Final Exam Dysrhythmia exam with 100% correct answers 2024

First Degree Atrioventricular Heart Block correct answersprolonged PR interval-measures the time required for an impulse to travel from the SA to the AV node. PRI longer than 0.20 Second degree AV block Type I correct answersprogressive prolongation of PRI, gradual shortening of R to R intervals P wave not followed by a QRS wave a pause with an R to R interval less than the sum of two P to P intervals first conducted atrial impulse after the pause shows a shorter or normal PRI Second Degree AV Block Type 2 correct answersRhythm: ventricular irregular; atrial regular Rate: atrial rate > ventricular rate P waves: P waves may not be followed by QRS PRI: WNL or prolonged ; PRI before and after a blocked P waves are constant. QRS duration: WNL; greater than 0.11 sec block occurs below the bundle. characteristics of first degree AV block correct answersrhythm: regular Rate: usually WNL P waves: one positive before each QRS complex PRI: prolonged QRS: normal causes of first degree AV block correct answers- normal in hx of cardiac disease especially athletes - Acute MI - acute mydocarditis or endocarditis - cardiomyopathy - degenerative fibrosis and sclarosis - drugs - hyperkalemia - increased vagal tone - ischemia or injury to the AV node or AV bundle - rheumatic heart disease - valvular heart disease what causes second degree AV block type I correct answersRCA, athletes, aortic valve disease, atrial septal defects, meds, mitral valve prolapse, rheumatic heart disease.