Can Extracorporeal Shock Wave Therapy (SoftWave) Be Used in Patients with Pacemakers?
Extracorporeal shock wave therapy can generally be performed safely in patients with pacemakers when specific precautions are followed, but certain device types require special management or may be contraindicated.
Key Safety Considerations
The evidence base comes primarily from lithotripsy studies (a form of shock wave therapy), which provides the most relevant guidance for SoftWave therapy in pacemaker patients 1, 2.
Pre-Procedure Requirements
Before proceeding with shock wave therapy in a pacemaker patient, you must:
- Obtain cardiology clearance - The patient's cardiologist must approve the procedure and be familiar with the specific pacemaker model 3, 4, 5
- Identify pacemaker type and location - Document whether it's single-chamber, dual-chamber, or rate-responsive 1, 6
- Determine pacemaker dependency - Establish if the patient requires continuous pacing for survival 7
- Verify device location relative to treatment area - The pacemaker generator should be at least 5 cm away from the shock wave focal point 4, 5, 8
Device-Specific Programming
For dual-chamber pacemakers: Reprogram to single-chamber (VVI) mode before the procedure. Dual-chamber devices can experience inappropriate ventricular output inhibition when the atrial paced event triggers the shock wave system 4, 5, 8.
For rate-responsive pacemakers: The activity-sensing feature MUST be programmed off (to non-rate-responsive VVI mode). This is critical because piezoelectric sensors in these devices can be damaged by shock waves or cause inappropriate rate acceleration 4, 5, 8. If the rate-responsive pacemaker is implanted in the abdomen and will be close to the treatment field, the procedure should not be performed 5, 8.
For standard single-chamber (VVI) pacemakers: These generally require no reprogramming and can safely undergo treatment 8.
Intra-Procedure Monitoring
During the procedure, you must have:
- Continuous ECG monitoring - Essential for detecting any rhythm disturbances 7, 1
- Pulse oximetry - Allows pulse determination even when electromagnetic interference affects the ECG 7
- Cardiologist availability - A cardiologist should be nearby with equipment to manage complications 4, 5, 9
- Emergency equipment ready - Including temporary pacing capability if needed 9
Post-Procedure Protocol
After completing shock wave therapy:
- Interrogate the device - Check for any changes in programming, threshold elevations, or damage 7, 1, 6
- Restore original settings - Reprogram dual-chamber or rate-responsive features back to baseline 7, 6
- Document any threshold changes - Shock waves can cause local tissue heating and myocardial damage at the electrode-tissue interface, potentially elevating pacing thresholds 1
Absolute Contraindications
Do not perform shock wave therapy if:
- Rate-responsive pacemaker is in the abdomen and cannot be kept 5+ cm from the focal point 5, 8
- Patient cannot tolerate temporary reprogramming to VVI mode 4
- Pacemaker-dependent patient and cardiology support is unavailable 7
Evidence Quality Note
The guidelines addressing electromagnetic interference with pacemakers focus primarily on surgical electrocautery and lithotripsy 7, 1, 7, 6, 2. While SoftWave therapy uses different energy delivery than lithotripsy, the fundamental electromagnetic interference principles and safety precautions remain applicable. The lithotripsy literature demonstrates successful treatment of over 130 pacemaker patients with only 4 minor complications and no deaths 9, supporting the safety of shock wave therapy when proper protocols are followed.
The most critical factors are maintaining adequate distance from the device (≥5 cm), appropriate device reprogramming based on type, continuous monitoring, and immediate cardiology support availability 3, 4, 5, 8.