Publications
Below you can find a list of our published research.
Below you can find a list of our published research.
253 results
Cited 4 times since 2002 (0.2 per year) source: EuropePMC
The Journal of thoracic and cardiovascular surgery, Volume 123, Issue 2, 1 1 2002, Pages 348-349 Quadricuspid aortic valve in transposition of the great arteries. Portela FA, Hazekamp MG, Bartelings MM, Gittenberger-De Groot AC
Netherlands heart journal : monthly journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation, Volume 9, Issue 7, 1 1 2001, Pages 267-268 Pulmonary valve insertion late after repair of Fallot's tetralogy. Vliegen HW, Hazekamp MG
Cited 7 times since 2001 (0.3 per year) source: EuropePMC
The Journal of thoracic and cardiovascular surgery, Volume 122, Issue 3, 1 1 2001, Pages 449-456 Prime solutions for cardiopulmonary bypass in neonates: antioxidant capacity of prime based on albumin or fresh frozen plasma. Molicki JS, Draaisma AM, Verbeet N, Munneke R, Huysmans HA, Hazekamp MG, Berger HM
Objective: Oxidative damage and inflammation are believed to play an important role in postoperative complications after cardiopulmonary bypass. During bypass, a prime solution with a high antioxidant capacity may reduce the oxidative damage and inflammation. We investigated total antioxidant capacity and individual scavengers during the preparation of 2 different prime solutions. Methods: The prime solutions were prepared with either pasteurized human albumin or fresh frozen plasma. The total a... Abstract
Cited 45 times since 2001 (2 per year) source: EuropePMC
Pediatric cardiology, Volume 22, Issue 4, 1 1 2001, Pages 321-326 Acute renal insufficiency and renal replacement therapy after pediatric cardiopulmonary bypass surgery. Kist-van Holthe tot Echten JE, Goedvolk CA, Doornaar MB, van der Vorst MM, Bosman-Vermeeren JM, Brand R, van der Heijden AJ, Schoof PH, Hazekamp MG
The aim of the study was to investigate renal function and renal replacement therapy after cardiopulmonary bypass surgery in children. Patient characteristics (sex, age, diagnosis), operation type, and death were listed. The study was performed retrospectively using serum creatinine level before, and peak values after, cardiopulmonary bypass surgery for assessment of renal function. Of the children on renal replacement therapy, indication, efficacy, and complications were recorded. In a 5-year p... Abstract
Cited 28 times since 2001 (1.2 per year) source: EuropePMC
Radiology, Volume 219, Issue 3, 1 1 2001, Pages 637-643 Aortic valve replacement in patients with aortic valve stenosis improves myocardial metabolism and diastolic function. Beyerbacht HP, Lamb HJ, van Der Laarse A, Vliegen HW, Leujes F, Hazekamp MG, de Roos A, van Der Wall EE
Purpose: To evaluate whether functional and metabolic changes recover after aortic valve replacement (AVR). Materials and methods: Eighteen men with aortic valve stenosis (mean pressure gradient +/- SD, 79.9 mm Hg +/- 15.1) underwent magnetic resonance (MR) imaging and phosphorus 31 MR spectroscopy. In nine patients who underwent AVR, MR imaging and spectroscopy were repeated 40 weeks +/- 12 after AVR. Ten age-matched healthy men were control subjects. Results: Before AVR, the myocardial phospho... Abstract
Cited 46 times since 2001 (2 per year) source: EuropePMC
European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery, Volume 19, Issue 5, 1 1 2001, Pages 667-670 Pulmonary valve insertion late after repair of Fallot's tetralogy. Hazekamp MG, Kurvers MM, Schoof PH, Vliegen HW, Mulder BM, Roest AA, Ottenkamp J, Dion RA
Objectives: To analyze the results of pulmonary valve insertion late after initial repair of Fallot's tetralogy. Pulmonary insufficiency (PI) after correction of Fallot's tetralogy is usually well tolerated in the short term, but is associated with symptomatic right ventricular dilatation and an increased risk of ventricular arrhythmias over longer periods of time. Methods: From 1993 to July 2000, 51 patients were reoperated for PI at a mean age of 25.7+/-11.9 years. The mean age at in... Abstract
Cited 5 times since 2001 (0.2 per year) source: EuropePMC
The Annals of thoracic surgery, Volume 71, Issue 4, 1 1 2001, Pages 1382-1383 Implantation of cardioverter device in young children: the perirenal approach. Hazekamp MG, Blom NA, Schoof PH, Schalij MJ, Dion RA
Placement of Implantable cardioverter devices in young children is complicated because of the relatively large size and heavy weight of these devices. A technique is described where the device is implanted in the left perirenal space while an endovascular lead is used instead of an epicardial patch electrode. Abstract
Cited 13 times since 2001 (0.6 per year) source: EuropePMC
The Annals of thoracic surgery, Volume 71, Issue 2, 1 1 2001, Pages 601-7; discussion 607-8 Outcome and follow-up of aortic valve replacement with the freestyle stentless bioprosthesis. Kappetein AP, Braun J, Baur LH, Prat A, Peels K, Hazekamp MG, Schoof PH, Huysmans HA
Background: The aim of this study was to determine the morbidity, mortality, and hemodynamics after implantation of the Freestyle stentless bioprosthesis in the aortic position. Methods: A total of 280 patients were operated on from June 1993 to July 1999 as part of a multicenter investigation. Factors influencing hospital mortality and long-term survival were assessed by logistic regression and Cox proportional hazards analysis. Patients were evaluated postoperatively at discharge, at 3 to 6 mo... Abstract
Cited 19 times since 2000 (0.8 per year) source: EuropePMC
The Journal of thoracic and cardiovascular surgery, Volume 120, Issue 1, 1 1 2000, Pages 55-65 Remodeling of the porcine pulmonary autograft wall in the aortic position. Schoof PH, Gittenberger-De Groot AC, De Heer E, Bruijn JA, Hazekamp MG, Huysmans HA
Objective: Dilatation and valve regurgitation are disturbing sequelae of the pulmonary root functioning at systemic pressures. We tried to characterize the histologic mode of adaptation of the neoaortic wall. Methods: We compared routine histologic studies, immunohistochemical staining, and computer-assisted morphometric analysis of aortic, pulmonary autograft, and native pulmonary wall specimens from pigs in which, as a newborn, a valveless pulmonary autograft had been implanted in the aorta. R... Abstract
Cited 14 times since 2000 (0.6 per year) source: EuropePMC
Magnetic resonance imaging, Volume 18, Issue 3, 1 1 2000, Pages 245-253 Spin echo MRI in the evaluation of hearts with a double outlet right ventricle: usefulness and limitations. Beekmana RP, Roest AA, Helbing WA, Hazekamp MG, Schoof PH, Bartelings MM, Sobotka MA, de Roos A, Ottenkamp J
The surgical approach to a double outlet right ventricle (DORV) is dependent on the spatial relationship of the semilunar valves, outflow tracts and ventricular septal defect (VSD). The purpose of the study was to assess the value of MRI for the evaluation of cardiovascular anatomy in patients before and after surgery for DORV. Spin echo MRI was performed in 12 patients with DORV (eight preoperative and four postoperative patients). Thin-section MRI was performed in three orthogonal planes and s... Abstract
Cited 4 times since 1999 (0.2 per year) source: EuropePMC
Seminars in thoracic and cardiovascular surgery, Volume 11, Issue 4 Suppl 1, 1 1 1999, Pages 133-138 Dehiscence of the Freestyle stentless bioprosthesis. Schoof PH, Baur LH, Kappetein AP, Hazekamp MG, van Rijk-Zwikker GL, Huysmans HA
This study aimed to identify and characterize patients who developed prosthetic dehiscence after aortic valve replacement with the Freestyle Stentless bioprosthesis. Review of patients' records and preoperative echocardiogram was performed. Prosthetic dehiscence developed in 10 patients after 2.5 to 49 months (mean 19). Most patients were symptomatic at presentation. Nine patients were reoperated. Dehiscence was typically located at the inflow suture line beneath the noncoronary cusp. Four... Abstract
Cited 6 times since 1999 (0.2 per year) source: EuropePMC
Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography, Volume 12, Issue 9, 1 1 1999, Pages 729-735 Echocardiographic parameters of the freestyle stentless bioprosthesis in aortic position: the European experience. Baur LH, Jin XY, Houdas Y, Peels CH, Braun J, Kappetein AP, Prat A, Hazekamp MG, Van Straten BH, Ploeg A, Sieders A, Voogd PJ, Bruschke AV, van der Wall EE, Westaby S, Huysmans HA
The objective of this study was to determine normal Doppler and 2-dimensional characteristics of the Freestyle stentless aortic bioprosthesis. The Freestyle aortic bioprosthesis is a new type of aortic xenograft, and experience is limited. We therefore determined the normal range of echocardiographic and Doppler examinations of this valve. Three hundred thirty-nine consecutive patients with a Freestyle aortic bioprosthesis underwent an echocardiographic and Doppler examination according to a com... Abstract
Cited 32 times since 1999 (1.3 per year) source: EuropePMC
The Journal of thoracic and cardiovascular surgery, Volume 118, Issue 2, 1 1 1999, Pages 252-258 Brom's three-patch technique for repair of supravalvular aortic stenosis. Hazekamp MG, Kappetein AP, Schoof PH, Ottenkamp J, Witsenburg M, Huysmans HA, Bogers AJ
Objective: Case histories of all patients (n = 29) operated on for supravalvular aortic stenosis from 1962 to the present were reviewed to study different techniques and outcomes. The technique of symmetric aortoplasty with 3 patches (1 in each sinus) is described and compared with other methods. Methods: Case reports were reviewed and follow-up was completed by contacting the patient's (pediatric) cardiologist. We aimed for a last follow-up visit, including Doppler echocardiographic studie... Abstract
International journal of cardiac imaging, Volume 15, Issue 3, 1 1 1999, Pages 209-214 Dynamic obstruction, an unusual complication after aortic valve replacement with a stentless porcine valve. van Roosmalen RP, Baur LH, Braun J, Atsma DE, Hazekamp MG, van der Wall EE, Huysmans HA
In the early nineties, the stentless porcine aortic bioprosthesis has been reintroduced successfully. Because of the limited experience, knowledge of clinical complications is limited. Therefore, we describe an unusual complication of dynamic obstruction after aortic valve replacement with a stentless porcine valve in a 70 year old man 18 months after implantation. We discuss the complications of stentless aortic prostheses known so far, describe operative techniques used and their characteristi... Abstract
Cited 39 times since 1999 (1.5 per year) source: EuropePMC
The American journal of cardiology, Volume 83, Issue 4, 1 1 1999, Pages 558-562 Postsurgical course of patients with congenitally corrected transposition of the great arteries. Voskuil M, Hazekamp MG, Kroft LJ, Lubbers WJ, Ottenkamp J, van der Wall EE, Zwinderman KH, Mulder BJ
Because congenitally corrected transposition is a rare congenital anomaly, little is known about the prognosis of patients with this syndrome. The present study evaluated the functional status and clinical course of 73 patients (42 male and 31 female) aged 10 days to 73 years. Follow-up was 1 week to 37 years (mean 12.7 years). Particular attention was paid to the systemic right ventricle, considering the current controversies about long-term right ventricular function. Survival of patients with... Abstract
Cited 18 times since 1998 (0.7 per year) source: EuropePMC
The Annals of thoracic surgery, Volume 66, Issue 6 Suppl, 1 1 1998, Pages S225-32 Tissue chimerism in human cryopreserved homograft valve explants demonstrated by in situ hybridization. Koolbergen DR, Hazekamp MG, Kurvers M, de Heer E, Cornelisse CJ, Huysmans HA, Bruijn JA
Background: The presence of viable cells may contribute to increased homograft valve durability. These cells may be of infiltrating recipient or persisting donor origin. In this study, in situ hybridization was used to assess the origin of cells in cryopreserved homograft valve explants. Methods: A total of 10 homografts with a donor-recipient gender mismatch were acquired from patients whose graft had been explanted at reoperation or at autopsy. The period of implantation varied from 14 days to... Abstract
Cited 1 times since 1998 (0 per year) source: EuropePMC
The Journal of heart valve disease, Volume 7, Issue 6, 1 1 1998, Pages 615-619 Short-term follow up of the Ross operation in children. Braun J, Hazekamp MG, Schoof PH, Ottenkamp J, Huysmans HA
Background and aims of the study: Aortic valve disease in the pediatric population poses special problems to surgeons and cardiologists. The pulmonary autograft has proven to be a good alternative for aortic valve replacement and left ventricular outflow tract (LVOT) reconstruction in this special group. Methods: Forty-one children (mean age 10.0 +/- 4.8 (SD) years; range: 35 days to 18.8 years) underwent aortic root replacement with a pulmonary autograft between February 1994 and April 1998. Tw... Abstract
Cited 11 times since 1998 (0.4 per year) source: EuropePMC
The Journal of heart valve disease, Volume 7, Issue 4, 1 1 1998, Pages 407-409 Autologous pericardium for ventricular septal defect closure. Schoof PH, Hazekamp MG, van Ulzen K, Bartelings MM, Bruyn JA, Helbing W, Huysmans HA
Background and aims of the study: The use of living, untreated autologous pericardium for patch repair in the left ventricular outflow tract was considered attractive in children. Methods: Ventricular septal defect (VSD) closure with an untreated autologous pericardial patch was performed in 102 children of mean age 13.4 months (range: 1 to 73 months). Postoperative transthoracic Doppler echocardiography was performed in all children at a mean of nine weeks (range: one day to 50 weeks) after sur... Abstract
Cited 14 times since 1998 (0.5 per year) source: EuropePMC
The Journal of thoracic and cardiovascular surgery, Volume 115, Issue 6, 1 1 1998, Pages 1264-1272 Disproportionate enlargement of the pulmonary autograft in the aortic position in the growing pig. Schoof PH, Hazekamp MG, van Wermeskerken GK, de Heer E, Bruijn JA, Gittenberger-de Groot AC, Huysmans HA
Purpose: This study was aimed to demonstrate growth in the pulmonary autograft after transplantation to the aortic position. Methods and materials: In 20 piglets (weight 25.4 +/- 3.5 kg) (mean +/- standard deviation) a Ross operation was performed and in five piglets (weight 9.3 +/- 0.7 kg) (mean +/- standard deviation) the ascending aorta was replaced with a valveless pulmonary autograft. Animals were allowed to grow as much as possible. Postmortem explanted autografts were studied by direct me... Abstract
Cited 9 times since 1998 (0.3 per year) source: EuropePMC
The Annals of thoracic surgery, Volume 65, Issue 6, 1 1 1998, Pages 1726-1729 Pulmonary root replacement with the Freestyle stentless aortic xenograft in growing pigs. Schoof PH, Hazekamp MG, van Krieken HH, Huysmans HA
Background: The stentless xenograft with its favorable hemodynamic performance on the left side of the heart seems an attractive, readily available alternative for the reconstruction of the right ventricular outflow tract in children. Methods: To assess its function in a preclinical animal investigation, we replaced the pulmonary root with a Freestyle stentless aortic xenograft in 18 piglets of 26.6 +/- 3.2 kg weight. The animals were allowed to grow as much as possible and slaughtered when symp... Abstract