Normal ECG Part I and II Flashcards
what is each little square on the ECG?
.04 seconds or 1 mm
what should the PR interval not exceed?
.2 seconds
in what leads is the P wave upright?
1, 2, V4-V6, and AVF
in what leads is everything inverted?
AVR
what doest the P wave represent?
atrial depolarization
narrow/ small Q waves are normal in what leads?
1, AVL, AVF, V5, and V6
what might ST depression be caused from?
subendocardial injury or ischemia
what might ST elevation be caused from?
subepicardial injury or ischemia
in what leads is the T wave upright?
1,2, V3-V6
what is the shape of the T wave?
slightly rounded and asymmetrical; height is not greater than 5 mm
what does QT duration represent?
length of the ventricular systole
what is associated with inverted T waves or tall upright T waves?
ischemic pattern
what does hyperkalemia show up as on an ECG?
tall peaked T waves with a narrow base
what are the precordial leads?
V1-V6 (they are the ones located on the anterior chest wall)
what are the bipolar limb leads?
I, II, and III
what is sinus rhythm evident by?
upright P waves
for axis determination, what leads should you look at?
I and aVF
what should you consider if there are prominent T waves?
you have to consider the clinical circumstances- if there are no cardiac symptoms and they are healthy, then the prominent T waves could be normal
What does a notching of a P wave indicate?
P-mitrale; caused by mitral stenosis
what does a point P wave indicate?
P-pulmonale; caused from underlying pulmonary disease
what could a prolonged PR interval indicate?
an AV block
what could a deeply inverted symmetrical T wave in V3 indicate?
infarction of anterior heart
