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    Matthias Freund

    Aims Stenting has become an established interventional cardiology procedure for congenital heart disease. Although most stent procedures are completed successfully, complications may occur. This mul-ticentre study evaluated early... more
    Aims Stenting has become an established interventional cardiology procedure for congenital heart disease. Although most stent procedures are completed successfully, complications may occur. This mul-ticentre study evaluated early complications after stenting in patients with congenital heart disease, including potential risk factors. Methods and results In this combined Dutch–Belgian retrospective study, 309 consecutive patients had undergone 366 catheterizations and received 464 stents in 13 different anatomical positions (418 sites). Seventy-two stenting-related complications (19%) occurred, of which 24 (5.7%) were major. Seven procedure-related deaths were documented (2.3%). Stent malpositioning and embolization were most common (7.7%). The use of non-premounted stents tended to be associated with higher complication rates. Centre inexperience with stenting and stenting of native vs. post-surgical stenosis tended to be associated with increased major complication rates. Conclusio...
    A 4-year-old, male, neutered cat was referred because of recurrent episodes of dyspnea. Physical examination revealed a harsh systolic murmur, with the point of maximal intensity in the left heart base, with an intensity of 4 out of 6.... more
    A 4-year-old, male, neutered cat was referred because of recurrent episodes of dyspnea. Physical examination revealed a harsh systolic murmur, with the point of maximal intensity in the left heart base, with an intensity of 4 out of 6. Echocardiographic diagnosis was severe supravalvular pulmonary artery stenosis. A selective right ventricular angiocardiogram showed an absence of arterial blood flow to the left lung lobes. A balloon dilatation of the localized stenosis of the right pulmonary artery was attempted with cardiac catheterization. However, when the catheter was passed through the stenosis, the blood flow to the lungs temporarily completely ceased, which led to death. Postmortem examination revealed a circumscribed stenosis of both pulmonary arteries at the site of the bifurcation, where the ligamentum arteriosum was attached. Histopathology showed that the localized ridge-like stenosis at the pulmonary artery bifurcation was caused by connective tissue. The suspected caus...
    OBJECTIVESIn hypoplastic left heart complex patients, biventricular repair is preferred over staged-single ventricle palliation; however, there are too few studies to support either strategy. Therefore, we retrospectively characterized... more
    OBJECTIVESIn hypoplastic left heart complex patients, biventricular repair is preferred over staged-single ventricle palliation; however, there are too few studies to support either strategy. Therefore, we retrospectively characterized our patient cohort with hypoplastic left heart complex after biventricular repair to measure left-sided heart structures and assess our treatment strategy.METHODSPatients with hypoplastic left heart complex who had biventricular repair between 2004 and 2018 were retrospectively reviewed. Operative results were evaluated and echocardiographic mitral valve (MV) and aortic valve (AoV) dimensions, left ventricular length and left ventricular internal diastolic diameter (LVIDd) were measured preoperatively and during follow-up after 0.5, 1, 3, 5 and 10 years.RESULTSIn 32 patients, the median age at surgery was 10 (interquartile range 5.0) days. The median follow-up was 6.19 (interquartile range 6.04) years. During the 10-year follow-up, the mean Z-scores i...
    Hypertrophic cardiomyopathy (HCM) in neonates is a rare and heterogeneous disorder which is characterized by hypertrophy of heart with histological and functional disruption of the myocardial structure/composition. The prognosis of HCM... more
    Hypertrophic cardiomyopathy (HCM) in neonates is a rare and heterogeneous disorder which is characterized by hypertrophy of heart with histological and functional disruption of the myocardial structure/composition. The prognosis of HCM depends on the underlying diagnosis. In this review, we emphasize the importance to consider hyperinsulinism in the differential diagnosis of HCM, as hyperinsulinism is widely associated with cardiac hypertrophy (CH) which cannot be distinguished from HCM on echocardiographic examination. We supply an overview of the incidence and treatment strategies of neonatal CH in a broad spectrum of hyperinsulinemic diseases. Reviewing the literature, we found that CH is reported in 13 to 44% of infants of diabetic mothers, in approximately 40% of infants with congenital hyperinsulinism, in 61% of infants with leprechaunism and in 48 to 61% of the patients with congenital generalized lipodystrophy. The correct diagnosis is of importance since there is a large va...
    Congenitally unguarded morphologically tricuspid valvar orifice is a rare abnormality, usually associated with pulmonary atresia. We describe such a case found in association with discordant atrioventricular and ventriculoarterial... more
    Congenitally unguarded morphologically tricuspid valvar orifice is a rare abnormality, usually associated with pulmonary atresia. We describe such a case found in association with discordant atrioventricular and ventriculoarterial connections in which the aortic valve was atretic. Presentation was with respiratory distress due to severe cardiac failure after birth. Echocardiography demonstrated a dilated systemic ventricle with poor function, left atrial enlargement, and aortic atresia. The clinical findings were confirmed at autopsy.
    The authors present a patient and describe other cases from the literature which demonstrate that prolonged use of nasogastric tubes can result in life-threatening aortoesophageal fistula formation in patients with a double aortic arch.... more
    The authors present a patient and describe other cases from the literature which demonstrate that prolonged use of nasogastric tubes can result in life-threatening aortoesophageal fistula formation in patients with a double aortic arch. Aortoesophageal fistula (AEF) is an abnormal communication between the esophagus and the aorta. It can cause massive gastrointestinal hemorrhage. We present an infant with an operatively corrected double aortic arch, who developed this complication after prolonged nasogastric intubation.
    In August 2010, the Nit-Occlud(®) Lê (EUREVECO) became available for transcatheter coil occlusion of ventricular septal defects (VSDs). Retrospective European Registry for VSD Closure using the Nit-Occlud(®) Lê-VSD-Coil; analysis of the... more
    In August 2010, the Nit-Occlud(®) Lê (EUREVECO) became available for transcatheter coil occlusion of ventricular septal defects (VSDs). Retrospective European Registry for VSD Closure using the Nit-Occlud(®) Lê-VSD-Coil; analysis of the feasibility, results, safety and follow-up of VSD-closure over a 3-year period in 18 European centers. In 102 of 111 patients (female 66), successful VSD closure was performed (mean age 8.2 years, mean weight 28.82 kg), 81 perimembranous VSDs (48 with aneurysm), 30 muscular VSDs, mean procedure time was 121.1 min, and mean fluoroscopy time was 26.3 min. Short- and midterm term follow-up was possible in 100/102 patients, there was 1 embolization and 1 explantation after 24 months. Immediate complete closure occurred in 49 of 101 patients (48.5%), trivial residual shunt was present in 51 (50.0%), closure rate was 95% after 6 months and 97% after 1 year. Out of the 102 patients, there were 2 severe complications (1.8%) (1 severe hemolysis, 1 embolizatio...
    In neonates with hypoplastic left heart complex (HLHC), biventricular repair is considered superior to univentricular repair. The Z-scores of the mitral and the aortic valve annulus are primary factors for the choice of repair. Predictive... more
    In neonates with hypoplastic left heart complex (HLHC), biventricular repair is considered superior to univentricular repair. The Z-scores of the mitral and the aortic valve annulus are primary factors for the choice of repair. Predictive cutoff values for the feasibility and optimal outcome of biventricular repair are unknown. This study assesses the growth of left side heart structures and the midterm outcome after biventricular repair with an interatrial fenestration in our HLHC population. Retrospective study of 19 HLHC patients who underwent biventricular repair in a single tertiary referral center between 2004 and 2013. The cardiac dimensions (mitral and aortic valve annulus, left ventricle inlet length, left ventricular internal diastolic dimension) were measured before and at 6, 12, 24, and 48 months after biventricular repair. The follow-up ranged from 2 to 98 months. There was no early mortality, and the midterm survival rate was 95%. One patient died of a noncardiac- and ...
    A congenital coronary cameral fistula (CCCF) is characterized by left ventricular dysfunction, electrocardiographic changes due to a reduced left coronary blood flow and impaired physical activity.... more
    A congenital coronary cameral fistula (CCCF) is characterized by left ventricular dysfunction, electrocardiographic changes due to a reduced left coronary blood flow and impaired physical activity. CCCF's with a giant aneurysm are very rarely seen. The presence of a giant aneurysm imposes even greater health risks. We report a case of a CCCF from the left coronary artery to the right ventricle with a large distal aneurysm in a 20-year-old woman that we closed percutaneously with coils for the closure of ventricular septal defects (VSD) and persistent ductus arteriosus (PDA).
    The authors present a patient and describe other cases from the literature which demonstrate that prolonged use of nasogastric tubes can result in life-threatening aortoesophageal fistula formation in patients with a double aortic arch.... more
    The authors present a patient and describe other cases from the literature which demonstrate that prolonged use of nasogastric tubes can result in life-threatening aortoesophageal fistula formation in patients with a double aortic arch. Aortoesophageal fistula (AEF) is an abnormal communication between the esophagus and the aorta. It can cause massive gastrointestinal hemorrhage. We present an infant with an operatively corrected double aortic arch, who developed this complication after prolonged nasogastric intubation.