Ocella Class Action News
Ocella Class Action News – 2/6/2012:
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Before a prothrombotic state is sought in patients with recurrent pregnancy loss, structural, cytogenetic, and endocrinological abnormalities should be ruled out. If no other cause for the pregnancy loss can be discerned, an antiphospholipid antibody should be sought. It remains controversial whether other causes of a prothrombotic condition should be investigated such as the factor V Leiden mutation, the prothrombin gene mutation, or hyperhomocysteinemia.
There are many published reports of strategies used for the prevention of fetal loss in patients with APS. However, only a few present data derived from well- designed and executed clinical trials. To provide the most rigorous possible conclusions, we have limited this review to treatment recommendations derived from studies in which all patients had a persistently positive antiphospholipid antibody and two or more first-trimester pregnancy losses or one or more second- or third- trimester losses. We excluded studies including patients with secondary APLA, such as those with SLE, to eliminate confounding effects of the underlying disease on the likelihood of successful pregnancy outcome, and we excluded nonrandomized studies with less than 10 patients because of the potential for bias in these small case series.
One recently reported study is relevant to this review, but is not included in the analysis because it did not satisfy the inclusion criteria. The randomized controlled trial published by the Pregnancy Loss Study Group (59) enrolled 16 patients, 9 of whom received heparin and ASA, and 7 of whom received heparin, ASA, and IVIG administered in a dose of 2 g/kg monthly from documentation of pregnancy until 36 weeks gestation. All 16 patients enrolled in this study delivered successfully. However, it was not clear whether the antiphospholipid antibody titer was confirmed on at least two occasions.
Low-molecular-weight heparins are an attractive alternative to standard heparin for many indications because, in animal models, they produce less osteoporosis than standard heparin, yet they appear to be at least as effective as standard heparin. This suggests that low-molecular-weight heparins would be an excellent choice for anticoagulation during pregnancy. However, until good-quality evidence exists for the effectiveness of the low-molecular- weight heparins in patients with an antiphospholipid antibody and recurrent pregnancy loss, their routine use cannot be recommended.
In summary, based on currently available literature, it appears that the treatment of choice for the prevention of pregnancy loss in women with APS is low- dose heparin and aspirin. Although we cannot confidently exclude the possibility that prednisone plus ASA therapy is as, or more, effective than heparin plus aspirin therapy, prednisone-containing regimens are associated with a higher risk of maternal and obstetric toxicity. In addition, based on our analysis, we conclude that rigorous clinical trials designed to determine the optimal type and duration of treatment to enhance the likelihood of live birth are urgently needed.
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Ocella Class Action News: As with all other areas in this field, there remain many unanswered questions. Although one small study suggests that low-dose unfractionated heparin increases the likelihood of successful pregnancy outcome, there are no independent, randomized studies to support this conclusion. Low-molecular-weight heparins have replaced unfractionated heparin in many clinical circumstances; whether low- molecular-weight heparin can replace unfractionated heparin in this patient population has never been tested in a randomized clinical trial. Aspirin therapy is widely accepted in this patient population, yet its efficacy has never been proven in a methodologically rigorous study. Finally, the role of anticoagulants or immunosuppressant therapy has never been tested in women who are unable to con- cieve, or those with pregnancy loss at less than 8 weeks gestation.
Furthermore, the response of patients with antiphospholipid antibody-associated thrombocytopenia to immunomodulatory therapy supports the hypothesis that the thrombocytopenia is due to immune platelet destruction. No large prospective studies of therapy for antiphospholipid antibody-associated thrombocytopenia have been reported. However, based on anecdotal experience, therapy with corticosteroids, intravenous immunoglobulin, immunosuppressive agents, and, ultimately, splenectomy for patients with severe, refractory thrombocytopenia may be effective. Galindo and colleagues reported their experience with 11 patients who underwent splenectomy for severe, refractory thrombocytopenia. Nine patients had a good clinical response, as defined by platelet counts in excess of 100 X 109/L without pharmacological therapy. Many patients with immune platelet destruction will have markedly low platelet counts (30 to 50 X 109) yet be asymptomatic; such patients are best treated with careful monitoring, rather than potentially toxic interventions. If therapy for thrombocytopenia is required, platelet counts can usually be temporarily increased with corticosteroids or intravenous immunoglobulin.
Considerable evidence supports a relation between postmenopausal hormone therapy and cardiovascular disease. Specifically, long-term use of hormone therapy is associated with substantial protection against heart disease. This protection, observed largely in observational epidemiological studies, may be due, in part, to self-selection bias. Women who take hormones may not be completely comparable to those who do not; women on hormone therapy see a physician regularly and may lead generally healthier lifestyles. However, adjustment for known cardiac risk factors in many of the large studies of homogeneous populations had little impact on their results, implying an equivalent risk status for users and nonusers. To date, however, no randomized trial data in primary prevention have been presented. The effect of progestin added to estrogen therapy has not been adequately assessed, but initial evidence suggests that most of the coronary benefit is probably retained. Considerable controversy exists regarding the effect of hormones in women with established coronary disease, although, like the studies of primary prevention, existing data suggest long-term benefits. On the other hand, the only randomized trial in secondary prevention, the HERS study, failed to show the expected benefits of this approach over a 4-year period of observation.
Cardiovascular diseases (CVD) remain the leading cause of death in women. The role of hormone therapy in CVD remains a controversial topic, despite clear evidence from randomized clinical trials that hormone use improves the lipid profile, enhances blood flow, and has numerous other beneficial effects on intermediate endpoints. This chapter summarizes the epidemiological investigations regarding the association between postmenopausal hormone therapy and cardiovascular disease, including primary and secondary prevention of coronary heart disease, stroke, and pulmonary embolism. For coronary heart disease, substantial evidence on primary prevention has accumulated from numerous observational studies. Less consistent information is available on the relationship between stroke and hormone therapy. Finally, few studies have examined the relation of hormone use to second coronary events or to pulmonary embolism, but the only completed large-scale clinical trial of hormone therapy addresses these issues.
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Ocella Class Action News: Overwhelming evidence from epidemiological studies indicates an inverse relation between hormone use and heart disease in healthy women. Several observational study designs have been used to examine this association: hospital and community-based case-control studies; cross-sectional studies; and prospective studies; virtually all report a lower risk of heart disease for women who take hormones than those who do not. In addition, results from all the studies have been combined in several meta-analyses, with summary relative risk estimates in all these indicating approximately a 35% lower rate of coronary heart disease (CHD) for hormone users than nonusers. However, many studies suggest that current hormone users enjoy greater protection against heart disease than past users. Thus, combining investigations of current, past, and ever use in a summary estimate is misleading because the results will be directly affected by the proportion of past and current use in the studies included. As expected, summary estimates based on analyses of current use are lower than those derived by combining studies of any hormone use. For all studies of current use.
Of the studies included in the meta-analyses, the Nurses’ Health Study is the largest prospective cohort to investigate hormone use and heart disease. The study was established in 1976 when 121,700 married female registered nurses aged 30 to 55 years completed a mailed questionnaire. Information on coronary risk factors and hormone use was updated with follow-up questionnaires sent every 2 years. Reports of coronary disease are confirmed by medical record review, and data on hormones and other possible risk factors are likely to be reliable since all subjects are registered nurses, with a demonstrated interest in medical research. In the analysis of hormones and heart disease, a total of 70,543 postmenopausal women without prior coronary heart disease were followed for up to 20 years; 945 nonfatal myocardial infarctions and 186 confirmed coronary deaths were documented.
Preliminary data released from the Women’s Health Initiative, an ongoing, large randomized clinical trial of hormone therapy and cardiovascular disease in healthy women, suggested that there may be a slight rise in the risk of heart disease, stroke, and venous thrombosis during the initial 1 to 2 years of hormone use, followed by a decrease in risk with continued use. Unfortunately, there is very little additional evidence available on this issue; most of the observational studies mentioned above primarily consist of long-term hormone users, and very few investigations have specifically examined the short-term effects of hormone therapy on CVD. In the Leisure World Study, a large prospective observational cohort, the relative risk of CHD was 0.73 (95% CI, 0.46-1.16) for recent hormone users of 3 or fewer years duration compared to nonusers; although this estimate of duration was based on a single assessment of hormone use at baseline. In the Nurses’ Health Study, current hormone users of less than 2 years had a relative risk of CHD of 0.53 (95% CI, 0.31-0.93); but, since information is collected biennially, the actual duration of use would be underestimated.
In a small prospective study, Avilaetal found little relation between less than 1 year of current hormone use (RR = 0.9; 95% CI, 0.4-1.9) and MI. In case-control studies, Sidney etal observed no association between current hormone use of less than 1 year and MI (RR = 0.95; 95% CI, 0.37-2.45), and Heckbert also reported that current hormone use of less than 1.8 years was not related to myocardial infarction (RR = 0.91; 95% CI, 0.60-1.38). In the latter study, there was a trend of decreasing risk of MI with increasing duration of hormone use (RR = 0.55; 9% CI, 0.34-0.88 for 8.2 years or more), similar to that reported in the information released by the Women’s Health Initiative. Clearly additional data are necessary.
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Ocella Class Action News: Currently, progestins are prescribed along with estrogen in women with a uterus to reduce or eliminate the excess risk of endometrial cancer due to unopposed estrogen. However, progestin use was quite uncommon during the period that most of the epidemiological studies were conducted. Hence, most of the data are related directly to use of estrogen alone. In studies of intermediate endpoints, randomized clinical trials report significant decreases in LDL and increases in HDL for women assigned to estrogen combined with progestin, but for HDL, the elevation among users of estrogen with medroxyprogesterone acetate (the most commonly used progestin in the U.S.) is significantly less than that for users of estrogen alone. In addition, while estrogen therapy improves blood flow, limited studies suggest that this benefit may be diminished with the addition of progestin. Thus, progestin might be hypothesized to detract from the overall beneficial effects of estrogen on heart disease.
Nonetheless, in the few observational epidemiological studies of primary prevention which separately examine combined hormone therapy, virtually all strongly suggest a similar impact of estrogen combined with progestin and estrogen alone. In a follow-up study in Uppsala, Sweden, the relative risk of MI was 0.64 (95% CI, 0.45-0.90) for women taking estrogen with progestin. In the Nurses’ Health Study, the relation of hormone use to CHD was similar for users of estrogen alone (RR = 0.56; 95% CI, 0.46-0.68) and estrogen combined with progestin (RR = 0.66; 95% CI, 0.49-0.87), after adjusting for an array of coronary risk factors.
Although limited data are available regarding hormone therapy and secondary prevention of CHD, the only published, large-scale randomized clinical trial on hormones and CVD included only women with established CHD. The Heart and Estrogen/progestin Replacement Study (HERS) (10) randomized 2763 women with coronary disease to 0.625 mg of oral conjugated estrogen combined with 2.5 mg of continuous medroxyprogesterone acetate (n = 1380) or placebo (n = 1383). Surprisingly, there was no overall protection against second coronary events for women assigned to treatment, compared to those given placebo (RR = 0.99; 95% CI, 0.80-1.22). However, as also suggested by the preliminary results released from the Women’s Health Initiative, there was a strong trend of decreasing risk of heart disease with increasing duration of hormone use (p-trend = 0.009). In the first year of the trial, the risk of major coronary disease increased 52% among treated women; in the second year, there was no relation between treatment and disease (RR = 1.00), and in the third year the relative risk was 0.87.
Recent data from the Nurses’ Health Study report similar results to the HERS trial. Among 2489 postmenopausal participants with previous coronary disease, we identified 213 cases of recurrent nonfatal myocardial infarctions or coronary deaths. We also observed a trend of decreasing risk of recurrent events with increasing time since initiation of current hormone use (p-trend = 0.002). For users of less than 1 year, the multivariate-adjusted relative risk of major CHD was 1.25 (95% CI, 0.78-2.00), compared to never users. After 2 or more years since beginning hormone use, we found a significantly lower rate of CHD events in current hormone users than in never users (RR = 0.38; 95% CI, 0.22-0.66). Overall, with up to 20 years of follow-up, the relative risk of a second event for current hormone users was 0.65 (95% CI, 0.45-0.95); one can only speculate whether the HERS results may also have indicated overall protection had the follow-up been extended for a longer period of time.
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