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Biomedical subjects

J P Goldstein

Publications and source records attributed to J P Goldstein.

At least 19 recordsLinked to original sources

Coronary artery bypass grafting in a patient with HIV.

We report a successful case of a conventional coronary artery bypass operation performed in a patient with HIV infection and severe three-vessel coronary artery disease. The signal change in outcome of HIV disease, in addition to the reported evidence for accelerated atherosclerosis caused by the disease itself and by its treatment with protease inhibitors, is likely to produce a larger population of HIV-infected patients developing premature coronary artery disease for whom cardiac surgery will be required. Surgical risk, outcome and operative team risk are discussed.

Cardiopulmonary Bypass↗

Association of a Cor Triatriatum Sinister and a right partial anomalous pulmonary venous return. A case report.

A 56-day old baby girl referred for recurrent respiratory tract infections and stridor, showed a rare association of a Cor Triatriatum Sinister (CTS) and a right Partial Anomalous Pulmonary Venous Return (PAPVR), in the form of a stenosed Scimitar vein, draining the right pulmonary veins to the subdiaphragmatic inferior vena cava (IVC), on echography and angiography. The baby underwent successful surgical repair of the CTS, by resection of the obstructive false membrane and reconnection of the Scimitar vein to the left atrium. At the age of 5 years, the child is doing well without any evidence of obstruction on the right or the left pulmonary venous drainage.

Abnormalities, Multiple↗

Redo valve surgery nowadays: what have we learned?

Re-operative valvular surgery is common nowadays. Increased mortality and morbidity are generally associated. Re-operations in cardiac surgery are technically more difficult because of adhesions and a more advanced cardiac status of the patient. Results reported 20 years ago carried a high mortality risk. Experience and technological evolution have produced a substantial reduction in postoperative mortality nowadays. The present review focuses on historical results of redo valve surgery, risks factors for postoperative mortality, technical progress and surgical strategies contributing to better results.

Heart Valve Diseases↗

Tracheobronchial compression of vascular origin. Review of experience in infants and children.

BACKGROUND: Tracheobronchial compression of vascular origin is an uncommon but important cause of respiratory distress in infants and children. We reviewed our surgical experience with 31 children, presenting vascular tracheobronchial compression. METHODS: Thirty-one children, with a median age of seven months, were operated on for airway and/or oesophageal compression secondary to vascular anomalies. Diagnostic findings, mainly established by bronchoscopy and angiography, revealed several pathologic disorders such as right aortic arch with aortic diverticulum in 10, double aortic arch in five, innominate artery compression in six, arteria lusoria in four, and pulmonary artery sling in one patient. Five children developed tracheobronchial compression after previous repair of a complex congenital heart disease. Clinical symptoms on admission were dominantly stridor, recurrent airway infection, dyspnea, respiratory distress and upper digestive complaints such as dysphagia and gastroesophageal reflux. RESULTS: Surgical relief was successful in 30 patients. Only one child with palliated tetralogy of Fallot and pulmonary artery sling died because of intractable extensive tracheobronchial stenosis. Late follow-up over three to 90 months showed a symptom-free evolution in most patients, including one reoperation for recurrent compression and one late death. CONCLUSIONS: Tracheobronchial compression by vascular structures in childhood is uncommon and may be masked by nonspecific respiratory symptoms, resulting in an often delayed diagnosis. Once imaging studies have clearly delineated the causal pathologic vascular structures, surgical correction is often straightforward and effective, in spite of the common presence of tracheobronchial malacia.

Airway Obstruction↗

Traumatic pseudoaneurysm of the abdominal aorta.

A traumatic pseudoaneurysm of the abdominal aorta is a rare entity, occurring as the result of a missed aortic lesion at the time of the initial injury. Therefore, clinical suspicion and careful abdominal exploration at first laparotomy is mandatory to prevent aortic pseudoaneurysm formation and its risk of delayed rupture. We present a case of successful surgical treatment of a suprarenal aortic false aneurysm, presenting 4 weeks after a life-threatening gunshot wound in a 13-year-old child.

Abdominal Injuries↗

Combined repair of upper sternal cleft and tetralogy of Fallot in an infant.

We report on a 2-month-old infant with the unusual association of an upper sternal defect and tetralogy of Fallot. Surgical correction of the cardiac disease consisted of closing the ventricular septal defect and relief of the right ventricular outflow tract by infundibuloplasty. The already less compliant bony thorax of the infant made direct approximation of the upper sternal defect only possible with adjuvant bilateral chondrotomies. Sternal cleft repair is advised during the very first weeks of life, during which complete correction of the rarely associated tetralogy of Fallot can be successfully performed.

Female↗

Nonvalved homografts of thoracic aorta in operation for complex congenital cardiac disease.

BACKGROUND: In contrast to the wide and successful use of valved aortic and pulmonary homografts, the non-valved prolongation of the thoracic aorta for the repair of some complex congenital heart diseases has rarely been described. We present here our experience with the use of descending aorta and aortic arch homografts as non-valved conduits for the surgical repair of complex cardiac malformations in 8 patients. METHODS: One atriopulmonary conduit replacement four extraatrial cavopulmonary connections, and one intraatrial cavopulmonary repair were achieved by means of a homograft of the descending aorta with a diameter of 15 to 17 mm. Three pulmonary unifocalization procedures were carried out in 2 more patients using a curved homograft of the aortic arch with a diameter of 18 mm. Except for 1 patient, whose incompetent common atrioventricular valve was replaced with a mechanical prosthesis, all other patients were managed without anticoagulation. RESULTS: No conduit-related complications were seen during a follow-up of 18 to 42 months. One patient died perioperatively during an emergency central repair of the right ventricular outflow tract after bilateral unifocalization with arch homografts. Another patient died suddenly 4 months after cavopulmonary connection. The remaining 6 patients are currently doing well. CONCLUSIONS: Regardless of the complexity of the underlying malformations, we are encouraged to use nonvalved thoracic aortic homografts in the repair of congenital cardiac diseases because of the reduction in thrombotic, hemorrhagic, and infectious complications associated with their use; convenience in handling; and their versatility in size and shape.

Adolescent↗

[Traumatic rupture of the isthmus of the thoracic aorta (midterm results in a series of 15 cases)].

The authors present a series of 15 cases of traumatic disruption of the aortic isthmus. There were 9 cases of acute rupture and 6 of chronic rupture. All the patients have been operated on. Different technics was used to protect the viscera during aortic cross-clamping, partial E.C.C. in 9 cases, clamp-repair technic in 4 cases and a GOTT shunt in 2 cases. 4 patients died in the first thirty days (3 acute and 1 chronic). 2 cases of paraplegia was observed. All the patients have been reviewed after a mean follow-up of 36 months and remain well but one who is still paraplegic. Surgical repair is mandatory in acute and aortic disruption with a great attention to the associated injuries.

Accidents, Traffic↗

[Functional non-invasive cardio-respiratory evaluation a month and a year after orthotopic heart transplantation].

Cardio-respiratory stress tests of 14 patients, performed one month and one year after orthotopic heart transplant, are compared in order to demonstrate the functional and metabolic improvements of their adaptation to stress. At maximal stress, we note a 33 p. cent increase of the oxygen consumption (p 0.001), an 11 p. cent increase of the heart rate (p 0.025) and an 18 p. cent increase of the systolic arterial pressure (p 0.005). Respiratory quotients and respiratory equivalent for oxygen are significantly lower (p 0.008) while there was no significant variation of ventilation/minute, respiratory rate, and the normal capacity. At the sub-maximal level, the only significant differences observed are the decrease of the respiratory quotient (p 0.01), the ventilation/minute (p 0.025), the respiratory equivalent for oxygen (p 0.005) and the respiratory rate (p 0.03). The improvement of the physical condition observed in heart transplants seems related to a better peripheral adaptation to stress (lower respiratory quotients, reflection of the decreased demand on anaerobic metabolism) permitting a lesser demand on the ventilatory response to stress.

Adult↗

The importance of load-independent analysis in assessment of the inotropic effect of prostaglandin E1 in vivo.

Load-independent pressure-dimension analysis was applied in 13 open-chest, anesthetized dogs during either left atrial (n = 7) or right atrial (n = 6) infusion of prostaglandin E1. Right atrial infusion of prostaglandin E1 in doses from 31 to 500 ng/kg/min resulted in no change in any parameters studied, including mean arterial pressure, cardiac output, and systemic and pulmonary vascular resistances. Left atrial infusion of prostaglandin E1 produced dose-dependent reductions in mean arterial pressure and systemic vascular resistance but no change in the slope of the relationship of left ventricular stroke work to end-diastolic length, a load-independent index of ventricular performance. In contrast to findings obtained with load-dependent parameters, these results suggest that prostaglandin E1 has no positive inotropic effect in vivo.

Animals↗

Quantification of the contractile response to injury: assessment of the work-length relationship in the intact heart.

We used a sonomicrometric determination of ventricular dimension to examine the effect of ischemia and reperfusion on the work-length relationship in the intact heart to develop a useful and precise variable of ventricular contractile response to injury. Twenty anesthetized dogs were instrumented with epicardial ultrasonic dimension transducers to record right ventricular free wall chord length and left ventricular minor-axis length, micromanometers to record ventricular pressures, and an electromagnetic probe to record pulmonary arterial (n = 8) or aortic (n = 7) flow. Dogs were subjected to either 20 min (n = 7) or 30 min (n = 13) of global cardiac ischemia supported by cardiopulmonary bypass. Data were acquired over a range of end-diastolic volumes produced by transient (5 to 10 sec) vena caval occlusion before and after ischemia. In both ventricles, systolic epicardial dimensional shortening correlated with flow probe-measured stroke volume (mean r = .969) and regional stroke work calculated as the integral of instantaneous ventricular pressure and epicardial dimension correlated with measured global stroke work (mean r = .960), confirming the validity of dimensional measurements. Regression analysis demonstrated a highly linear relationship between calculated regional stroke work and end-diastolic length in the right ventricle (mean r = .973) and left ventricle (mean r = .967), quantifiable by a slope (Mw) and x intercept (Lw). Change in afterload produced by pulmonary arterial or aortic constriction resulted in no significant changes in Mw or Lw in either ventricle. Ischemia and reperfusion decreased Mw and shifted Lw to the right in both ventricles. The decrease in Mw with 30 min ischemia exceeded the decrease with 20 min ischemia by 29% in the right ventricle and by 32% in the left (p less than .04) with up to 1 hr of reperfusion. Changes in Lw were not related to severity of injury. After ischemia, infusion of calcium increased Mw by 177% in the right ventricle and by 67% in the left (p less than .03) without significant changes in Lw. Independent of load conditions, the slope Mw, of the linear stroke work vs end-diastolic length relationship is a valid and precise index of right and left ventricular contractile response to global ischemia in the intact circulation. This variable may be useful in evaluating therapies designed to limit myocardial injury and enhance ventricular functional performance.

Animals↗

Ventricular function after atrial cardioplegia.

Continuous retrograde coronary sinus cardioplegia (CSCP) has previously been carefully evaluated experimentally and shown to be efficacious during ischemia, even in the presence of coronary lesions and in the hypertrophied state. A new technique of retrograde cardioplegia delivery through the right atrium, using right ventricular distension and pressures of 60 mm Hg, has recently been described with excellent clinical results. This study was designed to specifically examine right ventricular function after atrial cardioplegia and acute passive right ventricular distension. CSCP (n = 10) was compared with cardioplegia delivered through the right atrium both continuously (n = 10) and intermittently (n = 8). When ventricular function was examined with the use of the load-independent relationship of stroke work vs end-diastolic length, there was a profound deterioration of right ventricular function in both atrial cardioplegia groups (44% and 37% of control values, respectively) after 1 hr of reperfusion. In contrast, biventricular function was fully preserved in the CSCP group 1 hr after reperfusion. Left ventricular function measured at the end of reperfusion was preserved in all three groups. Right ventricular ATP levels were slightly but significantly depressed in all groups and in the atrial cardioplegia groups, this metabolic change was also seen in the left ventricle. These metabolic and hemodynamic data may reflect the inability of atrial cardioplegia to cool the myocardium below 16 degrees C. Postoperative right ventricular dysfunction may be more common than has been previously thought when atrial cardioplegia is used, particularly in the absence of topical cooling.

Adenine Nucleotides↗

Myocardial protection.

Early studies of myocardial protection were designed to minimize ischemic injury. The next class and generation of investigations will most likely be designed to accelerate recovery following known myocardial injury. Such techniques will play an important role in allowing operations on acutely injured and ischemic myocardium and will be important in the treatment of postischemic injury when such injury occurs during the course of complex cardiac operations. Surgical aspects of myocardial metabolism are still rudimentary and many empiric observations require further exploration into the mechanisms by which such applications work.

Adenosine Monophosphate↗

Papillary-annular continuity and left ventricular systolic function after mitral valve replacement.

The contribution of the subvalvular apparatus to left ventricular function was evaluated in a canine preparation that allowed variation of subvalvular tethering forces after mitral valve replacement. Ten normal dogs were instrumented with micromanometer-tipped pressure catheters in the left ventricle and left atrium and piezoelectric sonomicrometry crystals to measure left ventricular major-axis, minor-axis, and wall thickness dimension changes. After control data were obtained, each dog underwent cardiopulmonary bypass and the mitral valve was replaced with a St. Jude bileaflet valve (No. 23 or 25). The native valve was completely excised and all chordal attachments were severed at the head of each papillary muscle. A 3-0 prolene suture was passed through the head of each papillary muscle, gently tied over a pair of felt pledgets, and exteriorized in a paravalvular manner that allowed both "attached" and "detached" states to be studied in a randomized manner 1 hr after release of the aortic cross-clamp. A significant (p less than .05) increase in major-axis length from control was observed in the detached state at both end-diastole and end-systole when compared at matched left ventricular end-diastolic pressures. Systolic function measured by load-dependent variables at matched end-diastolic lengths was higher in the detached state. However, when systolic function was examined by load-independent variables such as the slope of the stroke work end-diastolic length relationship, the slope of the end-systolic pressure-volume relationship, or the stroke work end-diastolic volume relationship, no statistically significant difference could be detected between states of papillary-annular continuity.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗

The efficacy of blood versus crystalloid coronary sinus cardioplegia during global myocardial ischemia.

The efficacy of blood and crystalloid retrograde cardioplegia in protecting the ischemic myocardium was compared. Seventeen dogs underwent 2 hr of global myocardial ischemia while on cardiopulmonary bypass. Crystalloid (in nine dogs) or blood (in eight dogs) cardioplegic solution was infused continuously into the coronary sinus. Left and right ventricular function were assessed before ischemia and after 30 and 60 min of reperfusion by means of highly sensitive, load-independent index of contractility (the slope of the stroke work vs end-diastolic length relationship). Ventricular biopsies for ATP determination were obtained before ischemia, at the end of ischemia, and after 60 min of reperfusion. Left and right ventricular function returned to normal after 60 min of reperfusion in both groups. Left ventricular ATP remained unchanged, whereas small but significant decreases in right ventricular ATP were observed after 60 min of reperfusion in both groups. Thus continuous crystalloid or blood retrograde coronary sinus cardioplegia in dogs preserved myocardial function and metabolism equally well after 2 hr of global cardiac ischemia.

Adenosine Triphosphate↗