CPT® Code 37605

The procedure described by CPT® Code 37605 involves the ligation of the internal or common carotid artery, which is a critical vascular structure supplying blood to the brain. The process begins with an incision made in the skin over the bifurcation of the carotid artery, allowing for the dissection of soft tissues to expose both the common and internal carotid arteries. This exposure is essential for the subsequent steps of the procedure. A puncture is made in the internal carotid artery, and a pressure recording device is inserted and advanced toward the base of the skull. This device is crucial for monitoring internal carotid pressures throughout the procedure, ensuring that cerebral blood flow is adequately assessed. The common carotid artery is typically the preferred site for ligation. During the procedure, the common carotid artery is clamped, and the adequacy of cerebral blood flow is evaluated. If the blood flow is deemed sufficient, the artery is ligated, or tied off, using either a suture or a thin wire. However, if the evaluation indicates that cerebral blood flow is severely compromised, the procedure may shift to ligating the internal carotid artery instead. In this case, the internal carotid artery is also clamped, and cerebral blood flow is again assessed. If the flow remains adequate, the internal carotid artery is ligated. This procedure is critical in managing conditions that may require the reduction of blood flow to certain areas of the brain, thereby preventing complications associated with vascular insufficiency.