Ibhre Review 65 Correctly Answered Questions Latest Update

accelerometer {Ans: a piezoelectric crystal attached to the circuit board within the device can 1. rapid response to onset of exercise 2. functionally simple 3. compatible with any pacing lead No direct relationship between detected levels of activity and metabolic demand, susceptible to environmental noise}total atrial refractory period (TARP) {Ans: sum of paced AV delay (PV delay) and atrial refractory period (PVARP) if rate responsive PVARP is *ON* use the shortest in calculations = pacemaker's 2:1 block point}upper limit of vulnerability (ULV) {Ans: weakest shock strength at or above which VF is not induced when the shock is delivered at any time during the vulnerable period (T wave) ULV~DFT strongest shock that induces V, lower limit of invulnerability (minimum shock strength)}five determinants of myocardial performance {Ans: 1. heart rate 2. conduction velocity 3. preload 4. afterload 5. contractility}Chagas Disease {Ans: - most prevalent in Central and South America, spread by vector (insect, hematophagous assassin bug) - results in acute infection of the heart, damaging myocardium - progressive, chronic heart disease - infected myocardium is replaced by scar tissue, resulting in thinning walls of the heart - Class IIa indication for ICD placement}antitachycardia pacing (ATP)