tailieunhanh - Ebook Current diagnosis & treatment cardiology (3rd edition): Part 2

(BQ) Part 2 book "Current diagnosis & treatment cardiology" presents the following contents: Supraventricular tachycardias, atrial fibrillation, conduction disorders & cardiac pacing, ventricular tachycardia, pulmonary embolic disease, sudden cardiac death, pulmonary hypertension, congenital heart disease in adults,. | 233 Supraventricular Tachycardias Byron K. Lee MD Peter R. Kowey MD 20 ESSENTIALS OF DIAGNOSIS k Heart rate greater than 100 bpm. k Rhythm is supraventricular in origin. General Considerations Supraventricular tachycardias SVTs are rapid rhythm disturbances originating from the atria or the atrioventricular AV node. In the absence of a bundle branch block there is intact conduction to the ventricles via the right and left bundles leading to a narrow and normal appearing QRS. Therefore these arrhythmias are also often called narrow complex tachycardias. Since many of the SVTs are episodic many clinicians also refer to this group of arrhythmias as paroxysmal SVTs. Radiofrequency ablation has become an important therapeutic option in the management of SVTs because of its ability to eliminate these arrhythmias safely. Table 20-1 outlines the pharmacologic therapy for SVTs. Pathophysiology Etiology Arrhythmias occur as a result of three main mechanisms reentry which is most common enhanced or abnormal automaticity and triggered activity. Reentrant arrhythmias sustain themselves by repetitively following a revolving pathway comprising two limbs one that takes the impulse away from and one that carries it back to the site of origin. For reentry to exist an area of slow conduction must occur and each limb must have a different refractory period see the discussion on AV nodal reentrant tachycardia . In this situation pacing by inducing refractoriness in one limb of the circuit can typically initiate a reentrant tachycardia. Once established pacing can also terminate the tachycardia by interfering with impulse propagation in one of the limbs. The second mechanism automaticity refers to spontaneous and often repetitive firing from a single focus which may either be ectopic or may originate in the sinus node. It should be noted that automaticity is an intrinsic property of all myocardial cells. This mechanism comprises two subcategories. Enhanced automaticity is defined as a .

• Y khoa - Dược
• Current diagnosis & treatment cardiology
• Supraventricular tachycardias
• Atrial fibrillation
• Pulmonary embolic disease
• Congenital heart disease in adults
• Sudden cardiac death
• Lipid disorders
• Chronic ischemic heart disease
• Cute myocardial infarction
• Cardiogenic shock
• Aortic regurgitation
• Nutrition in Healthy Children
• Growth and Development
• Pediatric Cardiology
• Renal and Cardiovascular
• Pediatric Cardiac Surgery
• Skill and Creativity
• BMC Geriatrics
• Patients over 75 years old
• All cause mortality
• Cardiac death
• Ebook Resuscitate
• How we die suddenly
• A history of resuscitation
• Causes of sudden cardiac death
• A profile of sudden cardiac arrest
• Who will live
• Who will die
• Essentials for clinicians
• Goldberger’s clinical electrocardiography
• Clinical electrocardiography
• Sudden cardiac death syndromes
• Sudden cardiac arrest
• Manual of electrophysiology
• Catheter ablation
• Risk stratification
• Ambulatory electrocardiographic monitoring
• Cardiac resynchronization therapy
• BMC Pulmonary Medicine
• Chronic obstructive pulmonary disease
• Altered cardiac repolarization
• Increased dispersion
• Risk factors
• báo cáo khoa học
• báo cáo y học
• công trình nghiên cứu về y học
• tài liệu về y học
• cách trình bày báo cáo
• báo cáo hóa học
• công trình nghiên cứu về hóa học
• tài liệu về hóa học
• Emotion and the ECG
• ECG at a glance
• Acute coronary syndromes
• Aortic valve disease
• Congenital heart disease
• Pulmonary hypertension
• Pocket protocols for ultrasound
• Cardiovacular disease in special populations
• Specialized testing and therapeutics
• Specialized testing
• The only EKG book you’ll ever need
• Preexcitation syndromes
• Myocardial ischemia and infarction
• Finishing touches
• Putting it all together
• BMC Pediatrics
• Anomalous aortic origin of the left coronary artery
• Subpulmonic intramyocardial course
• medical books
• pharmacology
• epidemiologic
• Obstetrics
• anatomy
• Preventing Morbidity
• Multidisciplinary Care