Periosteal (juxtacortical) chondrosarcoma: Report of a case occurring in the hand

A rare case of periosteal (juxtacortical) chondrosarcoma of the hand is described. Inadequate excision was followed by recurrence which necessitated a transmetacarpal amputation to eradicate the malignant disease.     

Relation of calcification to torn leaflets of spontaneously degenerated porcine bioprosthetic valves

The gross appearance of 54 spontaneously degenerated porcine bioprosthetic valves was evaluated to determine the relation of calcium deposition to cusp disruption. Tears or perforations were shown in 89% (48) of the degenerated valves. The most common site of tears or perforations was near the commissural attachment (60% of all tears). Grossly visible deposits of calcium salts that ruptured to the surface of the cusps or caused changes in the topography were observed in 70% (38) of the 54 valves. Calcification was adjacent to tears or perforations in 56% (27) of the 48 valves with torn cusps. Among the valves that showed calcification, the deposits of calcium salts were adjacent to tears or perforations in 71% (27 of 38). The location of deposits of calcium did not relate to the age or sex of the patient or to the position of the valve, but valves with calcium were inserted longer than valves with no calcium (87 +/- 4 versus 58 +/- 7 months; p less than 0.001). The outflow surfaces showed more calcification than the inflow surfaces, irrespective of whether the valves were in the aortic or mitral position. Among the 38 valves with calcification, 92% (35) showed calcification at the commissural attachments, 53% (20) showed calcification in the body of 1 or more cusps, 11% (4) near the base, and 8% (3) near the free edge. In conclusion, most patients with spontaneous porcine valve degeneration showed calcification. The calcification was associated with tears or perforations of the cusps in 50% of all degenerated valves, in 56% of valves with torn cusps, and in 71% of valves that showed gross calcification.     

Failure of standard cardioplegic techniques to protect the conducting system

To determine the site of persistent electrical activity during cardioplegic arrest, microelectrodes that were also capable of recording temperature were placed along the conducting system in dogs undergoing one hour of cardioplegic arrest. Electrical activity was highest in the atrioventricular (AV) junction area (AV node and proximal bundle of His), and the temperature in this area could not be lowered to the level of the temperature in the left ventricular apex by routine cardioplegic technique. Neither changing K+ concentration (16 to 20 mEq/L) nor adding procaine hydrochloride abolished the activity of the conducting system during cardioplegia, and only 2 of 15 dogs were in sinus rhythm 30 minutes after reperfusion. When the conducting system temperatures were lowered to less than 15 degrees C by right AV lavage with iced saline solution, electrical activity was abolished during arrest and all 4 of 4 animals were in sinus rhythm 30 minutes after reperfusion. This study localizes the site of persistent conducting system activity during cardioplegic arrest, confirms it can be abolished with local cooling, and establishes the relationship between conducting system activity during cardioplegia and the incidence of conduction block and junctional rhythm following reperfusion.     

Metastatic tumors of the hand: a report of six cases.

Six metastatic tumors of the hand of mammary, renal, pulmonary, colonic, and humeral origins are described. The areas involved were the distal phalanges, the metacarpal bones, a carpal bone, the nail bed, and the soft tissue of the dorsum of the hand. All six patients died within a few months after the metastatic lesions were diagnosed correctly. Metastases to the bone can cause destruction, pain, and swelling and may be misdiagnosed before operation as osteomyelitis. Metastases to the soft tissues tend to be asymptomatic and can closely mimic benign soft tissue tumors.     

The Sutureless Electrode: Comparison with Transvenous and Sutured Epicardial Electrode Placement for Permanent Pacing

Consecutive series of 50 transvenous and 50 sutureless pacemaker insertions were reviewed and compared with a nonsimultaneous series of 50 patients who received sutured epicardial pacemakers. It is concluded that: (1) the sutureless electrode has a lower initial stimulation threshold than the transvenous type; (2) complications from sutureless electrodes are greater than with transvenous electrodes and similar to the incidence with sutured epicardial pacemakers; (3) initial pacing is more satisfactory with the sutureless electrode compared with the transvenous model; and (4) late electrode failure due to threshold rise is greater with the sutureless electrode than with the transvenous or sutured epicardial type.     

Effects of pulsatile perfusion pressure and storage on hearts preserved for 24 hours under hypothermia, for transplantation.

Canine hearts preserved for 24 hours under hypothermic pulsatile perfusion at a systolic pressure of 25 mm Hg had better perfusion and transplantation survival results than hearts perfused at 50 or 80 mm Hg. Also, hearts perfused at a systolic pressure of 25 mm Hg did better than simple hypothermically stored hearts or fresh allografts. These findings indicate that hearts are adequately perfused for 24 hours under hypothermia for transplantation at a systolic pressure of 25 mm Hg.     

Auxiliary Heart Transplantation

At the present time, the major obstacles in the successful clinical application of heart transplantation are the immunological attack on the allograft, the treatment of complications resulting from immunosuppression, and the supply of transplantable hearts. Recently, auxiliary heart transplantation has been proved to be a successful technique for treatment of end-stage myocardial failure in humans. Here we review the experimental work in auxiliary heart transplantation leading to the preent technique used in humans.     

Bacteremia,Endocarditis, and the Hancock Valve

Among 373 patients with porcine xenografts, there were 27 instances of exposure of the xenograft to bloodstream or endocardial infection in 22 patients. Nine patients underwent 10 separate insertions of xenografts for active infective endocarditis. There were no early infections or valve failures. Three patients returned with a late prosthetic valve endocarditis (PVE) due to a new infection. There were 6 instances of bacteremia early after xenograft valve insertion with no early infection, no valve dysfunction, and 1 instance of late PVE. Eleven patients had PVE on a porcine xenograft. Blood cultures in the 10 patients treated with antibiotics promptly became negative. There were 3 valve-related deaths: 2 from valve incompetence and 1 from mitral and aortic xenograft stenosis. Our experience suggests that the Hancock porcine xenograft is: (1) as resistant to infection as are rigid prostheses in active infective endocarditis; (2) resistant to early postoperative bacteremias; and (3) easier to sterilize than rigid prostheses and more durable than other tissue valves in the face of PVE.     

Prospective randomized evaluation of intrathoracic intercostal nerve block with bupivacaine on postoperative ventilatory function.

This prospective and randomized study demonstrates the beneficial effect of intrathoracic intercostal block with bupivacaine on the recovery of pulmonary function after thoracotomy. A significantly (p less than 0.05) better forced expiratory volume was seen in the treated group in the early post-operative period. Similar findings were observed in forced vital capacity. Also, the requirements for analgesics were decreased in the treated group. We believe that intrathoracic intercostal block with bupivacaine when properly utilized can be a good adjuvant in the improvement of pulmonary function after thoracotomy.     

The Value of Radiographic and Computed Tomography in the Staging of Lung Carcinoma

A prospective double-blind study was undertaken to compare computed tomography (CT) and conventional radiographic tomography (RT) in the staging of lung carcinoma. Seventy-five patients had CT and RT of the mediastinum and hilum prior to operation. The presence or absence of metastasis to lymph nodes documented at the time of operation was the standard applied to the studies. CT correctly predicted the presence or absence of mediastinal lymphadenopathy in most cases (sensitivity 91%, specificity 94%), while RT was less helpful (sensitivity 61%, specificity 86%). Metastatic mediastinal lymph nodes in those patients with false negative CT and RT studies averaged only 0.8 cm in diameter, probably accounting for the negative radiographic findings. Both CT and RT had poor predictive values in detecting hilar lymphadenopathy (sensitivity 73% and 47%, specificity 87% and 72%, respectively).The predictive value of CT in the evaluation of mediastinal lymphadenopathy equaled that of mediastinoscopy or mediastinotomy. When CT of the mediastinum demonstrates no lymphadenopathy, invasive staging can be deferred for definitive thoracotomy. Since false positive values were seen with both CT and RT scans of the mediastinum (4% and 8%, respectively), invasive staging will still be necessary in those patients with positive studies.     

Comparative study of different pancreas transplantation modalities: Islet cell vs organ pancreas transplantation in pancreatectomized dogs

This report confirms the satisfactory results obtained with splenic autotransplantation of islet cells or organ pancreas transplantation. When the allotransplantation technique was utilized, the islet cells rejected significantly faster than the organ pancreas grafts. Rejection in the allotransplant model was correlated with high levels of glucose and amylase at the onset of this phenomenon in the organ graft group and only elevation of glucose in the islet cell group. A progressive increase of these levels was continued after the first rejection was established and this persisted until death. Our data in the dog appear to indicate that islet cell allotransplantation is not justified clinically until better methods to control rejection are introduced. However, islet cell autotransplantation appears to be a good technical advancement in cases with pancreatitis undergoing total or near total pancreatectomy. Organ pancreas transplantation appears to be a good technique for allotransplantation in virtue of our results observed in the dog that has been moderately immunosuppressed.