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Biomedical subjects

A Weinfeld

Publications and source records attributed to A Weinfeld.

At least 37 records · Page 2Linked to original sources

Resistance to therapy of acute leukemia developing in the course of polycythemia vera.

Thirteen patients in whom acute leukemia developed in the course of polycythemia vera were initially treated with vincristine and prednisone in an attempt at remission induction. None responded, and four died during this initial course of therapy. Induction was then attempted in the nine survivors, using cytosine arabinoside and adriamycin. Only one complete remission of 38 weeks and one partial remission were achieved, while median survival was 32 days. Poor results may reflect both the intrinsic biologic properties of the acute leukemia occurring in this setting and the advanced age of the patients.

Acute Disease↗

Empiric treatment of fever in acute leukaemia with tobramycin-cephalothin, and the escape clause provision of corticosteroids.

29 episodes of suspected septicaemia in patients with acute leukemia were treated empirically with tobramycin 180--240 mg/day intravenously together with cephalothin 12 g/day. Patients without documented infection who did not respond to antibiotics and whose fever developed after a course of cytotoxic drugs, were given the provision of high dose corticosteroid therapy. Infection was documented microbiologically or clinically in 13/29 episodes. Septicaemia was proven in 7, and 6 had pneumonia. Neutropenia was present in 18/29 episodes. A satisfactory response to initial therapy was achieved in 7/13 with documented infection and in 9/16 without proven infection. The overall good response was 55%, 5/7 cases with septicaemia, but only 2/6 with pneumonia responded well. The 2 septicaemia patients who did not respond had Pseudomonas aeruginosa sepsis. In 16 episodes without documented infection 7 did not respond to initial therapy. To 4 of them, who were subject to recent cytotoxic drug administration, high dose corticosteroid therapy was given, and 3 of them responded well. Of the remaining 3 non-responders, one became afebrile after cytostatic and one after prednisolone treatment. Serum assays of tobramycin were done on the 1st and 5th day of therapy and no difference in concentration was observed on these 2 occasions. Five patients developed renal failure, but this was attributed to antibiotic therapy only in 1, who initially had an elevated serum creatinine. It is concluded, that in hospitals where pseudomonas is not a dominating pathogen, tobramycin--cephalothin may be a good combination to start empiric therapy with. In patients without proven infection, who have recently been subjected to cytotoxic therapy, and who do not respond to the initial course of antibiotics, a high dose of corticosteroids may be tried, provided the patient is monitored for the hazard of bacterial infection.

Adrenal Cortex Hormones↗

Mediastinal adenopathy in myeloma.

Radiographic detection of intrathoracic lymphadenopathy in multiple myleoma is uncommon, but may occur late in the course of the disease. Rarely, it may present a diagnostic problem and needle aspiration biopsy may be necessary for definitive diagnosis.

Diagnosis, Differential↗

Mediastinal pancreatic pseudocyst.

The extension of a pancreatic pseudocyst into the mediastinum is a difficult clinical and radiographic diagnosis. The chest roentgenogram reveals a retrocardiac mass in a patient with nonspecific upper abdominal and chest complaints. Usually there is a preceding history of alcoholism or pancreatitis. The upper gastrointestinal series often demonstrates typical displacement of the distal esophagus anteriorly and to the left. The value of computed tomography is illustrated. Correct preoperative diagnosis is important for proper surgical treatment, since a mediastinal pseudocyst is best managed without thoracotomy.

Adult↗

Platelet survival and platelet production in acute myocardial infarction.

Thrombokinetic studies were carried out on 26 consecutive patients with myocardial infarction (MI) admitted to a coronary care unit in the acute stage during a two-month period. The results were compared with those of an age-matched control group. In the MI patients, platelet mean life-span was 5.0 +/- 0.3 days and significantly shorter (p greater than 0.01) than in the controls (6.4 +/- 0.4 days). The mean platelet production rate for the patients with MI was significantly higher (p greater than 0.005) than for the controls. On the basis of results reported by others as well as the present data, it is suggested that during the acute phase of MI there is no additional measurable reduction in platelet survival above that observed in chronic coronary artery disease.

Acute Disease↗

Postlymphographic cerebral lipid embolization in the vena cava superior syndrome.

A recent case of Lipiodol Ultrafluid embolism to the brain is reported. Pathogenetic concepts involving right-to-left shunts, and lympho-venous shunts with pulmonary capillary overloading are reviewed. In addition, it is suggested that a local disturbance in cerebral circulation due to a cava superior syndrome may contribute to the severe cerebral symptoms.

Adolescent↗

Ph1-negative eosinophilic leukaemia with trisomy 8. Case report and review of cytogenetic studies.

A case of eosinophilic leukaemia of the mature cell type in a 73-year-old man is described. Bone marrow chromosomes were studied in direct preparations on 3 occasions. With the G- and Q-banding techniques an extra chromosome number 8 was observed in all metaphases. There was no Ph1-chromosome. Therapy with vincristine and prednisone produced remissions but the course of the disease was accelerated. Review of the literature and study of the present case suggests that eosinophilic leukaemia like CGL may be divided into a Ph1-positive and a Ph1-negative group. In both groups karyotype abnormalities may be present and might herald a downhill course.

Aged↗

On the analysis of platelet survival curves and the calculation of platelet production and destruction.

Platelet survival, platelet production and megakaryocyte quantifications were studied in control subjects and in patients with idiopathic thrombocytopenic purpura (ITP) and primary thrombocythaemia (PT). A platelet death probability function (DPF), which gives the expected probability of a randomly chosen platelet to be destroyed within the nextcoming short time interval, was constructed on the basis of the present knowledge of platelet function and the factors that influence its survival. Starting from this function platelet age and life span distributions and the function for the survival curve were derived. Platelet mean life span (MLS) was in controls 6.9d, in PT 5.2Dd and in ITP 0.44d. Determinations of platelet life span and platelet age distributions revealed a considerable variation in platelet life spans about these means and a great difference in platelet age compositions between the 3 groups of subjects studied. The function for the platelet survival curve, derived from the DPF, was employed in the calculation of platelet production and there was a highly significant relationship between platelet production and megakaryocyte volume per microliter bone marrow giving mutual confirmation to the 2 determinations and to the correctness of the death probability function.

Adolescent↗

Polycythaemia vera terminating in acute leukaemia. A clinical, cytogenetic and morphologic study in 8 patients treated with alkylating agents.

A total of 120 patients with polycythaemia vera (PV) were observed between 1971-1976. 8 of them developed acute leukaemia (AL). The clinical course, cytogenetic and morphologic findings of these patients are described in detail. Alkylating agents were the main treatment for all patients who developed AL. 4 of them obtained alkylating drugs alone. Deaths in AL constituted 36% of the deaths observed in the groups treated with alkylating agents and 23% of the total number of deaths in these series. All patients who developed AL had active disease but they had no distinctive features predicting a malignant development. The time interval between PV diagnosis and development of AL was relatively short for those patients who were induced and maintained with alkylating agents alone. It is remarkable that 3 out of 8 patients had erythroleukaemia. Cytogenetic pretreatment studies were performed in 3 patients and all were normal. 7 patients were studied with banding techniques during the leukaemic state and all but one have shown multiple and complex abnormalities indicating several super-imposed cell lines. It seems probable that PV patients treated with alkylating agents for remission induction and maintenance may run even a greater risk for AL development than those treated with 32P.

Aged↗

In vitro labelling of platelets. Experimental study on splenectomized patients with lymphomas using two different incubation media.

Duplicate platelet survival studies, using autologous platelets labelled in vitro with radioactive sodium chromate, were carried out on 5 lymphoma patients who had been splenectomized 14-21 months earlier. In the first experiment plasma was employed as the incubation medium and in the second a Ringer-citrate-dextrose (RCD) solution. The uptake of chromate by the platelets was 2.0 times higher in the RCD as compared to the plasma experiments. An identical pattern for the immediate behaviour of infused labelled platelets was observed in the duplicate studies, and the recovery of platelet-bound radioactivity remained stable at the 90% level during 2 h after infusion. In these experiments the means for platelet mean life span were almost identical, 5.4+/-0.6 and 5.3+/-0.5 days, respectively, and significantly (p less than 0.05) shorter than the mean for a control group consisting of 21 healthy males (6.9+/-0.3 days). It is concluded that RCD and plasma seem to serve equally well as incubation medium at the in vitro labelling of platelets.

Adult↗

Histamine metabolism in polycythaemia vera.

Histamine metabolism was studied in 35 patients with polycythaemia vera (PV) at different stages of their disease and compared with controls and patients with secondary polycythaemia. In addition to blood and urinary histamine the main urinary metabolites of histamine, methylhistamine (MeHi) and 1-methyl-4-imidazoleacetic acid (MeImAA) were measured. In patients with active PV the excretion of MeHi and MeImAA was significantly higher than in controls and secondary polycythaemia, indicating an increased histamine formation. The MeImAA excretion was correlated to the blood histamine level, the degree of blood basophilia, the total white blood count and the spleen volume. The blood histamine level was significantly higher in PV patients compared with controls and secondary polycythaemia. No patients with secondary polycythaemia had an increased blood histamine level. With the bio-assay technique used in this study the urinary excretion of histamine in the PV patients was within the normal range. There was no correlation between the increased histamine formation and "histamine-related symptoms". Pruritus and duodenal ulcer occurred with a similar frequency in patients with and without increased MeImAA excretion. The similarity between the disturbance of the histamine metabolism in PV and that found by other authors in chronic myeloid leukaemia is pointed out.

Adult↗

Megakaryocyte quantifications in relation to thrombokinetics in primary thrombocythaemia and allied diseases.

Megakaryocyte morphology was studied quantitatively in primary thrombocythaemia (PT) and in chronic myelogenous leukaemia (CML). The relation of thrombokinetics to megakaryocyte quantifications was evaluated in PT and compared to previously obtained results in polycythaemia vera (PV) and idiopathic thrombocytopenic purpura (ITP). Megakaryocyte area, number and volume per mul bone marrow were significantly higher in PT as compared to controls. The nuclear lobe number was significantly increased and the megakaryocytes were shifted towards more mature forms, suggesting a prolonged megakaryocyte generation time. In CML the megakaryocyte number and volume per mul bone marrow were also significantly above normal, but the megakaryocyte area, number of lobes and degree of megakaryocytic maturation were significantly below normal. Platelet production was in PT 6.2 times normal and proportional to the increase in megakaryocyte volume which was 6.8 times normal. In PV with major splenomegaly the mean platelet production rate was higher (9.5 times normal) although their peripheral platelet count was lower than in PT. This discrepancy is explained by the greatly enlarged splenic platelet pool in the PV patients. In ITP the mean platelet production rate was 2.2 to 3 times normal and was significantly lower than in PT and PV.

Adult↗