CCDS Exam Review Questions with Correct Answers
What are some of the effects of Hyperkalemia? - Answer Increased stimulation threshold (notable increase if K>=7)
Wide QRS
Latency
undersensing
Peaked T-waves
What is the "made easy" formula for calculating
Estimated Battery Service Li...
What are some of the effects of Hyperkalemia? - Answer ✔ Increased stimulation
threshold (notable increase if K>=7)
Wide QRS
Latency
undersensing
Peaked T-waves
What is the "made easy" formula for calculating
Estimated Battery Service Life? - Answer ✔ 114 x (Ampere hour capacity / Current drain
in MicroAmps)
Formula for determining Wenckebach window: - Answer ✔ MTR - TARP
TARP = AVD + PVARP
Formula for determining 2:1 Block Point: - Answer ✔ 60,000 / TARP
What type of lead is least prone to Anodal stimulation if used for extended bipolar LV-
pacing? - Answer ✔ Integrated tachy lead.
The HUGE surface area of the coil diminishes current density to minimum, making
anodal stim much more difficult.
The term virtual electrode or fibrous capsule surrounding the electrode: - Answer ✔ a: is
a normal foreign body reaction
b: is an inexcitable capsule of tissue
c: decreases the current density at the lead tissue interface
ALL ARE TRUE
The potential for proarrhythmic effects of polymorphic VT in a small subset of BiV-paced
patients has been attributed to what? - Answer ✔ Transmural dispersion of
repolarization, leading to prolonged QT
This has been show to be especially true with epicardial LV-pacing, due to the current
going against the natural endocardial-to-epicardial activation sequence.
, ________ represents the maximal rate of change of the electrical potential between the
sensing electrode; and is the first derivative of the ECG. - Answer ✔ Slew Rate (dV / dt)
_________________ describes the isovolumetric time from electrical depolarization of
the heart to mechanical systole. - Answer ✔ Evoked Response Interval
_______ is the basic unit of capacitance. - Answer ✔ Farad
The Wedensky effect may be greatest, reaching clinical significance, when threshold
testing at ____________. - Answer ✔ Short pulse widths
With more and more features, Pacemakers needed a battery chemistry with higher peak
power than Li/I2. What is the chemistry composition of most pacemakers today? -
Answer ✔ Lithium Silver Vanadium Oxide
And
Lithium Carbon Monofluoride
What is the common battery chemistry of ICDs today? - Answer ✔ Lithium Manganese
Dioxide
_______________ is a test typically performed during moderate exercise with HR ~105-
110bpm, and was shown to have Negative predictive value in MADIT II and SCD-HeFT
type patients. - Answer ✔ Microvolt T-wave Alternans
- The test looks for the presence of repolarization alternans (T-wave alternans), which is
variation in the vector and amplitude of the T wave component of the EKG.
- Microvolt T wave alternans is defined as an alternation in the morphology of the T
wave in an every other beat or AB-AB pattern. It has long been associated with
ventricular arrhythmias and sudden death
- Often used on pts who have suffered an MI or other myocardial injury.
The manner in which a heart responds following a PVC (basically how it speeds up and
increases contractility to make up for the loss in stroke volume due to a premature
contraction) is known as _________; the absence of ________ is a predictor of cardiac
mortality. - Answer ✔ Heart rate turbulence
Heart rate and contractility are observed for 10-20 beats following a PVC.
At what point does threshold begin to rise in tined leads? - Answer ✔ 2-3 days
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Scholarsstudyguide. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
