Strain

Question 1

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

Answer 1

low velocity

high amplitude

Question 2

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

Answer 2

high velocity

low amplitude

Question 3

what happens to E’ velocity in diastolic dysfxn?

Answer 3

decreases

Question 4

is TDI influenced by angle and loading conditions?

Answer 4

yes

Question 5

strain = ?

Answer 5

∆L/Lo

Lo = original length

Question 6

strain rate = ?

Answer 6

∆deformation/∆time

Question 7

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

Answer 7

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

Question 8

describe the meaning of the “cherry on top” picture

Answer 8

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

Question 9

what strain pattern suggests HCM?

Answer 9

peak stain AFTER AV closure

Question 10

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

Answer 10

Preserved- circumferential

Lost- longitudinal and radial

Question 11

what is a normal strain number?

Answer 11

-20% or more negative

Question 12

typical range of myocardial tissue velocity

Answer 12

1-20 cm/s

Question 13

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

Answer 13

2D: lower frame rates, angle independent