Effect of heart rate and pacing mode on QRS fragmentation.

Background: The study was designed to investigate the effect of heart rate and pacing mode on QRS fragmentation (f-QRS). Moreover, the usefulness of f-QRS in distinguishing patients with impaired left ventricular ejection function (EF) and ventricular tachycardia (VT) from patients with normal EF was assessed.

Methods: Three hundred and six recipients, with dual-chamber device, with intrinsic narrow or wide QRS complex and preserved atrioventricular conduction were grouped into normal-EF or impaired-EF VT.

The effect of nasal steroid administration on intraocular pressure.

The effect of systemic steroid administration on intraocular pressure (IOP) is well established. However less attention has been paid to the effect of steroids when administered in a nasal spray. We conducted a study to investigate a possible association between nasal steroids and elevated IOP in 54 patients who were being treated for allergic rhinitis.