23. Diagnostic Features of the ECG Flashcards
____ is a lateral lead.
aVL
Hypokalemia causes ____ on the ECG.
a small, flat T wave that merges with a U wave
Right chest leads?
V1 and V2
Normally the QRS and T waves go in ____ direction.
the same
Normally in V1 and V2, the R wave is ____.
nearly absent
_______ causes a small, flat T wave that merges with a U wave on the ECG.
Hypokalemia
The light lines on the ECG paper = ____ sec.
0.04
How long is a normal QRS interval?
0.06-0.10 sec
Which are the bipolar leads?
limb leads I, II and III
A subendocardial infarct only involves the inner layer of the heart wall and causes ____ on the ECG.
persistent, flat ST depression
How long is a normal P wave?
0.08-0.10 sec
Ischemia due to _____ causes depression of the ST segment.
sudden high O2 demand in the presence of coronary obstruction
If LVH, there should be ____ on the ECG.
large, positive R waves in V5 and V6
ST elevation is a sign of transmural injury in _____.
an acute coronary syndrome or acute MI
What is the length to call a QT interval prolonged?
more than half of the RR interval
Hypokalemia predisposes to ____.
arrhythmia
How long is a normal P-R interval?
0.12-0.20 sec
Lateral leads?
I and aVL
What is the normal K+ concentration in the blood?
about 5 mmol
How long is a normal QT interval?
less than 0.44 sec
Which are the standard limb leads?
I, II, and III