Board Review
Vikram Chhokar MD
University of Tennessee
Division of Cardiology
Question
 An 80-year-old Asian woman awakens at 2 a.m. feeling
as if she were being smothered. She is brought to the
ED and is found to be in pulmonary edema. She has a
history of a heart murmur, discovered 20 years before.
Prior to this episode she says she was in good health,
although she has not been physically active due to
arthritic discomfort for the past 5 years. On careful
questioning she admits to brief episodes of pressure-like
sensation in her chest especially when she becomes
aggravated.
Question
 Physical examination: BP 150/110 mmHg, pulse
120/min, respirations 24/min. Neck veins 10cm. Lungs
have rales 3/4 the way up posteriorly bilaterally.
Carotids are difficult to feel. PMI is in the 5th intercostal
space just outside the midclavicular line and sustained.
There is a grade II/VI systolic ejection murmur at the
base and a grade II/VI diastolic blowing murmur at the
3rd left intercostal space. There is an S4 and an S3 gallop.
There is no hepatomegaly and no pedal edema.
Question
 Laboratory : Chest X-ray: slightly enlarged cardiac silhouette,
pulmonary vascular redistribution and pulmonary edema. ECG: QS
in V1, a small r in V2, a 25mm R wave in V5 and a 30mm R wave
in V6. There is 2mm ST-segment depression in V4-6 . Echo:
estimated EF 55%, first troponin <0.3 ng/ml.
 The patient is given O2, Lasix, digoxin, and enalapril and becomes
less dyspneic. Her pulse decreases to 90/min and BP to 110/85
mmHg.
Question
 The most probable diagnosis in this case is:
 A. Severe AR
 B Severe aortic stenosis
 C. Hypertensive cardiovascular disease.
 D. Acute non-ST-elevation myocardial infarction.
 E. Congestive heart failure with diastolic dysfunction.
Answer
 The correct answer is B.
The pulses and BP are against severe aortic regurgitation. Although
the patient probably has angina, and even may have coronary
artery disease, the presence of the systolic murmur, the poor
arterial pulses, the severe LVH on ECG make aortic stenosis the
likely diagnosis. Although the BP was elevated when she was in
severe failure due to the excessive sympathetic stimulation and
activated renin angiotensin system, when the patient was treated
the BP returned to normal, inconsistent with acute heart failure due
to hypertensive disease.
Aortic Stenosis
Etiology based on location
Supravalvular
SubvalvularValvular
Supravalvular Aortic Stenosis
Supravalvular
Associated Elfin facies
Hypercalcemia
Peripheral pulmonic stenosis
Thrill palpation in suprasternal notch or R but not L
carotid artery
Increased A2
Subvalvular Aortic Stenosis
Subvalvular
Presents with a high doppler velocity on outflow
tract with normal AV on echo.
Frequent AR due to aortic valve jet
Looks like HOCM on echo with LAM
Two subtypes
Discrete- 10%, sec to subvalvular ridge
Tunnel
Valvular Aortic Stenosis
Valvular
Congenital (1-30 yrs old)
Bicuspid (40-60 yrs old)
Rheumatic (40-60 yrs old)
Senile degenerative (>70 yrs old)
Bicuspid Aortic Valve
The most common congenital cardiac
abnormality is bicuspid aortic valve affecting 12% of the U.S. population.
Over time, one-third to one-half of such valves
become stenotic, with significant narrowing of
the aortic orifice typically developing in the 5th
and 6th decades of life.
Aortic Stenosis Key Points
MCC of AS is senile degenerative
changes
In patients with AS due to rheumatic dz
r/o “silent” mitral stenosis.
Bicuspid or rheumatic should be
suspected in pt with AS presenting in 5th
or 6th decade of life.
Pathophysiology
Increase in afterload
Decrease in systemic and coronary flow
from obstruction
Progressive hypertrophy
Classic symptom triad
Dyspnea
Angina
Syncope
Classic symptom triad
 Once any of these classic symptoms develop, prognosis
dramatically worsens.
 Thus, within 5 years of the development of angina,
approximately 50% of patients will die unless aortic
valve replacement is performed.
 For syncope, 50% survival is 3 years
 For congestive heart failure, 50% survival is only 2
years unless the valve is replaced.
 Angina 5, Syncope 3, and CHF 2.
Characteristic Physical findings
Dampened upstroke of carotid artery
Sustained bifid left ventricular impulse
Absent A2
Late-peaking systolic ejection murmur
A concomitant systolic thrill indicates the
presence of AS (mean gradient >50mm Hg)
Of note if you have significant Physical finding
and symptoms, you must rule out severe AS.
Aortic Stenosis
Patients with the physical findings of AS should
undergo selected laboratory examinations,
including an ECG, a chest x-ray, and an
echocardiogram.
The 2-D echocardiogram is valuable for
confirming the presence of aortic valve disease
and determining left ventricular (LV) size and
function, degree of hypertrophy, and presence
of other associated valve disease.
EKG
Usually shows NSR with LVH
Note: If AF is present, concomitant mitral
valve disease or thyroid dz must be
suspected.
Recommendations for
Echocardiography in AS
•Class 1
•Diagnosis and assessment of severity of AS.
•Assessment of LV size, function, and/or hemodynamics.
•Reevaluation of patients with known AS with changing symptoms
or signs.
•Assessment of changes in hemodynamic severity and ventricular
compensation in patients with known AS during pregnancy.
•Reevaluation of asymptomatic patients with severe AS.
•Class IIa
•Reevaluation of asymptomatic patients with mild to moderate AS
and evidence of LV dysfunction or hypertrophy.
•Class III
•Routine reevaluation of asymptomatic adult patients with mild AS
having stable physical signs and normal LV size and function.
ECHO
Modified Bernoulli equation (P=4v2) used to
calculate gradient.
A maximal instantaneous and mean AV gradient
is derived from the continuous-wave Doppler
velocity across the aortic valve.
AVA can be estimated by continuity equation:
AVA=LVOTarea LVOTTVI
AVTVI
ECHO/Doppler Pit Falls
Will underestimate AS if Doppler beam is not
parallel to AS velocity jet.
Will rarely over-estimate mean gradient
Severe anemia (hemoglobin <8.0 g/dl)
Small aortic root
Sequential stenoses in parallel (coexistent LVOT and
valvular obstruction)
Severity of AS
Severity
Mild
Mean gradient AV area
(mm Hg)
(cm2)
<25
>1.5
Moderate
25-50
1-1.5
Severe
>50
<1.0
Critical
>80
<0.7
Cath data
“Pull back” tracing can be used in pt with NSR
but not accurate in irregular rhythms or low-out
put states.
In low cardiac output, the stenosis may be
severe, with a mean gradient <50mm Hg per
echo.
Gorlin equation can be used to calculate AVA
from pressure gradients, independent of CO.
AVA= (1000)(CO)
(44)(SEP)(HR)(√P)
Hakke formula
Simple way to do things!
Used to calculate AV area
AVA=CO/(p-p gradient)
Treatment
 AVR is clearly indicated in symptomatic patients.
 Management decisions are more controversial in
asymptomatic patients.
 Patients with severe AS, with or without
symptoms, who are undergoing CABG should
undergo AVR at the time of revascularization.
 There is general consensus that patients with
moderate AS (e.g., mean pressure gradient ≥30
mm Hg) should undergo AVR at the time of CABG,
but controversy persists regarding the indications
for concomitant AVR at the time of CABG in
patients with milder forms of AS.
Treatment Key Points
Aortic valve replacement is indicated for
patients with symptoms of severe AS,
regardless of the LV ejection fraction.
Coronary angiography may not be required
preoperatively in younger patients without risk
factors for CAD.
Percutaneous aortic balloon valvuloplasy is
reserved only for critically ill patients as a
“bridge” to surgery.
Asymptomatic patients with
Severe AS
“The most common cause of death in
patients with severe aortic stenosis is an
operation” The prevailing notion.
Surgery should be performed at the onset
of symptoms or LV systolic dysfunction.
AS w/ low output/low gradient
Exercise testing maybe performed to
document exercise tolerance and
hemodynamic response in pts with low
CO.
AS w/ low output/low gradient
Question
 55yo presents with DOE for past 6 months which is worsening. Pt
has no significant PMH. PE: carotid upstroke 2+ delay but full
volume, Second heart sound is single. There is a 3/6 SEM at RSB
with mid-peak which ends at second heart sound. Echo: mild
LVH, EF 65%, AV calcified and restricted. LVOT diameter is
2.0cm. Peak AV velocity is 2.5 m/sec with mean gradient of 18mm
HG. LVOT velocity is 1.0 m/sec.
 What is the AVA?
A. 0.5 cm2
B. 0.8 cm2
C. 1.0 cm2
D. 1.2 cm2
Answer
 AVA can be estimated by continuity equation:
 LVOT diameter is 2.0cm. Peak AV velocity is 2.5 m/sec with mean
gradient of 18mm HG. LVOT velocity is 1.0 m/sec.
 The first step is to calculate the cross-sectional area of LVOT, as
follows: CSA (LVOT) = π r2 = π(d/2)2.
CSA (LVOT) = π r2 = π(d/2)2 = π(2/2)2 = π(1)2 = π
 The formula for calculated aortic valve area (AVA) is:
AVA (cm2) = CSA (LVOT) x (Vmax LVOT) ÷ Vmax AoV.
 In this case, AVA = π cm2 x (1.0 m/sec ÷ 2.5 m/sec) =
3.14 cm2 x (0.4 m/sec) =
1.2 cm2
Question
 What is the most likely etiology of this patient valve disease?
A. Bicuspid.
B. Inflammatory process.
C. degenerative calcific disease.
D. Congenital unicuspid valve.
Question
 What is the most likely etiology of this patient valve disease?
A. Bicuspid.
B. Inflammatory process.
C. degenerative calcific disease.
D. Congenital unicuspid valve.
Question
 What is the next step in the management of this patient?
A. Dobutamine Echo.
B. Medical treatment.
C. Medical treatment but repeat study in 6 months.
D. R/L heart cath with CO, AV gradient and coronary angio.
E. Coronary angiogram and AVR.
Answer
 What is the next step in the management of this patient?

 A. Dobutamine Echo- only for Low CO pt with EF
65%
 B. Medical treatment-pt with symptoms,
 C. Medical treatment but repeat study in 6 months.
 D. R/L heart cath with CO, AV gradient and
coronary angio. Gives you more info
 E. Coronary angiogram and AVR- AVA 1.2 per echo
need more info before AVR
Question
 Cardiac Cath: Aortic pressure 130/70 mmHg. LV pressure 180/15
mmHg. CO via thermo-dilutioon is 3.5 L/min. SEF is 280 ms at
HR of 70bpm. Oxygen consumption is 270 cc/min. Pulmonary
artery saturation is 64% and femoral artery saturation is 98%.
Coronary arteries are normal
 What is the calculated AVA?
A.
B.
C.
D.
0.5 cm2
0.8 cm2
1.0 cm2
1.2 cm2
Answer
 Cardiac Cath: Aortic pressure 130/70 mmHg. LV pressure 180/15 mmHg.
CO via thermo-dilutioon is 3.5 L/min.
 What is the calculated AVA?
A.
B.
C.
D.
0.5 cm2
0.8 cm2
1.0 cm2
1.2 cm2
Use Hakke formula
AVA=CO/(p-p gradient)
 AVA=3.5 /(180-130)
 3.5/7= 0.5 cm2
Question
 What is the next step in the management of this patient?




A. Medical therapy
B. AVR- homograft
C. AVR- mechanical
D. AVR - Ross procedure
Answer
 What is the next step in the management of this patient?




A. Medical therapy
B. AVR- homograft
C. AVR- mechanical
D. AVR - Ross procedure
 Less then 65yo without CI Mechanical valve TOC.
Question
 The calculated aortic valve area using LVOT diameter = 2cm, Vmax
AV = 4 m/sec, and Vmax LVOT = 0.8 m/sec is:
A. 0.6cm².
B. 1.0cm².
C. 2.0cm².
D. 1.2cm².
E. 1.5cm².
Answer
The correct answer is A.
The first step is to calculate the cross-sectional area of
LVOT, as follows: CSA (LVOT) = π r2 = π(d/2)2.
The formula for calculated aortic valve area (AVA) is:
AVA (cm2) = CSA (LVOT) x (Vmax LVOT) ÷ Vmax AoV.
In this case, AVA = π cm2 x (0.8 m/sec ÷ 4 m/sec) =
(3.14)(0.2)= 0.6cm2
Question
 A 50-year-old man is referred with a murmur of aortic stenosis--an
incidental finding on a routine physical examination. The patient
denies cardiac symptoms.
The physical examination was unremarkable except for a grade IV/
VI late crescendo murmur typical of aortic stenosis and an S4
gallop. The resting ECG showed minimal ST and T changes but no
voltage criteria for LVH. The Doppler echocardiogram showed a
mean gradient of 60 mmHg with thickening of the ventricular walls
but a normal ejection fraction. The patient underwent a Bruce
protocol exercise test and quit after 5 minutes because of dyspnea.
The thallium image showed no localized defect.
Question
 What is the most appropriate management strategy at this time?
A. Follow the patient with echocardiography every 6 months.
B. Perform a dobutamine stress echo.
C. Start enalapril.
D. Follow the patient with an exercise stress test every 6 months.
E. Recommend aortic valve replacement.
Answer
 The correct answer is E.
 This patient has severe aortic stenosis. Although the patient claims
to be asymptomatic, his poor performance on the exercise test
indicates he is not. In fact, patients with "asymptomatic" aortic
stenosis have a 2-4% risk of cardiac death. Usually, however,
symptoms develop 1-3 months before death.
 In view of the low surgical risk and good long-term result of
mechanical prosthetic valves, plus the definite incidence of sudden
death in symptomatic patients who are not operated upon, the
prudent course is to recommend aortic valve replacement.
 This patient has a low risk of associated coronary artery disease,
but this would need to be evaluated by catheterization
preoperatively
Question
 Which one of the following is the most reliable measurement of the
severity of aortic stenosis in a 75-year-old patient with congestive heart
failure, a calcified aortic valve, and an ejection fraction of 25%?
A. Aortic valve area at the time of cardiac catheterization.
B. Pressure gradient across the valve.
C. Angiographic appearance of the valve.
D. Dobutamine stress echo Doppler.
E. Radionuclide exercise study.
Answer
 The correct answer is D.
For reasons that are not totally clear, the Gorlin formula for aortic valve
area becomes less reliable in patients with calcific valves and a low
ejection fraction and a low cardiac index. Such patients typically have
only a modest pressure gradient across the valve.
The angiographic appearance of the valve is not reliable for distinguishing
between moderate and severe disease when the valves are calcified.
Likewise, a radionuclide angiogram would be of limited use in this setting
(and the patient probably could not perform it).
Recent evidence suggests that a dobutamine echo-Doppler study is a more
reliable method of calculating aortic valve severity when the cardiac
output is increased by dobutamine. When the aortic stenosis is significant,
the gradient will significantly increase.
Question
 Which of the following is least likely to be a determining factor in
the operative risk of valvular aortic stenosis?
A. An aortic valve area of less than 0.7 cm².
B. The presence of coronary artery disease.
C. Left ventricular systolic dysfunction.
D. The presence of atrial arrhythmias.
E. Coexisting aortic regurgitation.
Answer
 The correct answer is A.
The valve area defines severity of aortic stenosis, but not the risk of
operation.
The presence of coronary artery disease increases risk in most
studies--up to 2X in some. Failure to bypass significant disease at
the time of valve replacement substantially increases risk. Severe
LV dysfunction with its associated symptoms and signs of
congestive heart failure increases risk, which parallels functional
class. Patients in atrial fibrillation have a higher risk of surgery.
They are generally later in the natural history of the disease and
have other cardiovascular morbidity. Coexisting aortic
regurgitation does increase risk in some studies.
Question
 The following hemodynamic data were obtained in patients with isolated
valvular aortic stenosis. Which of the following is consistent with severe
aortic stenosis?
 A. Mean gradient across the aortic valve of 23 mmHg with cardiac index of 3.0
l/min/m², and normal left ventricular function.
 B. Mean gradient across the aortic valve of 28 mmHg, cardiac index of 1.8
l/min/m², left ventricular ejection fraction of 29%; after dobutamine infusion, the
aortic valve gradient is 28 mmHg, and the cardiac index is 3.2 l/min/m².
 C. Mean gradient across the aortic valve of 32 mmHg, cardiac index of 1.5
l/min/m², and LV ejection fraction of 28%; after dobutamine infusion, mean
gradient across the aortic valve is 50 mmHg and cardiac index 3.0 l/min/m².
 D. Mean gradient across the aortic valve of 25 mmHg, cardiac index of 3.5
l/min/m² with an LV ejection fraction of 35%.
Answer
 The correct answer is C.
The interpretation of pressure gradients must include an analysis of
flow. The difficult clinical question is whether the low gradient,
usually in the 20-30 mmHg range, is associated with severe aortic
stenosis masked by low flow. The flow may be so low that even in
the presence of a severe anatomic narrowing, the gradient is low-thus the need to remeasure the gradient after inducing an increase
in flow.
In the first example, a mean gradient of 23 mmHg with normal LV
function and cardiac index is consistent with mild aortic stenosis.
Question
 A 62-year-old man presents with chest pain typical of angina
pectoris, New York Heart Association functional class II. Physical
examination reveals a grade III/VI musical systolic ejection
murmur at the left sternal border, radiating to the neck. A2 is
decreased but present. Echocardiography shows left ventricular
hypertrophy, a normal ejection fraction, and a calcified aortic valve
with a valve area of 0.8cm2.
He undergoes a coronary arteriogram, which shows a diffusely
calcified aortic valve with reduced mobility and a pressure gradient
of 45mm across the valve. The left ventricle appears normal. There
is, however, an 85% diameter stenosis of both the proximal left
anterior descending and proximal right coronary artery.
Question
 Which one of the following therapeutic approaches offers the most
favorable long-term result for this patient?
 A. Medical therapy with beta blockers, aspirin, and enalapril and followup every 6 months until the aortic stenosis worsens.
 B. Coronary artery bypass grafting, including a left internal mammary
artery and aortic valve replacement with a bioprosthesis.
 C. Coronary artery bypass grafting, including an internal mammary artery
and aortic valve replacement with a mechanical prosthesis.
 D. Coronary artery bypass grafting, including an internal mammary
artery, but delaying aortic valve replacement until the lesion is more
severe.
 E. Multivessel angioplasty now, following the patient until the aortic valve
disease becomes more severe.
Answer
 The correct answer is C.
This patient has severe coronary artery disease requiring
interventional treatment. He has concurrent, moderately severe
aortic stenosis that is nearly bad enough to warrant surgical repair
on its own. There would be a high surgical risk to fixing the
coronary lesion but not the aortic valve, as there would be also for
multivessel angioplasty.
He probably is not a candidate for medical therapy, in view of the
severity of both his valve and coronary artery disease. Postponing
aortic valve surgery and performing bypass only now would
expose him to operative mortality in the excessively high 15-25%
range.
Answer
 This patient might be expected to live 20 years, in view
of his normal left ventricle and the favorable results of
internal mammary bypass. Thus, his best outcome
would be to have a coronary artery bypass operation
and simultaneous aortic valve replacement.
 Although the combined surgery slightly increases the
operative mortality for aortic valve replacement (510%), it is still significantly less than that for a re-do
operation to replace the aortic valve sometime after the
bypass procedure has been performed.
Question
 An 18-year-old college freshman presents with 3 days of flu-like
symptoms and sharp right chest pain with inspiration.
Physical examination shows BP 100/70, pulse 88 regular, temp
100F, respiration rate 20. HEENT is negative except for boggy
nasal mucosa. JVP is normal. Carotids with slow upstrokes,
palpable systolic thrills, and systolic bruits. Normal breath sounds,
lungs clear, but he splints inspiration, complaining of pain on
inspiration along right costal margin.
S1 is normal, S2 with increased A2, ejection click and grade IV/VI
systolic ejection murmur upper right sternal border radiating to the
neck. No diastolic murmur. Abdomen negative. Extremities with
2+ pulses, no brachial-femoral delay. No edema, cyanosis,
clubbing.
Question
 ECG shows increased precordial voltage.
 Chest x-ray normal.
 Echo-Doppler study shows a 50 mmHg aortic valve
gradient, mobile "doming" leaflets, mild aortic
regurgitation, aortic valve area 1.0 cm2, mildly
increased LV mass, LV ejection fraction 75%. No
pericardial effusion.
Question
 Which one of the following is appropriate next?
A. Treat him symptomatically for viral infection, discuss antibiotic
prophylaxis, and arrange follow-up visit.
B. Refer for aortic valve replacement as soon as possible.
C. Treat with penicillin and aspirin and start rheumatic fever prophylaxis.
D. Eliminate balloon valvotomy as a therapeutic option due to age and
presence of aortic regurgitation.
E. Draw blood cultures and initiate IV antibiotics for treatment of
endocarditis.
Answer
 The correct answer is A.
 Because the patient has viral pleurisy and an exam consistent with
moderate aortic stenosis, likely congenital, prophylaxis and regular follow
up are important.
 Referring for aortic valve replacement is inappropriate because aortic
stenosis is moderate and asymptomatic, so follow-up is appropriate. You
could consider a valvotomy, as gradient is 50mm and he has LVH, but not
valve replacement. There are insufficient criteria for rheumatic fever and
the echo findings are classic for congenital AS. Although he could have a
valvotomy, he has a mobile, bicuspid valve with mild and inaudible aortic
regurgitation and no contraindications. Making a distinction between
whether he is an adolescent, reaching pediatric criteria for intervention, or
an adult is of no consequence in this instance. Blood cultures and IV
antibiotics are not called for because viral syndrome is likely. He should
instead be instructed to monitor fever, report if high and chills, and be
given no antibiotics. Blood cultures could be drawn, but likely will be
negative.
Question
 A 77-year-old man with chronic angina pectoris of 3
years duration has had increasing symptoms for the past
6 weeks with episodes at rest, nocturnal episodes, and
prolonged episodes with effort often requiring two to
three sublingual nitroglycerins (instead of the usual one
or rest) for relief. His overall health is good. He is
known to have aortic stenosis of moderate degree with
typical findings. His blood pressure is 140/80, heart rate
of 72, his carotid pulses show delayed upstroke. There
is no jugular venous hypertension or basal thrill. The
apical impulse is localized but enlarged and forceful.
There is no aortic second sound and a typical musical
murmur of calcific aortic stenosis.
Question
 His electrocardiogram shows moderate voltage for
LVH, flattening of the T waves, and left atrial
abnormality and no suggestion of myocardial infarction.
An angiographic study showed major narrowings in the
proximal portions of all three of his coronary trunks,
diffuse disease throughout the arteries but good distal
vessels. There is moderate narrowing in the LMCA. A
pullback mean gradient was 30 mmHg. The valve is
heavily calcified. The ejection fraction was estimated at
55-60%
Question
 Which of these management strategies is preferred?
A. CABG without aortic valve replacement.
B. Increase medical therapy adding a beta blocker.
C. Perform a thallium test to localize ischemia, and perform
intentionally incomplete revascularization utilizing PCI.
D. Dobutamine stress test to study ischemia and evaluate the
gradient during stress.
E. CABG with aortic valve replacement.
Answer
 The correct answer is E.
This problem of senile calcific aortic stenosis with major coronary atherosclerosis
is a vexing problem occurring with increasing frequency in the elderly population.
The issue here is to predict the progression of his aortic stenosis. Although a
spectrum of opinions exist, in centers with excellent cardiac surgery, option E,
CABG with valve replacement, is preferred. Although the combination surgery
modestly increases risk, the chance of a need for valve replacement during the next
3-5 years is quite high, so isolated CABG is problematic in reference to a "long
term solution" to this elderly man’s problem. Though data are sparse and
fragmentary, particularly in elderly patients, data indicate aortic stenosis of
moderate severity, particularly with heavy calcification, is likely to become
symptomatic and require valve replacement within 5 years. Avoiding an emergency
operation is important, and the risk of two open-heart surgical procedures in
patients over the age of 75 during a 3-5 year period is significantly more risky than
doing a single procedure.
Answer
 Although a PCI procedure in the elderly is appealing (C), the
extent of disease in this patient coupled with his diabetes makes
PCI problematic. However, if PCI were successful in relieving his
angina, it would provide relief for several years during which the
aortic stenosis could progress. There is no advantage and perhaps
some minimal risk in dobutamine echo-cardiographic study (D) in
this patient. Although its role in assessing aortic stenosis remains
uncertain, its chief value is in patients who have a low gradient
(such as this patient) but with reduced ventricular function (which
is not the case in this patient) in an effort to differentiate the effects
of afterload increase from reduced contractility on the ventricular
dysfunction. Medical therapy (B) is extremely unlikely to be useful
in this patient, with worsening of angina considering his age, AS,
and overall duration of his complaint.
Question
 All of the following are echocardiographic evidence for aortic stenosis
except:
A. Concentric LVH.
B. Markedly thickened and restricted aortic valve leaflets.
C. TVI LVOT/TVI AV < 0.25.
D. V (max) AV > 4.5m/sec.
E. TVI (AV)/TVI (LVOT) < 0.25.
Answer
 The correct answer is E.
The dimensionless index is TVI LVOT/TVI AV. If this is < 0.25,
then a patient has severe aortic stenosis. Patients with significant
aortic stenosis have LVH as a response to the increased workload
on the LV. Patients with aortic stenosis have markedly thickened
and restricted aortic leaflets unless they have an unusual form of
congenital aortic stenosis, such as a unicuspid aortic valve. A Vmax
> 4.5m/sec across the aortic valve would correspond to a peak
pressure gradient of 81 mmHg, which would be consistent with
severe aortic stenosis.
Question
 You are responsible for the care of a vigorous 72-year-old man
with acquired degenerative calcific valvular aortic stenosis,
accompanied by mitral regurgitation and calcification of the mitral
annulus.
 He has survived infective endocarditis with multiple positive
cultures for Streptococcus mutans, which you judged to be of
dental origin although there had been no specific dental
intervention related temporally with the onset of symptoms.
 Based on catheterization data completed during his antibiotic
course, you feel that aortic valve replacement and inspection of the
mitral valve and adjacent structures are indicated. The patient has
11 remaining teeth that are in poor repair.
Question
 Which one of the following is the best plan?
 A. Ignore the dental status in deference to the more serious
valvular heart disease.
 B. Discharge the patient to the care of his dentist to permit cautious
dental extraction of one to two teeth per visit.
 C. Schedule full-mouth extraction well in advance of the
anticipated cardiac surgery.
 D. Schedule full-mouth extraction synchronous with cardiac
surgery, thus avoiding a second anesthesia.
 E. Delay all dental procedures until after the cardiac surgery.
Answer
 The correct answer is C.
This patient's dental hygiene probably is the source of his endocarditis,
demonstrating that a dental procedure is indeed not required for endocarditis to
occur. In terms of his ongoing risk for recurrent endocarditis, proper management
of his dentistry preoperatively is perhaps the most important factor. Once his
prosthetic valve is implanted, he is then forever maximally at "high risk" such that
any issues that can be addressed safely and reasonably before cardiac surgery
should be done.
Removal of all his teeth at once is a procedure that dental surgeons can accomplish
with little difficulty, thereby undertaking the risk of extraction-related bacteremia
once rather that several times. The serial approach, in addition to being
unnecessary, would raise the additional issue of cumulative antibiotic resistance via
the chemoprophylaxis regimens, which would need to be given for each of the
procedures.
Answer
 Performing this procedure in conjunction with the cardiac surgery
(in any sequence) would simply add unnecessary stress (as well as
bacteremia) to a time that is already high-risk in and of itself.
Delaying the dentistry would simply make likely the occurrence of
prosthetic valve endocarditis (PVE) via the same mechanisms
responsible for the original infectious illness.
Careful preoperative dental evaluation is recommended so that
required dental treatment can be completed at least several weeks
prior to cardiac surgery whenever possible. Such measures may
decrease the incidence of late postoperative endocarditis.
Question
 Catheter-delivered balloon expansion techniques are now the
treatment of choice for which one of the following lesions in
adults?
A. Valvular pulmonic stenosis.
B. Valvular aortic stenosis.
C. Coarctation of the aorta.
D. Ebstein's anomaly of the tricuspid valve.
E. Severe mitral stenosis/regurgitation.
Answer
 The correct answer is A.
Although catheter balloon valvuloplasty and aortoplasty have been
attempted in all these conditions, only pulmonary valvotomy has
achieved a success level consistent with being the treatment of
choice in adults. Aortic stenosis responds initially to balloon
expansion and may serve as a bridge to valve replacement surgery,
but is associated with rapid restenosis. Success rates with
coarctation and Ebstein's anomaly are not uniform enough to
displace surgery except in selected patients.
Mitral stenosis in the absence of severe subvalvular disease can be
successfully treated by balloon valvuloplasty, but the presence of
moderate to severe regurgitation is an indication for surgery.
Work Cited
Mayo Board Review
ACCSAP V
Up-To-Date
ACC/AHA Guidelines
The End