Conduction through the heart
Bloodflow through the heart
failure to sense
when the patients pacemaker does not sense the patientts own cardiac rhythm and initiates an electrical impulse. a pace maker spike falls closely to the patients own rhythm, earleer than the programed rate.
loss of capture
occurs when a pacing artifact is not followed by an atrial or a ventricular complex
atrial depolarization, <0.12
is the portion of the EKG wave from the beginning of the P wave ( onset of atrial depolarization) to the beginning of the QRS complex ( onset of ventricular depolarization). It is normally 0.12 - 0.20 seconds.
heart sound, known as lubb; marks the start of the ventricular contraction.
makes the sound dubb; occurs at the beginning of ventricular filling, when the semilunar valves close
S3 and S4
usually very faint and seldom are audible in healthy adults. normal in child. CHF IN ADULTS.
END of Pwave to BEGINNING of QRS (atria contracting, delay of propagation at AV node)
both AV valves (tricuspid and mitral) are closed, aortic valves are open.
both atrioventricular valves are open, and the aortic valves are closed.
a double-layered serous membrane that surrounds the heart
covers and ADHERES closely to outer heart surface.
lines inner surface of pericardial sac.
measured from the Q to the end of the T. represents ventricle depolarization
muscular wall of the heart, forms both atria and ventricles
is the visceral pericardium that covers the outer surface of the heart
inner surfaces of the heart, including those of the heart valves
Chambers of the heart
right atrium, left atrium, right ventricle, left ventricle
pericardium, visceral pericardium, parietal pericardium
receives blood from the systemic circuit and passes it to the right ventricle
pumps blood into the pulmonary circuit
collects blood from the pulmonary circuit and empties it into the left ventricle
pumps blood into the systemic circuit
separates the left atrium from the right atrium
separates the left ventricle from the right ventricle
Right artioventricular valve
known as the tricuspid valve where free edge is attached to connective tissue fibers called chordate tendineae
right coronary artery
follows the coronary sulcus around the heart, supplies blood to the right atrium, portions of both ventricles, and portions of the sa node and the atrioventricular node
left coronary artery
supplies blood to the left ventricle, left atrium, intervetricular septum
how much blood is pumped with each heartbeat`
volume of blood pumped by one ventricle per minute
responsible for pulling the atrioventricular valves closed by means of the chordae tendineae
"heart strings" are tiny white collagenic cords that anchor the cusps to the ventricular walls. They originate from the papillary muscles are only located on TRICUSPID AND MITRAL VALVES.