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Flashcards in Strain Deck (13)
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1
Q

what type of VELOCITY and AMPLITUDE are TDI doppler shifts from myocardium?

A

low velocity

high amplitude

2
Q

what type of velocity and amplitude are TDI doppler shifts for blood (as opposed to myocardium)?

A

high velocity

low amplitude

3
Q

what happens to E’ velocity in diastolic dysfxn?

A

decreases

4
Q

is TDI influenced by angle and loading conditions?

A

yes

5
Q

strain = ?

A

∆L/Lo

Lo = original length

6
Q

strain rate = ?

A

∆deformation/∆time

7
Q

strain: if the longitudinal length goes from 10 to 8mm, what is the strain?

A

∆L/Lo = (10-8)/10= 2/10=1/5= -20% (negative b/c shortening; elongating is +)

8
Q

describe the meaning of the “cherry on top” picture

A

strain imaging in AMYLOIDOSIS signifying SPARED apex and significant dysfxn everywhere else

9
Q

what strain pattern suggests HCM?

A

peak stain AFTER AV closure

10
Q

what type of strain patterns are preserved in Diastolic CHF? What is lost?

A

Preserved- circumferential

Lost- longitudinal and radial

11
Q

what is a normal strain number?

A

-20% or more negative

12
Q

typical range of myocardial tissue velocity

A

1-20 cm/s

13
Q

Compared to TDI, 2D imaging has: higher/lower frame rates? is angle dependent/independent

A

2D: lower frame rates, angle independent