Contribution of Insulin-Like Growth Factor-I (IGF-I) and Its Binding Protein (IGFBP3) to Increased Left Ventricular Mass in Familial Hypertrophic Cardiomyopathy Caused by Distinct Sarcomeric Mutations
Data Collection
Aortic Valve Disease+10
+ Aortic Stenosis, Subvalvular
+ Aortic Valve Stenosis
Summary
Study start date: February 1, 1999
Actual date on which the first participant was enrolled.Hypertrophic cardiomyopathy (HCM) is a genetic disease with an autosomal dominant pattern of inheritance which is characterized by left ventricular hypertrophy (LVH). HCM is often caused by missense mutations of genes that encode for sarcomeric proteins. The LVH varies markedly in patients with identical sarcomeric gene mutations, and notably, 20 to 40% of subjects with disease mutation do not have LVH as assessed by echocardiography. These findings suggest that other factors affect LV wall thickness in HCM. We wish (1) to investigate the potential role of IGF-I and its binding protein, IGFBP3, in determining increased LV mass in HCM caused by sarcomeric mutations; and (2) to assess myocardial ultrasound backscatter, exercise tolerance, and propensity to arrhythmias, in subjects who have inherited sarcomeric mutations but who do not have LVH.
Protocol
This section provides details of the study plan, including how the study is designed and what the study is measuring.175 patients to be enrolled
Total number of participants that the clinical trial aims to recruit.Eligibility
Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.Any sex
Biological sex of participants that are eligible to enroll.Healthy volunteers not allowed
If individuals who are healthy and do not have the condition being studied can participate.Conditions
Pathology
Criteria
INCLUSION CRITERIA HCM subjects 5 years or older, with distinct sarcomeric gene mutations and LV wall thickness greater than 15 mm in subjects older than 18 years, and greater than 2 SDs in subjects 18 years of age or younger, as assessed by MRI. Age- and gender-matched blood relatives with sarcomeric gene mutations but without LVH. Age- and gender-matched blood relatives without sarcomeric gene mutations. EXCLUSION CRITERIA History of hypertension (basal systolic and diastolic pressures above 170 mm Hg and 95 mm Hg, respectively) or another systemic or cardiac disease that may cause cardiac hypertrophy. History of recent acute illness or other chronic illness that might affect plasma levels of IGF-I and IGFBP3. History of thyrotoxicosis, diabetes mellitus or abnormally elevated fasting blood sugar. Any conditions which would exclude patients from undergoing MRI scan.
Study Centers
These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.This study has 1 location
National Heart, Lung and Blood Institute (NHLBI)
Bethesda, United StatesOpen National Heart, Lung and Blood Institute (NHLBI) in Google Maps