Bypass Surgery vs Stent Placement: Which Is Best for Blocked Arteries?

Comparison of Bypass Surgery and Stent Placement for Coronary Artery Treatment

Understanding Coronary Arteries

Coronary arteries are vital blood vessels that supply blood to the heart. They are categorized into left and right coronary arteries. The left coronary artery is particularly significant, providing blood to over half of the heart muscle and delivering essential nutrients and oxygen for optimal heart function. The heart muscle regulates blood supply through its pumping action, adjusting to the body’s changing demands for oxygen and nutrients during various activity levels.

The Role of the Heart in Blood Supply

As physical activity increases, the body’s demand for blood supply rises to eliminate waste and obtain additional oxygen and nutrients. Consequently, the heart accelerates its pumping action, leading to a higher heart rate. For the heart to function effectively, a consistent and adequate blood flow to its muscle is crucial.

Impact of Left Coronary Artery Disease

In cases of left coronary artery disease, atherosclerosis—characterized by the buildup of fatty deposits—narrows the arteries, restricting blood flow to the heart. When physical demands increase, the heart compensates by pumping faster to deliver necessary nutrients and oxygen. However, in the presence of atherosclerosis, this oxygen supply is diminished, heightening the risk of a heart attack.

Recognizing Heart Attack Symptoms

A heart attack can manifest as an unusual sensation in the chest, including pain, heaviness, tightness, and pressure, which may radiate to the arms, shoulders, jaw, neck, and back. Symptoms can also include shortness of breath and fatigue. Risk factors for coronary artery disease encompass smoking, elevated cholesterol levels, high blood pressure, obesity, diabetes, and low physical activity.

Surgical Interventions for Coronary Artery Disease

To restore blood supply and ensure proper heart muscle function, surgical options may be necessary. Two common procedures are coronary artery bypass graft (CABG) and percutaneous cardiac intervention (PCI). CABG involves bypassing the blocked artery using a vessel from another part of the body. In contrast, PCI entails inflating a balloon at the narrowing to compress plaque against the vessel wall, often accompanied by the placement of a stent to keep the artery open. Some stents are medicated to prevent re-narrowing.

Clinical Trial Findings

A trial published in the New England Journal of Medicine evaluated the effectiveness of PCI versus CABG. The study assessed both interventions’ impact on mortality, stroke, and heart attack rates at 30 days and three years post-surgery. It involved 1,905 patients from 126 sites across 17 countries, randomly assigned to either CABG (957 patients) or PCI (948 patients). Conducted over four years from 2010 to 2014, the PCI group utilized everolimus-coated stents to inhibit arterial tissue growth around the stent, thus preventing artery re-narrowing.

Study Results

At the three-year mark, patients receiving PCI experienced a 0.7% higher incidence of death, stroke, or heart attack compared to those who underwent CABG. At 30 days, 4.9% of patients in the PCI group faced such outcomes, while the CABG group reported 7.9%. The study concluded that PCI with everolimus-eluting stents is as effective as CABG for patients with left main coronary artery disease eligible for both procedures.

Written By: Alefyah Sunel, Medical Writer