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: May 12, 2016
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

Resource links provided by NLM:

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

Study Start Date: January 1990
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.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.


Ages Eligible for Study:   up to 100 Years
Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No
No eligibility criteria
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No Contacts or Locations Provided
  More Information Identifier: NCT00005250     History of Changes
Other Study ID Numbers: 1132  R01HL041035 
Study First Received: May 25, 2000
Last Updated: May 12, 2016
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 May 26, 2016