Chapter 10 : Sinus Tachycardia Flashcards
In sinus tachycardia the heart rate must be above what?
100 BPM
Maximum heart rate is equal to what minus age?
220
Sinus tachycardia is caused by a predominant effect of the parasympathetic system?
False
Wide QRS complexes are acceptable in sinus tachycardia?
True
Electrical alternans is electrocardiographically represented as a varying (blank) in the QRS complex?
Amplitude or height
The following conditions may lead to electrical alternans.
Tachycardia, Pericardial effusions
The ST segment can be depressed in tachycardias. What are some possible causes?
Atrial repolarization or Tp wave
Relative endocardial ischemia
Actual endocardial ischemia
Buried P waves
Sinus tachycardia has a much shorter phase 4 of the action potential. This is electrocardiographically represented by what segment?
TP segment
Sinus tachycardia should not be considered a pathologic rhythm but merely a physiologic response to autonomic stress?
True
The treatment of sinus tachycardia is to what?
Treat the cause
The differential diagnosis of sinus tachycardia includes what?
Exercise, fever, cocaine, anemia, CHF
It is common for the TP segment to be completely missing on a strip showing sinus tachycardia?
True
In an acute myocardial infarction, the tachycardia may lead to further damage because of the increased oxygen demand placed on the myocardium by the tachycardia. Slowing the heart down by using beta-blocking agents is clinically appropriate.
True
The main therapy in sinus tachycardia that is hemodynamically stable in a patient with a fever is beta blockers?
False
Sinus tachycardias are always benign hemodynamically?
False
