The Genesis stent: A new low-profile stent for use in infants, children, and adults with congenital heart disease

Placement of intravascular stents that can reach adult size in infants and smaller children has been limited by the large profile and poor flexibility of currently available stents. In vitro and in vivo testing of the Genesis stent was performed to evaluate crimpability, predeployment flexibility, and radial strength. Comparisons were made to the Palmaz iliac and IntraStent (IS) LD stents. Nine physicians placed 30 Genesis stents in swine pulmonary and systemic arteries to evaluate stent deliverability/crimpability. Two swine were recovered and underwent a second catheterization 8 weeks later, where the stents (n = 8) were reexpanded to maximal size. Angiographic and intravascular ultrasound (IVUS) assessments were performed. In vitro testing revealed the Genesis stent to have superior crimpability, flexibility, and comparable radial strength to the Palmaz iliac stent, and superior crimpability and radial strength and comparable flexibility to the IS LD series. During in vivo testing, the physicians graded the Genesis stent superior to the Palmaz stent regarding crimpability and deliverability, and superior to the IS LD stent in regard to crimpability, and comparable to or superior in deliverability. In the chronic animals, the Genesis stent was expanded up to maximal diameter 8 weeks following implantation. Angiographic and IVUS revealed no fractures no in-stent restenosis. The Genesis stent can be easily delivered through smaller sheaths, which will facilitate their use in infants and smaller children with vascular stenosis. Cathet Cardiovasc Intervent 2003;59:406–414. © 2003 Wiley-Liss, Inc.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/35255/1/10547_ftp.pd

Intermediate follow-up following intravascular stenting for treatment of coarctation of the aorta

Background : We report a multiinstitutional study on intermediate-term outcome of intravascular stenting for treatment of coarctation of the aorta using integrated arch imaging (IAI) techniques. Methods and Results : Medical records of 578 patients from 17 institutions were reviewed. A total of 588 procedures were performed between May 1989 and Aug 2005. About 27% (160/588) procedures were followed up by further IAI of their aorta (MRI/CT/repeat cardiac catheterization) after initial stent procedures. Abnormal imaging studies included: the presence of dissection or aneurysm formation, stent fracture, or the presence of reobstruction within the stent (instent restenosis or significant intimal build-up within the stent). Forty-one abnormal imaging studies were reported in the intermediate follow-up at median 12 months (0.5–92 months). Smaller postintervention of the aorta (CoA) diameter and an increased persistent systolic pressure gradient were associated with encountering abnormal follow-up imaging studies. Aortic wall abnormalities included dissections ( n = 5) and aneurysm ( n = 13). The risk of encountering aortic wall abnormalities increased with larger percent increase in CoA diameter poststent implant, increasing balloon/coarc ratio, and performing prestent angioplasty. Stent restenosis was observed in 5/6 parts encountering stent fracture and neointimal buildup ( n = 16). Small CoA diameter poststent implant and increased poststent residual pressure gradient increased the likelihood of encountering instent restenosis at intermediate follow-up. Conclusions : Abnormalities were observed at intermediate follow-up following IS placement for treatment of native and recurrent coarctation of the aorta. Not exceeding a balloon:coarctation ratio of 3.5 and avoidance of prestent angioplasty decreased the likelihood of encountering an abnormal follow-up imaging study in patients undergoing intravascular stent placement for the treatment of coarctation of the aorta. We recommend IAI for all patients undergoing IS placement for treatment of CoA. © 2007 Wiley-Liss, Inc.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/57392/1/21191_ftp.pd

Superior outcomes for repair in infants and neonates with tetralogy of Fallot with absent pulmonary valve syndrome

ObjectivePrimary repair of tetralogy of Fallot with absent pulmonary valve syndrome has been associated with significant mortality, particularly for neonates in respiratory distress. Controversy persists regarding the method of establishing right ventricle–pulmonary artery continuity.MethodsAnatomic and demographic parameters were evaluated for patients undergoing repair of tetralogy of Fallot with absent pulmonary valve syndrome from 1990 to 2005, as were perioperative and late postoperative parameters (airway complications, reoperation or catheter-based intervention, and mortality).ResultsTwenty-three patients underwent repair. Median age was 15 days (range 2-1154 days). Patients were followed up for 5.3 ± 3.9 years. Seventeen (85%) required preoperative ventilatory assistance. One patient died within 24 hours; 1 patient died 8 months postoperatively. Four patients received valved homografts, and the remainder had valveless connections. All patients underwent reduction pulmonary arterioplasty and mobilization, unifocalization (in 3), and ventricular septal defect closure. Valveless connection recipients had a transannular hood. No patient underwent a Lecompte maneuver. Four patients underwent reoperation for conversion to valveless connection (n = 1), reduction arterioplasty (n = 1), and repair of pulmonary stenosis (n = 2). Three patients required catheter-based intervention, with balloon angioplasty (n = 3) and stent placement (n = 1); 2 now demonstrate equal quantitative lung perfusion. No patient has had significant debility from airway compromise. All patients demonstrate free pulmonary insufficiency and good biventricular function.ConclusionsWe report excellent overall survival (89%) and low postoperative morbidity for neonates and infants undergoing primary repair of tetralogy of Fallot with absent pulmonary valve syndrome. Our recent experience supports the use of a valveless right ventricle–pulmonary artery connection, which, combined with catheter-based intervention, reduces the likelihood of reoperation necessitated by homograft placement