tailieunhanh - Ebook ECG short rapid review for non-Cardiologists (edition 2.1): Part 2

(BQ) Part 2 book "ECG short rapid review for non-Cardiologists" presents the following contents: Ventricular arrythmias, heart blocks, myocardial infarction, junctional arrythmias, premature ventricular contractions, miscellaneous, P&Q wave relationships. | CHAPTER 4 VENTRICULAR ARRYTHMIAS IDIOVENTRICULAR RHYTHM If the ventricle does not receive triggering signals the ventricular myocardium itself becomes the pacemaker escape rhythm . This is called Idioventricular Rhythm. Ventricular signals are transmitted cell-to-cell between cardiomyocytes and not by the conduction system creating wide sometimes bizarre QRS complexes sec Rate 20-40 bpm Rhythm Regular P waves None PR interval None QRS Wide sec . Bizzare type appearance Idioventricular rhythms occur when all of the heart s other pacemakers fail to function or when supraventricular impulses can t reach the ventricles because of a block in the conduction system. Ventricular arrhythmias originate in the ventricles below the bundle of His and fires at the rate of 20-40 bpm . Idioventricular rhytm may also be called as agonal rhythm. If the rate is 40 bpm it is called accelerated idioventricular rhythm. The rate of 20-40 is the 61 Page intrinsic automaticity of the ventricular myocardium. Bizzare appearance The T wave and the QRS complex deflect in opposite directions because of the difference in the action potential during ventricular depolarization and repolarization. P wave is absent because depolarization of atria does not occur. The arrhythmias may accompany third-degree heart block or be caused by anything which damages AV node like infarction or blocks it like digoxin. ACCELETATED IDIOVENTRICULAR RHYTHM Same as Idioventricular rhytm only difference is heart rate. Here it s 40-100 bpm while in IVR it s been 20-40 bpm Rate 40-100 bpm Rhythm Regular P waves None PR interval None QRS Wide 10 sec Bizzare appearance Idioventricular rhythms appear when supraventricular pacing sites are depressed or absent. If the heart rate 62 Page become slow diminished cardiac output is expected. History is helpful for identifying the underlying etiology for AIVR. Most patients with AIVR presents with chest pain or shortness of breath symptoms related to myocardial ischemia .

• Y khoa - Dược
• ECG short rapid review
• Ventricular arrythmias
• Heart blocks
• Myocardial infarction
• Junctional arrythmias
• Premature ventricular contractions
• ECG workout Exercises in arrhythmia interpretation
• Ventricular arrhythmias
• Bundle branch block
• Ventricular fibrillation
• Accelerated idioventricular rhythm
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