Circulation Lab Flashcards
P-R interval
< or = to .20seconds
(0.08-0.20)
QRS complex
< or = 0.12seconds
QT interval
normal (< 0.47)
lengthening of the QT interval. Possible therapies include treating hypokalemia with magnesium sulfate, giving beta blockers, and pacing the heart to decrease the action potential duration.
Torsades Pointes
QRS countoff
300, 150, 100, 75, 60, 50
Elective or emergency procedure in which electrical current is delivered to heart muscle in order to terminate potentially dangerous dysrhythmias. (i.e. atrial fibrillation, ventricular tachycardia, supraventricular tachycardia).
Utilized when drug therapy unsuccessful.
cardioversion/defibrillation
- Set machine to “sync” mode [Shock timed to be delivered on R-wave when myocardial cells are refractory - to prevent ventricular dysrhythmias]
cardioversion
criteria for cardiac monitoring:
- unstable angina (r/o MI)
- MI – hemodynamically unstable
- dysrhythmias – hemodynamically unstable
- dysrhythmias – for initiation of anti-dysrhythmic agents
- pre/post coronary intervention
- major stroke
- acute medical illness w/ heart disease
- moderate CHF
- post-op surgery w/ angina, ST changes, ischemia, hypotension, etc.
- respiratory failure
- drug overdose/toxicity
- syncope w/ CHF or dysrhythmia
- status epilepticus
taken from the start of the P wave to the start of the QRS complex
PR interval
taken from the start of the QRS complex to the end of the T wave. This represents the time taken to depolarize and re-polarize the ventricles.
QT interval
the period between the end of the QRS complex and the start of the T wave. All cells are normally depolarized during this phase.
ST segment
decrease BP
ARB -sartan (triglycerides)
ACE -pril (COUGH)
decrease HR
Beta blockers -lols (tachycardia)
Calcium Chanel Blockers Virapamil, Dilatezem (A. fib)
Anticoagulant
-arin (prevent clots)
Warfarin, Heparin, Lovenox
Antiplatelet
aspirin, plavix, effient (prophylaxis TIA & MIA)
