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Learning about the heart and performing EKG

Andrea McPherson

on 26 April 2011

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Transcript of Electrocardiography

Electrocardiography What's an EKG all about? A visual of heart activity
for diagnostic purposes. Medical Assistant's role:
knowledge of heart
knowledge of EKG record
knowledge of procedure
machine maintenance Why do we need that?
MI ischemia detection
MI damage
med effects
electrolyte imbalance Heart Anatomy
here we go! First, there are two
different physiologies
to understand. The physical words
The electrical words The heart is a muscle.
Electricity makes the
muscle move. The heart is divided into
side to side and top to
bottom like a plus sign. The right side of the heart
has the job of sending blood to the lungs. The left side of the heart
has the job of sending
blood to your system. Pulmonary Circulation Systemic Circulation Atria - top two chambers
Ventricles - bottom to chambers Four valves create the four chambers and keep blood in its place. The four valves are:
mitral (bicuspid)
aortic Now for some electrical work! SA Node: natural pacemaker, atrial depolarization
Bachman's Bundle: left atrium conduction
AV Node: located in right atrium
Bundle of His: conductor to ventricles
Left/Right bundles branch: along septum
Purkinje Fibers: ventricular depolarization Components of the
Electrical System Depolarization/Repolarization
Systole/Diastole - physical One cardiac cycle takes
0.8 sec
AMAZING!! The movement of the heart
contracting and relaxing is recorded
on a piece of paper with an EKG. Let's start with the machine Electro - electricity
Cardio - heart
Graph - record The machine only recieves
electrical information, it does
not transmit any electricity Electrodes are connected to
the patient.
Leads are connected to the
electrodes and the wire harness.
The wire harness is connected to
the machine. Electricity put off by the heart
is picked up on the surface of
the skin by the electrodes. It all comes from that
cool electrical system
hidden inside the heart! All of this electrical info
is analyzed by the EKG
machine and printed out
on paper in squiggly lines.
EKG Language The paper is running out of
the machine at 25mm/sec Time = horizontal
Voltage = vertical l large box - 5mm up
and 5mm across
l small box - l mm Cardiologist heart rate calculation formula
300 div by # of boxes from R to R = H/R What does R to R mean? EKG language is created
from a series of letters of
our alphabet. Each letter represents something
special happening with the electrical
system of the heart. The squiggly lines on the EKG paper
are called a tracing. The stylus traces
along the paper leaving a black line
like a lie detector test. Before we go too far let's
learn about the engine
of our circulatory system. Knowing the anatomy of the
heart helps you understand
what you see on the EKG tracing. The Heart
engine of system
transport blood
female - 9 oz
male - 10.5 oz Learning to perform a
proper EKG can mean
the difference in heart
health for every patient.
Full transcript