View clinical trials related to Heterotaxy Syndrome.
Filter by:The goal of this study is to obtain specimens and data from individuals and their families with heterotaxy and related congenital heart defects in order to clarify the molecular genetics of this disorder. The knowledge gained from the analysis of this information will provide the basis for future genetic counseling as well as contribute to knowledge about the biology of normal and abnormal development of left-right anatomic asymmetry.
The investigators aim with this study is to investigate the mechanisms of immune deficiency in patients with heterotaxy syndrome through the use of novel biomarkers and a prospective questionnaire survey documenting the burden of infectious sequelae following enrollment. It is known that patients with under-active spleens (functional asplenia or hyposplenia) secondary to other (non-cardiac) conditions such as Sickle Cell Disease or Inflammatory Bowel Disease have a characteristic paucity of a B cell sub-class known as IgM memory B cell. This specific sub-class of B cell normally matures in the spleen and in those with an improperly functioning spleen a significant deficiency of this B cell class is seen on flow cytometry. Similarly, these same patients are noted to have increased amounts of 'junk' DNA / nuclear remnant in their red cells. This is seen on microscopy as a dark particle inside the red cell and is termed a Howell Jolly Body (normally less than 2% of red cells have these dark particles present). Part of a functioning spleen's normal task is to rid the blood of red cells that contain nuclear remnants and an under-active spleen gets behind on this task with a build-up of Howell Jolly Bodies in red cells present in the bloodstream. Flow cytometry can very quickly and accurately quantify Howell Jolly Bodies as well as IgM memory B cells from a small (~1.5cc) sample of blood. Normal IgM memory B cell ranges are known for healthy children from infancy onwards allowing interpretation of results against normative data ranges. The investigators aim to enroll 10 patients in this pilot study who have a diagnosis of heterotaxy syndrome (both asplenia and polysplenia) and to prospectively follow them after obtaining the initial biomarker sample. The family will be contacted once every two weeks for a period of 12 weeks and asked a series of simple questions taking approximately 5 minutes on any recent infectious sequelae or symptoms. The questions will elucidate history of minor illness such as low-grade fever or cough to more significant events such as admission for in-patient antibiotic therapy of bacterial sepsis. Ultimately, with this pilot study, the investigators hope to obtain sufficient data to support funding applications for a larger, multi-center trial that will allow us to develop biomarker thresholds for future risk of sepsis.
Infants with heterotaxy syndrome (HS) are born with an abnormal arrangement of organs along the right-left body axis. Abnormalities of intestinal rotation and fixation are commonly associated with HS. Malrotation is the most worrisome intestinal rotation abnormality (IRA). Advances in cardiac surgery have improved HS mortality such that there is increasing attention to IRA and their management. The objective of this research project is to prospectively observe a cohort of infants with HS and IRA and evaluate their long term outcomes. Specifically, the investigators would like to determine what is the natural history of asymptomatic IRA in patients with HS and what is the morbidity and mortality secondary to an elective Ladd procedure for asymptomatic IRA in a population with HS? The investigators plan a prospective, multi-center, observational study to follow this complicated group of patients. This will be a web-based database collected from major cardiac tertiary care centers in both Canada and the United States. Patients with HS will be recruited by their primary site and clinical data will be collected by their primary site prospectively throughout childhood until they are at least five years of age. This patient population will be followed by their own clinical care givers; this is not an interventional study. No additional clinic visits will be required and the patients will not have to be contacted. Patient medical records will be accessed by a member of the study team at the primary site at least once per year or more frequently if interventions are required or complications develop.
This study will examine genetic material obtained from blood and tissue samples of patients with congenital heart disease (CHD) and heterotaxy (an abnormality in the left-right positioning of organs in the body, also called situs inversus) to gain a better understanding of these disorders and of a lung disease called primary ciliary dyskinesia (PCD). CHD is prevalent in patients with heterotaxy. It is believed that certain forms of CHD or heterotaxy may have the same genetic origin as PCD. Individuals 2 years of age or older who have a CHD or heterotaxy or both may be eligible for this study. Participants undergo some or all of the following tests and procedures: - Blood tests, electrocardiogram (EGC) and chest x-ray. - Saliva collection: Subjects rinse their mouth with water, and then spit approximately 1.5 cc of saliva into a sterile container. - Buccal swabs: A small soft, toothbrush-like swab is rubbed on the inside lining of the cheek to collect tissue samples. - Nasal tests to measure nasal nitric oxide levels and to obtain tissue samples from the inside of the nostrils: For the nitric oxide level test, a rubber probe is inserted into one of the nostrils until it fits snugly and comfortably. The subject then takes a deep breath and then exhales all the way out through the mouth through a plastic device. During exhalation, gas measurements are recorded on a computer. To obtain tissue samples, a device is inserted in a nostril and scraped gently against the inside of the nose. - Echocardiography: This ultrasound test of the heart uses sound waves to obtain pictures of the heart. A small wand with a warm clear gel is moved around the chest to obtain the images. - Abdominal ultrasound: This ultrasound test of the heart uses sound waves to obtain pictures of the abdominal organs. A small wand with a warm clear gel is moved around the abdomen to obtain the images....
Heterotaxy syndrome is a heterogeneous disease that is the result of a failure of normal right-left lateralization of the abdominal and thoracic organs during development. The major clinical manifestations include intestinal malrotation, functional asplenia and complex cyanotic heart disease. Hypothesis: There exists a yet, un-recognized, racial distribution in heterotaxy syndrome.