About ECG/TMT/PFT
The intracardiac markers indicate that the retrograde P waves, labeled AS for atrial-sensed event, occur 280 milliseconds after the ventricular-paced beats, labeled VP. Telemetered ECG tracing showing atrioventricular (AV)–paced rhythm at 60/min after termination of the pacemaker-mediated tachycardia (PMT).
A pacemaker mediated tachycardia (PMT) may result in ventricular pacing at the Upper Tracking Rate when retrograde P waves (due to the loss of AV synchrony) are sensed and tracked in an atrial tracking mode. PMT Intervention provides an automatic way to detect and interrupt a pacemaker defined PMT.
An ECG is one of the most common heart tests. It is the only way of uncovering certain problems with the heart’s electrical impulses. There are a number of reasons why someone may have an ECG, including an irregular heartbeat, shortness of breath when they exert themselves, significantly high blood pressure, palpitations or a suspected heart valve problem. It can also be a useful way of ruling out problems. If your doctor recommends an ECG, think of it as a basic investigation.
The ECG is a simple test, with 10 electrodes used to record 12 different views of your heart’s electrical activity. You don’t need to do anything to prepare for it. An electrode is attached to each ankle and wrist with sticky pads and six more are attached to the chest. The patient lies almost flat with the head and chest raised a little. Relaxing for a few minutes before the recording is made is important, as this allows the electrode connections to stabilise and means the ECG will be more reliable. During this time, your details can be recorded on the ECG machine.
Depending on the ECG results and the symptoms being experienced, you may need other tests. For example, if your ECG at rest is normal, but you experience chest pain when walking upstairs or uphill, you would probably be given an exercise ECG, which is recorded while you walk on a treadmill.