Holt-Oram Syndrome Workup

Updated: May 05, 2016
  • Author: Craig T Basson, MD, PhD; Chief Editor: Yasmine Subhi Ali, MD, FACC, FACP, MSCI  more...
  • Print
Workup

Radiography

Wrist radiography

Limb involvement is determined by physical examination in some cases. If limb involvement is not grossly obvious, obtain upper limb and hand radiographs to detect subtle anomalies of the wrist bones, as shown below.

Posteroanterior radiograph of the hands of a patie Posteroanterior radiograph of the hands of a patient with Holt-Oram syndrome. The distal phalanx of the left thumb is hypoplastic. The carpal bones of both hands are abnormal, but the abnormalities on the left side are greater than those on the right side. Left-sided upper limb radial ray abnormalities are often greater than those on the right side. The scaphoid and trapezium of the left hand are enlarged and misshapen, resulting in a distal displacement of the thumb. Note the marked abnormalities of the left capitate and hamate. The left radial stylus is flattened.

Individuals without carpal bone abnormalities in the preaxial radial bones do not have Holt-Oram syndrome.

Chest radiography

Findings may demonstrate enlarged pulmonary arteries due to pulmonary hypertension or cardiomegaly. Evidence of congestive heart failure may be present.

Next:

Echocardiography

Echocardiography is the imaging study of choice to define the presence of septal defects or other cardiac anomalies. The most common cardiac anomaly is ostium secundum ASD. Some patients also may have an isolated VSD.

Unexplained, significant right atrial enlargement in the fetus may signify Holt-Oram syndrome; consider a thorough evaluation for upper extremity abnormalities and discuss genetic testing with the parents. [9]

Severely affected individuals may present with multiple VSDs (Swiss-cheese septum). Other cardiac anomalies may include abnormal isomerism and anomalous pulmonary venous return.

Although rare, numerous varieties of complex congenital heart disease may be associated with Holt-Oram syndrome.

Previous
Next:

Electrocardiography and Holter Monitoring

Perform an ECG to define involvement of the conduction system. If intermittent dysrhythmia is considered, 24-hour Holter monitoring may be useful.

Periodic evaluation for conduction system involvement, even in the absence of cardiac structural disease, is important given the progressive nature of this finding. ECG evaluations should include consideration of atrial fibrillation.

Previous
Next:

Genetic Evaluation

Genetic evaluation is important. [10, 11]

Arrange for patients who may possibly have Holt-Oram syndrome to be evaluated by a cardiologist or geneticist with experience in the management of inherited cardiovascular disease.

Obtain a detailed family history to ascertain if the disease represents a new mutation or if it is part of a familial syndrome.

Consider wrist radiography of the parents of the patient with Holt-Oram syndrome to establish a familial versus sporadic nature of the syndrome in the family.

Mutational analysis of TBX5 is not available on a routine clinical basis and remains a research tool. TBX5 mutations are detected in about 75% of individuals meeting strict clinical criteria for Holt-Oram syndrome. [3] On a case-by-case basis, specifics regarding genotype-phenotype correlations are not available. The ability to identify the disease causing mutation in a family may allow for expanded reproductive options such as preimplantation genetic diagnosis for couples at 50% risk of having an affected child. [12]

Previous
Next:

Procedures

Cardiac catheterization can be considered to define the nature and severity of intracardiac shunts in patients at high risk for Eisenmenger syndrome because these patients may require surgical intervention.

Previous