Electrotherapy for Chronic Low Back Pain in a Patient with a Pacemaker
A 66-year-old man is referred for physiotherapy with chronic non-specific low back pain of 9 months' duration. He has a permanent cardiac pacemaker implanted 2 years ago for bradyarrhythmia, and he takes warfarin for atrial fibrillation. He also has type 2 diabetes with reduced sensation in both feet on monofilament testing. He has heard that electrical stimulation and heat help back pain and asks for 'the machine treatment'. On assessment he reports pain 6/10, reduced lumbar flexion, and no red flags. He is keen to avoid medication and wants a passive treatment that he can have during his sessions.
1. Evaluate the safety of transcutaneous electrical nerve stimulation and superficial heat in this patient, and explain the reasoning behind each decision.
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TENS: standard TENS is generally considered a precaution or contraindication with implanted cardiac devices, particularly pacemakers and implantable defibrillators, because current can interfere with sensing and pacing. Manufacturer guidance and local policy must be checked; without explicit clearance, TENS over the trunk or near the device should not be used. The safest position is not to apply it. If it were ever considered, it would require cardiology and device-team clearance and application away from the chest, but this patient does not need it and the risk is not justified.
Superficial heat: heat over the lower back is not directly over the pacemaker, but caution is needed because of reduced sensation in the feet and diabetes - thermal injury risk is increased where sensation is impaired, and heat should not be applied to areas of sensory loss. Lumbar heat with careful skin checks and a time limit is lower risk than TENS but still requires monitoring. The patient should not lie on a heat pad, and the device should not be left unattended.
Warfarin: both modalities carry a theoretical risk of skin reactions and burns, and with anticoagulation any skin damage is more significant. Skin integrity should be checked before and after.
Conclusion: do not use TENS. Use heat only with caution, away from the device and areas of sensory loss, with skin checks. Explain the reasoning to the patient.
2. He is disappointed and asks why he cannot have 'the machine'. How do you respond, and what active plan do you offer instead?
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Acknowledge his preference and explain clearly: the pacemaker means electrical stimulation could interfere with his heart device, and his reduced foot sensation and warfarin mean heat carries a burn risk. This is about his safety, not about withholding treatment.
Explain that passive treatments give short-lived relief at best and do not address the reasons his back pain persists. Offer an active, evidence-based plan:
- Education: explain the nature of chronic low back pain and that staying active is safe and helpful.
- Exercise: a graded programme of movement and strengthening tailored to his ability, starting at a level he can tolerate and progressing.
- Activity: build toward regular walking and daily activity, with pacing.
- Self-management: simple analgesia discussion with his GP, sleep and stress factors, and a plan for flare-ups.
- Foot care: given reduced sensation, include foot checks and advice on footwear.
Agree goals with him, review progress, and document the discussion and his agreement. If he remains distressed, consider a shared decision-making conversation about expectations.