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If the heart is swapped to the right side of the thorax, it is known as "situs inversus with dextrocardia" or "situs inversus totalis". If the heart remains on the normal left side of the thorax, a much rarer condition (1 in 2,000,000 of the general population), it is known as "situs inversus with levocardia" or "situs inversus incompletus".
Dextrocardia situs ambiguus presents a surgical challenge not per se due to associated cardiac malformation, but because achieving adequate exposure is difficult. Right sided structures such as right atrium, right ventricle and tricuspid valve are oriented posteriorly in dextrocardia situs ambiguus (in contrast to dextrocardia with situs inversus).
There is therefore no flow generated in the node, Shh moves at random within it, and 50% of those affected develop situs inversus, which can occur with or without dextrocardia, where the laterality of the internal organs is the mirror-image of normal. Affected individuals therefore have Kartagener syndrome.
Situs ambiguus (from Latin 'ambiguous site'), or heterotaxy, is a rare congenital defect in which the major visceral organs are distributed abnormally within the chest and abdomen. Clinically, heterotaxy spectrum generally refers to any defect of left-right asymmetry and arrangement of the visceral organs; however, classical heterotaxy requires ...
Situs inversus can be a part of primary ciliary dyskinesia (aka Kartagener syndrome) that has recurrent respiratory infections and male infertility. A simple chest xray is sufficient to diagnose dextrocardia, provided care is taken in marking the correct side of the radiograph. Ebstein's anomaly – Malformation of the tricuspid valve (see above).
Neither levocardia nor dextrocardia are indicative of the orientation of the visceral organs, which can be in situs solitus, where the remainder of the organs are on normal side as well; or situs inversus, in which the viscera (stomach, liver, intestines, lungs, etc.) are on the opposite side as normal. The latter condition may or may not be ...
Situs solitus (from Latin 'usual site') is the medical term referring to the normal position of thoracic and abdominal organs. Anatomically , this means that the heart is on the left with the pulmonary atrium on the right and the systemic atrium on the left along with the cardiac apex.
Dextrocardia is characterized by the heart pointing to the right side of the chest, when it normally points to the left. Dextrocardia may or may not be accompanied by situs inversus. [26] Dextrocardia with situs inversus results when, in addition to the heart, the major visceral organs of the body form in the mirror image of their normal ...