Echo 1 Chapter 8 VHD Flashcards by Briana Jennings

Q

MS WAVE FORM HAS

A

Increased E wave peak
Flattening of EF slope
Absent A wave

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Q

MS severity is determined by

A

Pressure half time
MV area
Mean PG

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Q

MVA is calculated by

A

P 1/2t method or DT method

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Q

What is pressure halftime

A

The time it takes for the peak gradient to reduce by half

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Q

The greater the pressure half time the greater

A

The more critical the degree of stenosis

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Q

The flatter the MS wave form

A

The more server the stenosis

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Q

MVA= what over PHT

A

MVA= 220/ pressure halftime

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Q

How can we acquire DT

A

From E wave all the way back to the baseline

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Q

Pressure Halftime Equation

A

pressure halftime= DT x 0.29

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Q

What is a normal pressure halftime for MS

A

30-60ms

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Q

What is a normal MVA

A

4-6cm

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Q

What is a mild MS pressure gradient

A

90-150 ms

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Q

What is a Mild MS MVA

A

> 1.5 cm

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Q

LAP =

A

Systolic BP- MR gradient

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Q

Lv pressure overload creates

A

LVH

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Q

What is the Bernoulli equation

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A

4(v)squared

Q

Normal LVOT diameter

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A

1.8-2.2

Q

TVA= what over PHT

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A

190/P halftime

Q

identify the doppler calculation to determine mitral stenosis

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A

PHT

Q

decreased EF slope =

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A

less than 30mm/s

Q

decreased MV excursion =

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A

equal to or less than 15mm

Q

normal PHT MS

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A

30-60

Q

Mild MS PHT

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A

90-150

Q

Moderate MS PHT

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A

150-219

Severe MS PHT

220+

Normal MVA

4-6

Moderate MVA in MS

1-1.5

Mean PG moderate MS

5-10mmHg

Hepatic vein normal range

0.5- 1.1cm

MR velocity normal range

4-6 m/s

EROA =

2x3.14 x PISAr squared x Va / MR max

Mild EROA (MR)

less than 0.20

Severe MR EROA

more than 0.40

A Lvot=

.785 x Dlvot squared

simplified Continuity equation

A lvot x V lvot / V Aov

Mild AS peak velocity