Electrocardiograph Flashcards
What is an EKG?
recording of the electrical activity of the heart
True or False: do most EKGs involve a 12 lead placement?
true
What do depolarization and repolarization ccause the atria and ventricles to do
contract and relax, respectively
What happens in depolarization?
all cells become positive
What happens in repolarization?
cells go from a positive state to a negative state
What happens in hyperpolarization?
allows heart to reset and rest
What is normal heart rate between?
60-100 bpm
What is the heart rate of a parosxysmal tachycardia?
150-200 bpm
What is the heart rate of a flutter?
200-350 bpm
What is the heart rate of a fibrillation?
350-450 bpm
What is a paroxysmal tachycardia casued by?
an irritable focus or node can cause a sudden increase in heart rate
What is a flutter caused by? What does an atrial and ventricular flutter look like?
- an irritable focus or node can casue a sudden increase in heart rate
- atrial: sawtooth
- ventricular: smooth up and down
What is a fibrillation caused/described by? What do the atrial and ventricular fibrillations look like?
- rapid, irregular, adn unsynchronised contraction of the heart muscle fibres
- atrial: no pattern vs atrial flutter. Large rise with several small inbetween
- ventricular: absolutely no pattern once so ever
What is a conduction block? How much communication? What does it look like?
along the pathway of electrical innervation, the conduction is blocked, causing miscommunication betweent eh atria and the ventricules
- varying degrees (some communication to no communication)
- One rise with stright line in betwen and two small atrial beats along straight line
ps. should always be atrial contraction before ventricular wave and the atrial and ventricular waves are not close to each other
