CPT® Code 33277

Add-On Code

1. Indications

The insertion of a phrenic nerve stimulator transvenous sensing lead is indicated for patients diagnosed with moderate to severe central sleep apnea (CSA). This condition is characterized by the brain's intermittent failure to signal the muscles that control breathing, leading to disrupted sleep and potential health complications. The following factors may contribute to the development of CSA:

• Cardiovascular Disease: Conditions affecting the heart and blood vessels can impact respiratory function.
• Stroke: Neurological damage from a stroke may disrupt normal breathing patterns.
• Conditions Affecting the Neck or Brainstem: Any pathology in these areas can interfere with the signals necessary for breathing.
• Morbid Obesity: Excess weight can lead to respiratory difficulties, including CSA.
• Narcotic Use: Certain medications can depress the respiratory system, contributing to CSA.

2. Procedure

The procedure for inserting a phrenic nerve stimulator transvenous sensing lead involves several detailed steps to ensure proper placement and functionality of the device:

• Step 1: The procedure begins with the patient being placed under conscious sedation, allowing them to communicate with the physician during the intervention. Access to the right side venous system is achieved through a small incision in either the cephalic or subclavian vein.
• Step 2: A sheath is placed in the vein, and two long access wires are advanced into the vena cava to facilitate further catheterization.
• Step 3: A guide catheter is then delivered over one of the access wires into the superior vena cava and advanced into the left brachiocephalic vein (LBC), positioning the tip at the left subclavian junction.
• Step 4: Using contrast, venous branches are identified, and an inner catheter is threaded into the guide catheter, telescoping beyond it to access the pericardiophrenic vein (PPV).
• Step 5: The opening of the PPV is visualized and accessed with a coronary guidewire while the patient is instructed to take deep breaths to aid in the advancement of the catheter.
• Step 6: The guide catheter is advanced, and the inner catheter is removed. The stimulation lead is then loaded and deployed through the guide catheter to the target location, ensuring that surrounding vessels are not damaged.
• Step 7: If placement in the left pericardiophrenic vein is not feasible, the guide catheter is exchanged for a short introducer sheath in the right subclavian vein, allowing for the transvenous implantation of an alternate lead into the right brachiocephalic vein.
• Step 8: Once the lead is in position, stimulation is tested using a system analyzer, and patient feedback is obtained to confirm proper function. Any necessary repositioning is performed, and the lead is stabilized with sutures before being connected to the pulse generator.
• Step 9: The need for a sensing lead is assessed. If required, it is deployed by threading a coronary sinus right guide catheter over the second venous access wire to a location between the tracheal carina and the junction of the brachiocephalic veins.
• Step 10: The opening of the azygos vein is visualized with contrast, and a wire is advanced to the diaphragm level, facilitated by the patient taking deep breaths or coughing.
• Step 11: The inner catheter is advanced over the wire, followed by the guide catheter, which is then advanced to the right lateral branch of the azygos vein for lead deployment.
• Step 12: The placement of the lead is assessed, tested, stabilized, and connected to the pulse generator, which is placed in a subcutaneous pocket formed below the clavicle and secured in place. Finally, the entire system is checked for proper function.

3. Post-Procedure

After the insertion of the phrenic nerve stimulator transvenous sensing lead, patients are typically monitored for any immediate complications or adverse reactions. Post-procedure care may include instructions on activity restrictions, signs of infection at the incision site, and follow-up appointments to assess the functionality of the device. Patients may also be advised on lifestyle modifications to enhance the effectiveness of the therapy for central sleep apnea. Regular follow-up is essential to ensure the device is functioning correctly and to make any necessary adjustments based on the patient's feedback and clinical evaluations.