1. Aetna considers electrical stimulation (electrical current via electrodes placed directly on the skin in close proximity to the ulcer) medically necessary durable medical equipment (DME) for the management of the following types of chronic ulcers when it is used as adjunctive therapy after there are no measurable signs of healing for at least 30 days of treatment with conventional wound treatments.

   1. Arterial ulcers; or
   2. Diabetic ulcers; or
   3. Stage III (defects extending into the muscle) or Stage IV (defects extending into the bone or the joint) pressure ulcers; or
   4. Venous stasis ulcers.

   Aetna considers electrical stimulation for chronic ulcers experimental and investigational when these criteria are not met.

   Note: Conventional wound treatments include optimization of nutritional status, debridement by any means to remove devitalized tissue, maintenance of a clean, moist bed of granulation tissue with appropriate moist dressings, and necessary care to resolve any infection that may be present.  Specific wound care based on type of wound includes frequent repositioning of a member with pressure ulcers (usually every 2 hours); off-loading of pressure and good glucose control for diabetic ulcers; establishment of adequate circulation for arterial ulcers and the use of a compression system for members with venous ulcers.

   Note: A course of electrical stimulation therapy for chronic cutaneous ulcers would not typically be expected to exceed 60 minutes per day, or a total duration of more than 4 weeks.  Courses of electrical stimulation therapy for chronic cutaneous ulcers exceeding 1 hour per day are not considered medically necessary, as prolonged treatments beyond 1 hour per day have not been proven to offer additional clinically significant benefits.

   Note: Continued electrical stimulation is not considered medically necessary if measurable signs of healing have not been demonstrated within a 4-week treatment period.  Measurable signs of improved healing include a decrease in wound size either in surface area or volume, decrease in amount of exudates and decrease in amount of necrotic tissue.

   Aetna considers continued electrical stimulation not medically necessary once the wound demonstrates a 100 % epithelialized wound bed.

2. Aetna considers electrical stimulation for the treatment of chronic ulcers in the home setting not medically appropriate.

3. Aetna considers electrical stimulation for the prevention of ulcers and pressure sores as experimental and investigational because its effectiveness for this indication has not been established.

See also CPB 0175 - High-Frequency Pulsed Electromagnetic Stimulation and CPB 0244 - Wound Care. 

It is known that living tissues possess electrical potentials that may play a role in the healing process.  Early studies by Wolcott et al (1969) showed that ischemic ulcers healed significantly faster following electrostimulation.  Their observations were supported by the findings of Gault and Gatens (1976), Carley and Wainapel (1985), Kloth and Feedar (1988), Mulder (1991), Griffin et al (1991), as well as Feedar et al (1991).

Cutaneous ulcerations can arise as a consequence of circulatory disturbances such as varicose veins and obliterative arterial disease (commonly associated with diabetics), severe injury from frostbite or burns, or complications in mobility impaired and bedridden patients.  In particular, pressure (decubitus) ulcers are common among patients with spinal cord injury (SCI).  Mawson et al (1988) noted that about 60 % of SCI patients developed pressure ulcers within 30 days after their admittance to the hospital, while Richardson and Meyer (1981) reported a 41 % incidence of pressure ulcers in SCI patients when they were first admitted to a rehabilitation facility.  Such lesions are the primary cause of extended hospitalization, delayed rehabilitation, and hospital re-admission for SCI patients.

For treatment of such lesions, electrostimulation has been demonstrated to be effective although the cellular and biochemical mechanisms for its beneficial effects are still unclear.  From published studies, the duration of this type of electro-therapy was usually 1 hour per day lasting for about 4 weeks.  There were no reports of adverse side effects resulting from electrostimulation.  Additionally, the treated wounds needed less debridement, were without wound infections, and healed with stronger scar tissue when compared with untreated wounds (Carley and Wainapel, 1985).

In a multi-center study, Mulder (1991) compared the healing of open-skin wounds treated with electrical stimulation (ES) with the healing of similar wounds treated with sham stimulation.  A total of 59 patients with 67 wounds were enrolled in the study but results included evaluations from 47 patients with 50 wounds.  The wounds were classified as pressure ulcers, vascular lesions, or surgical wounds.  The size of wounds included for study was between 4 cm2 and 100 cm2.  The 14-week study consisted of a 4-week phase, randomized, double-blinded parallel group comparing the effectiveness and tolerance of electrical and sham stimulation of open-skin wounds.  Patients from either group whose wounds were not completely healed at the end of the first phase were allowed to cross-over to actual treatment (10 weeks of open phase).  Patients were examined at least once-weekly during which wounds were measured and clinical assessment of wound appearance was performed.  Wounds were treated twice-daily for 30 mins with electrical or sham stimulation.  Wound healing was determined by the percentage decrease in initial wound size and by the clinical response to treatment.

After 4 weeks of treatment, treated wounds demonstrated a 56 % reduction in size, while sham-treated wounds showed a 33 % reduction in size.  A good (25 to 74 % of original wound size) or excellent (less than 25 % of original wound size) response was reported for 92.3 % of wounds in the treatment group (n = 26) as compared with 54.1 % of wounds in the control group (n = 24).  After 10 weeks of treatment with ES in the open phase, 96 % of wounds (n = 26) exhibited a good or excellent response.  The author concluded that ES should be considered as an adjunct for the treatment of open wounds.

In another randomized, double-blinded and controlled study, Griffin et al (1991) examined the efficacy of high-voltage pulsed current (HVPC) for healing of pressure ulcerations in SCI patients.  A total of 17 patients with pelvic ulcers were randomly assigned to a HVPC group (n = 8) or a placebo HVPC group (n = 9).  Therapy was administered 1 hour a day for 20 consecutive days.  An intensity of 200 V was employed and the stimulator frequency was set at 100 pulses per second (pps).  Measurements of ulcer surface area were performed prior to, and at days 5, 10, 15 and 20 following treatment.  It was found that lesions in the HVPC group exhibited significantly larger percentage of reductions from their pre-treatment size than those in the placebo group at day 5 (32 versus 14 %), day 15 (66 versus 44 %) and day 20 (80 versus 52 %).  The authors concluded that high-voltage pulsed current, in combination with good nursing care, could expedite the healing of pelvic ulcers in SCI patients.

Feedar et al (1991) compared healing of chronic dermal ulcers treated with pulsed ES with healing of similar lesions treated with sham ES in a randomized, double-blinded, multi-center study.  A total of 47 patients with 50 stage II, III and IV ulcers were randomly assigned to a treatment group (n = 26) or a control group (n = 24).  Ulcers in the treatment group were given 30 mins pulsed ES twice-daily at a frequency of 128 pps and a peak amplitude of 29.2 mA if the ulcers contained necrotic tissue or any drainage that was not sero-sanguinous.  This protocol was continued for 3 days after the wound was debrided or showed sero-sanguinous drainage.  The polarity of the treatment electrode on the ulcer was then altered every 3 days until the wound achieved a stage II classification.  The frequency was then lowered to 64 pps, and the treatment electrode polarity was altered every day until the ulcer was healed.  Wounds in the control group were managed with the same protocol, except they were given sham ES.  After 4 weeks, ulcers in the treatment and control groups were 44 and 67 % of their pre-treatment size, and the weekly healing rates were 14 and 8.25 %, respectively.  Furthermore, 14 of the ulcers in the control group were crossed over to the treatment group after the patients completed 4 weeks of sham ES.  At that time, these lesions were about 89 % of their original size and showed a weekly healing rate of 2.9 %.  In contrast, the same ulcers were 49 % of their size at the time of cross-over and exhibited a weekly healing rate of approximately 13 % after 4 weeks of active ES.  These data indicated that pulsed ES was beneficial in treating stage II, III, and IV chronic dermal ulcers.

In a randomized, double-blind, sham-controlled study, Wood et al (1993) reported that 25 (58 %) stage II and III pressure ulcers treated with pulsed low-intensity direct current healed in 8 weeks, whereas only 1 (3 %) ulcer healed and most ulcers increased in size when they received sham ES.  The Agency for Health Care Policy and Research's Clinical Practice Guideline on “Treatment of Pressure Ulcers” (Bergstrom et al, 1994) also recommended ES as an adjunctive therapy for the treatment of Stage III and IV pressure ulcers that do not respond to conventional therapy.  Baker et al (1997) concluded that ES, given daily with a short pulsed, asymmetric biphasic waveform, was effective for enhancement of healing rates for patients with diabetes and open ulcers.

Vanoncini and colleagues (2010) examined the feasibility of the use of functional electrical stimulation (FES) applied to the lower back muscles for pressure sores prevention in paraplegia.  The hypothesis under study is that FES induces a change in the pressure distribution on the contact area during sitting.  Tests were conducted on a paraplegic subject (T5), sitting on a standard wheelchair and cushion.  Trunk extensors (mainly the erector spinae) were stimulated using surface electrodes placed on the skin.  A pressure mapping system was used to measure the pressure on the sitting surface in 4 situations: (i) no stimulation; (ii) stimulation on one side of the spine only; (iii) stimulation on both sides, at different levels; and (iv) stimulation at the same level on both sides, during pressure-relief maneuvres.  A session of prolonged stimulation was also conducted.  The experimental results showed that the stimulation of the erector spinae on one side of the spine can induce a trunk rotation on the sagittal plane, which causes a change in the pressure distribution.  A decrease of pressure on the side opposite to the stimulation was recorded.  The phenomenon is intensified when different levels of stimulation are applied to the 2 sides, and such change can be sustained for a considerable time (around 5 mins).  The stimulation did not induce changes during pressure-relief maneuvres.  The authors concluded that the stimulation of the trunk extensors can be a useful tool for pressure sores prevention, and can potentially be used in a routine for pressure sores prevention based on periodical weight shifts.

Kim and associates (2010) examined if sensory (sub-motor-threshold) ES may provide a convenient preventive intervention.  A double-blinded, repeated measures study design was used to test the hypothesis that repeated use of sensory surface ES improves tissue health status in individuals with motor paralysis.  A total of 6 adult males with complete SCI were randomly assigned to treatment or control groups.  The treatment group received the ES intervention, while the control group received a control sham intervention.  Repeated tissue health assessments included transcutaneous oxygen tension (T(c)PO(2)), interface pressure mapping, and gluteal computed tomography (CT) studies.  An initial increase in T(c)PO(2) following use of sub-threshold ES was observed but was not sustained at follow-up.  No statistically significant changes before and after treatment were found in regional T(c)PO(2), gluteal muscle area or pressure distribution.  Thus, sub-threshold ES does not appear to have any sustained effects on tissue health status indicative of reduced pressure ulcer risk for individuals with SCI.  This implies that a contractile muscle response is critically important and further that sub-threshold ES is unlikely to prevent pressure ulcers.  The authors concluded that further studies are needed to find solutions for preventing pressure ulcers in high-risk populations.