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The Distribution of Radiofrequency Current and Burns

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

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Medical equipment RF burns show that radiofrequency current of approximately 100 milliamperes per square centimeter can damage skin in about 10 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 measured an average maximum RF current of 175 milliamperes in the ground electrode of an ECG system and found that approximately 100 milliamperes/cm² for approximately 10 seconds can cause skin damage, with burns occurring from equipment malfunctions, improper electrode use, 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.

Figures from the Original Paper

Diagrams extracted from the original research document.

diagramPage 4 - AI-described figure: Figure 1. Schematic of CSV Bovie sentry module.
p. 4 of the original PDF
diagramPage 5 - Figure 2. Diagram of a model used to simulate electrical circuits when the ground wire breaks.
p. 5 of the original PDF
diagramPage 6 - Figure 3. Diagram of circuits used to test for radiofrequency current division in anesthetized dogs undergoing electrosurgery.
p. 6 of the original PDF
diagramPage 7 - Figure 4. System used to measure radiofrequency (RF) power and leakage to ground from electro-surgery units at each control setting.
p. 7 of the original PDF
diagramPage 10 - AI-described figure: Waveforms from a Tektronix oscilloscope showing voltage and current measurements in an electrosurgery setup.
p. 10 of the original PDF
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},
  
  
}
No DOI on file for this study.

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 20-290 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.