<http://schema.org/description>
"QRS duration (QRSd) is one of several measures of heart function recorded during a routine electrocardiogram (ECG). It is a composite of waves showing the length of time it takes for an electrical signal to get all the way through the pumping chambers of the heart. Prolonged QRSd is a sign of an abnormal electrical system of the heart and is often found when the heart isn't pumping efficiently."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2009-08-regular-electrocardiograms-physicians-patients-sudden.html>