Schubert biographer Brian Newbould describes that outburst: "torrential scales, pulse-threatening rhythms, trills, shock harmonies, writhing chromaticism, fragments of recitative, dramatic silences and stabbed chords".
Such electrical dyssynchony can cause life threatening heart rhythm problems, which means that the electrical properties of the generated cells need to be carefully understood and standardized.
Of the three patients who saw the terrorist attack, one had a life-threatening rhythm abnormality.
In fact, if he were destined never to have a life-threatening rhythm disturbance, then he would never experience the benefits at all.
Boston Scientific and F.D.A. officials said the changes were unrelated to the safety of the devices, which sense when a user's heart is beating erratically and then send an electrical jolt to interrupt that life-threatening rhythm.
"And in some patients we test the defibrillator by causing the heart to go into a life-threatening rhythm, to make sure the defibrillator can recognize it and shock them out of it.
They can also deliver a more significant jolt, likened to a swift kick in the chest, to halt potentially life-threatening rhythm disruptions.
When a beating heart slips into an irregular, life-threatening rhythm, the treatment is well known: deliver a burst of electric current from a pacemaker or defibrillator.
When it detects a potentially life-threatening rhythm (arrhythmia), the ICD will provide one of three possible treatments: Cardioversion: Giving a shock at a specific time during the cardiac cycle to try to convert the arrhythmia to a normal sinus rhythm (NSR).
Fast infusion may lead to cardiac irritation causing life threatening irregular cardiac rhythms.
