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Transcript
Electrical Conduction of the Heart Electrocardiography • A recording of the electrical activity of the heart •Gold standard for dx of cardiac arrhythmias • Helps detect electrolyte disturbances •detection of conduction abnormalities • Screening tool for heart dz during stress tests • Helpful with non-cardiac dz Watch This Electrocardiogram (ECG/EKG) • Is a recording of electrical activity of heart conducted thru ions in body to surface 13-60 Conduction System of the Heart SA node: sinoatrial node. The pacemaker. Specialized cardiac muscle cells. AV node: atrioventricular node. conducted more slowly here AV bundle Right and left bundle branches: Braches to right and left ventricles Purkinje fibers Normal conduction pathway: SA node -> atrial muscle -> AV node -> bundle of His -> Left and Right Bundle Branches -> Perkinje fibers ->Ventricular muscle EKG EKG EKG Machine Ischemic Heart Disease • Is most commonly due to atherosclerosis in coronary arteries • Ischemia occurs when blood supply to tissue is low • Often accompanied by angina pectoris (chest pain) 13-78 Ischemic Heart Disease • Detectable by changes in S-T segment of ECG • Myocardial infarction (MI) is a heart attack 13-79 Arrhythmias Detected on ECG • Arrhythmias are abnormal heart rhythms • Heart rate <60/min is bradycardia; >100/min is tachycardia 13-80 Arrhythmias Detected on ECG continued • In fibrillation contraction of myocardial cells is uncoordinated & pumping ineffective – Ventricular fibrillation is life-threatening 13-81 FYI • In TV medical dramas, an isoelectric ECG (aka, flatline), is used as a symbol of death or extreme medical peril. • Technically, this is known as asystole, a form of cardiac arrest, with a particularly bad prognosis.