Hypothermia

Question 1

Brady arrhythmias

Answer 1

Sinus Bradycardia
AF with slow ventricular response
Slow junctional rhythm
Varying degrees of AV block 1st-3rd

Question 2

Osborn Waves

Answer 2

Positive deflection at J point (negative in V1 & aVR)
Prominent in precordial leads
height proportional to degree of hypothermia

Question 3

QT

Answer 3

QT prolongation marked

Resolves with rewarming

Question 4

Shivering artifact

Answer 4

fuzziness of baseline

DDx: tremor/ parkinsons

Question 5

Other arrhythmias

Answer 5

Ventricular ectopics
cardiac arrest: 
-VF
-VT
-Asystole

Question 6

ECG Changes in Hypothermia

Answer 6

Rate: variable
Rhythm: 
-sinus brady
-AF / flutter
- Nodal rhythm
- AV block
- Premature ventricular contractions
- VF
-Asystole
Wave:
-TWI
Intervals
-Prolonged PR, QRS, QT