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Biomedical subjects

A E Urban

Publications and source records attributed to A E Urban.

At least 19 recordsLinked to original sources
PubMed2004

[Ventricular septal defect and aortic regurgitation-pathophysiological aspects and therapeutic consequences].

The development of aortic regurgitation (AI) is a rare but serious complication of subaortic ventricular septal defects (VSD). Over a period of 5 years we observed VSD-related AI in 24 patients, a frequency of 4.5% of all isolated VSD's encountered during that time frame. The location of the defects was in the infundibular septum in 59%, it was perimembranous in 25% and in the trabecular septum in 16%. Hemodynamically the defects were small except for 2 where the Q(p)/Q(s) ratio was > 2. Of the 24 pts, 16 had surgical closure of their VSD accompanied in 9 by aortic valvuloplasty. AI was caused by elongation or defect of the right coronary leaflet in 42%, of the noncoronary leaflet in 25% and a combination of both, in 8%. In 6 pts with infundibular VSD absence of part of the aortic valve ring above the defect was the underlying mechanism for AI. Postoperatively AI was improved to moderate in one pt and to none to trivial in 15. LV end-diastolic diameter decreased significantly in all pts operated. Pathogenetic mechanisms for the development of AI are a deficiency in the aorto-infundibular junction with prolaps of the right-or non-coronary leaflet, deficiency of the valve supporting structures including the valve ring as well as suction of the already elongated leaflet into the VSD with further damage to the antiregurgitant mechanism of the semilunar valve at risk. In perimembranous VSD's, late AI is probably related to turbulent flow through the adjacent LVOT. Surgical closure of isolated VSD's with a location immediately beneath the aortic valve is indicated regardless of their size to prevent the development of AI. If AI has occurred, VSD closure including aortic valvuloplasty improves the amount of regurgitation and normalizes LV enddiastolic dimension.

Adolescent↗
PubMed2001

The fate of small-diameter homografts in the pulmonary position.

BACKGROUND: Limited durability is expected for small homograft valves that are used to correct congenital cardiac disease. METHODS: All 76 homograft valves with an internal annulus diameter ranging from 8 to 13 mm that were implanted from 1987 through 2000 in the pulmonary position were retrospectively analyzed. In each case, homograft size was normalized to the patient's body surface area: z-value. For 93% (14 of 15) of the 8 to 9 mm grafts, z was less than 2. For 56% (5 of 9) of the 10 mm grafts and 98% (51 of 52) of the 11 to 13 mm allografts, z was greater than 2. Survival and freedom from complications were estimated by the Kaplan-Meier method. Homograft failure was defined as homograft replacement or late death; significant dysfunction, as homograft obstruction with an echo-Doppler gradient greater than 50 mm Hg or grade III or IV valvular insufficiency. The log-rank test was used to compare outcomes. RESULTS: Seven patients died early after operation; three, late. Survival was 86.5% +/- 3.8% at 1 year and remained stable during the succeeding years. Freedom from failure for all homografts was 90.6% +/- 3.7%, 71.8% +/- 6.9%, and 61.8% +/- 9.0% at 1, 5, and 10 years, respectively. Corresponding freedom from significant dysfunction was 87.6% +/- 4.1%, 51.2% +/- 7.4%, and 10.1% +/- 8.3%. The smaller homografts (z less than 2) failed and deteriorated faster (p < 0.0001): only 32.1% +/- 13.0% were still functioning at 24 months. The larger grafts (z at least 2) retained function for the first 4 years, and 73.7% +/- 10.4% had not yet failed at 10 years. CONCLUSIONS: Smaller (z less than 2) homografts (the great majority of 8 to 9 mm grafts) have to be replaced early, usually within 2 years of implantation. Larger (z at least 2) grafts (nearly all 11 to 13 mm grafts) show remarkable durability and are suitable valved conduits for establishing right ventricle to pulmonary artery continuity in neonates and young infants.

Child↗
PubMed2001

Transposition of the great arteries associated with ventricular septal defect: surgical results and long-term outcome.

OBJECTIVES: To identify potential risk factors influencing early and late outcome following the arterial switch operation (ASO) for transposition of the great arteries associated with ventricular septal defect including double-outlet right or left ventricle. METHODS: All patients who underwent ASO in our department until August 2000 (n=105) were included in this study. There were 77 transpositions of the great arteries with ventricular septal defect, 22 Taussig-Bing hearts and six patients with double-outlet morphology. The median age at operation was 24 days. Aortic arch obstruction was present in 25 patients; in 13 of these patients, a repair with aortic arch reconstruction was done before ASO. The usual coronary artery pattern was present in 59% of the patients. In six patients, we found an intramural course of at least one coronary artery. The ventricular septal defect was closed with a patch through the right atrium (n=35), the aorta (n=25), the pulmonary artery (n=25) or the right ventricle (n=3); in 17 patients a combined approach was necessary. RESULTS: There were five hospital deaths (4.7%, 95% confidence limit 2-11%). The median duration of follow-up was 72 months. Fourteen patients underwent 15 reoperations 33 months after repair (median), eight for right ventricular outflow tract obstruction or neopulmonary stenosis. Four late deaths occurred, two due to complications related to coronary artery anomalies. Statistical analysis revealed no significant risk factor whatsoever correlating with death or need for reoperation. Survival after 12 years was 91.6%, and freedom from reoperation was 82.6%. Latest follow-up data showed that 13% of patients were in NYHA class II and/or required medical treatment; 87% were in NYHA class I. CONCLUSIONS: ASO associated with patch closure of ventricular septal defect can be performed early in life with a low risk of mortality (<5%), low incidence of reintervention (<15%) and promising long-term outcome.

Aortic Coarctation↗
PubMed2000

Closure of the zone of apposition at correction of complete atrioventricular septal defect improves outcome.

OBJECTIVE: Outcome after correction of atrioventricular septal defect depends to a great deal on the postoperative function of the left atrioventricular valve. The related role of the zone of apposition ('cleft') has been debated: should it be closed (bileaflet repair) or should it be left untouched (trileaflet repair)? This study aims to answer the question by comparing the outcome of patients treated according to these two approaches. METHODS: We reviewed all our patients who underwent repair of complete atrioventricular septal defect from 1984 to 1997 and selected those in whom the closure of the zone of apposition in principle would have been possible. Two groups with similar characteristics were constituted: group I (n=63), where the zone of apposition was deliberately not closed as part of a trileaflet repair (postoperative open zone of apposition) and group II (n=96), where it was electively closed as part of a bileaflet AV valve repair (closed zone of apposition). Since we changed from a trileaflet to a bileaflet repair in 1987, the two groups differ in terms of size and length of follow-up. Outcome was compared with regard to survival and freedom from reoperation for left atrioventricular valve incompetence. Late atrioventricular valve function was evaluated by Echo-Doppler. For statistical analysis, we used Chi-square or Fisher's exact test, the Mann-Whitney test and the log-rank test for comparison of Kaplan-Meier curves. The difference was considered statistically significant with a P-value of 0.05 or less. RESULTS: Early mortality was 9.5% (6/63) in group I and 3.1% (3/96) in group II (P=0.16). Actuarial survival after 1, 4 and 8 years was 80.4, 68.4 and 64.8%, respectively, for group I. Actuarial survival for group II was 94.7, 92.1 and 92.1% (P=0.0002). Freedom from reoperation for left atrioventricular valve regurgitation was 90.2, 85.6 and 77.8% for group I at the same time interval. It was a constant 97.9% for group II (P=0.0016). At reoperation, left atrioventricular valve regurgitation was present through the open zone of apposition in 63% of group I cases. The follow-up is 96% (126/131) complete. An increase in degree of left atrioventricular valve incompetence was noted in 28% (11/39) of group I cases and in 9% (8/87) of group II cases (P=0.0131). CONCLUSION: This study demonstrates the advantage of closing the zone of apposition ('cleft') as part of repair of complete atrioventricular septal defect. Survival, freedom from reoperation for left atrioventricular valve incompetence and over-all outcome were more favourable in patients of group II. The zone of apposition should be surgically addressed whenever the morphology of the left atrioventricular valve allows for closure without producing stenosis.

Actuarial Analysis↗
PubMed2000

[Heart surgery under cardiopulmonary bypass during the neonatal period remains a high-risk procedure].

Congenital Heart disease with a poor prognosis has to be operated early but with an acceptable surgical risk and a good chance of survival. The aim of this study was to analyse the indications, the operative mortality and medium-term survival of neonates undergoing cardiac surgery under cardiopulmonary bypass from 1991 to 1998. Three hundred and twenty nine operations were programmed in 326 neonates, 18% (329/1805) of all open heart surgical procedures. Anatomical detransposition of the great arteries was the commonest operation (N = 226). Correction was complete (biventricular) in 97% of cases (317/326). Twenty-eight neonates died. The operative mortality was 8.5%, much higher than that of children of 3 months or over (1.5%; p < 0.0001). There were 8 late deaths, all in the first postoperative year. The overall medium-term survival rate was 88.9 +/- 1.7%. It was 100% after correction of truncus arteriosus without interruption of the aortic arch; 94.2 +/- 1.5% after anatomical detransposition; 85.7 +/- 9.4% after commissurotomy of aortic stenosis; 79.2 +/- 8.3% for all the complex forms of interruption of the aortic arch; 75 +/- 9.7% for total anomalous pulmonary venous drainage and 42.9 +/- 18.7% after the Norwood palliative procedure of hypoplastic left heart syndrome. The authors conclude that early cardiac surgery saves the large majority of neonates suffering from complex congenital cardiac disease with poor prognosis. Survival stabilises one year after the operation. Other techniques or treatments are necessary to lower present surgical risk (8.5%) to that of surgery under cardiopulmonary bypass of children over 3 months of age (1.5%).

Cardiopulmonary Bypass↗
PubMed1999

Atrial isomerism: a surgical experience.

Most publications on atrial isomerism are autopsy or case reports. The authors review 41 consecutive children operated on from 1980 through to 1996 with emphasis on associated cardiac anomalies, surgical procedures and outcome. Left atrial isomerism was present in 23 patients. Interruption of the inferior vena cava (56%), atrio-ventricular septal defect (47%), common atrium (38%) and cor triatriatum sinistrum (30%) were the most common diagnoses. Biventricular repair was achieved in 17 children and total cavo-pulmonary connection in two. Three underwent staged palliation: modified Blalock-Taussig shunt for two and bidirectional Glenn anastomosis for one. The remainder received a cardiac pacemaker. One patient died early after repair. Two underwent reoperation to correct a regurgitant left atrio-ventricular valve: one of these, in another hospital, had peroperative death. Three died later. Actuarial survival rate after repair and total cavo-pulmonary connection that was stabilized after 2 years was 84%. In the 18 children with right atrial isomerism, pulmonary atresia or stenosis predominated (89%) with discordant ventriculo-arterial connection (72%), atrio-ventricular septal defect (72%), 'single' ventricle (55%) and extracardiac total anomalous pulmonary venous drainage (50%). Biventricular repair was achieved in two patients and complete Fontan circulation in eight. The other eight underwent various staged palliative procedures and correction of extracardiac total anomalous pulmonary venous drainage. Five patients died postoperatively: two in our unit after modified Blalock-Taussig shunt and total cavo-pulmonary connection, three in other hospitals after repair (n = 1) and Fontan (n = 2). Five died later. One was lost for review. Survival after repair and Fontan stabilized after 6 months at 49%. In conclusion, the cardiovascular malformations associated with left atrial isomerism can often be successfully corrected. Those accompanying right atrial isomerism usually preclude a biventricular repair, require staged palliation and carry a poor prognosis.

Adolescent↗
PubMed1998

Truncus arteriosus: ten-year experience with homograft repair in neonates and infants.

BACKGROUND: Early complete repair of truncus arteriosus with homograft reconstruction of the right ventricular outflow tract was performed and long-term results were evaluated. METHODS: Review of 46 consecutive patients with truncus arteriosus who underwent primary correction between June 1987 and May 1997 was performed. Ages ranged from 21 days to 7.2 years (median, 62 days) and weights from 1.8 to 21.5 kg (median, 3.4 kg). Ten patients were operated on before 1 month of age, 20 between 1 and 3 months, 13 between 3 months and 1 year, and 3 at an older age. Associated cardiac conditions were encountered frequently, the most common being coronary artery anomalies (n = 16), truncal valve incompetence (n = 12), and interrupted aortic arch (n = 5). The right ventricular outflow tract was reconstructed with an aortic (n = 28) or a pulmonary homograft (n = 18). RESULTS: There were two hospital deaths (4.3%). Both patients had severe truncal valve regurgitation and interrupted aortic arch together with other unfavorable conditions. Survival in uncomplicated truncus arteriosus was 100%. Follow-up was from 3 months to 10 years (mean, 36 months). There was one late death 4 months after the initial repair, presumably because of cardiac reason. Actuarial survival was 93% at 4 months and beyond. Actuarial freedom of reoperation in the 27 hospital survivors with aortic homografts was 43% at 75 months; it was 73% at 62 months in the 17 patients surviving with pulmonary homografts. CONCLUSIONS: Neonatal or early infancy complete repair is the treatment with the best potential for survival. The homograft remains our conduit of choice to establish continuity between the right ventricle and the pulmonary artery. Management of severe truncal valve incompetence remains a surgical challenge.

Actuarial Analysis↗
PubMed1997

[Prolonged endotracheal intubation after open heart surgery under the age of one year].

The aim of this study was to determine the impact of prolonged endotracheal intubation after open heart surgery in neonates and babies with respect to the cardiac diseases most frequently responsible and the reasons for delayed extubation and the related mortality. Intubation was considered to be prolonged if lasting over 48 hours. This was a retrospective study of all cases of open heart surgery performed before one year of age between 1991 and 1996. Prolonged intubation was noted in 43.1% of cases (266/617). The frequency was much higher than in children over 1 year of age: 8.3% (56/725). Truncus arteriosus (93.5%: 29/31), obstructed total anomalous venous drainage (93.3%: 14/15). Taussig-Bing anomaly (83.3%: 5/6), interruption of the aortic arch (78.9%: 15/19), double outlet right ventricle (61.1%: 11/18) and transposition of the great arteries (50.2%: 107/213) were the commonest responsible malformations. The reasons for delayed extubation, often multiple, were established in 222 cases: cardiogenic shock or circulating failure in 155 cases, pulmonary dysfunction in 142 cases, surgical complications in 65 cases and neurological complications in 14 cases. Twelve patients died: 5 of congestive heart failure, 3 of pulmonary hypertension, 2 of septic shock and 1 of diffuse stenosis of the pulmonary veins. The mortality rate was 4.5% (12/266) in cases of prolonged intubation and 5.2% (32/617) for all infants operated during the first year of life. The authors conclude that a large number of infants undergoing open heart surgery undergo prolonged intubation because of their poor preoperative status and the particularly severe effects of cardiopulmonary bypass at this age. However, the associated mortality was low in this series.

Age Factors↗
PubMed1996

Early and long-term results for correction of total anomalous pulmonary venous drainage (TAPVD) in neonates and infants.

OBJECTIVE: To present our 17-year experience of surgical repair of total anomalous pulmonary venous drainage (TAPVD) in 71 consecutive neonates and infants, with particular emphasis on the role of preoperative pulmonary venous obstruction (PVO), the management of postoperative pulmonary hypertensive crises and the long-term results. PATIENTS AND METHODS: From July 1977 to May 1994, 36 newborns and 35 infants, aged between 1 and 300 days, had repair TAPVD in our Department. Fifty-four patients had decompensated heart failure, whereas three were moribund. The anomalous drainage was supracardiac in 32 (45%), cardiac in 17 (24%), infracardiac in 17 (24%) and mixed in 5 infants (7%). Major associated cardiac anomalies coexisted in nine cases. Forty-five (63%) exhibited signs of PVO. The repair was performed under moderate hypothermia in 15 and deep hypothermic arrest in 56 patients. In case of postoperative pulmonary hypertensive crises, artificial hyperventilation with high oxygen concentration, sedation and relaxation, inotropic support and afterload reduction with phentolamine were applied selectively. The actual follow-up is based on functional symptomatology and cardiac echo-doppler studies. RESULTS: Six children (8.5%) died early: four perioperatively, two on the 2nd and 10th postoperative day, respectively. Poor preoperative condition, operation before 1987 and preoperative PVO were the main incremental risk factors for death. No death occurred among the last 38 cases. There were complications in 45 patients, in particular pulmonary hypertensive crises in 27. Two patients died late, after 80 and 118 days, respectively, of progressive intrapulmonary vein fibrosis: the second despite reoperation. The risk of late death approaches zero after 6 months. Among the 63 survivors, 56 (86%) are asymptomatic and without medication, 3 months-17 years after operation. Five have mild symptoms with ordinary physical activity. Two are lost to follow-up. CONCLUSIONS: Early repair of TAPVD with aggressive management of pulmonary hypertensive crises carries low operative mortality nowadays. Preoperative PVO as a risk factor has been neutralized since 1987. Long-term results are gratifying: no late death after 6 months, no reoperation and functional good results. Progressive pulmonary vein fibrosis remains an unpredictable rare cause of death within the 1st year after surgery.

Adolescent↗
PubMed1994

[Surgical repair of common truncus arteriosus with homograft. Short- and mid-term results].

Between July 1987 and July 1993, 25 consecutive children with truncus arteriosus underwent complete surgical correction with homografts. Nineteen were under 6 months of age and 4 had an associated interruption of the aortic arch. Ten pulmonary and fifteen aortic homografts were implanted. They were cryopreserved with the exception of two, fresh aortic homografts. The diameters of the homografts varied from 8 to 19 mms. Two children who had an interruption of the aortic arch, aged 24 and 31 days, died in the peroperative period. The postoperative course was uncomplicated in only 3 cases; 20 patients had complications, including 9 cardiogenic shocks and 8 pulmonary hypertensive crises. The medium-term results included one death 4 months after surgery in an infant with an interruption of the aortic arch, and 2 successful homograft replacements 3 and 12 months after the initial repair for mycotic infection in 1 case and valvular stenosis in the other. The mean follow-up of the other 20 patients was 23 months: 14 were in NYHA functional Class I, 4 are on the waiting list for replacement of their homograft for obstruction after an average period of 47 months. The authors strategy is to perform surgical correction of truncus arteriosus very early: immediately in the neonatal period in cases with uncontrollable cardiac failure, at 6 months at the latest. Small homografts make this aggressive attitude feasible, but with an operative mortality in the first 6 months of life of 10.5% (2/19).(ABSTRACT TRUNCATED AT 250 WORDS)

Aortic Valve↗
PubMed1991

The arterial switch repair and the obstructive right ventricular outflow tract: does it matter?

Right ventricular outflow tract obstruction (RVOTO) was resected in 5 of 78 neonates (6.4%) with complete transposition of the great arteries (TGA) and in 10 of 26 neonates and infants (38.5%) with double outlet right ventricle (DORV) or TGA associated with ventricular septal defect (VSD). The early mortality in the combined series was 7.7%. Morphologic indicators for RVOTO in TGA are abnormal spatial relations of the great arteries, abnormal coronary anatomy, small size of the aortic valve ring, hypoplasia or obstruction of the aortic arch and the presence of a malaligned VSD. Sizing of the RVOT and the aortic valve annulus should confirm the diagnosis and establish the indication for resection. Right ventricular outflow tract obstruction is important for the outcome of arterial switch operation (ASO) in neonates and infants with simple and complex TGA: if subaortic obstruction is anticipated and properly dealt with, the surgical risk of anatomic correction is not increased.

Double Outlet Right Ventricle↗
PubMed1991

Atrioventricular septal defects. Analysis of short- and medium-term results.

Atrioventricular septal defects were repaired in 87 patients from 1981 to 1988. Interventricular communications were present in 73 patients, and major associated anomalies were present in 17 (tetralogy of Fallot in four, double-outlet right ventricle in two, multiple ventricular septal defects in 11). Five deaths occurred in the hospital (5.7%; 70% confidence limits, 3.2% to 9.7%). A preoperative New York Heart Association class V functional condition was the only incremental risk factor (p = 0.02) for death in the hospital. No patient (0%; 70% confidence limits, 0% to 2.15%) had complete heart block. Actuarial survival rate at 80 months was 81.4%. The only incremental risk factor (p = 0.005) leading to reoperation was a preoperative valve incompetence. Actuarial rate at 80 months for freedom from reoperation was 84.2% in the overall group of patients after repair of atrioventricular septal defect. We conclude that an improvement in survival and success rates should be found when a policy of earlier repair is followed.

Actuarial Analysis↗
PubMed1990

Prenatal diagnosis of aortic atresia by colour Doppler flow mapping.

A case of aortic atresia with insufficiency of mitral valve diagnosed prenatally at 33 weeks of gestation is presented. An accurate diagnosis of this fetal cardiovascular malformation was possible by application of Doppler colour flow mapping, which demonstrated (a) the absence of forward flow in the hypoplastic ascending aorta, (b) reverse flow of blood from the ductus arteriosus into the severely hypoplastic ascending aorta in the late systole, (c) pansystolic mitral valve regurgitation, and (d) absent flow across the foramen ovale as a result of premature closure of the foramen ovale.

Adult↗
PubMed1990

Total correction of complete atrioventricular canal: surgical technique and analysis of long-term results.

Surgery for total correction of complete AVC can be done with low early and late mortality. The operative risk is high only in patients who reach the operating room in a near moribund condition (NYHA V). There is clinical evidence that early operation - before the onset of pulmonary vascular disease - will further lower early and late mortality. The surgical technique has been refined to avoid late reoperation for left atrioventricular valve incompetence. The early and late results of operative therapy compare favourably with the natural history of this complex congenital cardiac disease.

Cardiac Surgical Procedures↗
PubMed1984

Aprotinin in open-heart surgery of infants and children using the heart-lung machine.

The purpose of this study was to evaluate a new approach to managing thrombohemorrhagic diathesis in infants and children undergoing extracorporeal circulation during open-heart surgery. Treatment consisted of administering vitamin K1 and aprotinin preoperatively as well as during bypass and after neutralization of heparin. Operative techniques were either surface-induced deep hypothermia and total circulating arrest or conventional bypass with mild-to-moderate hypothermia. At completion of the intracardiac repair, heparin was neutralized with protamine chloride (1:0.7-0.8). Complete bleeding and clotting studies were carried out in 122 patients before, during, and after the bypass procedure. Most of the infants, especially those with congenital cyanotic heart disease, had marked fibrinolysis and vitamin K1 deficiency preoperatively. All patients postoperatively exhibited fibrinolysis and proteolysis greatly exceeding normal values with increased bleeding tendency. The treatment significantly reduced blood loss and transfusion requirements.

Aprotinin↗
PubMed1977

Double outlet left ventricle associated with situs inversus and atrioventricular concordance.

A case is described in which the ventriculo-arterial connection of double-outlet left ventricle was associated with situs inversus and atrioventricular concordance. The case additionally exhibited l-malposition of the aorta, a subaortic ventricular septal defect, and valvar and subvalvar pulmonary stenosis. Originally diagnosed as transposition of the great arteries, a Rastelli type correction was attempted. This was not successful, owing to hypoplasia of the morphological tricuspid valve orifice.

Autopsy↗