CPT® Code 33288

1. Indications

The removal and replacement of a phrenic nerve stimulator, as described by CPT® Code 33288, is indicated for patients who have a previously implanted phrenic nerve stimulator system that is no longer functioning effectively or has become compromised. This procedure is specifically performed for individuals diagnosed with moderate to severe central sleep apnea (CSA), a condition characterized by repeated interruptions in breathing during sleep due to the brain's failure to send appropriate signals to the muscles that control breathing.

• Moderate to Severe Central Sleep Apnea (CSA) The primary indication for this procedure is the management of moderate to severe CSA, where the phrenic nerve stimulator is essential for maintaining adequate respiratory function during sleep.

2. Procedure

The procedure for the removal and replacement of the phrenic nerve stimulator involves several detailed steps to ensure the safe and effective transition from the old device to the new one.

• Step 1: Incision and Access An incision is made over the existing device located in its subcutaneous pocket. This initial step is crucial as it provides the necessary access to the implanted phrenic nerve stimulator and its associated lead(s).
• Step 2: Device and Lead Disconnection The device and lead(s) are carefully freed from the surrounding tissue to minimize damage. The lead(s) are then disconnected from the existing generator, allowing for the removal of the old device.
• Step 3: Assessment of the Pocket After the existing generator is removed, the surgical team assesses the pocket for any necessary revisions before placing the new generator. This step ensures that the new device will fit properly and function effectively.
• Step 4: Insertion of New Device The new phrenic nerve stimulator is placed into the pocket, and the existing lead(s) are reconnected to the new generator. This step is critical for restoring the device's functionality.
• Step 5: Lead Extraction (if applicable) If the replacement involves the stimulation or sensing lead(s), an incision is made to expose the previously implanted lead(s). A stylet or stiff guidewire is inserted onto the lead under fluoroscopic guidance, and gentle manual traction is applied. If the lead is not removable, a locking stylet is used, and a manual rotational extractor or laser sheath is advanced over the lead to facilitate extraction.
• Step 6: Placement of New Lead A new guiding sheath is placed into the venous system, and a new lead is advanced to the target vessel, which may be either the left pericardiophrenic vein or the right brachiocephalic vein. This step is essential for ensuring that the new lead is positioned correctly for optimal function.
• Step 7: Testing and Stabilization Once the lead is in position, it is tested using a system analyzer, with feedback from the patient regarding the stimulation's effectiveness and any discomfort. After confirming proper function, the lead is stabilized with sutures and connected to the pulse generator in its subcutaneous pocket.

3. Post-Procedure

Post-procedure care following the removal and replacement of the phrenic nerve stimulator involves monitoring the patient for any immediate complications related to the surgery. Patients are typically advised to rest and avoid strenuous activities for a specified period to allow for proper healing. Follow-up appointments are essential to assess the functionality of the new device and to make any necessary adjustments to the programming. Patients may also receive instructions on wound care to prevent infection and ensure optimal recovery. It is important for healthcare providers to educate patients about signs of potential complications, such as increased pain, swelling, or unusual discharge from the incision site, and to encourage them to report any concerns promptly.