0.12-.20 sec represents the time of impulse transmission from the SA node to the AV node
T wave
0.16 seconds repolarization of cardiac fiber if elevated the heart is not resting
signs/symptoms of tension pneumothorax
severe respiratory distress, tracheal deviation to the unaffected side, cyanosis, muffled heart sounds, and possibly cardiac arrest
n
P wave
1st positive deflection lasts .06 to .11 sec
QT
.34 to .43 seconds represents entire cardiac cycle
QRS Interval
.04 to .12 seconds depolarization of ventricles
Tension pneumothorax
air accumulating in the pleural space increases to a dangerous level, causing a mediastinal shift that pushes the heart, great vessels,trachea, and lungs toward the unaffected side.
