Cumulative shock energy.

<p>Cumulative shock energy applied on the myocardium during safety margin testing or upper limit of vulnerability testing according to randomization and adjusted to the different energy levels applicable to the devices of different manufacturers.</p><p>Cumulative shock energy.</p

Procedural data.

<p>Procedural data.</p

Secondary endpoint; increase in CK [U/l] (intention-to-treat) for all randomization groups.

<p>CK = Creatinkinase, No Shock = Implantation without ICD testing, ULV = Upper Limit of Vulnerability Testing, VF = Induction of Ventricular Fibrillation (traditional safety margin testing).</p

Patient characteristics.

<p>Patient characteristics.</p

Consort Flow Diagram according to the CONSORT reporting guidelines.

<p>Consort Flow Diagram according to the CONSORT reporting guidelines.</p