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Einthoven's first device. Inventions have continued since the Paleolithic era in which stone tools were invented, and the modern era in which the sewing needle and paint were invented, and inventions continued until our time.

A device prepared by Einthoven was a small device that could be carried beside the patient's bed.




ECG: Electrocardiography

The ECG device is used to record the electrical activity of the human heart, and doctors usually resort to it to help find out the cause of several symptoms such as chest pain and palpitations, before performing any surgery, or as part of the patient’s routine examination procedures, so that it does not cause the patient any sense of pain. The electrocardiogram is a good test, as it can detect many diseases related to the heart .


Einthoven's first device

How true is the statement that Einthoven's first device was a small device that could be carried beside a patient's bed?


  • wrong phrase.

The first device invented by the scientist Einthoven was the electrocardiogram in 1903 AD, as it was a huge, clumsy device, then experiments, improvements, and inventions followed until it became a small device that could be carried and placed next to the patient's bed, as well as ease of use, and Einthoven called this device The name of the cardiologist, and the idea of ​​his work was taken from the galvanometer responsible for measuring the intensity of the electric current.


ECG design

Five main waves “P, Q, R, S, T” appear on the ECG screen when the electric current is flowing, so that each wave indicates a point inside the heart, and the waves are:

  • P wave: It is the first wave that appears from the heart waves, indicating the depolarization caused by the passage of electric current to the right and left atrium.
  • Q wave: It is a very small wave that indicates the depolarization caused by the passage of an electric current across the interventricular septum.
  • R wave: It is one of the most important and highest waves, as it indicates the depolarization of the right and left ventricles as a result of the passage of electric current.
  • S wave: In this wave, the depolarization of cells located on both the right and left walls of the ventricles results from the passage of an electric current in the walls of the ventricles towards the top.
  • T wave: This wave indicates the recovery of the cells that make up both the right and left ventricles.


Types of ECG devices

There are two types of ECG devices, including:

  1. EKG device: or Holter monitor, which is a small device that can be suspended for a day or two so that it records the entire electrocardiogram.
  2. Effort drawing device: through which the electrocardiogram is recorded when doing any physical effort such as sports, walking, and others.


ECG use cases

Some symptoms and conditions that require the use of an ECG machine, include:

  • Chest pain.
  • Feeling of rapid heartbeat and shortness of breath.
  • Knowing about some diseases that may affect the heart.
  • Heart palpitations.
  • Routine cardiac examination.
  • Inability to move with a constant feeling of tiredness and fatigue.
  • Monitor the efficacy of some medications through the device.

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