R on T?
V fib
Hypercalcemia
QT intervals shorter
Hypocalcemia
QT intervals prolonged
ST segments prolonged
Hyperkalemia
T waves tall
As increase–>QRS widen
P waves flatten
Hypokalemia
- T waves flatten, merge w/ U
- U waves increase
- QRS widen
- ST segments become depressed
- Prolonged QT
Brugada
RBBB
ST elevation V123
Wellens syndrome
T-wave inversion - V23
Little/no ST elevation
Long QT interval
MORE THAN HALF DISTANCE OF R-R
> 0.44 sec calculated
Pulmonary Embolus
- Lead 1 = Large S
- Lead 3 = Large Q (w/ T-wave inversion)
*HR over 100
S1 Q3 T3(invert)
Most common PE finding
Tachycardia
Wolff-Parkinson-White
- congenital, abnormal electrical pathway from atria to ventricles (Bundle of Kent)
- leads to periods of Tac (v-tac too)
*QRS wide (>0.12) w/ delta (dali) waves
Sinus block
- 60-100
- irregular
- p waves present
- PR interval normal
- QRS normal
NORMAL R-R rhythm after break
Sinus arrest
*60-100
*Rhythm: Irregular
(RESTART DOESN’T FOLLOW R-R rhythm)
*P-R Interval: 0.12-0.20 sec
*QRS complex = normal
Wandering Atrial pacemaker
- Rate : normal
- Rhythm: Irregular
- P waves: present
- PR interval : normal
- QRS complex: normal
P WAVE IRREGLAR ON SAME STRIP => VENTRICLE BEAT IRREGULAR
Digitalis
*PR prolonged >0.20
*t wave flattened, inverted, biphasic
*QT interval: short
ST DIPS
Toxicity: dysrhythmias
Sensitivity
Pacer shouldn’t fire during normal beat
Failure to sense
Pacer fires at wrong time, not sensing normal beat and firing
(Possible R on T)
Oversensing
Misinterprets artifact for normal beat, doesn’t fire when needed
Loss of capture
Spike followed by no P or QRS
