Flashcards in Lecture 07/08: ECG: Enlargement Patterns and Conduction Disturbances Deck (18):
atrial HR counts which wave?
ventricular HR counts which wave?
Normal sinus arrhythmia during respiration is slow during _______ and fast during ________
In wandering pacemaker, tall P waves are caused by________ and short P waves are caused by _______
tall --> higher sympathetic tone
short --> higher vagal tone
notched P wave. Indicative of LA enlargement
Why does LA enlargement result in P mitrale?
LA takes longer to depolarize because its enlarged. Vector to lead II not as strong because pulls electrical activity to the left instead of straight down towards lead
Which wave must always be present in alive animal?
fluid in pericardial sac
clot in pulmonary aa.. Can cause lung thickening
low protein; fluid leaks outside blood vessels which can cause effusion
Causes of low voltage complex (things that dampen electrical signal):
normal variation, obesity, pleural effusion, pericardial effusion, hypothyroidism, pneumothorax, pulmonary thromboembolism, hypoproteinemia
bundle branch block
delay or block of conduction in a bundle branch
which bundle branch is more susceptible to injury?
Why does RBBB cause deep S?
RV must depolarize by cell to cell conduction with vector pointed away from lead II
Causes of 1st degree AV block
AV node disease, elevated vagal tone (most common), drugs, hyperkalemia, hypothermia
Areas in ventricles that will fire unless they are superceeded by a normal beat that comes down and depolarized the ventricles first. Right beneath the bundle of His. Take over to "rescue" the ventricles if AV blocked