Dextrocardia: Understanding Complex Anatomy to Treat This Disorder

Dextrocardia occurs in approximately 1 in 10,000 live births and is frequently dismissed as an incidental anatomic variant, particularly when accompanied by situs inversus totalis and a structurally normal heart. Ultimately, dextrocardia reflects a disruption of embryonic left-right axis determination. While situs inversus totalis is often associated with relatively low rates of congenital heart disease, dextrocardia with situs solitus or situs ambiguus is more likely to occur with complex structural abnormalities. Such congenital conditions include single-ventricle physiology, which can require surgical correction and result in Fontan circulation or anomalous venous connections. Chronic conditions further complicate this disease, such as hemodynamic compromise from pulmonary hypertension. These anatomic differences affect multiple aspects of cardiovascular care. In electrocardiography, the mirror-image orientation of the heart can result in abnormal electrocardiogram that may indicate ischemia when none is present; lead adjustment is needed to mitigate this. In interventional cardiology, modifications must be made during coronary angiography or percutaneous coronary intervention, namely, reversal of catheter direction and proper interpretation of fluoroscopic views. Cardiac surgery presents similar issues because the cannulation strategy, operative exposure, and graft orientation must all account for the heart's reversed position. Dextrocardia is a fascinating problem in which a single embryologic misstep can ripple through everything from the interpretation of a 12-lead electrocardiogram to planning a transplant operation. Managing these patients requires recognizing the mirror-image arrangement and adjusting diagnostic and procedural strategies. Once the spatial inversion clicks into place, the rest is familiar ground.