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Biomedical subjects

H S Ballard

Publications and source records attributed to H S Ballard.

At least 19 recordsLinked to original sources
PubMed1997

The hematological complications of alcoholism.

Alcohol has numerous adverse effects on the various types of blood cells and their functions. For example, heavy alcohol consumption can cause generalized suppression of blood cell production and the production of structurally abnormal blood cell precursors that cannot mature into functional cells. Alcoholics frequently have defective red blood cells that are destroyed prematurely, possibly resulting in anemia. Alcohol also interferes with the production and function of white blood cells, especially those that defend the body against invading bacteria. Consequently, alcoholics frequently suffer from bacterial infections. Finally, alcohol adversely affects the platelets and other components of the blood-clotting system. Heavy alcohol consumption thus may increase the drinker's risk of suffering a stroke.

Alcoholism↗
PubMed1994

The association of thrombocytopaenia and Lyme disease.

The association of asymptomatic thrombocytopaenia in six patients with acute Lyme disease is described. Recovery from thrombocytopaenia occurred shortly following antibiotic therapy. Patients residing in endemic areas for Lyme disease who present with flu-like symptoms and laboratory findings of thrombocytopaenia should prompt suspicion of acute Lyme disease. Appropriate clinical studies should be undertaken to confirm the diagnosis.

Acute Disease↗
PubMed1992

The association of erythrocytosis and chronic lymphocytic leukemia.

The authors report the clinical course of three patients with well-documented chronic lymphocytic leukemia (CLL) and concomitant erythrocytosis. Associated disorders included immune cytopenias, Hashimoto struma and Richter syndrome. Durable complete remissions of CLL have occurred in two patients. Inasmuch as a chance association of these two relatively rare hematologic disorders is unlikely, the available information suggests that a pluripotent stem cell with the capacity to differentiate into lymphoid and erythroid pathways is the most attractive hypothesis.

Aged↗
PubMed1990

Chronic calcium antagonist use in carcinoma of the lung and colon: a retrospective cohort observational study.

Detailed records were maintained prospectively of all medications taken by 719 patients with advanced carcinoma of the lung or colon. Of this total, a cohort of 19 patients was identified who had ingested incidentally either nifedipine, diltiazem, verapamil, or trifluoperazine in standard therapeutic doses for a minimum of one month and a mean of 5.8 months and median of three months. Treatment with these calcium antagonists was well tolerated and, upon comparison with otherwise comparable patients who did not ingest a calcium antagonist, appeared to be associated with certain favorable outcomes, including delayed tumor progression and prolonged survival. These preliminary findings suggest that beneficial effects of such drugs observed with chronic treatment in experimental animal tumor models may occur in human disease and that definitive prospective, randomized, clinical trials of calcium antagonists administered continuously in ordinary therapeutic doses are both feasible and justified.

Calcium↗
PubMed1989

Hematological complications of alcoholism.

Numerous clinical observations support the notion that ethanol has multiple pathologic effects on hematopoietic tissue. The effects of alcohol on blood are diverse. The long-term ingestion of large quantities of ethanol has been shown to alter a substantial number of physiologic and biochemical variables. Abnormalities involving leukocytes, platelets, and erythrocytes may occur singly or in various combinations. Due to the frequent concomitant presence of alcohol-related hepatic disease, nutritional deficiencies, infection, and other chronic diseases, it is often difficult to distinguish the specific hematologic toxicities of alcohol ingestion from the hematologic toxicities of associated morbid conditions. Depressed hematopoietic cell formation (Table 2), increased destruction, and alterations in morphology and function of hematopoietic cells have been described.

Alcoholism↗
PubMed1988

Effect of mopidamol on survival in carcinoma of the lung and colon: final report of Veterans Administration Cooperative Study No. 188.

Mopidamol (RA-233), a derivative of dipyridamole, is a phosphodiesterase inhibitor that has been shown previously to limit progression of malignancy in certain experimental animal models and in a pilot study in humans. RA-233 plus chemotherapy was compared with chemotherapy alone in a 5-year double-blind trial involving 719 patients with advanced carcinomas of the lung and of the colon. RA-233 treatment was associated with a statistically significant prolongation of survival in patients with non-small cell lung cancer (N-SCLC) limited to one hemithorax and with reduction in mean plasma fibrogen concentration. RA-233 was not toxic. The favorable effects on survival could not be explained by any factor other than the RA-233 treatment. In other tumor categories tested, no differences in survival were observed. These results suggest that RA-233 is useful in the treatment of N-SCLC of limited extent. They also suggest that therapeutic intervention aimed at modified intracellular pathways might constitute a novel investigative approach to the treatment of cancer.

Carcinoma↗
PubMed1985

Disseminated Kaposi's sarcoma without lymphocyte abnormalities.

In a 24-year-old bisexual man with stage IV Kaposi's sarcoma, the typical immunologic alterations reported in other patients with disseminated Kaposi's sarcoma were not seen. Lymphopenia, a low helper-suppressor T-cell ratio, impaired lymphocyte responses to T- and B-cell antigens and mitogens, and abnormalities in cell-mediated immunity could not be demonstrated.

Adult↗
PubMed1981

Cytoplasmic fragments causing spurious platelet counts in hairy cell leukemia: ultrastructural characterization.

A patient with hairy cell leukemia had a spuriously elevated automated platelet count because of cytoplasmic fragments. The cytoplasmic fragments observed with electron microscopy were found in the same fraction as the platelets (platelet-rich plasma). Ultrastructural examination confirmed the hairy cell cytoplasmic origin of these fragments because of their obvious difference from platelet ultrastructure. Cytoplasmic fragments as a cause of spuriously high automated platelet counts should be considered in all cases of hairy cell leukemia. The blood smear can suggest these factitious events and should be used to confirm the platelet count. It is important to validate the automated platelet count even when reported values are within the normal range, since electronic counting may result in a spurious thrombocytosis or a spuriously normal count.

Blood Platelets↗
PubMed1980

Alcohol-associated pancytopenia with hypocellular bone marrow.

Two patients who presented with pancytopenia and bone marrow hypocellularity are described. Both patients had consumed alcohol in excess for many years, and one patient had previously presented with alcohol-associated thrombocytopenia and a hypocellular marrow. Marrow examinations revealed increased hemosiderin, vacuolated pronormoblasts and promyelocytes, and ringed sideroblasts. Serum and erythrocyte folate levels were normal. The marrow findings coupled with the long history of heavy alcohol consumption and documented alcohol-associated thrombocytopenia on two separate occasions in one patient, in the absence of known marrow toxins, support the notion that the marrow hypocellularity was alcohol associated.

Alcoholism↗
PubMed1976

Platelet aggregation in portal cirrhosis.

Primary and secondary platelet aggregation in response to adenosine diphosphate was studied in 24 patients with portal (Laënnec) cirrhosis and compared with platelet aggregation in 14 normal subjects. In 12 patients with cirrhosis, platelet aggregation was diminished when compared to controls. Of the 12 patients with impaired aggregation, 6 had elevated levels of fibrinogen-fibrin degradation products (FDPs), 11 had thrombocytopenia, 10 had shortened euglobulin lysis times, 11 had prolonged bleeding times, 4 had hypofibrinogenemia, and all had prolonged thrombin clotting times. The data suggest that elevated levels of serum FDPs do not explain fully the impairment of platelet aggregation or the prolongation of the thrombin clotting time that was noted in patients with advanced liver disease. A possible explanation for the prolongation of the thrombin clotting time is the presence of "altered" plasma fibrinogen.

Adenosine Diphosphate↗