Critical Care Exam 1 Study Guide
Solutions
P wave - ANSWER-Depolarization of the atria
PR interval - ANSWER--Normal is 0.12 to 0.2 seconds
- onset of atrial depolarization until onset of ventricular polarization
QRS complex - ANSWER--Normal is 0.06 to 0.11 seconds
-Ventricular depolarization
...
- may be a normal response from a fever, exercise, anxiety, pain, dehydration. May accompany shock,
LHF, hyperthyroidism, anemia, hypovolemia, PE, MI
-can be caused by caffiene, nicotine, amphetemines, atropine, cocaine.
Sinus Arrhythmia - ANSWER✔✔-Rate: increases on inspiration, decreases on expiration
Rhythm: *Always has irregular rhythm*
P waves?: yes
PR interval: normal
QRS: normal
Significance: usually a normal finding and usually is *not treated*
Premature Atrial Complexes - ANSWER✔✔-Rate: normal
Rhythm:abnormal
P waves?: Yes, has *EARLY* p waves
PR interval? WNL
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