Beatrice Lang
Electrical injuries are caused by contact with electrical wiring, devices, or appliances. In the United States, accidental exposure to high voltage results in nearly 400 deaths and over 30,000 non-fatal shock incidents annually. Electrical injuries can cause severe burns and tissue damage, with the severity depending on the voltage, amperage, tissue resistance, and duration of contact. While some researchers are concerned about the potential health effects of EMF exposure from electronic devices, there is no scientific proof that exposure to electromagnetic fields (EMFs) leads to health issues.
| Characteristics | Values |
|---|---|
| Definition | Electrical injury or shock |
| Cause | Contact with energized wiring or devices, or exposure to high voltages |
| Mechanism of injury | Tissue damage due to conversion of electrical energy to heat, resulting in thermal injury |
| Severity | Depends on characteristics of exposure (Kouwenhoven's factors) and electrical field strength |
| Effects | Burns, cardiac arrest, ventricular fibrillation, muscle spasms, dislocated joints, broken bones, nerve damage, cataracts, etc. |
| Treatment | Resuscitation, pain medication, wound management, heart rhythm monitoring, fasciotomy, etc. |
| Prevention | Electrical switches, circuit breakers |
| Annual deaths in the US | Nearly 400 |
| Annual non-fatal incidents in the US | >30,000 |
| Workplace fatalities | 166 in 2019 |
| Workplace injuries | 1,900 in 2019 |
| Household voltage in the US | 110 to 220 volts |
| Types of electrical current | Direct current (DC) and alternating current (AC) |
| EMF exposure | Electric and magnetic fields (EMFs) produced by electronic devices may cause health effects |
| EMF health effects | Possible link to cancer, electromagnetic hypersensitivity (EHS) |
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What You'll Learn
Electrical exposure and poisoning types
Electrical injury or electric shock is damage sustained to the skin or internal organs upon contact with an electric current. The severity of the injury depends on the density of the current, tissue resistance, and duration of contact. High-voltage currents tend to cause deep burns, while low-voltage currents can cause muscle tetany, with a risk of prolonged exposure if the person cannot move away from the source. Electrical injuries can lead to ventricular fibrillation or cardiac arrest and affect thousands of people in the United States each year, resulting in hundreds of fatalities.
Poisoning, on the other hand, refers to the harmful effects of various substances on the body, which can be introduced through ingestion, inhalation, absorption, injection, or contact with the eyes. Poisoning can be caused by natural or man-made substances, including medication, cleaning products, gases, pesticides, food contamination, and venom from bites or stings.
While electrical exposure and poisoning are distinct types of injuries, both can result in serious health consequences and even death.
Types of poisoning include:
- Food poisoning: This occurs when contaminated or undercooked food is consumed, leading to nausea, vomiting, diarrhea, and other gastrointestinal issues.
- Medicine overdose: Poisoning can occur when medication is taken in excess, either accidentally or intentionally. This includes over-the-counter medicines like paracetamol and prescription drugs like antidepressants.
- Gas poisoning: Inhalation of toxic gases like carbon monoxide and carbon dioxide can lead to poisoning. These gases are odorless, colorless, and tasteless, making them particularly dangerous.
- Venom poisoning: Bites or stings from snakes, wasps, and bees can inject venom into the body, causing toxic effects.
- Alcohol poisoning: Excessive consumption of alcohol over a short period can lead to alcohol poisoning.
- Environmental poisoning: Exposure to chemicals and pesticides in household cleaners, laundry detergent, and industrial chemicals can result in poisoning.
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High-voltage vs. low-voltage exposure
Electrical exposure is a kind of poisoning that occurs when a body part comes into contact with electricity, causing a sufficient current to pass through the person's tissues. Tissue damage due to electrical exposure is primarily caused by the conversion of electrical energy to heat, resulting in thermal injury. The severity of an electric shock depends on the density of the current, tissue resistance, and duration of contact.
High-voltage electrical exposure refers to contact with electricity above a certain voltage threshold, typically considered to be above 500 volts. High-voltage exposure can cause deep burns and is more likely to result in severe injury or death due to the higher electrical energy carried by the current. The voltage may also jump" an air gap, allowing for indirect exposure without direct contact. Standard precautions for working with high-voltage equipment include wearing insulating clothing, using insulated tools, and avoiding contact with multiple conductive surfaces simultaneously.
Low-voltage electrical exposure, on the other hand, typically refers to voltages between 110 and 220 volts. While low-voltage exposure may not directly cause burns, it can lead to muscle tetany, which is the prolonged contraction of muscles. This can be dangerous if the affected individual is unable to remove themselves from the source of the current. Low-frequency AC current, commonly found in households, is associated with higher rates of injury and mortality due to the potential for prolonged exposure.
In both high- and low-voltage exposure, the amperage (or current) is a critical factor in determining the severity of the electrical injury. Higher amperage can lead to more severe tissue damage and an increased risk of ventricular fibrillation or cardiac arrest. Additionally, the duration of exposure plays a significant role, with longer exposures causing more extensive damage.
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Tissue damage and internal organ damage
Electrical injuries occur when a body part comes into contact with electricity, causing a current to pass through a person's tissues. The severity of an electrical injury depends on the density of the current, tissue resistance, and duration of contact.
Tissue damage due to electrical exposure is caused by the conversion of electrical energy to heat, resulting in thermal injury. The amount of heat energy dissipated is equal to amperage squared multiplied by resistance and time. Therefore, for any given current and duration, tissues with the highest resistance tend to suffer the most damage. Skin, for example, provides the most body resistance, and its thickness and dryness increase this resistance. However, moist, thin skin has lower resistance, and resistance is even lower for punctured skin or moist mucous membranes.
The path of the electrical current through the body also affects the severity of the shock. Currents through the heart or nervous system are most dangerous. If a live wire is contacted with the head, the nervous system will be damaged. If a live electrical part is contacted with one hand while the other side of the body is grounded, the current may pass across the chest, possibly injuring the heart and lungs. If the current passes through the chest, the person will almost certainly be electrocuted. However, if the current does not pass through the chest area, death may not occur, even though the victim may be severely disfigured.
High-voltage electrical currents tend to cause deep burns, while low-voltage currents tend to cause muscle tetany with a risk of prolonged exposure if the person cannot move their hand or another body part away from the current source. Low-frequency AC causes extended muscle contraction (tetany), which may prevent a person from removing their hand or another body part from the current source. Because of this potential for prolonged exposure, AC is associated with higher injury and mortality rates than either high-frequency AC or DC of the same voltage and amperage. DC exposure is likely to cause a single convulsive contraction, often throwing the person away from the current source.
Internal damage can also occur from electrical shock, as the current travels through the body, damaging internal organs and tissues. Blood vessels, arteries, and veins may burst, cutting off the blood supply and causing painful varicose veins. The heart is a muscle that pumps using electrical pulses, and electrical shock can trigger ventricular fibrillation or cardiac arrest. In addition, electrical injuries may directly damage cardiac myocytes, leading to delayed arrhythmias such as sinus tachycardia or premature ventricular contractions. Electrical injuries may also cause chest wall muscle paralysis and concomitant respiratory arrest.
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Electrical exposure and cardiac arrest
Electrical exposure is a form of poisoning that can lead to cardiac arrest and other serious health issues. Electric injury or electrical shock is caused by direct or indirect contact with an electric current, resulting in damage to the skin or internal organs. The severity of the injury depends on the density of the current, tissue resistance, and duration of contact.
Low-frequency AC (alternating current) electricity, commonly found in households, can cause extended muscle contractions (tetany), preventing individuals from removing themselves from the source of the current. This prolonged exposure contributes to higher rates of injury and mortality compared to high-frequency AC or DC (direct current) of the same voltage and amperage. Low-voltage currents can also lead to muscle tetany, and if an individual cannot remove the affected body part, there is a risk of prolonged exposure.
High-voltage currents, on the other hand, tend to cause deep internal burns due to the large amount of energy they deliver. Voltage exposure injuries are classified as low-voltage injuries (LVI) or high-voltage injuries (HVI), with the latter typically defined as voltages above 500 to 1000 volts. LVI can result in severe injury or cardiac arrest, depending on factors such as length of exposure, size of the individual, and environmental humidity. For example, a low-voltage current passing through the chest for an extended duration can induce ventricular fibrillation, which, if not treated promptly, can lead to cardiac arrest.
The impact of electrical exposure on the heart is complex and not fully understood. However, it is known that electrical injuries can lead to cardiac arrhythmias, ventricular fibrillation, and asystole/pulseless electrical activity, all of which can have life-threatening consequences. The mechanism by which electricity induces cardiac arrhythmias involves changes in sodium-potassium transport and concentrations, resulting in alterations in membrane potential.
Additionally, the presence of medical implants, such as artificial cardiac pacemakers or implantable cardioverter-defibrillators (ICD), introduces another level of vulnerability, as they are sensitive to very small currents. While most researchers believe that the EMFs (electric and magnetic fields) we encounter daily from appliances and power lines are not dangerous, some scientists question the safety of EMF exposure, citing the need for more comprehensive research.
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Electrical exposure in the home
Electricity is a potential hazard that can cause harm and even be fatal. However, if properly managed, the likelihood of harm is minimal. Electrical injuries occur upon contact with an electric current, which can cause damage to the skin or internal organs. While most electrical injuries in the home are minor, high voltage exposure can result in severe injury or death.
In the United States, accidental exposure to high voltage results in nearly 400 deaths and over 30,000 non-fatal shock incidents annually. Electrical burns account for about 5% of admissions to burn units. High-voltage currents tend to cause deep burns, while low-voltage currents can cause muscle tetany, with the risk of prolonged exposure if the person cannot move away from the source. Low-frequency AC, commonly used in households, is associated with higher injury and mortality rates than high-frequency AC or DC due to its potential for prolonged exposure.
Electric and magnetic fields (EMFs) are another concern, produced by power lines, cellphones, microwaves, Wi-Fi routers, computers, and other household appliances. While most researchers believe these EMFs are harmless, some scientists question their safety, particularly regarding long-term, heavy use of mobile phones.
To prevent electrical hazards in the home, it is important to:
- Have electrical inspections performed regularly, especially in older homes with outdated wiring.
- Ensure wiring is compatible with modern appliances and upgrade if necessary.
- Use "tamper-resistant" outlets, which are standard in new homes, to protect children.
- Avoid overloading electrical outlets and power strips to prevent overheating and fires.
- Handle plugs, not cords, when unplugging devices to prevent wire exposure or fraying.
- Be cautious with water, as it conducts electricity and can increase the risk of electric shock.
- Use an ABC-rated fire extinguisher for electrical fires instead of water, which can exacerbate the problem.
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Frequently asked questions
Electrical exposure is not a kind of poisoning. Poisoning is defined as a harmful effect caused by a toxic substance. Electrical exposure is a form of physical injury caused by contact with an electric current.
Electrical injury is damage sustained to the skin or internal organs upon contact with an electric current. The severity of the injury depends on the density of the current, tissue resistance, and duration of contact.
Symptoms of electrical injury can include skin burns, fractures, dislocations, and spinal cord injuries. Cardiac arrest may also occur, even in the absence of burns. In some cases, cataracts can develop days or years after the injury if the current travels close to the eyes.
Risk factors for electrical injury include contact with faulty electrical appliances, machinery, or wiring. Accidental exposure to high voltage is particularly dangerous and can result in serious injuries or death. Workplace accidents account for a significant number of electrical injuries and fatalities.
Treatment for electrical injury depends on the severity of the case. Management may include resuscitation, pain medications, wound care, and cardiac monitoring. In some cases, surgical consultation may be required for tissue damage. All patients should receive a thorough physical examination to assess the full extent of the damage.
