Imaging of Repaired Tetralogy of Fallot in Adults
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1 SURGICAL MORPHOLOGY and IMAGING of CONGENITAL HEART DISEASE WORKSHOP 22 nd SEPTEMBER, 2016 Imaging of Repaired Tetralogy of Fallot in Adults Tan Ju-Le MBBS, MRCP, FAMS, FACC, FESC Director, Senior Consultant Cardiologist Adult Congenital Heart Disease Program National Heart Centre SINGAPORE
2 Imaging of Repaired TOF in adults What constitutes a repaired TOF? TOF Anatomy and Surgical Repair Echo assessment of repaired TOF patients Residual Lesions Sequlae of the repair PR severity RV function MRI assessment of Post op TOF patients CT assessment of Post op TOF patients
3 TOF Anatomy The anterior and cranial displacement of the infundibular septum causes some degree of RVOT obstruction and malaligned VSD with overriding aorta RVH follows from the RVOT obstruction Made up of 4 defects Overriding aorta Ventricular Septal Defect (VSD) RVOT obstruction ± Pulmonary Stenosis Right Ventricular Hypertrophy (RVH)
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5 Very rarely, we still see adult patients presenting for the first time with unrepaired TOF This 33 year old lady with uncorrected TOF, lost to follow up, recently referred bec of increasing SOB; getting married next year and planning to have children
6 TOF Surgical Repair a) Ventriculotomy approach In patient with severe RVOT obstruction b) Pericardial patch to RVOT c) Transannular pericardial patch d) Bicuspid PV and hypoplastic main PA e) Patch augmentation of RVOT and mpa TOF Repair R. Jonas : Semin Thorac Cardiovasc Surg Pediatr Card Surg Ann 12:39-47, 2009.
7 Reason for PR post surgical repair of TOF If pulmonary annulus is hypoplastic and disrupted during surgery with a transannular patch (TAP), PR is almost always inevitable Some centers are advocating valve sparing repair with patch augmentation of main PA but not across the pulmonary annulus; creation of a PV monocusp using PTFE Y incision bec main PA hypoplastic Augment with a patch
8 ECHO assessment of rtof - Residual Lesions - Sequlae of TOF repair - PR severity - RV function
9 Residual Lesions Right Ventricular Outflow Tract Obstruction / Residual Infundibular Stenosis Pulmonary Valvular Stenosis Residual Ventricular Septal Defect
10 Echo assessment: Sequelae of TOF Repair Pulmonary regurgitation RVOT aneurysm RV dilatation and dysfunction LV dysfunction Tricuspid regurgitation Pulmonary artery stenosis Aortopathy aortic root dilatation and aortic regurgitation Pulmonary hypertension (late repair of pink TOF)
11 Residual VSD and severe PR
12 Challenging: Residual VSD shunt, need to scan at all planes and windows Standard SAX view, no residual VSD seen Modified low SAX view from LSE showed residual VSD with left to right shunting on colour Doppler For VSD patch, residual shunt usually present at either end of the patch
13 RVOT Aneurysm RVOT aneurysm can occur after extensive infundibular resection with or without patching Contribute to RV dysfunction Initiation of ventricular arrhythmia
14 Tricuspid regurgitation One mechanism for TR involves disruption of the integrity of the tricuspid septal-anterior commissure by the VSD patch, resulting in TR jet originating at the junction between the VSD patch and the septal TV attachment More commonly TR is due to annular dilatation secondary to RV enlargement and basal-lateral displacement of the free wall papillary muscles
15 LV dysfunction Normal/mild LV dysfunction Moderate / severe LV dysfunction Ghia et al, JACC 2002
16 Aorta in TOF: Don t forget the aorta in TOF, it can dilate over time Not only the aortic root but try to see as much of the ascending aorta as possible Patient post TOF repair with a dilated aortic root and also dilated ascending aorta with max dilatation at the mid region
17 ECHO assessment of Pulmonary Regurgitation - PR Severity
18 How to assess PR on echo? Haemodynamics of PR Understanding the etiology of the PR PR jet width PR index (PRi) PR pressure half-time Diastolic reversal in branch PA RV dilatation
19 Haemodynamics of PR RIGHT HEART HAEMODYNAMICS IN SEVERE PR Premature TV closure closure (PTC) occurs in mid diastole when RVDP > RAP Premature PV opening (PPVO) occurs when RVEDP > PADP
20 PR
21 SYSTOLE DIASTOLE TR jet
22 Etiology of the PR Reading the surgical op notes is crucial Nearly all TOF patients with trans-annular patch will have some degree of PR Assess for suprapulmonary and branch PA stenosis which may worsen the degree of PR Serial follow up of TOF patients with PR expect the expected look out for the unexpected
23 TOF patient with pulmonary homograft replacement for severe PR 3 years ago - presented with weight loss and fever - not seen dentist for 3 years
24 Look at all echo windows Zoom, playback Correlate with clinical data
25 PR, PR, PR : In adult post repair TOF patients, PR..PR.PR PR often underestimated, use other measurements besides color Doppler Severity of PR cannot be assessed in isolation. Invariably, significant PR will result in RV dilatation and dysfunction Must be a reason for RV dilatation if there is no ASD or TR
26 DOES Pulmonary Regurgitation Matter?
27 Survival Post TOF Repair Early repair by experienced surgeons preferably without RVOT patch (Nollert JACC 1997) Look out for late mortality after 25 years (Nollert JACC 1997) Sudden death and cardiac failure are the most common causes of late mortality (Nollert JACC 1997; Gatzoulis Lancet 2000) Right ventricular dysfunction secondary to pulmonary regurgitation is the most important underlying mechanism (Gatzoulis Lancet 2000)
28 Late Death in Repaired Tetralogy 793 adult pts ( , repair age 8.2 ± 8,time from repair 21.1 ± 8.7 years); 33 pts died (4.2% mortality) 15% 6% 3% 27% N=16 49% SCD CHF Re-operation CAD Non-Cardiac Gatzoulis Lancet 2000 In 15/16, sudden cardiac death (SCD) was the first arrhythmic presentation Arrhythmias => 33 patients non-sustained VT, 16 SCD, 29 new onset Aflutter/AF Association between arrhythmias and Pulmonary Regurgitation
29 How important is Pulmonary Regurgitation? 100 % patients VT SD AF Arrhythmia-free 0 RVSP TR PR (>60mmHg) (> moderate) (> moderate) Gatzoulis Lancet 2000
30 Does Pulmonary Regurgitation matter? Exercise intolerance % peakvo 2 predicted r=-0.4 p< Pulmonary Regurgitation Fraction (%) Davlouros et al EHJ 2002
31 Pulmonary Regurgitation in Pregnancy Impaired RV function +/- pulmonary regurgitation: Independent predictor of adverse maternal events during pregnancy Khairy et al., Circulation 2006
32 How to best assess PR severity?
33 Mild-to-moderate PR seen on echo is common and does not require further follow-up or intervention Significant PR in patients is uncommon and usually follows after childhood surgery for TOF or other congenital lesions The pulmonic valve is rarely involved by IE in the normal population or RHD but is susceptible to carcinoid accretion and results in varying degrees of stenosis and regurgitation.
34 Grading of PR severity remains difficult since standards for quantification of PR are less robust than for AR The vena contracta is probably the most accurate approach In all cases, the experts recommend corroborating the results of these methods with the other available parameters.
35 But is vena contracta really that useful? Shapes of vena contracta on 3D in 18 randomly selected patients with PR complex shapes, cannot have any geometrical asssumptions on the VC ECHOCARDIOGRAPHY, Volume 25, September 2008
36 Echo is the first-line diagnostic technique, providing the assessment of residual RVOTO and PR, residual VSD, RV and LV size and function Significant PR is almost always encountered following a transannular patch repair. Severe chronic PR, eventually leads to symptomatic RV dilation and dysfunction The severity of PR and its deleterious long-term effects are augmented by co-existing distal PA stenoses or PAH (the latter is uncommon)
37 ECHO PARAMETERS for ASSESSING PULMONARY REGURGITATION - PR JET WIDTH
38 PR JET WIDTH Broad, laminar, retrograde diastolic flow on colour Doppler originating at PV level Jet width > 0.98 cm had 90% accuracy of discriminating between those with MRI PRF of more than 24.5% (Li et al, Am Heart J 2004; 147:165-72)
39 PR JET WIDTH Severe or free PR as jet width is as broad as the PV annulus Scroll slowly, stop the frame and measure the max jet width (usually in early diastole) wrt to the PV annulus at the same level The PR jet width / annulus ratio cutoff point for determination of severe PR (>40% PRF) was 0.7 (MD Puchalski et al, Congenit Heart Disease. 2008;3: )
40 ECHO PARAMETERS for ASSESSING PULMONARY REGURGITATION - PR INDEX (PRi)
41 Pulmonary Regurgitation Index (PRi) Severe PR has shorter duration; not valid for stiff RV (Li et al, Am Heart J 2004; 147:165-72)
42 PR index (PRi) = PR duration / time in Diastole PRi = 314 / 529 = 0.60 A PRi 0.77 had 100% sensitivity and 84.6% specificity for identifying patients with pulmonary regurgitant fraction 24.5%, with a predictive accuracy of 95% (Wei Li et al, Am Heart J 2004;147: )
43 ECHO PARAMETERS for ASSESSING PULMONARY REGURGITATION - PR Pressure Half-time
44 Pulmonary Regurgitation Pressure Half-Time PR pressure half-time < 100ms (76% sensitivity and 94% specificity for PRF >20% on MRI, identify PR of moderate to severe degree) in repaired TOF patients (Silversides et al, JASE 2003; 16: )
45 PR Pressure Half-Time Pulmonary pressure half-time < 100 milliseconds was found to be a good indicator of hemodynamically significant regurgitation (Silversides et al, J Am Soc Echocardiogr 2003;16: )
46 Short Deceleration Time in the PR spectral Doppler signal is usually indicative of severe PR (principle behind the P1/2t of <100 ms) This will leave long period of no flow as PR duration is shortened (Hence PR duration/ duration of diastole principle behind PRi of <0.77) Antegrade flow in the latter part of diastole can occur with atrial contraction (Premature PV opening as RV and PA diastolic pressure equilibrates) Caveat: PR P½t and PRi cannot be used when RV is stiff as the RVEDP would already be elevated, affecting the equilibration of RV and PA pressures
47 ECHO PARAMETERS for ASSESSING PULMONARY REGURGITATION - Diastolic Flow Reversal in Branch PA
48 Diastolic Flow Reversal in Branch PA
49 Diastolic reversal in branch PA The best univariate predictor of severe PR was branch pulmonary artery diastolic flow reversal (Renella et al, Journal of the American Society of Echocardiography 2010;23:880-6)
50 PW Doppler at the level of proximal RPA Diastolic flow reversal present in branch PA
51 Mild PR : persistent flow gradient at end-diastole Mod PR: equilibration of pressures between the MPA and RV only at enddiastole Severe PR: Early diastolic pressure equilibration Pattern of diastolic flow reversal at LPA seen with varying degree of PR severity J Am Soc Echocardiogr 2014;27:111-41
52 ECHO PARAMETERS for ASSESSING PULMONARY REGURGITATION - RIGHT VENTRICLE DILATATION
53 Pathophysiology RV dilatation in Chronic PR RV adaptations depends on degree and duration of PR, properties of RV and PAs, presence of branch PA stenosis PR => Increased RVEDV =>RVESV Progressive RV dilatation =>TR=>RV dilates even more + RA dilatation RV dilatation and stretch => slow interventricular conduction, substrate for VT, atrial flutter, etc. Serial increase in QRS duration reflect RV dilatation Restrictive and stiff RV =>conduit for forward pulmonary flow during atrial contraction in late diastole Restrictive RV can limit PR and degree of RV dilatation in short term
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56 Assessment of RV function is an integral part of the echo examination in adult TOF patients with severe PR
57 ESC Guidelines: Recommendation for PVR ESC 2010 Guidelines on management of GUCH : Pulmonary valve replacement (PVRep) and/or relief of RVOTO can be performed with low mortality (<1%) in patients without heart failure and/or advanced ventricular dysfunction Optimal timing remains challenging. Longitudinal data are more important than single measurements to assist timing for re-intervention. Normalization of RV size after re-intervention becomes unlikely as soon as the end-diastolic volume index exceeds 160 ml/m. Distal PA stenosis must be addressed, either at the time of surgery (including intra-operative stenting) or with a percutaneous approach Tissue PVRep seems to have a mean life span of years. There is little experience with mechanical valves in this setting and there is concern about adequate anticoagulation
58 MRI assessment of post op TOF patients
59 CMR for post op TOF patients Important complementary imaging to echo Gold standard for RV assessment in terms of RV volume and function. LGE for fibrosis Quantitative assessment of PR PR fraction Assess main PA and branch PAs residual branch PA stenosis (site and size). MAPCAs Quantify residual shunt Size and extent of aortic dilatation
60 Methods: Global RV function CoV (%) Right Ventricle Left Ventricle InterScan Intraobserver Interoberver InterScan Intraobserver Interoberver Variable Observer 1 Observer 2 Obs1 vs. Obs 2 Observer 1 Observer 2 Obs1 vs Obs 2 EDV MASS ESV SV EF Babu-Narayan, Bouzas et al, JCMR 2005; 7: S-153 S-153
61 Methods: Measurement of PRF systole diastole late diastole flow volume (ml/s) systolic forward flow diastolic reversal late diastolic forward flow -400 trigger delay (ms)
62 MRI Gadolinium enhancement Myocardial fibrosis in repaired TET Babu-Narayan et al Circulation 2006
63 MRI Gadolinium enhancement Myocardial fibrosis in repaired TOF Babu-Narayan et al Circulation 2006
64 MDCT assessment of post op TOF patients
65 MDCT for post op TOF patients Usually not the first or second line investigations because of radiation dose. CMR preferred over MDCT Useful for assessment of coronary arteries in post op adult TOF patients congenital coronary anomalies (origin, course) or CAD in older TOF Assessment pre and post branch PA stenting Aortic dilatation Aortic dissection
66 3D reconstructed CT showing coronary artery course in a post repair TOF patient (above) Widely patent stents in the main PA and branch PAs (right) JASE 2014:27, pg
67 Summary In post repaired adult TOF patients, we need to know exactly what had been done during surgical repair to anticipate any residual lesions and the expected sequelae from the surgery, commonest sequlae encountered is PR Several echo methods are available to assess PR severity. Know the limitations of each method Severe pulmonary regurgitation is not a benign lesion or isolated lesion, look at its effect on RV and the other right sided valve tricuspid valve The degree of RV dilatation and dysfunction is an indirect assessment of the sequlae of chronic significant pulmonary regurgitation The gold standard of RV assessment is with CMR RVEDVi, RVESVi, RVEF, PR fraction and LGE The main aim of echo and CMR imaging in these post op adult TOF patients with PR to guide the timing for PVR
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Candice Silversides, MD Toronto Congenital Cardiac Centre for Adults University of Toronto Toronto, Canada
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