenesis, and other methods not even in existence a few decades ago. However, although science continues to advance rapidly on multiple fronts and, eventually, noninvasive methods will supersede current treatment options, for the immediate future, heavy emphasis should continue to be on preventive strategies.

Genetic Therapy↗
PubMed1999

Catheter-based methods for managing peripheral vascular disease. Which types of occlusive disease are most amenable?

Primary care physicians have an important role in identification and referral of patients with signs and symptoms of peripheral vascular disease. Advances in technology have increased the effectiveness of percutaneous catheter-based techniques used to treat stenosis or occlusion in various anatomic sites. However, early evaluation remains an important factor in the success of treatment. In this symposium article, Drs Lips and Vacek review the current catheter-based techniques for managing various types of occlusive disease and include numerous angiographic illustrations from their case files. They also examine the factors affecting choice of treatment approach and briefly discuss the role of thrombolytic therapy.

Angiography↗
PubMed1999

Gender-related risk factors and outcomes for non-Q wave myocardial infarction patients receiving in-hospital PTCA.

BACKGROUND: We analyzed the risk factors and outcomes associated with non-Q wave myocardial infarction (MI) in females and males. We studied 376 consecutive patients N 275 males (73%) and 101 females (27%) N who presented with non-Q wave MI and had percutaneous transluminal coronary angioplasty (PTCA) prior to discharge during the period between January 1992 and February 1996. RESULTS: Females were significantly older (68 +/- 10 years vs. 61 +/- 11 years; p < 0.001) and had more hypertension (67% vs. 51%; p < 0.01). Males had a slightly lower ejection fraction (47 +/- 11%) compared to females (50 +/- 10%; p < 0.001). Angioplasty was equally successful for women and men (96% vs. 97%; p = NS) with a statistically significant smaller number of lesions dilated per patient in females (1.38 vs. 1.51; p < 0.04). There were no significant differences in unstable angina, prior coronary artery bypass graft (CABG) surgery, saphenous vein graft PTCA, single vessel versus multiple vessel disease or history of prior MI. In-hospital complications (i.e., the need for CABG or repeat PTCA, recurrent MI, and stroke) were not statistically significant for either females or males. There was a trend for a higher in-hospital death rate in females after a non-Q wave MI, but it was not statistically significant (4% vs. 1%; p = 0.058). However, at one-year follow-up females had a significantly worse survival rate than men (89% vs. 95%; p < 0.04), although event-free survival rate was similar (61% female, 66% male; p = NS). CABG was performed less commonly in women by the end of one year (p < 0.02) than in men, while the performance of PTCA was similar. CONCLUSIONS: Although women with non-Q wave MI presented with more risk factors than men, in-hospital revascularization was equally successful with few complications and morbid events and similar event-free outcome at one year. However, one year mortality was worse for women, suggesting a need for more aggressive follow-up evaluation and treatment. For both women and men, this aggressive percutaneous revascularization strategy resulted in much better outcome than previously reported for medical treatment of non-Q wave MI.

Aged↗
PubMed1998

One-year outcomes of diabetic versus nondiabetic patients with non-Q-wave acute myocardial infarction treated with percutaneous transluminal coronary angioplasty.

Risk factors and outcomes associated with non-Q-wave myocardial infarction (MI) in diabetics and nondiabetics were analyzed for 376 consecutive patients, 77 with diabetes (20%) and 299 nondiabetics (80%), who had non-Q-wave MI and had percutaneous transluminal coronary angioplasty (PTCA) performed before discharge from hospital during the period from January 1992 to February 1996. Diabetics were slightly older (64 +/- 10 years vs 61 +/- 12 years, p <0.053), had more prior coronary artery bypass grafting (CABG) surgery (27% vs 12%, p <0.001), and hypertension (77% vs 49%, p <0.001). There was no significant difference in unstable angina, saphenous vein graft PTCA, single versus multiple vessel disease, or history of MI. PTCA success rates for diabetics versus nondiabetics were similar (96% vs 97%, p = NS). In-hospital complications such CABG, recurrent MI, repeat PTCA, stroke, and death were not statistically significant between the 2 groups. At 1-year follow-up, survival in diabetics (92%) was similar to nondiabetics (94%, p = NS), although event-free survival (PTCA, CABG, MI, death) was worse in diabetics (55% vs 67% for nondiabetics, p <0.05). Although diabetic patients with non-Q-wave MI represent a cohort with more risk factors for poor outcome, aggressive in-hospital revascularization with PTCA results in an excellent short-term outcome as well as 1-year survival similar to the nondiabetic patients. However, total events at 1-year follow-up are more common in the diabetic patients, suggesting that more aggressive screening and therapy in follow-up may be warranted, and that a diabetic with non-Q-wave MI will require increased utilization of cardiovascular resources in the first year after the event.

Aged↗
PubMed1996

Use of exercise echocardiography to evaluate patients after coronary angioplasty.

Exercise echocardiography is a sensitive, specific, and highly accurate method for detecting coronary restenosis and progressive compromise of untreated arterial segments in patients who have undergone percutaneous transluminal coronary angioplasty. It is far more reliable in predicting the status of the coronary anatomy in such patients than exercise electrocardiography or symptomatic status.

Adult↗
PubMed1996

"Kissing balloon" technique in percutaneous transluminal coronary angiography: single-guide catheter, dual-wire, dual-balloon system with single inflation device.

This is a report of a new modification of the "kissing balloon" technique for complex multivessel angioplasty. Based on a series of five consecutive cases, we describe a representative case in which a single guide catheter and two over-the-wire balloon catheters were utilized in association with a single inflation device. This approach could have significant advantages over the two-inflation-device approach, based primarily on its lower cost without compromise of the effectiveness and safety of the technique.

Angioplasty, Balloon, Coronary↗
PubMed1995

Gender-related differences in reperfusion treatment allocation and outcome for acute myocardial infarction.

Gender-related differences in outcome after myocardial infarction may relate to biased treatment allocation. To address this concern we analyzed 573 patients presenting with ST-segment elevation acute myocardial infarction (AMI), and treated within 6 hours with reperfusion therapy. Two-hundred eighty patients (49%) received direct coronary angioplasty, whereas 293 (51%) received thrombolytics followed by angioplasty (p = NS). Seventy-four percent were men and 26% were women (p = NS for differences in sex distribution between the 2 treatment groups). Women were older in both groups (p < 0.01). Inferior AMI was seen more often in women (64% of direct angioplasty, 71% of lytic first) than in men (51% and 59%, respectively; p < 0.03). There was no gender-related differences in presence of multivessel coronary artery disease, prior AMI, prior bypass surgery, baseline ejection fraction, percentage of patients with ejection fraction < or = 40%, number of narrowings dilated, or angioplasty success. Patients who underwent direct angioplasty had more multivessel disease (p < 0.001) and prior coronary artery bypass surgery (p = 0.002). After a mean follow-up of 129 +/- 113 weeks, no gender-related differences were seen in the need for cardiac catheterization, documented restenosis, AMI, coronary artery bypass surgery, clinical ischemia, or death. Patients treated with direct angioplasty were more likely to undergo coronary artery bypass surgery (p < 0.05) or to die (p < 0.01). Thus, women undergoing reperfusion therapy for ST-segment elevation were older than men, with a higher frequency of inferior wall AMI. No specific gender-related bias in treatment allocation was evident.

Aged↗
PubMed1995

Comparison of lovastatin (20 mg) and nicotinic acid (1.2 g) with either drug alone for type II hyperlipoproteinemia.

Our study indicates that the combination of nicotinic acid (1.2 g/day) and lovastatin (20 mg/day) is more effective than either drug alone in reducing total and LDL cholesterol. Although HDL cholesterol was not significantly improved by these doses of agents over the duration of this study, LDL/HDL and HDL/total cholesterol ratios were improved due to the beneficial actions on total and LDL cholesterol. No serious side effects or changes in serum chemistries were observed, and the combination was well tolerated.

Aged↗