Shock Therapies Flashcards

1
Q

Which shock therapies are non-committed in MDT ICD’s?

A

Initial VF detection and all cardioversions.

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2
Q

What has to happen for a non-committed shock to be aborted (confirmation)?

A

“Four to abort.” There is a refractory window following charge completion that terminates with the next v sense. If the next four intervals are slower than the TDI, therapy will abort.

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3
Q

How does Confirmation + work?

A

Confirmation + looks for four out of five slow intervals after the delivery of ATP or after charging is complete. Unlike Confirmation, Confirmation + looks for intervals that are within 60ms of the detected arrhythmia.

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4
Q

When is a committed defib shock delivered following charge completion?

A

There is a 900 ms sync interval and if there is no R wave to sync the shock with, the charge is delivered without syncing.

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5
Q

How long and when is the confirmation/arrhythmic window for Confirmation (no +)?

A

Longest programmed detection window enabled plus 60 ms. Two intervals less than the this interval/window will cause therapy delivery.

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6
Q

What additional criteria is applied to Confirmation + under certain circumstances?

A

If the rhythm is detected in the VF zone and is polymorphic, the confirmation interval is FDI + 60 ms.

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7
Q

How are the shock pathways labeled in MDT ICD’s?

A

Can = A, SVC = X, RV = B

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8
Q

What is the nominal shock pathway?

A

B>AX (B to AX)

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