tailieunhanh - Profiles in Cardiac Pacing and Electrophysiology - part 7

Rung tâm thất (VF hoặc VFIB) Một nhịp tâm thất, hỗn loạn, rất nhanh chóng với quá trình khử cực vô tổ chức dẫn đến co bóp không hiệu quả, thiếu nhịp tim có hiệu quả, và sự sụp đổ. Nếu không đảo ngược trong vòng vài phút | Part 2 Dictionary of Electrophysiology and Pacing 131 Dessertenne s tachycardia - polymorphically written. Ventricular fibrillation VF or VFIB A chaotic very rapid ventricular rhythm with disorganized depolarization resulting in ineffective contractions lack of an effective heartbeat and collapse. If not reversed within a few minutes irreversible brain damage will result. The most common cause of sudden cardiac death it is amenable to treatment with both external and implantable defibrillators. Ventricular inhibited VVI pacemaker This is a ventricular demand pacemaker system which can pace and sense in the right ventricle VV and which delivers an output pulse after a preset or programmed pacing interval expires. When the patient s intrinsic rhythm exceeds the preset pacing rate or should a premature ventricular contraction occur the pacemaker senses the QRS complex and inhibits the delivery of an output pulse to the ventricle I . Ventricular tachycardia VT is a rapid heart rate that starts in the ventricles. During VT the heart does not have time to fill with enough blood between heartbeats to supply the entire body with sufficient blood. It can be life threatening if it progresses to ventricular fibrillation. Volt The force with which electrical current is driven. Pulse amplitude is stated in volts. It is abbreviated as V. 132 Part 2 Dictionary of Electrophysiology and Pacing Wolff-Parkinson-White WPW syndrome is characterized by a double stimulation of the ventricles. A premature conduction wave via accessory pathways preexcitation stimulates the portions of the ventricles nearest the atrium then the ventricles depolarize as a result of the conduction wave which proceeds normally through the atrioventricular AV node. The clinical significance of this syndrome depends on the appearance of supraventricular reentry tachycardias. Part 3 Historical Pages Hippocrates of Cos 466-377 bc and the Hippocratic oath 135 Marcus Gerbezius 1658-1718 137 Paracelsus 1493-1541 .