Exam (elaborations)
6201 Exam 2_ Cardiac Dysrhythmias (1).
- Course
- B260 Infection Control
- Institution
- B260 Infection Control
6201 Exam 2_ Cardiac Dysrhythmias (1).
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6201 Exam 2: Cardiac Dysrhythmiasabnormal cardiac rhythms, prompt assessment of dysrhythmia & patient response to rhythm is
critical - ANS-Dysrhythmias
Time for passage of the electrical impulse through the atrium causing atrial depolarization
(contraction - ANS-P wave
measure from beginning of P wave to beginning of QRS complex.
*time taken for impulse to spread through atria, AV node, & bundle of His; bundle branches &
purkinje fibers to a point immediately preceding ventricular contraction* - ANS-PR interval
3 distinct waves - ANS-QRS complex
First negative (downward) deflection after the P wave, short and narrow, not present in several
leads. - ANS-Q wave
The first positive (upward) deflection in the QRS complex - ANS-R wave
first negative (downward) deflection after R wave - ANS-S wave
the beginning to end of QRS complex
It represents time taken for depolarization (contraction) of both ventricles (systole) - ANS-QRS
interval is measured from.... & represents...
measured from S wave of the WRS complex to beginning of T wave
Represents time between ventricular depolarization & repolarization (diastole) It should be
isoelectric (*flat*) - ANS-ST segment
represents the time for the ventricular repolarization
It should be upright - ANS-T wave
measure from beginning of QRS to end of T wave.
Represents time taken for entire electrical depolarization & repolarization of the ventricles -
ANS-QT interval
consistent & systematic approach - ANS-When assessing a cardiac rhythm, use a ...
, 1. P Wave: Look for presence of P wave-is it upright or inverted? Is there one for every QRS
complex or more than one? Are there atrial fibrillatory or flutter waves present?
2. Atrial rate & rhythm: Evaluate atrial rhythm: regular or irregular? Calculate atrial rate
3. PR interval: measure duration of PR interval. Is it normal or prolonged?
4. Ventricular rate & rhythm: regular or irregular?
5. QRS complex: measure duration, normal or prolonged?
6. ST segment: isoelectric (flat), elevated, or depressed?
7. QT interval: measure duration, normal or prolonged?
8. T wave: upright or inverted? - ANS-Assessment of cardiac rhythm
- ANS-Normal sinus rhythm
SA node fires @ less than 60 bpm
May be normal in athletes or during sleep
Can occur w/ carotid massage, valsalva maneuver, administration of meds (b blockers,
ACE-Inhibitors) - ANS-Sinus bradycardia
Decreased CO
Pale
Cool skin
Hypotension
Weakness
Angina
Dizziness
Syncope
Confusion
SOB - ANS-S/S of bradycardia
atropine
pacemaker
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