Transthoracic echocardiography for initial screening of single coronary artery anomaly: a case with multimodal imaging evaluation
This case report highlights the utility of transthoracic echocardiography as an effective initial screening tool for detecting single coronary artery anomalies, while emphasizing the necessity of coronary computed-tomography angiography for definitive anatomical subtyping and management.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
The human heart relies on a delicate network of blood vessels to keep its muscle supplied with oxygen. Usually, two main arteries branch off the aorta to feed the heart: one on the right and one on the left. In rare instances, a person is born with a single coronary artery anomaly, a condition where only one of these arteries exists, and it must do the work of both. This is not merely a matter of having fewer pipes; the path the vessel takes through the chest matters deeply. If the single artery squeezes between the heart's major pumping chambers, it can be dangerous, especially during exercise. However, if it travels safely along the surface of the heart, the risk is much lower. Doctors often struggle to spot these hidden variations in adults because the heart is deep inside the chest, and standard imaging can sometimes miss the missing artery entirely.
A team of researchers at The First Hospital of Jilin University recently shared the story of a 73-year-old woman who arrived with chest pain, leading to the discovery of just such a rare condition. The medical team began with a standard ultrasound of the heart, known as a transthoracic echocardiogram. This non-invasive test uses sound waves to create moving images of the heart's structure and blood flow. In this patient, the ultrasound revealed a clear clue: the right coronary artery was wider than normal, and the spot where the left artery should have started was empty. Furthermore, the ultrasound detected blood flowing through the middle wall of the heart in a pattern that usually belongs to the missing left artery. These indirect signs suggested that the single right artery had taken an unusual route to supply the entire heart.
To confirm what the ultrasound hinted at, the doctors turned to a more detailed scan called a coronary computed-tomography angiography. This test creates a three-dimensional map of the blood vessels. The scan confirmed that the woman had no left coronary artery at all. Instead, her single right coronary artery was dominant and carried a small amount of plaque, causing a mild narrowing of about 30 percent. Most importantly, the scan showed that a branch of this right artery, which normally supplies the back of the heart, had grown unusually long. It stretched forward across the heart to reach the front, taking over the job of the missing left artery. Based on the specific path the vessel took, the team identified this as a Lipton-Yamanaka type R-I anomaly. This classification describes a single artery that starts on the right side and travels safely along the heart's surface, rather than squeezing between the major vessels, which is a much more dangerous configuration.
The patient was not treated with surgery or invasive procedures. Because the artery followed a safe path and the blockage was mild, the medical team decided on a conservative approach. They prescribed medication to manage the plaque and control risk factors, such as blood pressure and cholesterol. The researchers noted that while the woman's chest pain might have been related to the mild narrowing, the presence of a single artery means that any future blockage could affect a large portion of the heart muscle. Therefore, lifelong monitoring and strict management of heart health are essential. This case highlights that a standard ultrasound can serve as a powerful first step in spotting these rare birth defects, even in older adults. While the ultrasound can raise the alarm and point to the problem, a detailed three-dimensional scan is still required to map the exact route of the vessel and ensure the patient receives the right care.
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