refractory period - answer✔✔per of time where cardiac cells cannot respond to stimulus
absolute refractory period - answer✔✔beginning of qrs to peak of t wave
relative refractory (vulnerable per of repolarization) - answer✔✔- cardiac cells have repolarized
enough to respond to strong stimulus
- during this per a strong stimulus may overtake the pacemaker of the heart
- ex. PVC during vulnerable period may turn into vtach or torsades
- prolonged QT interval inc possibility
causes of prolonged qt intervals - answer✔✔haldol, bradycardia, hypokalemia
atropine for bradycardia dose - answer✔✔- 0.5 mg q3-5min
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