Hemodynamics Flashcards by Steven Sorci

Q

Definition of flow

A

Area x Volume

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Q

Definition of volume

A

Area x VTI

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Q

Definition of pressure

A

modified Bernoulli: 4v²

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Q

PHT equation from DT

A

0.29 x DT

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Q

MVA by PHT

A

220/PHT

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Q

PVR Equation

A

TR_vel/RVOT_VTI x 10

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Q

Flow Equation

A

6.28 x r² x Vel_alias/MR_vel

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Q

Normal LVOT diameter

A

2.1-2.4 cm

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Q

Normal LVOT area

A

3.46-4.5 cm²

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Q

Normal LVOT velocity

A

0.9-1.1 m/sec

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Q

Normal LVOT VTI

A

18-24 cm

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Q

What is a normal E’?

A

Greater than 7

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Q

Diastolic Grades by E/E’

A

Normal: Grade 1
>15: Grade 2
>>>15: Grade 3

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Q

What is an L wave

A

Mid diastolic flow shows elevated filling

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Q

How does DT predict PCWP?

A

Mitral DT < 120ms predicts PCWP > 20

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Q

How does E/e’ predict PCWP

A

E/e’ > 11 predicts PCWP >15

Q

What E/Vp predicts LV filling?

A

E/Vp > 1.4 predicts LV filling > 15

Q

RV and TVI relationship?

A

RV=VTI

Q

Relate ERO, Flow, and RV

A

ERO = Flow (from aliasing equation)/RV (or VTI)