V1: This chest lead registers potentials from the atria, part of the septum and the right ventricle anterior wall.

V1: This chest lead registers potentials from the atria, part of the septum and the right ventricle anterior wall.

An electrocardiogram was taken at a derivation of d1 - d2 - d3.

V1: This chest lead registers potentials from the atria, part of the septum and the right ventricle anterior wall.

V1: This chest lead registers potentials from the atria, part of the septum and the right ventricle anterior wall.

Base points of the ECG are extracted and processed to ditect a trend occurrence in the ECG.

A lead-retention assembly removably retains a lead within the lead anchor.

The sleeve lumen receives the lead when the lead is received by the lead lumen.

The bypass branch is provided with a bypass valve (21a).

A shunt current sensor is coupled to the shunt device and adapted to detect the shunt current flowing through the shunt device.

A derivation action execution unit executes the derivation action on the basis of the derivation action request if the derivation action has been determined to be allowed.

The force required to separate the limb lead connector from the limb lead connection site is greater than the force required to separate the precordial lead connector from the precordial lead connection site.

A bypass tubing is disposed within the bypass chamber (112).

An annular bypass valve is disposed in the bypass passage.

An annular bypass valve is disposed in the bypass passage.