Mock Exam 1 CCT: 100% Correct |Question and Answers| # Latest Release

Mock Exam 1 CCT: 100% Correct |Question and Answers| # Latest Release What is a vector in the heart? *Ans* The purpose of electrocardiographic investigation is to find out something about the heart itself by means of an accurate knowledge of its electric action. This may be repre- sented by the so-called heart-vector, a directed quantity, indicating in which direction elec- tricity is propagated by the heart. Left Axis Deviation (LAD) *Ans* 30-90 degrees Right Axis Deviation (RAD) *Ans* +90 to +180 normal axis *Ans* -30 to +90 Extreme Axis Deviation *Ans* -90, 180 normal axis qrs in v1 & v2 *Ans* pos / pos (thumbs up / thumbs up) LAD qrs in v1 & v2 *Ans* pos / neg (thumb up / thumb down) RAD qrs in v1 & AvF *Ans* neg / pos (thumb down / thumb up) North West Axis (extreme) qrs in v1 & avF *Ans* neg / neg (thumb down / thumb down) two parts of left bb *Ans* left anterior fascicle & Left posterior fascicle right ventricular hypertrophy signs + right axis deviation = *Ans* likelihood of right axis deviation LVH on an ecg *Ans* sum of S wave in v1 + v2 and the R wave in v5 or v6 is greater than or equal to >35mm if pt has LVH (s wave + R wave = >35mm), and pt has RAD (neg/ pos) + *Ans* Biventricular Hypertrophy deflection of a impulse toward a lead *Ans* positive deflection of an impulse moving away from lead *Ans* negative deflection of an impulse moving 90 deg to a lead *Ans* same pos/neg deflection (equiphasic) easy 7 steps to finding axis on ecg *Ans* 1. find the most equiphasic limb lead 2. look at lead running 90 deg to this 3. impulse mainly +Ve? axis is towards this lead 4. impulse mainly -Ve? axis is away from this lead 5. truly equiphasic? yes- you found cardiac axis 6. slightly more +Ve ; move axis 15 deg towards equiphasic lead 7. Slightly more -Ve? Move axis 15 deg away from equiphasic lead right ventricular hypertrophy (causes) *Ans* -pulmonary hypertension -mitral stenosis -pulmonary embolism -chronic lung disease -congenital heart disease