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Ventricular paced failure to capture8/20/2023 ![]() ![]() ⇒ increase absolute value of sensitivity (making it harder to inhibit) usually due to settings on the pacemaker.Reduced pacemaker output / output failure may be seen on ECG monitoring if the patient contracts their rectus or pectoral muscles (due to oversensing of muscle activity).Abnormal signals may not be evident on ECG.These inappropriate signals may be large P or T waves, skeletal muscle activity or lead contact problems.produces inappropriate/excessive inhibition of atrial pacing -> confuses pacemaker into thinking that there has been a return to spontaneous atrial activity.Oversensing occurs when electrical signal are inappropriately recognised as native cardiac activity and pacing is inhibited.⇒ decrease absolute value of sensitivity (making it easier to inhibit) ⇒ same mechanisms as failure to capture and pace ![]()
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