Number 18-05: How to image the heart when it is in the abdomen: A case of pentalogy of Cantrell
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number 18-05: HOW TO IMAGE THE HEART WHEN IT IS IN THE ABDOMEN: A CASE OF PENTALOGY OF CANTRELL

Jennifer Gerardin, MD and Anurag Sahu, MD Emory University, Atlanta, Georgia, USA

Clinical history:  A 40-year-old man with pentalogy of Cantrell including omphalocele, epicordis with ventral herniation into the abdominal cavity, chest wall deformities, and congenital heart disease presented to our adult congenital heart disease clinic with lower extremity swelling.  His complex congenital heart disease consisted of double outlet right ventricle (DORV) with D-malposition of the great arteries, severe left pulmonary artery stenosis, severe pulmonary insufficiency, cor triatrium sinister and ventricular herniation into the abdominal cavity. In infancy, he underwent classic Blalock Tausig (BT) shunt (suggesting that pulmonary blood flow must have been severely limited by pulmonary stenosis) and closure of skin over the abdominal portion of the heart. He had a second classic BT shunt at 2 years old which was followed by a final shunt revision at 6 years old. He subsequently underwent a baffle closure of the ventricular septal defect creating an outlet from the left ventricle to the aorta, which was situated anatomically above the right ventricle. This is typically combined with a conduit from the right ventricle to the pulmonary artery performed at 8 years of age.  This combination of procedures is often referred to as a 'Rastelli procedure' developed by Italian physician and cardiac surgery researcher, Giancarlo Rastelli in 1967 at the Mayo Clinic. 

At 18 years old, the patient had his final intervention which was the closure of a residual atrial septal defect. When he transitioned to adult care, he was followed by general adult cardiology for more than 10 years. The patient presented to our adult congenital cardiology clinic with significant lower extremity edema and abdominal fullness. On physical exam, his ventricles were seen beating directly under his skin.  Also, 4+ lower extremity swelling and significant hepatosplenomegaly were noted. The initial transthoracic echocardiogram was limited due to the orientation of his heart but interestingly showed a possible incidental but unobstructed cor-triatriatum sinister (video 1). Cardiac magnetic resonance (CMR) was performed to determine his anatomy and assess the right ventricle.  

 

Video 1. Echocardiogram showing mild mitral regurgitation. There is a suspicion of a narrowing in the left atrium suggesting cor triatriatum but this is seen better in the the CMR images (video 3 and figure 2)

 

CMR findings

CMR imaging revealed that the heart was located in the right hemithorax and the apex pointing to the left, although there is eventration of the diaphragm with both the left and right mid to apical portions of the ventricles lying in the abdominal cavity (this segment does not have the anterior protection of the sternum cavity, and is directly beneath the skin). Ventricular cavities are just anterior to the liver. There are features of double outlet of right ventricle with d-malposition of great arteries with aorta anterior and to the right of pulmonary artery. The main pulmonary artery and right pulmonary artery are severely dilated, but the left pulmonary artery is severely stenotic. CMR confirmed the unobstructed cor-triatriatum sinister. Figures 1-4. Illustrate the anatomy above. These images were created from a SSFP respiratory navigated 3D dataset. LA – Left atrium, RA – Right atrium, Ao – Aorta, LV – Left ventricle, RV – Right ventricle, CT - cor-triatriatum sinister, IVC – inferior vena cava, PA – pulmonary artery. The 3D dataset was used to plan the SSFP cines.

  

Figure 1. These images were created from a SSFP respiratory navigated 3D dataset. LA – Left atrium, RA – Right atrium, Ao – Aorta, LV – Left ventricle. The 3D dataset was used to plan the SSFP cines (see video 2)

 


Figure 2. These images were created from a SSFP respiratory navigated 3D dataset. LA – Left atrium, RA – Right atrium, LV – Left ventricle, RV – Right ventricle, CT is the pulmonary venous confluence portion of the LA divided from the rest of the LA by an unobstructive membrane which forms a cor triatriatum (literally heart with 'three atria', seen in this image - LA, RA and CT). The 3D dataset was used to plan the SSFP cines (see video 3)

 


Figure 3. These images were created from a SSFP respiratory navigated 3D dataset. 'Rastelli Patch' is shown here. Ao – Aorta, LV – Left ventricle, RV – Right ventricle, CT - cor-triatriatum sinister. The 3D dataset was used to plan the SSFP cines (see video 4)

 


Figure 4. These images were created from a SSFP respiratory navigated 3D dataset. LA – Left atrium, RA – Right atrium, RV – Right ventricle, IVC – inferior vena cava, PA – pulmonary artery. The 3D dataset was used to plan the SSFP cines (see video 5)

The VCD-gated and respiratory-navigated 3D balanced SSFP single cardiac rest phase imaging shown above was extremely helpful to define the anatomy. It is also helpful in complex cases to define standard planes for cine imaging as in this case. Segmented balanced SSFP cine imaging complemented this anatomical assessment and provided simultaneous functional assessment. Video 2 shows the position of the heart in the abdomen. Delayed enhancement imaging showed no foci of delayed myocardial enhancement to suggest scar/fibrosis in the left or right ventricle. 

  

Video 2. A VLA SSFP cine shows the left atrium, mitral valve and the left ventricle. At the base of the heart, the left ventricle (LV) turns ninety degrees downward and the rest of the LV (the mid to apical portion) subsequently lies in the abdominal cavity. The ventricle is anterior to the liver. (See figure 1 for additional labeling of structures)

Due to the severe pulmonary insufficiency, right ventricle enlargement and reduced RV systolic function (Table 1, videos 3-5), he was referred for a pulmonary valve replacement. 


Video 3. HLA SSFP image shows the presence of nonobstructive cor-triatriatum sinister. Normal left ventricular  cavity size with mildly depressed systolic function (a calculated ejection fraction is 46%). The right ventricle is severely dilated. Right ventricular end diastolic volume indexed is 187 mL/m2. The systolic function is moderately depressed systolic function with a calculated ejection fraction is 37%. (See figure 2 for additional labeling of structures)

 


Video 4.  3-Chamber SSFP cine illustrates that the aorta previously originated from the morphological right ventricle but the outflow is now committed to the left ventricle via the intraventricular baffled closure of the ventricular septal defect ('The Rastelli  procedure'). There is no evidence of subaortic obstruction. (See figure 3 for additional labeling of structures)

 

Video 5.  RV inflow outflow SSFP cine demonstrates the pulmonary valve is absent with subsequent free pulmonary regurgitation. Phase contrast the pulmonary regurgitant fraction was 41%. (See figure 4 below for labels of structures)

 

Video 6 (3D reconstruction) demonstrates the severe left pulmonary artery (LPA) stenosis and the right pulmonary artery (RPA) dilation. A trans-catheter valve without pulmonary artery intervention was felt to be his safest option as the first procedure due to his severe restrictive lung disease and thrombocytopenia. 


Video 6.   3-D reconstruction of the right heart and branch pulmonary arteries shows severe left pulmonary artery stenosis and dilation of the main pulmonary artery and right pulmonary artery. The main pulmonary artery measures 4.9 cm x 3.9 cm and right pulmonary artery measures 3 cm x 3.4 cm while the left pulmonary artery only measures proximally 1.1 cm x 0.5 cm. The flow differential between the branch pulmonary artery is 68% flow to right pulmonary artery and 32% flow to the left pulmonary artery. (See also figure 5)

 


Video 7.   3-D reconstruction of the heart and major organs from 3d SSFP images. This give an overview of the morphology of the heart, in relation to abdominal organs (spleen and kidneys shown)

 

 

Left ventricle

Right ventricle

End diastolic volume index (ml/m2)

91

187

End systolic volume index (ml/m2)

49

119




Ejection fraction (%) 46

37

Table 1. Left and right ventricular indices at presentation.

 

The pre- and post-procedure angiogram is shown in video 8. The patient has done well since then. He has not had further palpitations, the lower extremity edema has almost resolved, the amount of diuretics have been decreased, and his NYHA functional class has decreased from 3 to 2.

 

Video 8.   Pre-procedure angiogram showing free pulmonary regurgitation (left) compared to Post-procedure trans-catheter pulmonary valve insertion showing no significant regurgitation or stenosis (right) 

    

Conclusion

For adult congenital heart disease patients that have gaps in their congenital heart disease care or lack of knowledge of their surgical repairs, CMR is essential in determining complex cardiac anatomy and for interventional planning. In this case, CMR illustrated the need for pulmonary valve replacement in order to improve his right ventricle size and function. It quantitatively showed a severely enlarged right ventricle (RV end diastolic volume 187 ml/m2) and depressed RV systolic function (RVEF = 37%.) (table 1). Severe pulmonary regurgitation is the most common cause of the severe right ventricular dilation and decreased function in the adult congenital heart disease population. The phase contrast imaging demonstrated severe pulmonary regurgitation with a regurgitant fraction of 41%. Although the accurate assessment of right ventricular volume and function was useful, the 3D datasets from the respiratory navigator SSFP sequence and the cardiac MRA were essential in determining if he was a candidate for surgical or catheter based interventions since his cardiac anatomy spanned both the thorax and abdomen.  

Perspective

Pentalogy of Cantrell is an extremely rare congenital anomaly with an incidence 1 per 65,000 live births. Pentalogy of Cantrell includes: omphalocele, congenital heart disease, defect in the pericardium, diaphragm and sternum which may present as ectopia cordis.[i]  At the time of this patient’s birth, there was very high infant mortality (50%) with pentalogy of Cantrell in association with complex congenital heart disease.[ii] To our knowledge, he is the oldest living patient with Pentalogy of Cantrell. Most of the reported adult cases of Cantrell’s Syndrome only report a ventricular diverticulum into the abdomen but are not associated with congenital heart disease.[iii] Conotruncal defects are the most common type of reported congenital heart disease with pentalogy of Cantrell.[iv] Double outlet right ventricle falls in this spectrum.

As survival continues to improve with congenital heart disease, these complex patients will become more common.[v] Similar to our patient, many adult patients with congenital heart disease will have gaps in congenital heart disease care.[vi] When these patients present for adult care, it is important to refer them back to adult congenital centers.  In cases where advance imaging is needed, it is recommended that centers have imagers who are trained in both CMR and congenital heart disease.[vii]


 

Click here to view the CMR images.

 

Case prepared by SCMR Case of the Week Associate Editor: Tarique Hussain, MD, PhD, UT Southwestern

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