Scrambler Therapy in Treating Chronic Pain in Patients With Rash From Varicella Zoster Virus Infection

Inclusion Criteria:

• Pain of >= 1 month (30 days) duration attributed to zoster, for which the patient wants intervention
• Pain at least a four out of ten problem during the prior week, on a 0-10 scale where zero was no problem and ten was the worst possible problem
• Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) = 0, 1, or 2
• Life expectancy >= 3 months (90 days)
• Ability to complete questionnaire(s) by themselves or with assistance
• Provide informed written consent

Exclusion Criteria:

• Any of the following because this study involves an investigational agent whose genotoxic, mutagenic and teratogenic effects on the developing fetus and newborn are unknown
• Pregnant women
• Patients with implantable drug delivery systems, e.g. Medtronic Synchromed
• Patients with heart stents or metal implants such as pacemakers, automatic defibrillators, aneurysm clips, vena cava clips and skull plates; (metal implants for orthopedic repair, e.g. pins, clips, plates, cages, joint replacements are allowed as are central venous access devices)
• Patients with a history of myocardial infarction or ischemic heart disease within the past six months
• Patients with history of epilepsy, brain damage, use of anti-convulsants for seizure prevention, symptomatic brain metastases; Note: anti-convulsant use is allowed for neuropathy and heart failure (HF) if on a stable dose
• Other identified causes of pain in the area that was affected by herpes zoster
• Skin conditions such as open sores that would prevent proper application of the electrodes
• Other medical or other condition(s) that in the opinion of the investigators might compromise the objectives of the study
• Prior treatment with Calmare MC-5A therapy
• Patient initiation of a new analgesic treatment within 7 days prior to initiation of protocol treatment