ECG III cont. Flashcards
What may induce currents into the electrode lead wires that cause them to heat and cause thermal injuries to patients?
RF electromagnetic radiation
How do you prevent thermal burns to patient from electrodes? (2)
- Make sure there are no loops of electrode wires.
- Keep them close to one another
–because induced current is proportional to the area of loop formed by the wire.
What does this picture depict?
electrocautery interference
What does this picture depict?
slow electrode displacement
Damaged myocytes appear depolarized all of the time. True or false?
True
Current flows between injured (_____ polarity tissue) and ______ normal tissue.
negative
positive
Ischemia cause inversion of t wave due to altered repolarization.
Where is the J point?
What is depression of the J point?
0.5 mV
The most commonly used parameter for measuring the ST segment is ___ ms post J point.
60 ms
What are causes of ST segment elevation?
MI
Acute pericarditis
Benign early repolarization
Left vent. hypertrophy
BBB
Cardiomyopathy
Acute myocarditis
cardiomyopathy
aneurysm
What are electrolyte causes for ST segment elevation?
hyperkalemia
hypercalcemia
Hyperthermia causes ST segment elevation. True or false?
false
Hypothermia does.
Acute abdominal disorder and CNS events can cause ST segment elevation. True or false?
true
High frequency QRS detection of ischemia is known as ____ zone.
RAZ
reduced-amplitude zone
