What is a common consequence of untreated congenital heart disease seen on chest X-ray findings?

• A. Normal pulmonary vascular markings
• B. Increased heart silhouette size
• C. Flattened diaphragm
• D. Sternal retraction

Answer: (B)

In cases of untreated congenital heart disease, one of the common consequences seen on chest X-ray is an increased heart silhouette size. This enlargement of the cardiac silhouette typically results from volume overload or pressure overload of the heart chambers, depending on the specific type of congenital heart defect.

For instance, defects that cause left-to-right shunting, such as ventricular septal defects or patent ductus arteriosus, can lead to increased blood flow to the pulmonary circulation and subsequent left atrial and left ventricular enlargement. Conversely, defects causing right-to-left shunting may also affect the heart size as the right heart works harder to manage the altered hemodynamics, leading to right ventricular hypertrophy.

The identification of an enlarged heart silhouette on a chest X-ray can provide important diagnostic clues regarding the presence and severity of congenital heart disease, indicating that further evaluation may be required, such as echocardiography or MRI for more detailed visualization of cardiac structures and function.

The options regarding normal pulmonary vascular markings and a flattened diaphragm suggest different pathological processes that may not be directly associated with congenital heart defects in the same way. Sternal retraction is often a sign of respiratory distress rather than a direct consequence of congenital heart disease itself.