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Medical Applications Electrocardiogram (ECG). Glossary of Terms. AED Automated External Defibrillator – Auto diagnosis with voice directed treatment. EKG/ECG ElectroCardioGram – skin surface, heart monitor

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glossary of terms
Glossary of Terms
  • AED Automated External Defibrillator – Auto diagnosis with voice directed treatment.
  • EKG/ECG ElectroCardioGram – skin surface, heart monitor
  • Holter Monitor Portable device for continuously monitoring the electrical activity of the heart for at least 24 hours. Can be external or implantable.
  • Defibrillation Delivering a therapeutic dose of electrical energy to the heart.
  • T-wave alterans A change in the shape of the heartbeat signal on an every other beat basis that is not apparent to the naked eye.
  • Right Leg Drive An operational amplifier deriving common mode voltage is used to invert the common-mode signal and drive it back into the patient through the right leg.
  • RFI Radio Frequency Interference
  • ESD Electro Static Discharge
ecg markets
ECG Markets


Professional Healthcare







Home Products


Fitness Equipment

Above Diagnostic



Holter Monitor

ecg waveform characteristics
ECG – Waveform Characteristics
  • ECG Signals have two components:
    • ECG Waveform
      • 0.05 Hz to 150 Hz bandwidth per Medical Standards
      • Average R Wave Amplitude is 1.8mV
      • Some waveforms can be as big as 10 mV p-p.
      • T wave Alterans are only a few microvolts in amplitude
    • Pacing Artifact
      • Medical Standards require 2mV and 200µs detection
      • Average pulse is 1 mV and 500µs but can be much smaller
ecg patient skin surface characteristics
ECG – Patient Skin Surface Characteristics
  • Skin Impedance
    • Standards require of common mode rejection at 51K ohms skin to electrode impedance at 10Hz
    • Good Silver-Silver Chloride electrodes yield about 10 K ohm electrode to skin impedance
    • Stainless Steel electrodes can yield skin impedances of several meg-ohms
  • Defibrillation Voltage
    • 5000 volts, 360 Joules
  • DC Voltage
    • Medical Standards require being capable of acquiring ECG with 300 mV of DC. Mostly due to half cell potential of electrodes, stainless steel can yield 500 mV of DC
  • 60 Hz Noise
    • Average is several mV