Use Instructions
SpiroSphere
®
ECG Instructions for Use
Page 61/136
Version 02.02 • 04AUG2022
Resting ECG
Information on ECG Recording
An electrocardiogram (ECG) is a graphic recording of the changes occurring
in the electrical potentials (millivolt changes) at dened sites on the skin. The
continuously changing electrical elds are the result of depolarization and
polarization of the heart and are distributed in the body without any delay.
The electrical elds are caused by the cardiac cells, which are electrically
polarized.
The ECG is a graphic recording of cardiac electrical activity but is not a
measure for cardiac pumping capacity (muscle strength).
SpiroSphere ECG allows recording of a 12-lead resting ECG measurement.
The Waveform
Willem Einthoven (1860-1927), Professor of Physiology and Winner of the 1924 Nobel Prize,
developed the ECG Standard Leads I, II and III, which are named after their inventor.
Einthoven named the prominent waves alphabetically P, Q, R, S, T and U.
The at amplitudes P, T and U are called waves, Q, R and S are called peaks.
The P-wave represents the wave of depolarization that spreads from the atrium. The Q, R and
S peaks, also referred to as QRS-complex, represent the wave of
depolarization from the ventricle.
The T-wave represents the repolarizations of the ventricle.
The U-wave is undened.