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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z T tachycardia - (pronounced tack-ee-car-dee-ah). A category of heart rhythm disorders characterized by an abnormally rapid or irregular heart rhythm. Known causes of tachyarrhythmias include coronary artery disease, heart attack and heart muscle disease.   telephone monitoring - This process allows pacemaker patients to transmit electrocardiogram (ECG), pictures of their heart's activity, to a clinic using a telephone transmitter. The transmitter converts the patient's pulse and pacemaker data into a signal that is transmitted over the telephone lines to a monitoring technician's office. The signal is recorded by an ECG receiver. A clinician analyzes the ECG reading and forwards this information to the patient's physician. A physician will write a prescription for the frequency of the telephone monitoring and to choose a service (company) or pacemaker clinic to perform the service. A transmitter device will be provided to the patient by the service or clinic.   test probe - Instrument intended for use in surgery to test disc movement test stimulation for InterStim Therapy - A temporary procedure in which a test stimulation lead ( a thin wire) is placed near the sacral nerve and connected to an external stimulation device. During test stimulation, a voiding diary is used to record changes in bladder control symptoms to help determine whether long-term InterStim Therapy would be beneficial.   test stimulation lead for InterStim Therapy - A thin wire with an electrode at its tip that delivers electrical stimulation to the sacral nerve.   test stimulator for InterStim Therapy - A battery-powered device (about the size of a pager), usually worn at the beltline, that sends mild electrical pulses to the sacral nerve.   thalamic stimulation - See Tremor Control Therapy. thoracotomy - An operation in which the thorax (chest) is open. threshold check - A testing of the pacing and sensing thresholds of a pacemaker. The pacing threshold is the minimum amount of energy (or battery power) needed to make the heart beat consistently. Determining the pacing threshold is important to ensure consistent pacing and to maximize the pacemaker's battery life. Checking the sensing threshold ensures that the pacemaker can detect (see) the natural electrical activity of the heart. Determining the sensing threshold is important to make sure that the pacemaker only paces the heart when needed.   thromboembolism - Blockage or occlusion of a vessel caused by a blood clot in the blood stream. tissue stabilization - Technology that holds still a small portion of the beating heart so that the surgeon can perform delicate surgery on it.   translucent polysulfone - Medical grade plastic. transvalvular pressure gradient - The differential pressure across a valve. transvenous - Through the vein. tremor - A rhythmic, shaking movement of part of the body produced by involuntary muscle contractions. It may occur in any part of the body and is often in the limbs, head, or voice. Tremor is the only symptom of a neurological disorder called Essential Tremor, and is a common symptom in Parkinson's disease.   Tremor Control System - An implanted system used in Tremor Control Therapy. The system includes a lead, extension, and Implantable Pulse Generator (IPG).   Tremor Control Therapy - A reversible therapy that uses small electrical pulses to disrupt brain signals that cause tremor. It involves implanting a thin, insulated wire (lead) with electrodes in the thalamus of the brain, which is why the therapy is sometimes called thalamic stimulation. The lead is connected to an Implantable Pulse Generator (IPG) which has a battery and electronics. All parts of the system are implanted beneath the skin. The stimulation can be increased or decreased as needed. By adjusting the stimulation, each person can receive the most desirable amount of tremor control with the fewest side effects. The therapy is reversible because the system can be turned off or removed. Side effects are generally mild and can normally be controlled by adjusting the stimulation. Some people experience a tingling sensation called paresthesia. Others may occasionally feel some dizziness or have some slurring of speech. tricuspid valve - Valve between the right atrium and the right ventricle.   trigone - Triangular anatomical structures near the commissures of the mitral valvewhich mark the nondilating seqment of the mitral valve annulus.