aortic stenosis kunjan bhatt md austin heart. lets start off with some questions!

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Aortic Stenosis Kunjan Bhatt MD Austin Heart

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Page 1: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Aortic Stenosis

Kunjan Bhatt MDAustin Heart

Page 2: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Let’s Start off with some questions!

Page 3: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 1

Components for the continuity equation for AVA include all the following except?

1.MV annular diameter2.MV annular VTI3.AV VTI4.LVOT diameter5.All can be used in the continuity equation for the

aortic valve

Page 4: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 2

Which of the following is not a marker of severe aortic stenosis?1. Vmax across the Aortic valve is > 4m/s2. Calculated aortic valve area of 1.34 cm23. LVOT Vmx / AV Vmx ratio < 0.254. Mean gradient = 55 mmHg5. The cardiologist said the valve was friggin’ tight!

Page 5: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 3

Which is a true statement1. Echo has become the gold standard for the

assessment of Aortic valve stenosis2. Cath is still the gold standard for the

diagnosis of Aortic stenosis3. No valve is too tight until the patient has

syncope…

Page 6: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 4

• At maximal dobutamine infusion, in an AS patient, the peak LVOT velocity increased from 50 to 90 cm / sec., while the peak transaortic valve velocity increased from 2 to 2.3 m/sec. The LVOT diameter is 2 cm. This study suggests that:

• 1. The baseline ejection fraction was < 20%.• 2. There is significant AR.• 3. AS is not severe.• 4 LV motion did not improve.

Page 7: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 5

The valve area is?a) 0.3b) 0.5c) 0.8d) 1.0

Page 8: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 6

A patient with severe aortic stenosis has MR. Which one of the following statements is incorrect?

1. The peak mitral regurgitation jet velocity is higher than the peak trans-aortic valve flow velocity.

2. The aortic transvalvular flow duration is shorter than the MR jet duration.

3. The LVOT flow duration is longer than the MR jet duration.

Page 9: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 7

A patient with valvular AS has severe LVOTobstruction (HOCM). The best way to evaluateAS severity in this patient is:1.Dobutamine echo.2.Aortic valve area by planimetry (TEE)3. Valve area using the continuity equation.4. Mean aortic gradient (Bernouilli formula).

Page 10: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Lets talk about Aortic stenosis…

Page 11: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!
Page 12: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

January 2009, JASE

Page 13: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!
Page 14: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Cath Vs Echo

Page 15: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

There are many Echo criteria for Aortic stenosis

Page 16: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Let’s focus on the ones used in daily practice.

Page 17: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

How do we assess the Aortic Valve

• AS jet velocity• Mean trans-aortic gradient• Valve area by continuity equation.• Velocity Ratio (VTI ratio)• Planimetry

Page 18: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Jet Velocity

• This is measured with Continuous wave doppler

• Multiple windows and “non-standard views” to look for the highest Vmax

• Apical and suprasternal or right parasternal most frequently yield the highest velocity;

• subcostal or supraclavicular windows may be required.

Page 19: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Aortic Jet Velocity

• Careful patient positioning and adjustment of transducer position and angle are crucial as velocity measurement assumes a parallel intercept angle between the ultrasound beam and direction of blood flow, whereas the 3D direction of the aortic jet is unpredictable and usually cannot be visualized.

• AS jet velocity is defined as the highest velocity signal obtained from any window after a careful examination

• Lower values from other views are not reported. The acoustic window that provides the highest aortic jet velocity is noted in the report and usually remains constant on sequential studies in an individual patient.

Page 20: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Aortic Jet Velocity Pitfalls• Why multiple views?? Any deviation from a parallel intercept angle

results in velocity underestimation; however, the degree of underestimation is 5% or less if the intercept angle is within 15° of parallel.

• “Angle correction”should not be used because it is likely to introduce more error given the unpredictable jet direction.

• A dedicated small dual-crystal CW transducer is recommended both due to a higher signal-to-noise ratio and to allow optimal transducer positioning and angulation, particularly when suprasternal and right parasternal windows are used.

• However, when stenosis is only mild (velocity 3 m/s) and leaflet opening is well seen, a combined imaging-Doppler transducer may be adequate.

Page 21: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Continuous-wave Doppler of severe aortic stenosis jetshowing measurement of maximum velocity and tracing of thevelocity curve to calculate mean pressure gradient.

Page 22: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Mean Gradients

• The difference in pressure between the left ventricular (LV) and aorta in systole, or transvalvular aortic gradient, is another standard measure of stenosis severity.

• Gradients are calculated from velocity information, and peak gradient obtained from the peak velocity does therefore not add additional information as compared with peak velocity.

• However, the calculation of the mean gradient, the average gradient across the valve occurring during the entire systole, has potential advantages and should be reported.

• The maximum gradient is calculated from maximum velocity – modified Bernoulli equation.

• (assuming that viscous losses and acceleration effects are negligible)• Mean gradient is calculated by averaging the instantaneous gradients over the

ejection period, a function included in most clinical instrument measurement packages using the traced velocity curve.

Page 23: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Continuity Equation

Schematic diagram of continuity equation. The assumption is that SV LVOT = SV Aortic Valve

Page 24: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Continuity Equation

• Calculation of continuity-equation valve area requires three measurements:–AS jet velocity by CWD– LVOT diameter for calculation of a circular

CSA– LVOT velocity recorded with pulsed Doppler.

Page 25: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Continuity Equation

• LVOT diameter and PW of the LVOT needs to taken from the same location in the LVOT.

• LVOT diameter measured off of PLAX.• LVOT velocity (or VTI) is measured apically –

beware of distance error.• The pulsed-Doppler sample volume is

positioned just proximal to the aortic valve so that the location of the velocity recording matches the LVOT diameter measurement.

Page 26: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

LVOT Diameter

• Left ventricular outflow tract diameter is measured in the parasternal long-axis view in mid-systole from the white–black interface of the septal endocardium to the anterior mitral leaflet, parallel to the aortic valve plane and within 0.5–1.0 cm of the valve orifice.

Page 27: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Velocity or VTI measurement

LVOT velocity is measured from the apical approach either in an apical long-axis view or an anteriorly angulated four-chamber view An optimal signal shows a smooth velocity curve with a narrow velocity range at each time point. Maximum velocity is measured as shown. The VTI is measured by tracing the modal velocity (middle of the dense signal)

Page 28: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Pitfalls of the Continuity Equation1. Depends on the variability in each of the three measurements,

including both the variability in acquiring the data and variability in measuring the recorded data.

2. AS jet and LVOT velocity measurements have a very low intra- and inter-observer variability (3–4%) both for data recording and measurement in an experienced laboratory.

3. However, the measurement variability for LVOT diameter ranges from 5% to 8%. When LVOT diameter is squared for calculation of CSA, it becomes the greatest potential source of error in the continuity equation.

4. When trans-thoracic images are not adequate for the measurement of LVOT diameter, TEE measurement is recommended if this information is needed for clinical decision-making.

Page 29: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Pitfalls of the continuity Equation

• When subaortic flow velocities are abnormal, for example, with dynamic subaortic obstruction or a subaortic membrane, SV calculations at this site are not accurate.

• Another limitation of valve area as a measure of stenosis severity is the observed changes in valve area with changes in flow rate.

• In adults with AS and normal LV function, the effects of flow rate are minimal and resting effective valve area calculations are accurate.

• This effect may be significant when concurrent LV dysfunction results in decreased cusp opening and a small effective orifice area even though severe stenosis is not present.

Page 30: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Velocity Ratios

• Another approach to reducing error related to LVOT diameter measurements is removing CSA from the simplified continuity equation. This dimensionless velocity ratio expresses the size of the valvular effective area as a proportion of the CSA of the LVOT.

• Can use VTI as well.

Page 31: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Velocity Ratios

• Severe stenosis is present when the velocity ratio is 0.25 or less, corresponding to a valve area 25% of normal.

• To some extent, the velocity ratio is normalized for body size because it reflects the ratio of the actual valve area to the expected valve area in each patient, regardless of body size. However, this measurement ignores the variability in LVOT size beyond variation in body size.

Page 32: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Aortic valve area planimetry.• Multiple studies have evaluated the method of measuring anatomic

(geometric) AVA by direct visualization of the valvular orifice, either by 2D or 3D TTE or TEE.

• Planimetry may be an acceptable alternative when Doppler estimation of flow velocities is unreliable.

• However, planimetry may be inaccurate when valve calcification causes shadows or reverberations limiting identification of the orifice.

• Caution is also needed to ensure that the minimal orifice area is identified rather than a larger apparent area proximal to the cusp tips, particularly in congenital AS with a doming valve.

• Effective orifice area, rather than anatomic, is the primary predictor of outcome.

Page 33: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Planimetered Aortic VAvle

Page 34: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Brief summary thus far

Page 35: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!
Page 36: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

• As with all patients with aortic stenosis , the echocardiographic evaluation of adults with aortic valve disease should include evaluation of the aorta with measurement of diameters at the sinuses of Valsalva and ascending aorta.

• Aortic root dilation is associated with bicuspid aortic valve disease, the cause of AS in 50% of adults and aortic size may impact the timing and type of intervention. In some cases, additional imaging with CT or CMR may be needed to fully assess the aorta

.

Page 37: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Bicuspid valves

• A bicuspid valve most often results from fusion of the right and left coronary cusps, resulting in a larger anterior and smaller posterior cusp with both coronary arteries arising from the anterior cusp (80% of cases), or fusion of the right and non-coronary cusps resulting in a larger right than left cusp with one coronary artery arising from each cusp (about 20% of cases). Fusion of the left and non-coronary cusps is rare.

Page 38: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Bicuspid Aortic Valves

• In Europe and the USA, bicuspid aortic valve disease accounts for 50% of all valve replacements for AS

• Calcification of a trileaflet valve accounts for most of the remainder, with a few cases of rheumatic AS.

• However, worldwide, rheumatic AS is more prevalent.

Page 39: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Subvalvular Aortic Stenosis

• Dynamic subaortic obstruction, for example, with hypertrophic cardiomyopathy, refers to obstruction that changes in severity during ventricular ejection, with obstruction developing predominantly in mid-to-late systole, resulting in a late peaking velocity curve.

• Dynamic obstruction also varies with loading conditions, with increased obstruction when ventricular volumes are smaller and when ventricular contractility is increased.

Page 40: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Subvalvular AS

• Distinguished from valvular stenosis based on the site of the increase in velocity seen with color or pulsed Doppler and on the anatomy of the outflow tract.

• Subvalvular obstruction may be fixed, due to a discrete membrane or muscular band, with hemodynamics similar to obstruction at the valvular level.

Page 41: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Supravalvular stenosis

• Supra-valvular stenosis is uncommon and typically is due to a congenital condition, such as Williams syndrome

• Persistent or recurrent obstruction in adulthood

Page 42: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Pressure recovery

• What is Pressure Recovery?• The Aortic Pressure measured by cath Distal to the

orifice Is higher than at the orifice (pressure recovery).• Therefore The AoV gradient measured by cath is

LOWER then the the gradient measured by Doppler (which measures the “unrecovered” pressure)

• Aortic Valve area Calculated by cath may be Larger.• The pressure recovery phenomenon is more prominent

In patients with normal (not dilated) aortic root

Page 43: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Some pearls

• In heavy calcific valves, measuring the LVOT accurately may be difficult. In this situation, use another nonregurgitant valve (MV, PV, even TV) – remember in the spirit of conservation of flow, no shunts, and in the absence of significant regurgitation, the stroke volume through each valve should be the same!

Page 44: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

More Pearls

• What to do in rhythms other than sinus.. Afib?• Either average multiple beats for Vmax and

VTI (at least 5).• Alternatively use the highest velocity’s and

their ratios

Page 45: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Other pearls – high cardiac output states

• High cardiac output in patients on Dialysis, with anemia, AV fistula, or other high flow conditions (tachycardia) may cause relatively high gradients in the presence of mild or moderate AS.

• This may lead to misdiagnosis of severe disease particularly when it is difficult to calculate AVA in the presence of dynamic LVOT obstruction.

• In this situation, the shape of the CWD spectrum with a very early peak may help to quantify the severity correctly.

Page 46: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Diastolic dysfunction and Aortic stenosis

• These patients generally have at least Stage I diastolic dysfunction – impaired relaxation but normal LV diastolic filling pressures

• As AS progresses, the diastolic function worsens (stages II – III).

• Presently Diastolic function is not being utilized for management for Aortic stenosis

• Diastolic function improves after AVR and this can be seen with tissue doppler (increase in 2cm/s)

Page 47: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Pitfalls

• Remember Pitfalls – other systolic phenomenon – 1. Mitral regurgitation2. Tricuspid regurgitation3. Dynamic outflow obstruction4. Pulmonic stenosis

Page 48: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Mitral Regurgitation

• Differentiate from AS because the time duration of the 2 are different.

• Longer – MR• Shorter AS• Why – Time interval for AS is only during

ejection of LV systole• MR occurs during IVRT, CT, and IVCT.• MR jet is usually ~ >4-5 m/s (unless LA pressure

is high)

Page 49: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!
Page 50: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Tricuspid regurgitation

• Hopefully knowledge of position will help• Look for significant respirophasic variation

Page 51: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Pitfalls – Dynamic outflow tract obstructions

Look for the late peaking dagger shaped profile. This should increase with valsalva (can change with loading conditions. Aortic Stenosis does not.

Page 52: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Stenosis – “Functional vs True”

• Low output, low gradient AS – is it the valve or the stinky LV function?

• Dobutamine is well validated and very helpful if done CAREFULLY!

• Dobutamine is a β - agonist and increases inotropy and chronotropy. Start at 5mcg/kg/min. Increase q3 minutes. Don’t go past 20 mcg/kg/min. Look for the LVOT velocity to increase to 0.8 – 1.2 m/s or the VTI to increase to 20-25 cm.

Page 53: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Stenosis – “Functional vs True”

• In a truly stenotic valve, the LVOT and AV velocities (and VTIs) increase proportionally.

• In pseudo - stenotic valve, the LVOT velocity• (VTI) increases >>> AV VTI.• Remember the ratio of ¼ (or 0.25) – the so

called “dimensionless index”• Dobutamine can also help determine inotropic

reserve (an increase in stroke volume > 20%) – prognostic implications for patients.

Page 54: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Watch Out for discrepancies• AS Velocity is < 4m/s and AVA < 1cm2

• Check LVOT diameter and compare to previous studies• Check LVOT velocity signal for distance from valve• Calculate a index AVA (AVA/BSA) when height is < 5’5”, BSA <1.5m2 or

BMI is <22• Evaluate for low trans-aortic flow volume

• LVOT stroke volume• 2D LV EF and Stroke volume• Mitral regurgitation• Mitral stenosis

• If the EF is depressed – Consider dobutamine stress echo for assessment• Causes – low cardiac output, small body size, severe mitral regurgitation

Page 55: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Watch Out for discrepancies

• AS Vmax > 4m/s but AVA > 1 cm2• Check Lvot Diameter and check it obtained on previous studies• Check for flow acceleration in LVOT PW signal• Calculate a index AVA (AVA/BSA) when height is < 5’5”, BSA

<1.5m2 or BMI is <22• Evaluate the severity of AR• Evaluate for high cardiac output

• LVOT Stroke volume• 2D LV EF and stroke volume (LVEDV – LVESD)

• Possible causes are high output state, moderate-severe AR, large body size

Page 56: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Classification – in summary

Page 57: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

• Lets Wrap up those questions…

Page 58: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 1

Components for the continuity equation for AVA include all the following except?

1.MV annular diameter2.MV annular VTI3.AV VTI4.LVOT diameter5.All can be used in the continuity equation for the

aortic valve

Page 59: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 1

Components for the continuity equation for AVA include all the following except?

1.MV annular diameter2.MV annular VTI3.AV VTI4.LVOT diameter5.All can be used in the continuity equation for the

aortic valve

Page 60: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 2

Which of the following is not a marker of severe aortic stenosis?1. Vmax across the Aortic valve is > 4m/s2. Calculated aortic valve area of 1.34 cm23. LVOT Vmx / AV Vmx ratio < 0.254. Mean gradient = 55 mmHg5. The cardiologist said the valve was friggin’ tight!

Page 61: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 2

Which of the following is not a marker of severe aortic stenosis?1. Vmax across the Aortic valve is > 4m/s2. Calculated aortic valve area of 1.34 cm23. LVOT Vmx / AV Vmx ratio < 0.254. Mean gradient = 55 mmHg5. The cardiologist said the valve was friggin’ tight!

Page 62: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 3

Which is a true statement1. Echo has become the gold standard for the

assessment of Aortic valve stenosis2. Cath is still the gold standard for the

diagnosis of Aortic stenosis3. No valve is too tight until the patient has

syncope…

Page 63: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 3

Which is a true statement1. Echo has become the gold standard for the

assessment of Aortic valve stenosis2. Cath is still the gold standard for the

diagnosis of Aortic stenosis3. No valve is too tight until the patient has

syncope…

Page 64: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 4

• At maximal dobutamine infusion, in an AS patient, the peak LVOT velocity increased from 50 to 90 cm / sec., while the peak transaortic valve velocity increased from 2 to 2.3 m/sec. The LVOT diameter is 2 cm. This study suggests that:

• 1. The baseline ejection fraction was < 20%.• 2. There is significant AR.• 3. AS is not severe.• 4 LV motion did not improve.

Page 65: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 4

• At maximal dobutamine infusion, in an AS patient, the peak LVOT velocity increased from 50 to 90 cm / sec., while the peak transaortic valve velocity increased from 2 to 2.3 m/sec. The LVOT diameter is 2 cm. This study suggests that:

• 1. The baseline ejection fraction was < 20%.• 2. There is significant AR.• 3. AS is not severe.• 4 LV motion did not improve.

Page 66: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 5

The valve area is?a) 0.3b) 0.5c) 0.8d) 1.0

Page 67: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 6

A patient with severe aortic stenosis has MR. Which one of the following statements is incorrect?

1. The peak mitral regurgitation jet velocity is higher than the peak trans-aortic valve flow velocity.

2. The aortic transvalvular flow duration is shorter than the MR jet duration.

3. The LVOT flow duration is longer than the MR jet duration.

Page 68: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 6

A patient with severe aortic stenosis has MR. Which one of the following statements is incorrect?

1. The peak mitral regurgitation jet velocity is higher than the peak trans-aortic valve flow velocity.

2. The aortic transvalvular flow duration is shorter than the MR jet duration.

3. The LVOT flow duration is longer than the MR jet duration.

Page 69: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 7

A patient with valvular AS has severe LVOTobstruction (HOCM). The best way to evaluateAS severity in this patient is:1.Dobutamine echo.2.Aortic valve area by planimetry (TEE)3. Valve area using the continuity equation.4. Mean aortic gradient (Bernouilli formula).

Page 70: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

Question 7

A patient with valvular AS has severe LVOTobstruction (HOCM). The best way to evaluateAS severity in this patient is:1.Dobutamine echo.2.Aortic valve area by planimetry (TEE)3. Valve area using the continuity equation.4. Mean aortic gradient (Bernouilli formula).

Page 71: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

What do the guidelines say??

Page 72: Aortic Stenosis Kunjan Bhatt MD Austin Heart. Lets Start off with some questions!

THE GLORIOUS END!!!