NUR 254 Chap 26
- Dysrhythmias
Answer Disorders of formation or conduction (or both) of electrical im- pulses within heart
Can cause disturbances of Rate Rhythm Both rate and rhythm Potentially can alter blood flow and cause hemodynamic changes*** ekg will not tell thiss Diagnosed by analysis of electrographic waveform
- depolarization
Answer electrical stimulation
- repolatization
Answer electrical relaxation
- reload
Answer volume and stretch of the myocardium and end of diastole
- afterload
Answer amnt ot pressure L ventricle must work to open
- systole
Answer ventricular contraction- depolarization
- diastole 1 / 2
Answer ventricle relaxation
- stroke volume
Answer volume of blood pumped with one contraction 60-100ml
- cardiac output
Answer amnt of blood pumped by L ventricle in one minute 4-8L/min
- Normal Electrical Conduction
Answer SA node (sinus node)- AV node
Conduction Bundle of His Right and left bundle branches Purkinje fibers Depolarization = stimulation = systole Repolarization = relaxation = diastole
- SA node
Answer sets hr 60-100 bpm
12. MI
Answer change in the st and t waves
- p wave
- / 2
Answer represents atrial depolarization and sa node impluse through atria- atrial depolarization 2-3mm and 0.11 sec or less