CRM intro Flashcards
(16 cards)
Role of PPM
Sense
Pace
What does a pacemaker contain
Battery (lithium - iodine)
Capacitor
Telemetry coil
Connector to leads
What do pacemaker leads comprise of
Electrodes
Conductor
Insulation
Connector
Fixation mechanism
What does threshold in ppm mean
Min energy required to create a contraction
What is capture in ppm
PPM output causes depolarisation and results in cardiac contraction
What does the first letter of pacemaker code represent
Chamber paced
What does the second letter of pacemaker code represent
Chamber sensed
What does the third letter of pacemaker code represent
Mode of response
Options for mode of response (third letter pacemaker code)
T trigger
I inhibit
D dual (TandI)
O none
What does it mean if R is on the end of PPM code
Rate, person can exercise and PPM will appropriately increase HR
What is cardiac resync therapy CRT
Typically used in HF
Three leads (RA, RV, LV)
Ensures synchronous contraction-useful in dyskinetic contractions
How to place LV lead in CRT
Through coronary sinus into the great vein at the back of the LV
How to an ICD restore rhythm
Newer devices attempt ATP before delivering a shock of ATP is unsuccessful
What is PBL STOP
Presenting rhythm rate
Battery status
Lead status
Sensing
Threshold
Observation, data and events
Programme and print
How does EP study work
Wires into the hearts chambers that sense electrical activity to find abnormal cells which can be ablated to prevent arrhythmias
Wiggers diagram pressure explained
When pressure of chamber exceeds pressure of the the next chamber valves open
E.g when LA pressure exceeds LV pressure mitral valve opens, when LV pressure higher than LA pressure mitral valve closes
