Linkage Study of Long QT Syndrome In An Amish Kindred

This study has been completed.
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI) Identifier:
First received: May 25, 2000
Last updated: June 23, 2005
Last verified: November 2001
To screen by electrocardiography the entire population of 1,400 individuals in seven Amish Mennonite communities in order to perform genetic linkage studies of long QT syndrome (LQTS).

Heart Diseases
Cardiovascular Diseases
Tachycardia, Ventricular
Ventricular Fibrillation
Long QT Syndrome

Study Type: Observational
Study Design: Observational Model: Natural History

Resource links provided by NLM:

Further study details as provided by National Heart, Lung, and Blood Institute (NHLBI):

Study Start Date: January 1990
Estimated Study Completion Date: December 1992
Detailed Description:


LQTS is a severe heart disorder leading to sudden death due to ventricular tachycardia or ventricular fibrillation. The syndrome segregated as a Mendelian recessive in the highly inbred population under study and resulted in the sudden death of several members of the population.


The entire population was screened to identify cases of LQTS. In addition, 29 obligate heterozygotes were studied by 24-hour Holter monitoring to determine whether these gene carriers had any subtle phenotypes. The data were subjected to complex segregation and linkage analysis to establish the mode of inheritance and penetrance of LQTS.


Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No
No eligibility criteria
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

No Contacts or Locations Provided
  More Information

No publications provided Identifier: NCT00005250     History of Changes
Other Study ID Numbers: 1132 
Study First Received: May 25, 2000
Last Updated: June 23, 2005
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Long QT Syndrome
Cardiovascular Diseases
Tachycardia, Ventricular
Ventricular Fibrillation
Arrhythmias, Cardiac
Cardiovascular Abnormalities
Congenital Abnormalities
Heart Defects, Congenital
Heart Diseases
Pathologic Processes processed this record on February 04, 2016