ELECTROCARDIOGRAPHY Flashcards
(40 cards)
He demonstrated the direct contact with the electrical
generator or ground on electrical conductor could lead to a
muscle contraction in a frog leg.
Luigi Aloisio Galvani in 1786
They confirmed that an electrical current accompanies each
heart beat by applying a galvanometer to the base and
apex of an exposed ventricle.
Rudolph von Koelliker and Heinrich Muller in 1856
realizes that
electricity is associated with the heartbeat.
Carlo Matteucci in 1842
analyzes the electric pattern
of frog’s heart.
* He used the electrometer to record the
electrical activity of the exposed frog hear
marey
, credited for the invention of
EKG
* Developed the elegant, reliable and
sensitive string galvanometer. He was able
to record electrical forces of the heart from
the hands and feet of the subject without
even addressing death.
William Einthoven
non-invasive diagnostic test that evaluates your
heart’s electrical system to assess for heart disease.
electrocardiogram or ecg
Converts the heart’s electrical activity into lines called
waveforms
contraction of any muscle is
associated with electrical changes called
depolarization
Einthoven name the wave form produce by hearts electrical
system
P, Q, R, S, T
considered the pacemaker of the heart.
* The conductivity of the heart, normally follows an electrical
pathway
SA node
rapid heart rate
tachycardia
slow heart rate
bradycardia
irregular heart rate
Arrhythmia
REASONS WHY ECG IS DONE
If the patient had heart disease in the past.
* If the patient has a medical condition that predisposes to
heart disease, such as hypertension, diabetes, high
cholesterol, or inflammatory disease.
* If the patient has other significant risk factors for cardiac
disease.
INDICATIONS
heart arrhythmias
Myocardial infarction (heart attack)
Coronary artery disease (CAD)
congenital heart defects (CHD)
Are applied at specific locations on the patient’s chest
wall and extremities to view the heart’s electrical
activity from different angles and planes
electrodes
graph paper used to measure rates of impulse
formation and the duration of the electrical events that
occur in the heart
ecg paper
Each Small box is equal to
0.04 seconds of time
Each large box is equal to
0.20 seconds of time
ECG recorder compares the electrical activity detected in
different electrodes. The electrical picture is called
LEAD
The ECG is made up of 12 characteristic views of the heart
o 6 from limb leads
o 6 from chest leads
Electrode positioned in the 4th intercostal space in
the right sternal border
V1
4th ICS in the left sternal border
V2
Midway between V2 and V4
V3
