医学英语心脏__培训课件.pptVIP

Coronary artery circulation Pulse Pulse – pressure wave of blood Monitored at “pressure points” where pulse is easily palpated Measuring Arterial Blood Pressure Cardiovascular Diseases Cardiovascular diseases include those that affect the heart and those that affect the peripheral vascular system. The heart and blood vessels may be primarily attacked by these diseases or they may be secondarily affected as a consequence of another disease. Risk Factors for Cardiovascular Disease(sdosp) Smoking Diabetes Obesity Stress Physical Inactivity High Blood Pressure [140 (systolic) / 90 (diastolic)] Cardiovascular Diseases Coronary Artery Disease (CAD) Endocarditis Pericarditis Rheumatic Heart Disease Hypertension Cardiac Arrhythmia Congestive Heart Failure (CHF) Stroke Arteriosclerosis Aneurysm * * * * * * * * * * The SA node sends out a stimulus, which cause the atria to contract. When this stimulus reaches the AV node, it signals the ventricles to contract. Impulses pass down the two branches of the atrioventricular bundle to the Purkinje fibers, and thereafter the ventricles contract. * A normal ECG (top) indicates that the heart is functioning properly. The P wave occurs just prior to atrial contraction; the QRS complex occurs just prior to ventricular contraction; and the T wave occurs when the ventricles are recovering from contraction. Ventricular fibrillation (bottom) produces an irregular electrocardiogram due to irregular stimulation of the ventricles. Ventricular fibrillation is of special interest because it can be caused by an injury or drug overdose. It is the most common cause of sudden cardiac death in a seemingly healthy person over age 35. Once the ventricles are fibrillating, they have to be defibrillated by applying a strong electrical current for a short period of time. Then the SA node may be able to reestablish a coordinated beat. * * * * * * * * SUMC 2011-2012 Student’s copy The cardiovascular system What is the circulatory system? What does the