CARDIOLOGY

Supraventricular Tachyarrhythmias

Jan 30, 2019 by in CARDIOLOGY Comments Off on Supraventricular Tachyarrhythmias

Supraventricular tachycardia Supraventricular tachycardia (SVT) is a rhythm disturbance with a rate greater than 100 that requires tissue from above the His-Purkinje system to perpetuate. SVT can be regular (e.g.,…

read more

Cardiac Pacing and Pacemaker Rhythms

Jan 30, 2019 by in CARDIOLOGY Comments Off on Cardiac Pacing and Pacemaker Rhythms

Pacemaker rhythms Cardiac pacing systems are described by a three- or four-letter code. The first letter indicates the chamber in which pacing stimuli are delivered (atrium, A; ventricle, V; or…

read more

Implantable Cardioverter Defibrillators

Jan 30, 2019 by in CARDIOLOGY Comments Off on Implantable Cardioverter Defibrillators

Implantable cardioverter defibrillators An implantable cardioverter defibrillator (ICD) is a device that is placed subcutaneously or submuscularly, with leads that are positioned within the heart (or, more recently, subcutaneously). In…

read more

Drug Effects and Electrolyte Disorders

Jan 30, 2019 by in CARDIOLOGY Comments Off on Drug Effects and Electrolyte Disorders

Antiarrhythmic drugs By several mechanisms, some drugs, particularly antiarrhythmic drugs, can cause serious rhythm disturbances in susceptible individuals. This is termed proarrhythmia . Proarrhythmia encompasses an extensive list of arrhythmia…

read more

Ventricular Tachyarrhythmias

Jan 30, 2019 by in CARDIOLOGY Comments Off on Ventricular Tachyarrhythmias

Nonsustained ventricular tachycardia Description Ventricular tachycardia (VT) is defined as three or more consecutive ventricular beats occurring at a rate of 100 beats or more per minute. Nonsustained ventricular tachycardia…

read more

Ectopic Complexes and Rhythms

Jan 30, 2019 by in CARDIOLOGY Comments Off on Ectopic Complexes and Rhythms

Premature atrial complexes Description Premature atrial complexes (PACs) are supraventricular ectopic depolarizations originating in or near the atria or in the pulmonary veins that supersede activation from the sinus node….

read more

Bradyarrhythmias—Conduction System Abnormalities

Jan 30, 2019 by in CARDIOLOGY Comments Off on Bradyarrhythmias—Conduction System Abnormalities

Atrioventricular conduction abnormalities Atrioventricular (AV) block occurs when an atrial impulse either is not conducted to the ventricle or is conducted with delay. This assumes that the impulse occurs at…

read more

Athletes and Arrhythmias

Jan 30, 2019 by in CARDIOLOGY Comments Off on Athletes and Arrhythmias

Athletes with arrhythmias constitute a potentially high-risk group that may need special attention and evaluation in addition to care that might be required for nonathletes, especially if these athletes have…

read more

Management of Arrhythmias in Pregnancy

Jan 30, 2019 by in CARDIOLOGY Comments Off on Management of Arrhythmias in Pregnancy

During pregnancy, preexisting arrhythmias may or may not increase. Hemodynamic changes, particularly during the third trimester, may predispose to some arrhythmias. Palpitations due to higher plasma volumes or ectopy are…

read more

Treatment of Arrhythmias

Jan 30, 2019 by in CARDIOLOGY Comments Off on Treatment of Arrhythmias

Pharmacologic therapy for clinical arrhythmias Antiarrhythmic Agents Adenosine Adenosine is an intravenous (IV) purinergic blocker that inhibits sinus node and atrioventricular (AV) node automaticity and conduction, similar to high parasympathetic…

read more
Premium Wordpress Themes by UFO Themes