Anticoagulant drugs and gender: what is in the elderly? A minireview
Atrial fibrillation (AF) is the most common chronic arrhythmia affecting approximately 9% of population. Gender-
specific clinical predictors of maintenance of sinus rhythm or adequate rate control are sparsely investigated.
Some data suggest gender differences in treatment and response to interventions. Findings from Framingham
Heart Study showed sex-specific AF risk-factor-adjusted-odds for death is slightly higher in females
than males. Sex differences are possible in the effectiveness of DOACs. Elderly female tended to bleed more
with DOACs compared with warfarin, although the risk of bleeding in male was similar for DOACs and warfarin.
To this regard, Rengo et al recommend that warfarin could be preferred in patients with high thromboembolic
risk. Rivaroxaban may be more effective for stroke prevention compared with dabigatran and warfarin in men,
but all 3 drugs seem to provide similar stroke prevention in female. Further studies are needed to understand
whether lower rates of OAC use in the elderly female are associated with differences in clinical outcomes, and
if so, action is needed to eliminate unnecessary differences in OAC use by sex.
Atrial fibrillation (AF) is the most common chronic arrhythmia affecting approximately 9% of population 1. However, Cacciatore F et al. reported that in the elderly, AF is an important risk factor for dementia 2. However, in the elderly, it has been reported the relationships between blood pressure levels, mortality and cognitive impairment 3. Gender-specific clinical predictors of maintenance of sinus rhythm or adequate rate control are sparsely investigated. Some data suggest gender differences in treatment and response to interventions 4. Findings from Framingham Heart Study showed sex-specific AF risk-factor-adjusted-odds for death is slightly higher in females than males 5.
Di Pasquale et al., have been reported that hypertension was the most prevalent associated comorbidity in patients with AF, followed by hypercholesterolemia (28.9%), heart failure (27.7%) and diabetes (24.3%). Hovewer, the authors reported that patients admitted in Internal Medicine were older, more frequently females and more often with comorbidities than patients admitted to Cardiology Department 6. However, as reported by Politi et al., after a first event cerebrovascular, women are hospitalized more frequently than men (7.9 vs 3.9%) 7. Limited data exist on the impact of gender on cardioversion and prescription or continuation of anticoagulants oral (DOACs), in particular in the elderly patients. Guidelines recommend that physicians should offer effective diagnostic tools and therapeutic management to elderly female and male equally 8. In this article, we aimed to review the existing literature about gender-related differences on efficacy, administration and side effects of the most common drugs used for the treatment of ischemic stroke.
THERAPY: DIFFERENCES BY GENDER
In atrial fibrillation, cardioversion to normal sinus rhythms is equally successful in male and female; however, female were less likely to undergo electric cardioversion than male 9. It is important to recognize the significant differences in management and outcomes between the sexes. Greater age, higher BMI, comorbidities, and major bleeding events were the most significant risk factors for elderly female. Higher rates of smoking, alcohol use, and CHADS2 scores were some of the significant risk factors in male with AF 10. A higher proportion of female were not considered for cardioversion due to rate control compared to male (73.8 vs 63.2%). It is striking that female received more conservative treatment despite having greater comorbidities. In fact, female received warfarin therapy (36.8 vs 25.1%) compared to male 11.
It is important to assess sex-specific effectiveness of treatment strategies that show promise with reducing myocardial ischemic acute (MI), heart failure (HF), and all-cause mortality in patients with AF. Despite a higher risk of stroke, elderly female with non-valvular atrial fibrillation (AF) receive less DOACs than male 12. Possible explanations for decreased DOACs use in female include under-recognition of their higher thromboembolic risk or concern for on warfarin in female patients 13. Female with AF have nearly 2 times higher risk for these cardiovascular events when compared with their male counterparts 14.
To this regard, Corbi et al have been reported that the use of International Warfarin Pharmacogenetics Consortium algorithm could estimate the right warfarin dose in the female elderly, and to reduce bleeding risk by over dosed 15.
However, in the literature it has been reported that rivaroxaban [RIVA], dabigatran [DABI], and warfarin are associated with a reduction in all-cause mortality and vascular mortality including those related to HF hospitalizations in patients with AF 16. Data assessing sex-specific associations of DOACs with the risk of MI, HF, and all-cause mortality are lacking in the literature. In analysis of Medicare claims data for elderly patients with newly diagnosed AF in the United States, it has been reported a significant differences in cardiovascular outcomes and all-cause mortality by anticoagulant type within sex. In male, RIVA use was associated with a lower risk of MI compared with either DABI use or warfarin use, while the risk of MI was similar across all 3 anticoagulants in female. In male and female, RIVA and DABI use were both associated with lower risk of HF admissions and all-cause mortality compared with warfarin use 17. The authors demonstrated that both RIVA and DABI use were associated with a reduction in HF risk compared with warfarin in male as well as female with AF 18. In this cohort of US patients with AF and indications for OAC, female sex was associated with significantly less OAC use compared to male sex across the spectrum of thromboembolic risk. Over the past decade, OAC use has gradually increased each year for both female and male. Warfarin use has been declining and DOAC use increasing; these changes have been slightly more pronounced in female compared to male. Even with these shifts in therapy type, female remained significantly less likely than male to receive OAC at all time points. These findings suggest that sex differences in OAC use may be primarily due to differences in the use of warfarin. Over the past 5 years, warfarin use has gradually decreased, and DOAC use has increased by as much as 50% per year in both female and male with a slightly greater rate of increase for female. For example, female may be more likely to decline OAC therapy, particularly warfarin, due to concerns for bleeding, inconvenience, or lack of social support (ie, transportation for international normalized ratio check) 19. However, prior studies have demonstrated that sex-related differences in the risk of stroke decrease when OAC are used 19. Also, sex differences were observed at the highest level of estimated thromboembolic risk (CHA2DS2-VASc ≥ 6), suggesting that even small absolute differences in OAC use may translate into significant sex differences in clinical outcomes. Lauren E. Thompson et al, have been reported in patients with AF and indications for anticoagulation, that female were 9 to 33% less likely than male to receive OAC at all levels of thromboembolic risk 20. The reduced risk of ischemic stroke in patients taking rivaroxaban, compared with dabigatran and warfarin, seems to be limited to male, whereas the higher risk of bleeding seems to be limited to female. The most striking result was the evidence that the therapeutic approach for stroke is often different according to patients’ gender with a clear detrimental prognostic effect for female. A major effort is necessary to overcome this problem in order to ensure equal right to treatment without any sexual discrimination 21. In another nationwide retrospective cohort study, male and female 65 years and older have a clinically relevant benefit of anticoagulation treatment with warfarin. Warfarin is beneficial in patients < 65 years of age in male with CHA2DS2-VASc score > 2 and in female > 3 points 22. Sex-specific comparative effectiveness of direct oral anticoagulants among patients with non-valvular atrial fibrillation is not known. In a subgroup analysis of the ROCKET-AF 23 trial that compared sex-specific effectiveness of rivaroxaban versus warfarin, the risk of stroke and major bleeding were similar with rivaroxaban compared with warfarin in both male and female 23. In contrast, it has been reported that rivaroxaban to be more effective than warfarin for stroke prevention in male and to be similarly effective as warfarin in female. Also, risk of major bleeding was higher in female (but not in male) with rivaroxaban use 24. In a sex-specific subgroup analysis of RELY 25 dabigatran 150 mg BID was superior to warfarin for stroke prevention in both male and female, whereas sex-specific bleeding outcomes were not reported. The baseline stroke risk of RELY trail participants (CHADS2 score of 2.1 ± 1.1) were similar to male (2.3 ± 0.97) and female (2.4 ± 1.1) using dabigatran. In spite it has noted similar effectiveness of dabigatran to warfarin with stroke protection in male and female, whereas RELY reported superiority of dabigatran to warfarin for stroke prevention in male and female. Observational data have both supported 26 and contradicted 27. A Canadian study 28, using a propensity-matched analysis involving 31.786 women and 31.324 men with AF, compared sex-specific effectiveness of dabigatran (110 and 150 mg) to warfarin. The study concluded that dabigatran use was associated with similar stroke risk compared with warfarin in both sexes but was protective against major bleeding only in male. The results of this Canadian observational study are in concordance with these findings, in spite of the fact that all study participants used dabigatran 150 mg BID. In this study, dabigatran and warfarin were similarly effective for stroke prevention in both sexes, while dabigatran decreased risk of major bleeding in male but not in female. In the literature it has been suggest the possibility of a higher bleeding risk in female with AF treated with DOACs 27. The meta-analysis by Alotaibi et al. 25 reported a 21% higher relative risk of bleeding in female treated with DOACs for venous thromboembolism compared with that in male. Female gender, by virtue of their lean body weight, especially our elderly Medicare population, have decreased creatinine clearance compared with male and may attain higher serum levels of DOACs predisposing them to bleed more. Furthermore, differences in sex hormones between sexes may influence variability in hemostasis and vascular reactivity 25. It is also possible that sex gaps in access to care may contribute to bleeding differences between male and female.
Sex differences are possible in the effectiveness of DOACs. Elderly female tended to bleed more with DOACs compared with warfarin, although the risk of bleeding in male was similar for DOACs and warfarin. To this regard, Rengo et al recommend that warfarin could be preferred in patients with high thromboembolic risk 28. Rivaroxaban may be more effective for stroke prevention compared with dabigatran and warfarin in men, but all 3 drugs seem to provide similar stroke prevention in female 27. Further studies are needed to understand whether lower rates of OAC use in the elderly female are associated with differences in clinical outcomes, and if so, action is needed to eliminate unnecessary differences in OAC use by sex.
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- Andersson T, Magnuson A, Bryngelsson I-L. Patients with atrial fibrillation and outcomes of cerebral infarction in those with treatment of warfarin versus no warfarin with references to CHA2DS2-VASc score, age and sex – A Swedish nationwide observational study with 48.433 patients. PLos One. 2017; 12:e0176846.
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© Società Italiana di Gerontologia e Geriatria (SIGG) , 2019
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