Dual-Chamber and VVI Implantable Defibrillator. A multicenter study comparing dual-chamber (DDDR) implantable cardioverter-defibrillator (ICD) therapy with single-chamber (VVI) ICD therapy in patients with low ejection fractions (40%) and standard ICD indications.
Art is a diverse range of human activities in creating visual, auditory or performing artifacts (artworks), expressing the author's imaginative or technical skill, intended to be appreciated for their beauty or emotional power.
A passive activity is any activity involving a trade or business in which the. taxpayer does not materially participate. Material participation is defined as regular continuous and substantial. activity rendered on behalf of the trade or business. Real Estate and rental. activities are generally, per-se, passive.