Clinical trial NCT00024505: Multidisciplinary Study of Right Ventricular Dysplasia
Official title: Multidisciplinary Study of Right Ventricular Dysplasia
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Heart Diseases
Arrhythmogenic Right Ventricular Dysplasia
Lead sponsor: University of Arizona
Sponsor class: OTHER
Collaborators: name: National Heart, Lung, and Blood Institute (NHLBI)
First posted: 2001-09-18
Enrollment: 320
Sex: ALL
Minimum age (years): 12
Maximum age (years): 90
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Referals to enrolling centers from communities

Brief summary: The purpose of this study is to investigate the cardiac, clinical, and genetic aspects of arrhythmogenic right ventricular dysplasia (ARVD), a progressive disorder that predominantly affects the right side of the heart and causes ventricular arrhythmias.

Detailed description: BACKGROUND:

ARVD is an uncommon disorder but is considered a major cause of sudden death and life-threatening arrhythmia, in particular in the young population. The prevalence of ARVD is unknown but is certainly underestimated because of the difficulties in obtaining a correct diagnosis. It appears to be particularly frequent in certain geographical areas, probably for a founder effect, such as in northeast Italy, where a large number of ARVD cases and families have been described. A noncontrolled study of the University of Padua reported a frequency of familial forms of about 30 percent, indicating the existence of a defective gene in a large proportion of cases. In the United States the frequency of the disease is unknown, but the number of cases seems to be increasing.

The etiology of ARVD was unknown until very recently. The main hypothesis involved apoptotic mechanisms and, in some cases, a viral infection. However, in the last couple of years, two genes causing ARVD have been identified. The first one encodes plakoglobin, a protein of the cardiac junctions with adhesive and signaling functions. The second ARVD gene is the cardiac ryanodine receptor (RYR2), which has been characterized only very recently by Dr. Danieli's group. In fact, this discovery is so recent that in this study, RYR2 is still considered a potential candidate. The discovery of the first disease genes provides the basis for a candidate gene approach following the hypothesis of a "final common pathway." Thus, major candidates become genes involved in cell-cell adhesion and encoding ion channels.

DESIGN NARRATIVE:

This is a multidisciplinary, multicenter, collaborative study investigating the cardiac, clinical, and genetic aspects of ARVD. The specific aims are (1) to establish a North American ARVD Registry enrolling ARVD patients and their family members, based on standardized diagnostic test criteria, in a prospective longitudinal follow-up study; (2) to determine the genetic background of ARVD by identifying chromosomal loci and specific gene mutations associated with this disorder; (3) to determine the influence of the genotype on the clinical course of patients with ARVD and explore phenotype-genotype associations that will contribute to improved diagnosis, risk stratification, and therapy; and (4) to develop quantitative methods to assess right ventricular function in order to enhance the specificity and sensitivity of ARVD diagnosis.

Eligibility criteria: Inclusion Criteria:

* Males and females over the age of puberty
* Suspected ARVD based on the presence of major or minor Task Force Criteria

Exclusion Criteria:

* Children younger than 12 years of age
* Internal cardioverter defibrillator (ICD) in place for more than 2 years (for probands)
* Individuals with monomorphic ventricular ectopy of predominantly RBBB morphology
* Individuals with obvious cardiomyopathic abnormalities of structure or function predominantly affecting the left ventricle
* Individuals with other conditions that might be mistaken for right ventricular dysplasia such as congenital heart disease, e.g., atrial septal defect, anomalous drainage of the pulmonary vessels into the right atrium, and Ebstein's malformation
* Individuals unwilling to undergo diagnostic testing at the nearest enrolling center

Primary outcomes:
measure: Identifying the cardiac, clinical, and genetic aspects of ARVD
timeFrame: Measured during the course of the study
Secondary outcomes:
Other outcomes:
Locations:
city: Tucson
country: United States
facility: University of Arizona
state: Arizona
Study officials:
affiliation: University of Arizona
name: Frank I. Marcus, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: Baylor College of Medicine
name: Jeffrey Towbin
role: PRINCIPAL_INVESTIGATOR
affiliation: University of Rochester
name: Wojciech Zareba
role: PRINCIPAL_INVESTIGATOR
References:
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