What is electrotherapy?
Electrotherapy is the use of electricity for therapeutic purposes. It is applied through electrodes that are placed on the body at the point we want to treat. It always starts at a low volume and gradually increases.
What are the types of electrical stimulation?
There are many types of electrical stimulation. The most commonly used ones are Transcutaneous Electrical Neuromuscular Stimulation (TENS), Interferential Current (IFC), High-Voltage Galvanic Current (HVGC), Neuromuscular Electrical Stimulation (NMES) and Iontophoresis.
Electrotherapy: TENS (Transcutaneous Electrical Nerve Stimulation)
TENS currents are a method of electrical stimulation that aims to reduce pain. The way it works to reduce pain is by modifying the painful stimulus someone receives in the spinal cord. It is based on the well-known theory of “pain gate” control, according to which an unpleasant or painful stimulus can be modified when it reaches the spinal cord from one point of the body through the various nerves scattered throughout our body, thus reducing the intensity of pain. The electrodes are placed in the area of the spine which is neurally connected to the area where the patient is in pain.
Electrotherapy: High-Voltage Galvanic Current
There are several main areas of use of these currents. The two main ones are for wound healing and pain management. In addition, there are applications that have been advocated (and researched to a limited extent) for edema management and muscle strengthening. Each is briefly summarized below with links to key research and references.
Wound healing
This topic has been explored quite well (along with many other electrical stimulation options) and has been reviewed in Watson (2008) and Kloth (2005).
A test on the effects of high frequency currents was reported by Kloth and Feedar (1988). A group of 16 patients with stage IV decubitus ulcers were recruited for the trial and all had lesions unresponsive to previous treatment. Patients were randomly assigned to a treatment group (n=59) or sham treatment (n=57). Protocols were given for one 45-minute session per day for 5 days per week.
All patients in the treatment group achieved complete healing of their ulcers (on average for 7.3 weeks with a mean healing rate of 44.8% per week). Patients in the control group fared less well, with an increase in average wound size of nearly 29% between the first and last treatment. A subgroup of patients who were in the control group went on to complete a course of current therapy after the main trial. The three patients achieved complete healing of their ulcers in 8.3 weeks with an average healing rate of 38% per week.
Goldman et al (2002) aimed to evaluate the ability of high-voltage pulsed current (HVPC) to increase microcirculation in critical ischemic wounds and, as a result, improve wound healing. Diabetic patients presented with ischemic lesions of the arsenic oil and serial measurements were made of wound parameters, including oxygen tension. The results showed that the use of electrical stimulation with these patients objectively improved tissue oxygenation and improved the expected wound healing profile.
Electrotherapy: Interferential Current
It is a type of electrotherapy that delivers low-frequency electrical pulses through the skin to nerves located on the surface of the body. These pulses “block” the transmission of harmful signals to the brain. Interfering current stimulation also enhances cellular repair to promote the body’s natural healing process.
What are the benefits of electrical stimulation?
Intermittent current stimulation relieves pain and increases local circulation while reducing inflammation and swelling. It can also contract small groups of muscle fibers to improve the health of muscle tissue.
Cross-current stimulation offers pain relief for a variety of conditions, including some arthritis, back pain, sciatica, back or neck pain.
Is interferon electrical stimulation safe?
Interfering current stimulation has been used safely to treat pain for many years. It is suitable for most patients, but if you are pregnant or have a pacemaker, you may not be allowed to use them.
Electrotherapy: Neuromuscular Electrical Stimulation
Neuromuscular Electrical Stimulation using electrical impulses causes the muscle to contract. These impulses mimic the action potential originating from the central nervous system and thus cause contraction. Electrodes are placed on the skin near the muscles we want and cause rhythmic contractions.
They replace and strengthen the way muscles contract and are used in cases where there is muscle weakness due to surgery, paralysis of the muscle due to damage to a nerve, or any other form of weakness.
Electrotherapy: Iontophoresis
Iontophoresis is a method where medicinal substances are placed on electrodes and by applying a constant direct electric current they are introduced into the tissues located deeper through the skin.