CRAT Flashcards
Normal PRI interval
0.12-0.20
Normal QRS interval
0.11 or less
Define intrinsic beats
The patient’s own heartbeat
What is sensing?
The ability for the heart to sense and respond to the electrical activity of the heart
What is capture?
The pacemaker sends a stimulus to the heart which causes the heart to depolarize
What does Failure to sense mean
Lack of pacemaker spikes where they should have been.
Battery can be dead.
Failure to capture (loss of capture)
No P or QRS after the pacemaker spike
What does Undersensing mean
Pacemaker spikes in areas where they should not be (i.e. in the T wave, an ST segment, or on top of another QRS)
What is the Pericardium
Outer protective double-layered sac surrounding the
heart
What is the epicardium
Thin outermost layer of the heart, contains coronary arteries
Myocardium
The middle muscular layer, containing the electrical system
Endocardium
Inner most layer of the heart, lines chambers and valves.
Atrioventricular Valves|diastole]
Valves between the atria and
ventricles, Tricuspid, Bicuspid/Mitral, Regulates blood Now IN the heart.
Atrioventricular Valves (diastole]
Valves between the atria and
ventricles, Tricuspid, Bicuspid/Mitral, Regulates blood Now IN the heart.
Semilunar Valves(systole)
Pulmonary and Aortic valves separates
Ventricles from corresponding artery. Regulates blood flow OUT of the heart.
