PubMed Health⌕ Search

Biomedical subjects

M G Massad

Publications and source records attributed to M G Massad.

At least 19 recordsLinked to original sources
PubMed2004

Surgery for aortic arch thrombosis.

A localized thrombus involving the ascending aorta and arch rarely occurs in the absence of an underlying etiology such as chest trauma, atherosclerosis, a hypercoagulable state or instrumentation. A review of the literature between 1966 - 2003 yielded 38 reported cases of localized aortic arch thrombi, 21 of which were treated by surgical excision of the thrombus using different approaches. In this communication, we describe this clinical entity, with its diagnosis and management. The technical details that are important to ensure the safe conduct of the procedure are discussed.

Aorta, Thoracic↗
PubMed2001

Progressive functional adaptation of segmental bowel graft from living related donor.

We report a patient with short gut syndrome successfully treated with living related bowel transplantation. A 27-year-old Caucasian man was referred after traumatic loss of almost the entire bowel from the third portion of duodenum to the sigmoid colon. His HLA-identical sister volunteered as a donor. A 200-cm segment of ileum was successfully transplanted under tacrolimus-based immunosuppression. The posttransplant course was uneventful, without rejection or infectious complication. Total parenteral nutrition was discontinued 1 week posttransplant. At 6 months the patient had returned to his preinjury weight. Water and D-xylose absorption as well as fecal fat studies were markedly abnormal 1 month posttransplant but normalized by 6 months. The donor recovery was uneventful. A well-matched segmental ileal graft from living donor can provide complete rehabilitation for patients with short gut syndrome. We documented a progressive functional adaptation of the ileal graft, resulting in normal absorption by 5 months posttransplantation.

Adult↗
PubMed2001

Dysphagia caused by a fetus-in-fetu in a 27-year-old man.

Mechanical obstruction of the distal esophagus by a fetus-in-fetu is an extremely rare condition that has not been previously reported. We present the case of a 27-year-old man who presented with dysphagia caused by fetus-in-fetu contained within a retroperitoneal cystic cavity. The tumor, noticed since childhood, did not cause any symptoms until a year before presentation when symptoms of dysphagia developed. We propose including this entity in the differential diagnosis of a retroperitoneal mass.

Adult↗
PubMed2001

Pulmonary venous drainage into the left atrial appendage facilitates transplantation of the left lung with difficult exposure.

Heterotopic implantation of the pulmonary venous confluence into the left atrial appendage during left lung transplantation is a reasonable alternative technique to reestablish venous drainage when exposure of the native left pulmonary veno-atrial connection may be problematic. We used this approach in a 39-year-old woman with chronic bronchiectasis who underwent bilateral sequential lung transplantation through a clam-shell approach. Dense hilar scarring and a small left atrial size made exposure of the native left pulmonary veno-atrial connection difficult.

Adult↗
PubMed2001

Closed chest hypothermic circulatory arrest for complex intracranial aneurysms.

BACKGROUND: Recent advances in techniques of cardiopulmonary bypass permitted hypothermic circulatory arrest (HCA) using groin cannulation with the chest closed (CC-HCA) and without direct access to the heart. Herein we describe our experience with this technique for complex intracranial aneurysms. METHODS: Between 1992 and 1999, 16 patients (4 men and 12 women) with a mean age of 52 years (range 32 to 61 years) with complex intracranial aneurysms underwent resection or clipping of their aneurysms at our institution using the technique of CC-HCA and groin cannulation. Groin access was obtained with 16F to 19F arterial and 18F to 20F venous cannulas placing the tips at the aortoiliac and atriocaval junctions, respectively. Patients were cooled to a nasopharyngeal temperature of 16 degrees C. RESULTS: Mean circulatory arrest time was 32 minutes. No patient required conversion to standard sternotomy and central cannulation. There were no intraoperative deaths. The 30-day hospital mortality was 2 of 16 patients (12%). Of the 14 surviving patients (88%), 1 developed bilateral third nerve palsy and another left hemiparesis that improved on follow-up. Both were discharged to an extended care facility and continued to do well at home after discharge. Two patients developed deep venous thrombosis postoperatively and required anticoagulation. All patients continued to do well at a mean follow-up of 42 months. CONCLUSIONS: The less invasive technique of CC-HCA through groin cannulation avoids complications associated with a sternotomy, is safe and is associated with little morbidity, reduced operative time, and early hospital discharge and rehabilitation.

Adult↗
PubMed2001

Replacement of degenerated mitral and aortic bioprostheses without explantation.

BACKGROUND: The most common indication for reoperation in patients with a bioprosthetic valve is primary tissue failure. Explantation of the bioprosthesis is time consuming, and for a mitral valve, may be complicated by cardiac rupture at the atrioventricular junction or the posterior left ventricular wall where a strut is imbedded, injury to the circumflex artery, and late perivalvular leak; for an aortic valve, annular disruption and perivalvular leak may complicate explantation. A new approach to simplify these procedures and avoid these complications, by excising only the bioprosthetic tissue and attaching a bileaflet mechanical valve to the intact stent, was developed in 1991 and was evaluated over a 9-year period in 50 patients who had had one (34), two (10), three (4), or four (2) previous open cardiac operations. METHODS: Since 1991, we have replaced degenerated mitral bioprostheses in 34 patients (25 to 84 years of age; 12 male, 22 female) by preserving the stent and suturing a St. Jude or Carbomedics bileaflet valve to the atrial side of the bioprosthetic cuff; the mitral valve was exposed through a median sternotomy in 21 patients and through a right anterolateral thoracotomy in 13. Using a similar approach, starting in 1995, 16 additional patients (55 to 73 years of age; 11 male, 5 female) with degenerated aortic bioprostheses had the aortic valve replaced by excising the bioprosthetic tissue and amputating the struts, then suturing a Carbomedics valve to the aortic side of the bioprosthetic cuff. This allows the use of a bileaflet valve similar in size to the bioprosthesis with exact matching of the orifices. RESULTS: Bypass time averaged 61 +/- 14 minutes and aortic cross-clamp time 43 +/- 12 minutes. There has been no operative mortality. Three late deaths occurred at 9, 37, and 58 months, and were not valve related. No gradients of hemodynamic significance have been detected on transesophageal echocardiographic follow-up. CONCLUSIONS: Leaving the bioprosthetic cuff intact eliminates the need for extensive dissection, thus shortening and simplifying the procedure and diminishing its attendant mortality and morbidity. This valve-on-valve approach also allows replacement of a degenerated bioprosthesis with a bileaflet valve of comparable size rather than a smaller one jammed into the orifice of the bioprosthetic stent, thus avoiding undue trauma to the bileaflet valve and maintaining excellent hemodynamic function.

Adult↗
PubMed2000

Technique for commissural alignment of the arterial trunks during orthotopic heart transplantation.

Twisting, buckling, and stretching of the pulmonary artery due to faulty alignment or disproportionately long arterial trunks are known technical complications during orthotopic heart transplantation. Failure to recognize these potentially lethal problems intraoperatively may lead to acute ventricular distention and failure. We describe a technique for alignment of the arterial trunks during orthotopic heart transplantation based on the constant commissural orientation of the aortic and pulmonary valves.

Heart Transplantation↗
PubMed2000

Pneumothorax necessitans presenting as a presternal pneumothoracocele.

A 31-year-old woman who is an intravenous drug abuser developed sternoclavicular joint infection with mediastinal and subcutaneous tissue abscesses that communicated through an erosion in the manubrium caused by osteomyelitis. Air entrapment from a subsequent apical pneumothorax formed a localized anterior "pneumothoracocele." We referred to this condition as "pneumothorax necessitans," and we suggest including it in the differential diagnosis of anterior chest wall masses.

Abscess↗
PubMed2000

A 32-year experience in 100 patients with giant paraesophageal hernia: the case for abdominal approach and selective antireflux repair.

BACKGROUND: Giant paraesophageal hiatal hernia (GPEH) presents a risk of catastrophic complications that include massive bleeding, strangulation, and perforation and should be repaired. Controversy persists as to the surgical approach and whether an antireflux repair is required. METHODS: This study reviews the experience with 100 patients with GPEH who underwent surgical repair between 1967 and 1999. Eighty patients underwent an elective operation, and 20 patients underwent an emergency procedure for complications of GPEH. The gastroesophageal junction was above the hiatus ("combined" hernia with sliding component) in 23 patients and in the abdomen in 77 patients, including 3 patients with a true parahiatal hernia. RESULTS: A thoracic approach was used in 18 patients, mostly early in our experience; postoperative gastric volvulus requiring transabdominal repair developed in 2 patients. The remaining 82 patients underwent an abdominal repair, with temporary gastrostomy to prevent gastric displacement in 75 patients; the hernial sac was resected, and the hiatus was reconstructed in all of the patients. Thirty-five patients with reflux on preoperative work up underwent a fundoplication, with gastroplasty in 2 patients because of a short esophagus. No patient has experienced hernia recurrence. Whereas symptomatic relief was excellent in all patients with elective repair, mild reflux was present in 2 patients after emergency operation. There were no deaths among the patients who underwent elective operation; there were 2 hospital deaths among those patients who underwent emergency operation (10%). CONCLUSIONS: GPEH should be repaired soon after recognition. Reflux should be evaluated before the operation, and if present, fundoplication should be part of the repair along with the reduction of the hernia, excision of the sac, gastropexy, and crural closure. These are best achieved with an abdominal approach.

Abdomen↗
PubMed1999

Successful living related simultaneous pancreas-kidney transplant between identical twins.

Simultaneous pancreas-kidney transplant from living donors has been recently proposed as an effective therapeutic option in selected uremic patients with type I diabetes. We report the first simultaneous pancreas-kidney transplant performed between identical twins. Posttransplant, the recipient has been maintained on low dose cyclosporine to avoid recurrent auto-immune insulitis. At the 1-year follow-up, both donor and recipient are well with normal renal function and excellent glucose control. Simultaneous pancreas-kidney transplant between identical twins can be performed successfully using cyclosporine to prevent recurrent auto-immune insulitis.

Adult↗
PubMed1999

Immune-deficient bronchiectasis associated with X-linked lymphoproliferative disease.

Bronchiectasis may occur with various congenital and acquired immunodeficiency diseases. The association of bronchiectasis and the X-linked lymphoproliferative disease (XLP), also known as Duncan's disease is unknown. We describe the case of a 39-year-old man with XLP, the oldest surviving, who developed chronic bronchiectasis with hemoptysis and required a pneumonectomy to control his symptoms.

Adult↗
PubMed1999

Is the presence of surgically treatable coronary artery disease a contraindication to liver transplantation?

Advanced coronary artery disease has been traditionally considered an absolute contraindication to orthotopic liver transplantation where chronic liver failure significantly increases the surgical risk for coronary artery bypass grafting. Performing a simultaneous coronary artery bypass grafting and liver transplant is a theoretically attractive strategy in liver transplant candidates with coronary artery disease in need of revascularization. In the present article, we report a successful simultaneous coronary artery bypass grafting and orthotopic liver transplant with 1-yr post-operative follow-up and we discuss the rationale for this approach. In selected cases, the presence of advanced coronary artery disease should not be considered an absolute contraindication to liver transplantation.

Carcinoma, Hepatocellular↗
PubMed1999

Rejection pattern of simultaneously transplanted cardiac and skeletal muscle grafts in a rat model.

BACKGROUND: We studied the correlation of cardiac and skeletal muscle allograft rejection in a rat model to assess the feasibility of using biopsies from simultaneously transplanted skeletal muscle for surveillance of cardiac graft rejection. METHODS: Thirty Lewis rats (RT1l)) underwent simultaneous heterotopic heart and cutaneous maximus flap (HHCM) allotransplant. Seven recipient rats (control) received syngeneic HHCM grafts from Lewis donors while the remaining 23 (study group) received HHCM grafts from Brown Norway (RT1n) donors. Control rats were sacrificed after 7 days while rats in the study group were serially sacrificed at days 1-7 after transplantation. No immunosuppression was given. The tissue sections from the HHCM grafts were assessed for acute rejection based on the grading system adopted by the International Society for Heart and Lung Transplantation. RESULTS: As expected, all the control rats had no evidence of rejection. One study animal developed an infection in the skeletal muscle allograft and was excluded. Two study animals had no evidence of rejection when sacrificed 1 day after transplant. The remaining 20 rats developed acute cellular rejection in their graft(s). Upon comparison of acute cellular rejection between the heterotopic heart and the cutaneous maximus flap grafts, rejection correlated grade for grade in 75% (15 of 20 rats). All five rats that did not have identical grades of rejection had mild rejection (grades IA, IB and II). Presence or absence of rejection, therefore, correlated in 20/22 rats: 15/20 rats with cardiac rejection and 2/2 rats without cardiac rejection. CONCLUSION: Cardiac and skeletal muscle allografts have similar pattern of rejection with little grade to grade variability. The clinical implications for surveillance of cardiac rejection warrants further investigation.

Animals↗
PubMed1998

Combined coronary bypass and liver transplantation: technical considerations.

Combined coronary artery bypass grafting and orthotopic liver transplantation was carried out successfully in a 58-year-old man with angina pectoris and end-stage liver disease. To date, only 2 similar cases have been documented worldwide whereby the transplantation was performed either during cardiopulmonary bypass or with femoral-to-axillary venovenous bypass initiated at the termination of cardiopulmonary bypass. In this report we describe our experience with a simplified one-exposure approach for the combined operation using cardiopulmonary bypass in tandem with percutaneous femoral-to-right atrial venovenous bypass.

Angina Pectoris↗
PubMed1998

Risk factors for death after heart transplantation: does a single-center experience correlate with multicenter registries?

BACKGROUND: Risk factors for death after heart transplantation (Tx) are frequently documented from multicenter registries. Although this information is helpful, it reflects a whole range of experiences and results, and may not translate to a particular center. This study was performed to (1) evaluate pre-Tx factors affecting mortality in a single-center experience, and (2) compare these factors with risk factors obtained from multicenter registry reports. METHODS: Review of our transplant database between January 1984 and December 1995 identified 405 adults who received a primary heart Tx. Multiple factors were analyzed, including demographics, Tx era, cytomegalovirus status, United Network for Organ Sharing status of recipient, presence of pulmonary hypertension, previous cardiac operations, mechanical ventilation or circulatory support, ischemia time, number of rejection episodes, and preoperative flow cytometry crossmatching. RESULTS: One- and 5-year survival rates were 87.8% and 73.4%, respectively (Kaplan-Meier). Contrary to multicenter registry reports, our data indicate that reoperative procedures, left ventricular assist device support, increasing donor and recipient age, and ischemia time up to 4.2 hours are not risk factors for death after Tx. Likewise, mode of donor death is not a risk factor affecting outcome. Significant risk factors for mortality identified by multivariate analysis included early transplant era (1984 to 1989; p = 0.002), female donor (p = 0.042), cytomegalovirus-seropositive donor (p = 0.048), high pulmonary vascular resistance (p = 0.018), and intraaortic balloon pump support (p = 0.03). It also identified a positive B-cell flow cytometry crossmatch (p = 0.015) to be a risk factor with univariate analysis. CONCLUSIONS: Our data identify a group of recipients, reportedly at high risk in multicenter registries, who are not at increased risk of death after Tx. This information supports the growing experience with older donors and recipients and with bridged transplants, and has allowed us to expand our donor pool. These prognostic factors at evaluation allow more liberal selection of patients and donors for transplantation.

Adolescent↗