Basic Arrhythmia Review Guide
–
Advanced 02-07-2018
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CARDIAC OUTPUT
THE HEART RATE
(HR) is the number of heartbeats in a minute. The stroke volume (SV) refers to the amount of blood
pumped out of the heart with each contraction or beat. This averages about 70 mL with each beat.
CARDIAC OUTPUT
(CO) is the amount of blood pumped by the heart in a minute.
SV x HR = CO
BLOOD SUPPLY TO THE MYOCARDIUM
The right coronary artery supplies oxygenated blood to the right side of the heart. The left coronary artery supplies
oxygenated blood to the left side of the heart.
PROPERTIES OF CARDIAC CELLS
The muscle cells of the heart are unique and responsible for the electrical stimulation that leads to proper mechanical
function. Myocardial cells have several different electrophysiological properties: automaticity, excitability, conductivity,
contractility.
ELECTRICAL CONDUCTION SYSTEM
The components of the cardiac electrical conduction system transmit the electrical impulses initiated by the
SA node
(
the main pacemaker
) through the Atria,
AV node
/
JUNCTIONAL
tissue,
BUNDLE OF HIS
,
RIGHT AND LEFT
BUNDLE BRANCHES
, and
PURKINJE FIBERS
.
AV Node
SA Node
Atrial Tracts
Bundle of HIS
Left Bundle
Branch
Purkinje
Fibers
Right Bundle
Branch
