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Constrictive/Restrictive
Cardiomyopathies: Diagnosis and
Management Update;
Radiation Induced Heart Disease
Alexander (Sandy) Dick, MD
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Outline
• Pericardial Constriction
– Diagnosis: Imaging, Hemodynamics
– Outcomes
• Restrictive Cardiomyopathy
– Diagnosis: Imaging
• Radiation Induced Heart Disease
– Incidence
– Imaging follow-up
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Case
• 65 yo gentleman with Hx of pericarditis in
1985 and 1987.
• Afib, global LV dysfunction LVEF 40-45%
• 6 month Hx of increasing dyspnea NYHA
Class III. Significant peripheral edema.
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General Principles
• Both constrictive pericarditis and restrictive cardiomyopathy represent disorders of impaired diastolic filling.
• In constriction, filling is limited by a non-compliant, rigid pericardium that restricts cardiac volumes.
• In restriction, filling is impaired by stiff myocardium.
• Presentation of these two conditions may be similar (RHF), but therapy is very different.
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Pathophysiological Differences
Constriction - Myocardial compliance is
normal
- No impedance to early
diastolic filling
- Total cardiac volume is fixed
by the pericardium
- Atria are able to empty into the
ventricles, though at higher
pressure
- Marked respiratory effect on
LV and RV filling
Restriction - Abnormal myocardial
compliance
- Impedance to filling increases
throughout diastole
- Pericardium is compliant
- Septum is non-compliant
- Atrial enlargement and
pulmonary HTN is common
- Minimal respiratory effect on
LV and RV filling
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Etiology of Pericardial Constriction
• 3 series for total >400 patients with
constriction proven at surgery
– Idiopathic/viral 42-49%
– Post cardiac surgery 11-37%
– Post radiation therapy 9-31%
– Connective tissue 3-7%
– Bacterial 3-6%
– Misc 1-10%
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Risk Constriction post Acute
Pericarditis
• 500 consecutive cases
• All causes 1.8%
– Idiopathic/viral <0.5%
– Connective tissue/injury 2.8%
– Neoplastic 4.0%
– TB 20%
– Purulent 33%
• Reversible 15%
Imazio, Circ 2011: 1124; 1270-75
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Echocardiographic parameters in constrictive
pericarditis and restrictive cardiomyopathy
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Echo Studies
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LV RV Strain
Kusunose, Circ Card Imag, 2013
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Reality
• Echo report: “Echo findings not diagnostic
of pericardial constriction. However if the
clinical suspicion is high, suggest CT/MRI
or hemodynamic study.”
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Normal Pericardium
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Pericardial Thickening
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Constrictive Pericarditis in 26 Patients With
Histologically Normal Pericardial Thickness,
Circ 2003; 108:1852-1857
But…
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CT Pericardial Calcification
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Effusive constrictive
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Case CT
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Zurick, JACC Image, 2011, 1180-91
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Zurick, JACC Image, 2011, 1180-91
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LGE Intensity and CRP Predicts
Reversibility
Feng D et al. Circulation. 2011;124:1830-1837
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Criteria Sensitivity Specificity PPV NPV
Traditional
1. LVEDP-RVEDP ≤5 mmHg 60 38 4 57
2. RVEDP/RVSP > 1/3 93 38 52 89
3. PASP <55mmHg 93 24 47 25
4. LV rapid filling wave
≥ 7mmHg
93 57 61 92
5. Respiratory change in
RAP <3 mmHg
93 48 58 92
Hemodynamics of Constriction Traditional Criteria
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Respiratory Influences
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Hemodynamic Principles
3. In severe constrictive pericarditis, changes in
intrathoracic pressure is not communicated to the
pericardial space.
- CVP and RAP do not , and may actually with inspiration
(Kussmaul)
- Interdependence of ventricular filling – on inspiration,
intrathoracic pressure and pulmonary venous pressure , but
LA pressure does not. A reduced pulmonary veins to LA
gradient results in decreased flow into the LA and LV.
Decreased LV filling allows for more RV filling (compliant
septum), leading to increased flow across the TV
LV Stroke volume, RV Stroke volume
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Hemodynamics of Constriction Dynamic Respiratory Criteria
1. PCWP- LV respiratory difference ≥ 5mmHg.
2. RV/LV interdependence (ie. RV - LV
discordance) , systolic area index >1.1.
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Hatle LK, et. al.
Circ. 1989;79357-370
1. PCWP-LV respiratory change ≥ 5mmHg
15 7
15 - 7 = 8 mmHg
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Nishimura R A Heart 2001;86:619-623
Inspiration
LV and RV are discordant = CONSTRICTION
2. RV/LV interdependence
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Nishimura R A Heart 2001;86:619-623
2. RV/LV interdependence
Inspiration
LV and RV are concordant = RESTRICTION
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Systolic Area Index > 1.1
• Systolic area index
= RV area/LV area in inspiration
RV area /LV area in expiration
= >1.1 is consistent with constriction
Talreja, JACC 2008: 315-19
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Restriction
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Constriction
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Criteria FOR CONSTRICTION Sensitivity Specificity PPV NPV
Traditional
1. LVEDP-RVEDP ≤5 mmHg 60 38 4 57
2. RVEDP/RVSP > 1/3 93 38 52 89
3. PASP <55mmHg 93 24 47 25
4. LV rapid filling wave ≥
7mmHg
93 57 61 92
5. Respiratory change in
RAP <3 mmHg
93 48 58 92
Dynamic Respiratory
1. PCWP/LV respiratory
gradient ≥ 5mmHg
93 81 78 94
2. LV/RV Interdependence 100 95 94 100
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Pericardectomy
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Retrospective Studies
• Ling Circulation 1999;100: 1380–86.
• Cameron Am Heart J 1987;113:354–60.
• Bertog J Am Coll Cardiol 2004;43: 1445–52.
• George Ann Thorac Surg 2012;94:445–51.
• Ghavidel Tex Heart Inst J 2012;39: 199–205.
• Lin Asian Cardiovasc Thorac Ann 2001;9:286–90.
• Chowdhury Ann Thorac Surg 2006;81:522–29.
• DeValeria Ann Thorac Surg 1991;52:219–24.
• Nataf Eur J Cardiothorac Surg 1993;7:252–55.
• Tirilomis Eur J Cardiothorac Surg 1994;8:487–92.
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Pericardectomy
• 313 patients 1936 -1990, the overall
mortality was 14%
– NYHA IV 46%; III 10%; I and II 1%)
• 135 patients1985 -1995 the 30-day
perioperative mortality 6%
– 10 yr follow-up independent predictors of late
survival were age, NYHA class and previous
radiation
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Pericardectomy
• Perioperative mortality of 5–7.6% in recent
studies
– Most frequent cause of death low output HF
failure, as described in
• Idiopathic constrictive pericarditis had the
best prognosis with 7-year Kaplan-Meier
survival of 88%, post-surgical constrictive
pericarditis with 66% and post-radiation
constrictive pericarditis with 27%.
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Restriction
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Amyloid Sarcoid
Myocarditis Peripheral Eosinophilia
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Iron Overload
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So Where Should CMR Fit into
Practice?
“Every patient with undiagnosed
cardiomyopathy deserves one good
CMR exam!” Raman SV, Simonetti OP. HF Clinics 2009; 5:293-300.
“Every patient with heart failure
should have a CMR exam!”
European Heart Failure Guidelines, 2012.
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Radiation Induced Heart Disease
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Relative risks of RIHD in cancer survivors
Consensus RIHD Follow-up Imaging, Eur Hrt J, 2013
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Risk factors of RIHD
Consensus RIHD Follow-up Imaging, Eur Hrt J, 2013
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Radiation Induced Osteogenesis AV
Nadlonek, J Thor Card Surg, 2012.
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Acute Chronic
Pericarditis Acute and delayed acute
Effusion predicts late CP
20% within 2yrs
4-20% CP (dose dependent)
Cardiomyopathy Acute myocarditis
Mild dysfunction
Diffuse fibrosis (>30Gy)
Restrictive
Valve Disease None Regurg > Stenosis
1% 10yrs, 5% 15yrs
>20yrs 15% Mod AR, AS
CAD
Perfusion defect 47% Accelerated at young age
Latent >10yrs
Ostial involvment
RR MI death 2.2 - 8.8
Carotid None Incidence 7.4%
Other vascular None Porcelain aorta
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