Edward F. Philbin

CONFIRMATION OF A HEART FAILURE EPIDEMIC: FINDINGS FROM THE RESOURCE UTILIZATION AMONG CONGESTIVE HEART FAILURE (REACH) STUDY

OBJECTIVES The purpose of this study was to create an automated surveillance tool for reporting the incidence, prevalence and processes of care for patients with heart failure. BACKGROUND Previous epidemiologic studies suggest that the increasing prevalence of heart failure is a consequence of improved survival coupled with minimal changes in disease prevention. Developing new, efficient methods of assessing the incidence and prevalence of heart failure could allow continued surveillance of these rates during an era of rapidly changing treatments and health care delivery patterns. METHODS Using administrative data sets, we created a definition of heart failure using diagnosis codes. After adjustment for patients leaving our health system or death, we derived the incidence, prevalence and mortality of the population with heart failure from 1989 to 1999. RESULTS A total of 29,686 patients of all ages, 52.6% women and 47.4% men, met the definition of heart failure. Mean ages were 71.1 +/- 14.5 for women and 67.7 +/- 14.4 for men, p < 0.0001. Race proportions were 50.5% white, 44.6% African American and 4.9% other race. Incidence rates were higher in men and African Americans across all age groups. There was an annual increase in prevalence of 1/1,000 for women and 0.9/1,000 for men, p = 0.001 for both trends. CONCLUSIONS Through the feasible and valid use of automated data, we have confirmed a chronic disease epidemic of heart failure manifested primarily by an increase in prevalence over the past decade. Our surveillance system mirrors the results of epidemiologic studies and may be a valid method for monitoring the impact of prevention and treatment programs.

Socioeconomic status as an independent risk factor for hospital readmission for heart failure

The management of heart failure is characterized by high rates of hospital admission as well as rehospitalization after inpatient treatment of this disorder, whereas skillful medical care may reduce the risk of hospital admission. The purpose of this study was to examine the relation between income (as a measure of socioeconomic status) and the frequency of hospital readmission among a large and diverse group of persons treated for heart failure. We analyzed administrative discharge data from 236 nonfederal acute-care hospitals in New York State, involving 41,776 African-American or Caucasian hospital survivors with International Classification of Diseases, Ninth Revision, Clinical Modification codes for heart failure in the principal diagnosis position between January 1 and December 31, 1995. Household income was derived from postal ZIP codes and census data. We found that patients residing in lower income neighborhoods were more often women or African-Americans, had more comorbid illness, had higher use of Medicaid insurance, and were more often admitted to rural hospitals. There was a stepwise decrease in the crude frequency of readmission from the lowest quartile of income (23.2%) to the highest (20.0%) (p <0.0001 for Mantel-Haenszel chi-square test for trend across all quartiles; p <0.0001 for comparison between quartiles 1 and 4). After adjustment for baseline differences and process of care, income remained a significant predictor, with an increase in the risk of readmission noted in association with lower levels of income (adjusted odds ratio for quartile 1:4 comparison, 1.18; 95% confidence interval, 1.10 to 1.26, p <0.0001). We conclude that lower income patients hospitalized for treatment of heart failure in New York differ from higher income patients in important clinical and demographic comparisons. Even after adjustment for these fundamental differences and other potential confounding factors, lower income is a positive predictor of readmission risk.

Hospital Outcomes in Major Teaching, Minor Teaching, and Nonteaching Hospitals in New York State

PURPOSE The possible benefit that hospital teaching status may confer in the care of patients with cardiovascular disease is unknown. Our purpose was to determine the effect of hospital teaching status on in-hospital mortality, use of invasive procedures, length of stay, and charges in patients with myocardial infarction, heart failure, or stroke. SUBJECTS AND METHODS We analyzed a New York State hospital administrative database containing information on 388 964 consecutive patients who had been admitted with heart failure (n = 173 799), myocardial infarction (n = 121 209), or stroke (n = 93 956) from 1993 to 1995. We classified the 248 participating acute care hospitals by teaching status (major, minor, nonteaching). The primary outcomes were standardized in-hospital mortality ratios, defined as the ratio of observed to predicted mortality. RESULTS Standardized in-hospital mortality ratios were significantly lower in major teaching hospitals (0.976 for heart failure, 0.945 for myocardial infarction, 0.958 for stroke) than in nonteaching hospitals (1.01 for heart failure, 1.01 for myocardial infarction, 0.995 for stroke). Standardized in-hospital mortality ratios were significantly higher for patients with stroke (1.06) but not heart failure (1.0) or myocardial infarction (1.06) in minor teaching hospitals than in nonteaching hospitals. Compared with nonteaching hospitals, use of invasive cardiac procedures and adjusted hospital charges were significantly greater in major and minor teaching hospitals for all three conditions. The adjusted length of stay was also shorter for myocardial infarction in major teaching hospitals and longer for stroke in minor teaching hospitals. CONCLUSION Major teaching hospital status was an important determinant of outcomes in patients hospitalized with myocardial infarction, heart failure, or stroke in New York State.

Dilated Cardiomyopathy and Sensorineural Hearing Loss A Heritable Syndrome That Maps to 6q23–24

BACKGROUND Dilated cardiomyopathy (DCM) and sensorineural hearing loss (SNHL) are prevalent disorders that occur alone or as components of complex multisystem syndromes. Multiple genetic loci have been identified that, when mutated, cause DCM or SNHL. However, the isolated coinheritance of these phenotypes has not been previously recognized. METHODS AND RESULTS Clinical evaluations of 2 kindreds demonstrated autosomal-dominant transmission and age-related penetrance of both SNHL and DCM in the absence of other disorders. Moderate-to-severe hearing loss was evident by late adolescence, whereas ventricular dysfunction produced progressive congestive heart failure after the fourth decade. DNA samples from the larger kindred (29 individuals) were used to perform a genome-wide linkage study. Polymorphic loci on chromosome 6q23 to 24 were coinherited with the disease (maximum logarithm of odds score, 4.88 at locus D6S2411). The disease locus must lie within a 2.8 cM interval between loci D6S975 and D6S292, a location that overlaps an SNHL disease locus (DFNA10). However, DFNA10 does not cause cardiomyopathy. The epicardin gene, which encodes a transcription factor expressed in the myocardium and cochlea, was assessed as a candidate gene by nucleotide sequence analysis; no mutations were identified. CONCLUSIONS A syndrome of juvenile-onset SNHL and adult-onset DCM is caused by a mutation at 6q23 to 24 (locus designated CMD1J). Recognition of this cardioauditory disorder allows for the identification of young adults at risk for serious heart disease, thereby enabling early intervention. Definition of the molecular cause of this syndrome may provide new information about important cell physiology common to both the ear and heart.

The Heart Failure Clinic: A Consensus Statement of the Heart Failure Society of America

BACKGROUND Outpatient care accounts for a significant proportion of total heart failure (HF) expenditures. This observation, plus an expanding list of treatment options, has led to the development of the disease-specific HF clinic. METHODS AND RESULTS The goals of the HF clinic are to reduce mortality and rehospitalization rates and improve quality of life for patients with HF through individualized patient care. A variety of staffing configurations can serve to meet these goals. Successful HF clinics require an ongoing commitment of resources, the application of established clinical practice guidelines, an appropriate infrastructure, and a culture of quality assessment. CONCLUSIONS This consensus statement will identify the components of HF clinics, focusing on systems and procedures most likely to contribute to the consistent application of guidelines and, consequently, optimal patient care. The domains addressed are: disease management, functional assessment, quality of life assessment, medical therapy and drug evaluation, device evaluation, nutritional assessment, follow-up, advance planning, communication, provider education, and quality assessment.

The presence of African American race predicts improvement in coronary endothelial function after supplementary L-arginine☆

OBJECTIVES The purpose of our study was to determine if the presence of African American ethnicity modulates improvement in coronary vascular endothelial function after supplementary L-arginine. BACKGROUND Endothelial dysfunction is an early stage in the development of coronary atherosclerosis and has been implicated in the pathogenesis of hypertension and cardiomyopathy. Amelioration of endothelial dysfunction has been demonstrated in patients with established coronary atherosclerosis or with risk factors in response to infusion of L-arginine, the precursor of nitric oxide. Racial and gender patterns in L-arginine responsiveness have not, heretofore, been studied. METHODS Invasive testing of coronary artery and microvascular reactivity in response to graded intracoronary infusions of acetylcholine (ACh) +/- L-arginine was carried out in 33 matched pairs of African American and white subjects with no angiographic coronary artery disease. Pairs were matched for age, gender, indexed left ventricular mass, body mass index and low-density lipoprotein cholesterol. RESULTS In addition to the matching parameters, there were no significant differences in peak coronary blood flow (CBF) response to intracoronary adenosine or in the peak CBF response to ACh before L-arginine infusion. However, absolute percentile improvement in CBF response to ACh infusion after L-arginine, as compared with before, was significantly greater among African Americans as a group (45 +/- 10% vs. 4 +/- 6%, p = 0.0016) and after partitioning by gender. The mechanism of this increase was mediated through further reduction in coronary microvascular resistance. L-arginine infusion also resulted in greater epicardial dilator response after ACh among African Americans. CONCLUSIONS We conclude that intracoronary infusion of L-arginine provides significantly greater augmentation of endothelium-dependent vascular relaxation in those of African American ethnicity when compared with matched white subjects drawn from a cohort electively referred for coronary angiography. Our findings suggest that there are target populations in which supplementary L-arginine may be of therapeutic benefit in the amelioration of microvascular endothelial dysfunction. In view of the excess prevalence of cardiomyopathy among African Americans, pharmacologic correction of microcirculatory endothelial dysfunction in this group is an important area of further investigation and may ultimately prove to be clinically indicated.

Are there race/ethnicity differences in outpatient congestive heart failure management, hospital use, and mortality among an insured population?

Objective:The objective of this study was to assess the quality of outpatient care received by patients with congestive heart failure (CHF) and whether differences in care and outcomes exist by race/ethnicity. Background:Appropriate outpatient CHF management can improve patient well-being and reduce the need for costly inpatient care. Yet, little is known regarding outpatient CHF management or whether differences in this care exist by race/ethnicity. Methods:Using automated data sources, we identified a cohort of insured patients seen in an outpatient setting for CHF between September 1992 and August 1993. Medical record abstraction was used to confirm diagnosis of CHF. Patients (N = 566) were followed until September 1998. Race/ethnicity differences in outpatient management and medical care utilization were assessed using generalized estimating equations. Differences in mortality and hospitalization for CHF, controlling for patient characteristics and outpatient management, were assessed using Cox and Andersen-Gill models, respectively. Results:With the exception of beta blocker use and primary care visit frequency, few differences by race/ethnicity in patient characteristics and CHF management were found. However, older black patients had more hospital use both at baseline and during follow up. These differences persisted after adjusting for patient characteristics and clinical management. No race/ethnicity differences were found in mortality. Conclusions:In an insured population, older black patients with CHF have substantially more hospital use than older white patients. This increased use was not explained by differences in CHF outpatient management. Further research is needed to understand why race/ethnicity differences in hospital use are observed among older patients with CHF.

Subcutaneous Implantable Cardioverter Defibrillator for Dialysis Patients: A Strategy to Reduce Central Vein Stenoses and Infections

Central venous stenosis is a common complication of the transvenous leads associated with an implantable cardioverter defibrillator (ICD). Although epicardial leads have been reported to bypass this complication, their placement is much more invasive than the subcutaneous ICDs (SICDs) and requires the services of a cardiothoracic surgeon. Recent data have demonstrated successful defibrillation using an SICD. In this report, we present 4 long-term hemodialysis patients treated successfully with an SICD. 3 patients received the device for primary prevention of sudden cardiac death (cardiomyopathy with low ejection fraction). The patient in the fourth case had a prolonged QT interval and received the device for secondary prevention. 3 patients had an arteriovenous fistula, whereas 1 patient was dialyzing with a tunneled dialysis catheter. Insertion of an SICD is a minimally invasive procedure. By virtue of leaving the venous system untouched, this approach might offer the advantage of reduced risk of central venous stenosis and infection over an endocardial ICD with transvenous leads. SICD is not experimental; it has been approved by the US Food and Drug Administration and is currently being used in the United States and Europe.

Usefulness of clinical information to distinguish patients with normal from those with low ejection fractions in heart failure

In this study we used the DIG trial database to determine whether clinical variables used in combination could accurately predict left ventricular EF for individual patients with HF. The prediction model was able to identify within 0.05 (± 5 EF U) the correct numerical EF only 45% of the time. Although categorical analysis showed that nearly all of the 38% of patients who had the lowest predicted EF actually had EF ≤0.45, this method was unreliable for the remaining 62% of patients.

Improving outcomes in diastolic heart failure. Techniques to evaluate underlying causes and target therapy.

PREVIEW Abnormal diastolic function is a common cause of clinical heart failure, particularly among elderly patients. Through early diagnosis and careful management of diastolic dysfunction, these patients can expect improved functional capacity and, in some cases, a favorable long-term outcome. In this article, Drs Torosoff and Philbin discuss how to confirm the diagnosis of diastolic heart failure through objective testing. Current approaches to the treatment of symptoms, including reduction of intravascular volume, heart rate control, and elimination of precipitating factors, are also presented.