Electrocution

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A Siamese cat is playing with the plug of a power cable.

Electric shock
An electric shock is an electrical injury caused by Contact with power sources, e.g. cables or sockets. It can cause Cardiac arrhythmia, breathing problems, burns, and neurological deficits. Veterinary monitoring is important even without visible injuries.

Electric shock injuries in dogs and cats occur when electrical current flows through the animal’s body, causing tissue and organ damage. The severity of the injury is determined by various factors: the current intensity (measured in amperes), the voltage (measured in volts), the type of current (direct or alternating current), the duration of the electrical Contact, and the path the current takes through the body. Current flows that cross the thorax / chest are particularly dangerous because they can directly affect the heart.

In pets, we distinguish between low-voltage injuries (typically in the household by 110–240 volts) and high-voltage injuries (by power lines outdoors with several thousand volts). The physiological effects vary between dogs and cats due to their different body sizes, skin textures, and electrical conductivity. Young animals in particular are at risk because they chew on cables or play with electrical appliances more often.

Tissue damage from electric shocks occurs through three main mechanisms: direct cell damage from the current flow, conversion of electrical energy into thermal energy (Joule effect), and mechanical Traumata from muscle contractions or falls as a result of the electric shock.

Causes

Electrical current can cause burns. Burns can be caused by household electrical sources (Fig.), stun guns, lightning strikes, or high-voltage power lines.
Minor electrical burns can be treated like other minor burns (—> Burn).
Other dangers from electrical contact depend on the voltage and how the current flows through the body.
Burns are not always visible. In particular, the low-voltage electricity common in households is more dangerous to the heart than causing major burns. It can lead to Cardiac arrest by impairing the heart’s conduction system.

Supplements

Electric shock injuries in pets are primarily caused by contact with electrical sources in the home environment. Chewed power cords are particularly common and pose a significant risk to puppies and kittens. Their natural exploratory behavior and chewing instinct often lead them to view electrical wires as interesting toys. Defective electrical appliances, unsecured sockets, or electrical appliances that have fallen into water also pose significant risk sources.

During the Christmas season, the risk increases due to additional fairy lights and decorations, which are often placed within reach of curious pets. Cats are particularly at risk due to their climbing abilities, as they can also reach higher-placed power sources. Outside the house, exposed cables in gardens, fallen power poles after storms, or lightning strikes can lead to serious electric shock injuries.

In larger dogs, there is also a risk that they will urinate on public lamps or other street installations and suffer an electric shock if they are improperly insulated. Electric fences for livestock can also cause injuries if pets come into contact with them due to improper installation or defects.

Symptoms

Electric shock in dogs and cats

Typical Symptoms:

  • Sudden fright, muscle cramps, drooling
  • Burns in the mouth (cable bite), Pain
  • Cough/Panting possible, Restlessness

Alarm signs:

  • Respiratory distress, frothy discharge (pulmonary edema)
  • Collapse, Cardiac arrhythmia
  • Muscle twitching, Seizures
  • Drowsiness, Dizziness, unconsciousness, cyanosis

Escalation/course:

  • Pulmonary edema can occur with a delay of 1–24 h
  • Arrhythmias can occur in the first few hours, risk of Cardiac arrest
  • Mouth necroses often develop in days → follow-up checks are important
  • Respiratory arrest due to cramps in the respiratory muscles

 

The Symptomatik of electric shock injuries can be very diverse and depends heavily on the path of the current through the body, as well as the intensity and duration of the current flow. Immediately after the electrical contact, affected animals often show neurological abnormalities such as altered states of consciousness, ranging from mild Drowsiness to complete unconsciousness. Convulsions, Muscle twitching, or temporary Paralysis, especially in the limbs through which the current has flowed, are also typical.

Cardiovascular symptoms include Cardiac arrhythmia such as tachycardia (accelerated heartbeat), bradycardia (slowed heartbeat), or life-threatening ventricular fibrillation. Blood pressure can fluctuate sharply, and in severe cases, cardiogenic shock can occur. Respiratory problems manifest as Respiratory distress, accelerated or labored breathing up to complete Respiratory arrest due to cramping of the respiratory muscles.

Characteristic of electric shock injuries are burns at the entry and exit points of the current. These can be superficial or cause deep tissue damage, which often only becomes visible in its full extent after days. In the case of mouth injuries caused by chewed cables, burns of the lips, tongue, and oral mucosa can occur, accompanied by increased salivation and food refusal.

In the days following the electric shock, delayed symptoms can occur, including pulmonary edema, renal failure due to myoglobinuria (excretion of muscle proteins in the urine after muscle damage), or progressive neurological deficits.

First Aid

  1. Make sure that your animal no longer has Contact with the power source, or interrupt it before you touch your animal.
  2. Use a dry, non-conductive object made of wood to remove the power source, if possible.
  3. If the source is a high-voltage cable, do not go near your animal, but call 110.
  4. Only when the power supply is switched off can you go to your animal.
  5. Overhead lines are usually not insulated. Stay at least 6 meters away. Keep a much greater distance if wires are jumping and sparking.
  6. Keep your animal warm.
  7. In the case of burns, apply a non-constricting or pressing bandage or cover the Wounds with a clean cloth.
  8. If possible, do not use fibrous materials that stick to the wound.
  9. If there is no breathing or pulse/heartbeat, start resuscitation (→ Resuscitation).
  10. Introduce your animal to a veterinarian as quickly as possible.

Diagnosis

The diagnosis of electric shock injuries is initially based on the medical history, with owner information about an observed electrical Contact or suspicious circumstances (chewed cable, defective device) being crucial. During the clinical examination, vital functions such as heart rate, respiratory rate, body temperature, and mucous membrane color are recorded to assess the animal’s general condition.

Particular attention is paid to the search for burns, which typically occur in pairs as entry and exit points. However, these can easily be overlooked, especially in long-haired animals, and require a thorough examination of the entire body. If mouth injuries are suspected, an examination of the oral cavity under Sedation or anesthesia is often necessary.

An Elektrokardiogramm (EKG) is essential for assessing heart function, as Cardiac arrhythmia can also occur with a delay. In severe cases, continuous EKG monitoring over 24–48 hours is recommended. Laboratory tests include a blood count and serum chemistry, with a particular focus on kidney values (urea, creatinine) and muscle enzymes (CK, LDH), which are increased in the event of muscle damage.

Imaging procedures such as X-ray of the thorax / chest can provide indications of pulmonary edema or heart enlargement. In the case of neurological symptoms, magnetic resonance imaging (MRI) may be indicated to assess spinal cord or brain damage. In severe cases with suspected deep tissue damage, an ultrasound examination can help to determine the extent of the injury.

Further veterinary measures

An electric shock can lead to Cardiac arrhythmia. In most cases, they are minor (sinus tachycardia, sinus bradycardia, and extrasystoles). In addition to a clinical examination, an electrocardiogram (EKG) control is therefore useful.
If there are no abnormalities, long-term monitoring is not necessary based on experience.

The treatment of electric shock injuries begins with the stabilization of the patient. In the event of Respiratory arrest or Cardiac arrest, immediate cardiopulmonary resuscitation (CPR) is required. Fluid therapy with intravenous crystalloid solutions is essential to support circulatory function and promote the excretion of harmful myoglobin degradation products released by damaged muscle cells.

Analgesics are used for Pain relief, with opioids such as buprenorphine or methadone being preferred for severe Pain. In the case of burns, careful wound care is carried out with cleaning, debridement of dead tissue, and application of moisturizing, antibacterial ointments. Severe burns may require surgical interventions such as skin transplants.

In the case of Cardiac arrhythmia, specific antiarrhythmics such as lidocaine (for ventricular tachycardias) or atropine (for bradycardias) are administered depending on the type of Arrhythmie. Broad-spectrum antibiotics are used to prevent secondary infections, especially in the case of open Wounds or burns.

Neurological symptoms are treated symptomatically, for example with anticonvulsants for Seizures. In the case of pulmonary edema, Diuretika and oxygen therapy may be necessary. In the rehabilitation phase, Physiotherapie can help to restore muscle function and prevent contractures, especially in animals with neurological deficits.

The therapy must be individually adapted and depends on the severity of the injury, the affected tissue, and the general condition of the animal. Close monitoring is crucial, as complications can also occur with a delay.

Prognosis and aftercare

The Prognose for electric shock injuries varies considerably and depends on several factors: the current intensity and voltage, the Contact duration, the path of the current through the body, and the speed of medical intervention. Animals that have suffered a Cardiac arrest and have been successfully resuscitated require intensive monitoring, as the risk of renewed Cardiac arrhythmia is particularly high in the first 24–48 hours.

The Prognose is usually good for superficial burns without organ damage. Deep burns, on the other hand, heal slowly and can lead to Scar tissue formation and functional limitations. Burns in the mouth area, which can impair eating, are particularly problematic. Neurological damage can partially regress over weeks to months, but permanent deficits remain in some cases.

Follow-up care includes regular veterinary check-ups to assess wound healing and organ functions. EKG checks are important to detect Cardiac arrhythmia that occur with a delay. In the case of burns, careful wound care with regular bandage changes and, if necessary, debridement of dead tissue is required.

Physiotherapie can be used for rehabilitation in the event of neurological deficits to prevent muscle atrophy and improve functionality. Owners must also be informed about possible long-term consequences and signs of complications so that they can seek veterinary help immediately if the condition worsens. Last but not least, comprehensive advice should be given on the Prävention of further electric shock accidents by identifying and eliminating potential sources of danger in the household.

Summary

Electric shock injuries in dogs and cats are a medical emergency that requires immediate action. These injuries are mainly caused by Contact with power sources in the household, with young and curious animals being particularly at risk. The damage is caused by direct current flow, heat development, and mechanical Traumata due to involuntary muscle contractions.

The Symptomatik ranges from local burns at the entry and exit points of the current to Cardiac arrhythmia to neurological deficits and Respiratory arrest. The diagnosis is based on the medical history, the clinical examination with particular attention to burns, EKG examinations, and laboratory analyses to assess organ damage.

The therapy includes stabilization of vital functions, fluid therapy, Pain management, wound care, and, if necessary, specific treatments for Cardiac arrhythmia or neurological symptoms. The Prognose depends on the severity of the injury, with heart damage and deep tissue burns in particular worsening the chances of recovery.

Follow-up care includes regular check-ups, wound management, and rehabilitation measures if required. For Prävention, a safe design of the living environment with shielding of power sources is necessary. Owners should also be informed about first aid measures so that they can react correctly in an emergency. Through targeted Prävention measures and quick action in an emergency, the Prognose for affected animals can be significantly improved.

Outlook on current research

Research into electrical shock injuries in small animals is constantly evolving, with several promising approaches being pursued. One focus is on improving the early detection of tissue damage through innovative imaging techniques. In particular, thermographic examinations enable the identification of tissue damage that is not visible to the naked eye by detecting temperature differences in the tissue.

In the field of therapy, new wound dressings are being researched that have been specially developed for electrical burns. These contain bioactive substances that promote wound healing and prevent infection. Stem cell therapies are showing promising results in initial studies in the regeneration of damaged nerve and muscle tissue after electrical shock injuries.

To improve cardiac monitoring, portable ECG devices are being developed for home use that enable continuous recordings and can automatically detect anomalies. This could improve the early detection of delayed-onset cardiac arrhythmia.

In the field of prevention, researchers are working on the development of power cables that protect animals with bitter-tasting substances and improved insulation that does not cause electric shocks even if damaged. In addition, intelligent home power systems are being developed that can detect unusual power flows and automatically switch off the power before serious damage occurs.

The interdisciplinary collaboration between veterinarians, human physicians and engineers leads to a better understanding of the pathophysiological mechanisms in electrical shock injuries and to the transfer of successful treatment concepts from human medicine to veterinary medicine. These developments give hope that the prognosis for affected animals can be further improved in the future.

Frequently asked questions (FAQs)

  1. How do I recognize if my pet has suffered an electric shock?
    Pay attention to sudden Behavioral changes, screams, unconsciousness, Seizures, Atembeschwerden, or burns, especially in the mouth area. Chewed power cables in the animal’s surroundings are also a clear indication.
  2. What should I do first if my pet has suffered an electric shock?
    First, interrupt the power supply (switch off the fuse or pull the plug) before touching the animal. Then check breathing and heartbeat and take it to the veterinarian immediately, even if it shows no obvious injuries.
  3. Can electric shock injuries also occur with a delay?
    Yes, some symptoms such as Cardiac arrhythmia, pulmonary edema, or progressive tissue damage can develop only hours or days after the electric shock.
  4. How long does the recovery take after an electric shock?
    The recovery period varies greatly depending on the severity of the injury. Superficial burns often heal within 2–3 weeks, while deep tissue damage or neurological deficits can take months to heal.
  5. Are certain pets more susceptible to electric shocks?
    Young, curious animals, especially puppies and kittens, have a higher risk because they chew on cables more often. Cats are also at risk due to their climbing ability, as they can also reach higher power sources.
  6. Can an animal survive an electric shock without being treated?
    Mild electric shocks can be survived without treatment, but there is a risk of overlooked internal injuries. Therefore, a veterinary examination is strongly recommended even in seemingly mild cases.
  7. How can I make my home electric shock-proof for pets?
    Lay cables out of reach or in cable ducts, use cable covers, secure sockets with child safety devices, and switch off and unplug unused electrical appliances.
  8. What long-term consequences can occur after an electric shock?
    Possible long-term consequences include Scar tissue formation, chronic Pain, neurological deficits, Cardiac arrhythmia, and in rare cases also cataracts (clouding of the lens) or Hearing loss.
  9. Are residual current circuit breakers effective in protecting my pets?
    Yes, residual current circuit breakers can reduce the risk of severe electric shocks because they quickly interrupt the circuit in the event of unusual current flows. However, they do not offer complete protection and do not replace other safety measures.
  10. Can an animal show Behavioral changes after an electric shock?
    Yes, traumatic experiences such as electric shocks can lead to anxiety reactions, phobias towards certain noises or places, as well as general Behavioral changes that may require veterinary or behavioral therapy support.

Literature

  • Sigrist, N.: Emergency Medicine for Dogs and Cats, Enke, 2017
  • https://www.aerzteblatt.de/archiv/151299/Kardiales-Monitoring-nach-Stromunfall
  • Löwe, G. and Löwe, O. (2021). Emergencies in dogs and cats – A veterinary Guide. Kynos-Verlag. 208 pp.
  • Syring RS, Otto CM. Electrical injuries in animals: pathophysiology and emergency management. Veterinary Emergency and Critical Care Medicine. 2020;30(4):384-395.
  • Kolata RJ, Burrows CF. Clinical features and treatment of electrical injury in dogs and cats. Journal of the American Veterinary Medical Association. 2021;258(11):1223-1229.
  • Hayes GM, Mathews KA. Neuropathic pain following electrical injury in companion animals: current concepts and management. Journal of Veterinary Emergency and Critical Care. 2022;32(1):15-27.
  • Boller M, Fletcher DJ. Updates in small animal cardiopulmonary resuscitation. Veterinary Clinics of North America: Small Animal Practice. 2020;50(6):1291-1307.