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The Distribution of Radiofrequency Current and Burns

Bioeffects Seen

Becker CM, Malhotra IV, Hedley-Whyte J · 1973

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Medical equipment RF burns show that radiofrequency current as low as 100 milliamperes can damage skin in seconds.

Plain English Summary

Summary written for general audiences

This 1973 medical study examined nine patients who suffered burns during electrosurgery procedures due to radiofrequency current flowing through electrocardiogram (ECG) monitoring electrodes. Researchers found that RF currents averaging 175 milliamperes could cause skin damage, with burns occurring from equipment malfunctions, improper electrode placement, and current leakage through monitoring cables.

Why This Matters

This early research reveals a critical safety issue that extends beyond the operating room. The study demonstrates that radiofrequency currents as low as 100 milliamperes per square centimeter can cause tissue damage in just 10 seconds. What makes this particularly relevant today is that modern wireless devices operate on similar RF principles, though at much lower power levels. The research shows how RF energy can take unexpected pathways through the body, with current flow being 10 times higher when ECG electrodes were placed on the upper arm versus the calf. This illustrates a fundamental principle about RF exposure that applies to all sources: proximity and current pathways matter enormously. While your smartphone operates at much lower power than electrosurgical equipment, the underlying physics of how RF energy interacts with human tissue remains the same.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Becker CM, Malhotra IV, Hedley-Whyte J (1973). The Distribution of Radiofrequency Current and Burns.
Show BibTeX
@article{the_distribution_of_radiofrequency_current_and_burns_g6549,
  author = {Becker CM and Malhotra IV and Hedley-Whyte J},
  title = {The Distribution of Radiofrequency Current and Burns},
  year = {1973},
  
  
}

Quick Questions About This Study

The study found that approximately 100 milliamperes per square centimeter of radiofrequency current for about 10 seconds could cause skin damage. The average maximum current measured in ECG ground electrodes was 175 milliamperes, with a range of 50-390 milliamperes.
Current flow through ECG electrodes was ten times greater when placed on the upper arm compared to the calf, even with the same ground plate position. This demonstrates that electrode proximity to the RF source and current pathway through the body significantly affects exposure levels.
Six main causes were identified: broken ground wires, defective silicon-controlled rectifiers, design faults between different manufacturers' equipment, improper electrode use, capacitive coupling in ECG cables, and radiofrequency current division through monitoring systems rather than intended pathways.
Yes, the researchers noted that radiofrequency induction devices (chokes) may prevent these burns. These components can block unwanted RF current flow through monitoring cables and electrodes, reducing the risk of current taking unintended pathways through the patient's body.
The study found that skin damage could occur in approximately 10 seconds when exposed to about 100 milliamperes per square centimeter of radiofrequency current. This relatively short timeframe demonstrates how quickly RF energy can cause biological effects when current density reaches certain thresholds.