%0 Journal Article
%T Hyperglycemia-Induced T-Wave Oversensing as a Cause of Cardiac Resynchronization Therapy (CRT) Failure
%A Mohammad Assadian Rad
%A Zahra Emkanjoo
%A Hassan Moladoust
%J Journal of Tehran University Heart Center
%D 2012
%I Tehran University of Medical Sciences
%X T-wave oversensing occurs when the counter starts giving dual beeps for every cardiac cycle instead of one. This usually happens when the monitoring lead displays a tall T wave, which is also sharp. R wave sensing algorithms of the devices do not sense T wave because the slow rate of the T wave is much less than that of the R wave. But the slow rate of T waves may change with time and also because of parameters like potassium levels and hyperglycemia. We present a 67-year-old female who underwent the implantation of cardiac resynchronization therapy (cardiac resynchronization and implantable cardioverter defibrilator [CRT-D]) because of severe left ventricular systolic dysfunction and ventricular dyssynchrony experienced recurrent inappropriate implantable cardioverter-defibrillator (ICD) shocks and CRT failure. Device analysis showed that the CRT failure was in consequence of T-wave oversensing due to hyperglycemia. Elimination of the T-wave oversensing after hyperglycemia control conferred good biventricular pacing and good response to CRT during a 6-month follow-up period.
%K Cardiac Resynchronization Therapy
%K Cardiac Pacing
%K Artficial
%K Hyperglycemia
%U http://journals.tums.ac.ir/PdfMed.aspx?pdf_med=/upload_files/pdf/20684.pdf&manuscript_id=20684