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the best cardiologists in yelahanka new town bangalore Miscellaneous conditions Chamber hypertrophy Left ventricular hypertrophy Although the ECG is reasonably specific, it is not as sensitive as echocardiography in detecting LVH. The LVH voltage alone may be a normal finding in younger subjects, but in adults over 35 years it usually connotes true LVH, especially if corroboratory findings are present ) Unfortunately, LVH with ST/T changes may be impossible to separate from LVH voltage complicated by ST/T changes of different, especially ischaemic, origin . Right ventricular hypertrophy The main criteria for detecting RVH are RAD over +110° and a dominant R wave in V1 (in the absence of its other causes and in the presence of normal-duration QRS) . In congenital heart disease conduction defects often come to obscure the hypertrophy patterns. An atrial (AAI) pacemaker in a patient with anterior myocardial infarction of uncertain age. There is sensing (inhibition) only after some native or paced P waves. The pacemaker captures the atria whenever the latter are not refractory: there is no failure to pace. The middle capture beat is earlier than the other two and has a longer PR interval and aberrant RBBB-type ventricular conduction. This is a pacemaker sensing problem. Reprogramming may enable the pacemaker to sense a smaller atrial amplitude and be inhibited correctly. A DDD pacemaker in trouble: there is no atrial capture and the ventricular complexes are capturing the atria on their own. The retrograde P wave interrupts the T wave and triggers another paced QRS whose retrograde conduction is blocked by the original retrograde P wave. Were it not for this block, an endless loop re-entry (paced) tachycardia would occur. The paced complexes have the typical LBBB/left-axis deviation expected from right ventricular apical pacing. Failure to capture may mean the lead has been displaced or that scarring has developed between the tip of the lead and the myocardium. Sometimes, reprogramming an increase in the output of the pacemaker will fix the problem. a = atrial pacing spike (not followed by a P wave); b = ventricular pacing spike (produced after the atrial spike after a programmed AV delay and followed by a paced ventricular beat); c = retrograde P wave following ventricular paced beat; d = pause caused by blocked retrograde conduction of the previo A DDD or VDD pacemaker with intermittent failure to pace. A 4:3 pacemakerventricular block results in trigeminy even though normal sinus rhythm continues throughout. The normal