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ECG, TMT, EEG & NCV
ECG

ecgECG (electrocardiogram) is a test that measures the electrical activity of the heart. The heart is a muscular organ that beats in rhythm to pump the blood through the body.

The signals that make the heart's muscle fibres contract come from the sinoatrial node, which is the natural pacemaker of the heart.
In an ECG test, the electrical impulses made while the heart is beating are recorded and usually shown on a piece of paper.

This is known as an electrocardiogram, and records any problems with the heart's rhythm, and the conduction of the heart beat through the heart which may be affected by underlying heart disease.

TMT

TMT MachineIt is a stress test in which the patient walks on a moving treadmill while the heart and breathing rates are monitored.

Treadmill test (TMT) or exercise stress test is one of the commonest forms of stress tests used to induce provokable myocardial ischemia for diagnostic evaluation of coronary artery disease. Other forms of stress test are dobutamine stress echocardiography and adenosine stress test. In treadmill exercise test, the subject walks on a treadmill as per the protocol of the test. One of the commonest protocol used is known as Bruce protocol. Every stage of Bruce protocol consists of three minutes. The starting speed is 1.7 miles per hour (mph) and the gradient is 10%. 0.7-08 mph increment in speed and 2% increment in gradient is given for each consecutive stage. Usual Bruce protocol has upto 7 stages, but most often when it is done in a post myocardial infarction patient, upto 10 minutes of exercise is taken as sufficient.

The heart rate and blood pressure are monitored continuously along with 12 lead ECG with computerised ST and arrhythmia detection algorithms. Test is stopped if the subject develops limiting angina, syncope, breathlessness, fatigue or when the target heart rate is achieved. Significant ST depression of 3 or more millimeters is also an indication for termination. Occasionally the test has to be terminated because of serious cardiac arrhythmia. A defibrillator and qualified personal and equipment for resuscitation should be available during the test.

NERVE CONDUCTION VELOCITY (NCV)

A nerve conduction velocity test (NCV) is an electrical test that is used to determine the adequacy of the conduction of the nerve impulse as it courses down a nerve. This test is used to detect signs of nerve injury. Symptoms which necessitate the test include numbness, tingling, and/or burning sensations. The nerve conduction velocity test can be used to detect true nerve disorders (such as peripheral neuropathy and mononeuritis multiplex) or conditions whereby nerves are affected by mechanical compression injury (such as carpal tunnel syndrome and compression neuropathy). Performed at specialized centres, it requires the expert interpretation of a clinically sound Neurologist

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