Examinando por Autor "Oveisgharan, Shahram"

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  • Publicación
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    Global and regional effects of potentially modifiable risk factors associated with acute stroke in 32 countries (INTERSTROKE) : A case-control study
    (2016-07-15) O’Donnell, Martin J.; Chin, Siu Lim; Rangarajan, Sumathy; Xavier, Denis; Liu, Lisheng; Zhang, Hongye; Rao Melacini, Purnima; Zhang, Xiaohe; Pais, Prem; Agapay, Steven; Lopez-Jaramillo, Patricio; Damasceno, Albertino; Langhorne, Peter; McQueen, Matthew J.; Rosengren, Annika; Dehghan, Mahshid; Hankey, Graeme J.; Dans, Antonio; ElSayed, Ahmed; Avezum, Alvaro; Mondo, Charles; Diener, Hans Christoph; Ryglewicz, Danuta; Czlonkowska, Anna; Pogosova, Nana; Weimar, Christian; Iqbal, Romaina; Diaz, Rafael; Yusoff, Khalid; Yusufali, Afzalhussein; Oguz, Aytekin; Wang, Xingyu; Penaherrera, Ernesto; Lanas, Fernando; Ogah, Okechukwu S.; Ogunniyi, Adesola; Iversen, Helle K.; Malaga, German; Rumboldt, Zvonko; Oveisgharan, Shahram; Hussain, Fawaz Al; Magazi, Daliwonga; Nilanont, Yongchai; Ferguson, John; Paré, Guillaume; Yusuf, Salim; INTERSTROKE investigators
    Background Stroke is a leading cause of death and disability, especially in low-income and middle-income countries. We sought to quantify the importance of potentially modifiable risk factors for stroke in different regions of the world, and in key populations and primary pathological subtypes of stroke. Methods We completed a standardised international case-control study in 32 countries in Asia, America, Europe, Australia, the Middle East, and Africa. Cases were patients with acute first stroke (within 5 days of symptom onset and 72 h of hospital admission). Controls were hospital-based or community-based individuals with no history of stroke, and were matched with cases, recruited in a 1:1 ratio, for age and sex. All participants completed a clinical assessment and were requested to provide blood and urine samples. Odds ratios (OR) and their population attributable risks (PARs) were calculated, with 99% confidence intervals. Findings Between Jan 11, 2007, and Aug 8, 2015, 26 919 participants were recruited from 32 countries (13 447 cases [10 388 with ischaemic stroke and 3059 intracerebral haemorrhage] and 13 472 controls). Previous history of hypertension or blood pressure of 140/90 mm Hg or higher (OR 2·98, 99% CI 2·72–3·28; PAR 47·9%, 99% CI 45·1–50·6), regular physical activity (0·60, 0·52–0·70; 35·8%, 27·7–44·7), apolipoprotein (Apo)B/ApoA1 ratio (1·84, 1·65–2·06 for highest vs lowest tertile; 26·8%, 22·2–31·9 for top two tertiles vs lowest tertile), diet (0·60, 0·53–0·67 for highest vs lowest tertile of modified Alternative Healthy Eating Index [mAHEI]; 23·2%, 18·2–28·9 for lowest two tertiles vs highest tertile of mAHEI), waist-to-hip ratio (1·44, 1·27–1·64 for highest vs lowest tertile; 18·6%, 13·3–25·3 for top two tertiles vs lowest), psychosocial factors (2·20, 1·78–2·72; 17·4%, 13·1–22·6), current smoking (1·67, 1·49–1·87; 12·4%, 10·2–14·9), cardiac causes (3·17, 2·68–3·75; 9·1%, 8·0–10·2), alcohol consumption (2·09, 1·64–2·67 for high or heavy episodic intake vs never or former drinker; 5·8%, 3·4–9·7 for current alcohol drinker vs never or former drinker), and diabetes mellitus (1·16, 1·05–1·30; 3·9%, 1·9–7·6) were associated with all stroke. Collectively, these risk factors accounted for 90·7% of the PAR for all stroke worldwide (91·5% for ischaemic stroke, 87·1% for intracerebral haemorrhage), and were consistent across regions (ranging from 82·7% in Africa to 97·4% in southeast Asia), sex (90·6% in men and in women), and age groups (92·2% in patients aged ≤55 years, 90·0% in patients aged >55 years). We observed regional variations in the importance of individual risk factors, which were related to variations in the magnitude of ORs (rather than direction, which we observed for diet) and differences in prevalence of risk factors among regions. Hypertension was more associated with intracerebral haemorrhage than with ischaemic stroke, whereas current smoking, diabetes, apolipoproteins, and cardiac causes were more associated with ischaemic stroke (p<0·0001). Interpretation Ten potentially modifiable risk factors are collectively associated with about 90% of the PAR of stroke in each major region of the world, among ethnic groups, in men and women, and in all ages. However, we found important regional variations in the relative importance of most individual risk factors for stroke, which could contribute to worldwide variations in frequency and case-mix of stroke. Our findings support developing both global and region-specific programmes to prevent stroke. Funding Canadian Institutes of Health Research, Heart and Stroke Foundation of Canada, Canadian Stroke Network, Health Research Board Ireland, Swedish Research Council, Swedish Heart and Lung Foundation, The Health & Medical Care Committee of the Regional Executive Board, Region Västra Götaland (Sweden), AstraZeneca, Boehringer Ingelheim (Canada), Pfizer (Canada), MSD, Chest, Heart and Stroke Scotland, and The Stroke Association, with support from The UK Stroke Research Network.
  • Publicación
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    Mendelian Genes and Risk of Intracerebral Hemorrhage and Small-Vessel Ischemic Stroke in Sporadic Cases
    (2017-08) Lopez-Jaramillo, Patricio; Chong, Michael; O’Donnell, Martin J.; Thijs, Vincent; Dans, Antonio; Gómez Arbeláez, Diego; Mondo, Charles; Czlonkowska, Anna; Skowronska, Marta; Oveisgharan, Shahram; Yusuf, Salim; Paré, Guillaume
    Background and Purpose—Mendelian strokes are rare genetic disorders characterized by early-onset small-vessel stroke. Although extensively studied among families with syndromic features, whether these genes affect risk among sporadic cases is unknown. Methods—We sequenced 8 genes responsible for Mendelian stroke in a case–control study of sporadic stroke cases (≤70 years). Participants included 1251 primary stroke cases of small-vessel pathology (637 intracerebral hemorrhage and 614 small-vessel ischemic stroke cases) and 1716 controls from the INTERSTROKE study (Study of the Importance of Conventional and Emerging Risk Factors of Stroke in Different Regions and Ethnic Groups of the World). Results—Overall, the prevalence of canonical disease-causing mutations was 0.56% in cases and 0.23% in controls (odds ratio=1.89; 95% confidence interval, 0.54–7.57; P=0.33). CADASIL (Cerebral Autosomal Dominant Arteriopathies with Subcortical Infarcts and Leukoencephalopathies) mutations were more frequent among cases (0.48%) than controls (0.23%) but were not significantly associated with stroke risk (odds ratio=2.03; 95% confidence interval, 0.58–8.02; P=0.27). Next, we included all rare nonsynonymous mutations to investigate whether other types of mutations may contribute to stroke risk. Overall, 13.5% of cases and 14.2% of controls were carriers of at least one rare nonsynonymous mutation among the 8 Mendelian stroke genes. Mutation carriers were not at elevated risk of stroke (odds ratio=0.93; 95% confidence interval, 0.75–1.16; P=0.55). Conclusions—In the absence of syndromic features and family history of stroke, screening for Mendelian mutations among small-vessel stroke patients is unlikely to have high diagnostic utility.
  • Publicación
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    Practice patterns and outcomes after stroke across countries at different economic levels (INTERSTROKE): An international observational study
    (2018-05) Langhorne, Peter; O'Donnell, Martin J.; Lim Chin, Siu; Zhang, Hongye; Xavier, Denis; Avezum, Alvaro; Mathur, Nandini; Turner, Melanie; MacLeod, Mary Joan; Lopez-Jaramillo, Patricio; Damasceno, Albertino; Hankey, Graeme J.; Dans, Antonio; ElSayed, Ahmed; Mondo, Charles; Wasay, Mohammad; Czlonkowska, Anna; Weimar, Christian; Hussein Yusufali, Afzal; AlHussain, Fawaz; Lisheng, Liu; Diener, Hans Christoph; Ryglewicz, Danuta; Pogosova, Nana; Iqbal, Romaina; Diaz, Rafael; Yusoff, Khalid; Oguz, Aytekin; Wang, Xingyu; Penaherrera, Ernesto; Lanas, Fernando; Ogah, Okechukwu S.; Ogunniyi, Adesola; Iversen, Helle K.; Malaga, German; Rumboldt, Zvonko; Magazi, Daliwonga; Nilanont, Yongchai; Rosengren, Annika; Oveisgharan, Shahram; Yusuf, Salim; On behalf of the INTERSTROKE collaborators
    Background: Stroke disproportionately affects people in low-income and middle-income countries. Although improvements in stroke care and outcomes have been reported in high-income countries, little is known about practice and outcomes in low and middle-income countries. We aimed to compare patterns of care available and their association with patient outcomes across countries at different economic levels. Methods: We studied the patterns and effect of practice variations (ie, treatments used and access to services) among participants in the INTERSTROKE study, an international observational study that enrolled 13 447 stroke patients from 142 clinical sites in 32 countries between Jan 11, 2007, and Aug 8, 2015. We supplemented patient data with a questionnaire about health-care and stroke service facilities at all participating hospitals. Using univariate and multivariate regression analyses to account for patient casemix and service clustering, we estimated the association between services available, treatments given, and patient outcomes (death or dependency) at 1 month. Findings: We obtained full information for 12 342 (92%) of 13 447 INTERSTROKE patients, from 108 hospitals in 28 countries; 2576 from 38 hospitals in ten high-income countries and 9766 from 70 hospitals in 18 low and middle-income countries. Patients in low-income and middle-income countries more often had severe strokes, intracerebral haemorrhage, poorer access to services, and used fewer investigations and treatments (p<0·0001) than those in high-income countries, although only differences in patient characteristics explained the poorer clinical outcomes in low and middle-income countries. However across all countries, irrespective of economic level, access to a stroke unit was associated with improved use of investigations and treatments, access to other rehabilitation services, and improved survival without severe dependency (odds ratio [OR] 1·29; 95% CI 1·14–1·44; all p<0·0001), which was independent of patient casemix characteristics and other measures of care. Use of acute antiplatelet treatment was associated with improved survival (1·39; 1·12–1·72) irrespective of other patient and service characteristics. Interpretation: Evidence-based treatments, diagnostics, and stroke units were less commonly available or used in low and middle-income countries. Access to stroke units and appropriate use of antiplatelet treatment were associated with improved recovery. Improved care and facilities in low-income and middle-income countries are essential to improve outcomes. Funding: Chest, Heart and Stroke Scotland.
  • Publicación
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    Renal Impairment and Risk of Acute Stroke: The INTERSTROKE Study
    (Karger Publishers, 2021-05-05) Smyth, Andrew; Judge, Conor; Wang, Xingyu; Pare, Guillaume; Rangarajan, Sumathy; Canavan, Michelle; Chin, Siu Lim; Al-Hussain, F.; Yusufali, Afzalhussein; ElSayed, Ahmed; Damasceno, Albertino; Avezum, Alvaro; Czlonkowska, Anna; Rosengren, Annika; Dans, Antonio; Oguz, Aytekin; Mondo, Charles; Weimar, Christian; Ryglewicz, Danuta; Xavier, Denis; Lanas, Fernando; Malaga, German; Hankey, Graeme J.; Iversen, Helle K.; Zhang, Hongye; Yusoff, Khalid; Pogosova, Nana; Lopez-Jaramillo, Patricio; Langhorne, Peter; Diaz, Rafael; Oveisgharan, Shahram; Yusuf, Salim; O’Donnell, Martin J.; The INTERSTROKE investigators; Masira
    Background: Previous studies reported an association of renal impairment with stroke, but there are uncertainties underpinning this association. Aims: We explored if the association is explained by shared risk factors or is independent and whether there are regional or stroke subtype variations. Methods: INTERSTROKE is a case-control study and the largest international study of risk factors for first acute stroke, completed in 27 countries. We included individuals with available serum creatinine values and calculated estimated glomerular filtration rate (eGFR). Renal impairment was defined as eGFR <60 mL/min/1.73 m2. Multivariable conditional logistic regression was used to determine the association of renal function with stroke. Results: Of 21,127 participants, 41.0% were female, the mean age was 62.3 ± 13.4 years, and the mean eGFR was 79.9 ± 23.5 mL/min/1.73 m2. The prevalence of renal impairment was higher in cases (22.9% vs. 17.7%, p < 0.001) and differed by region (p < 0.001). After adjustment, lower eGFR was associated with increased odds of stroke. Renal impairment was associated with increased odds of all stroke (OR 1.35; 95% CI: 1.24–1.47), with higher odds for intracerebral hemorrhage (OR 1.60; 95% CI: 1.35–1.89) than ischemic stroke (OR 1.29; 95% CI: 1.17–1.42) (pinteraction 0.12). The largest magnitudes of association were seen in younger participants and those living in Africa, South Asia, or South America (pinteraction < 0.001 for all stroke). Renal impairment was also associated with poorer clinical outcome (RRR 2.97; 95% CI: 2.50–3.54 for death within 1 month). Conclusion: Renal impairment is an important risk factor for stroke, particularly in younger patients, and is associated with more severe stroke and worse outcomes.
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    Urinary Sodium and Potassium, and Risk of Ischemic and Hemorrhagic Stroke (INTERSTROKE). A Case-Control Study
    (Oxford Academic, 2021-04-01) Judge, Conor; O’Donnell, Martin J.; Hankey, Graeme J.; Rangarajan, Sumathy; Lim Chin, Siu; Rao-Melacini, Purnima; Ferguson, John; Smyth, Andrew; Xavier, Denis; Lisheng, Liu; Zhang, Hongye; Lopez-Jaramillo, Patricio; Damasceno, Albertino; Langhorne, Peter; Rosengren, Annika; Dans, Antonio; Elsayed, Ahmed; Avezum, Alvaro; Mondo, Charles; Ryglewicz, Danuta; Czlonkowska, Anna; Pogosova, Nana; Weimar, Christian; Diaz, Rafael; Yusoff, Khalid; Yusufali, Afzalhussein; Oguz, Aytekin; Wang, Xingyu; Lanas, Fernando; Ogah, Okechukwu S.; Ogunniyi, Adesola; Iversen, Helle K.; Malaga, German; Rumboldt, Zvonko; Oveisgharan, Shahram; Hussain, Fawaz Al; Yusuf, Salim; INTERSTROKE investigators; Masira
    BACKGROUND Although low sodium intake (<2 g/day) and high potassium intake (>3.5 g/day) are proposed as public health interventions to reduce stroke risk, there is uncertainty about the benefit and feasibility of this combined recommendation on prevention of stroke. METHODS We obtained random urine samples from 9,275 cases of acute first stroke and 9,726 matched controls from 27 countries and estimated the 24-hour sodium and potassium excretion, a surrogate for intake, using the Tanaka formula. Using multivariable conditional logistic regression, we determined the associations of estimated 24-hour urinary sodium and potassium excretion with stroke and its subtypes. RESULTS Compared with an estimated urinary sodium excretion of 2.8–3.5 g/day (reference), higher (>4.26 g/day) (odds ratio [OR] 1.81; 95% confidence interval [CI], 1.65–2.00) and lower (<2.8 g/day) sodium excretion (OR 1.39; 95% CI, 1.26–1.53) were significantly associated with increased risk of stroke. The stroke risk associated with the highest quartile of sodium intake (sodium excretion >4.26 g/day) was significantly greater (P < 0.001) for intracerebral hemorrhage (ICH) (OR 2.38; 95% CI, 1.93–2.92) than for ischemic stroke (OR 1.67; 95% CI, 1.50–1.87). Urinary potassium was inversely and linearly associated with risk of stroke, and stronger for ischemic stroke than ICH (P = 0.026). In an analysis of combined sodium and potassium excretion, the combination of high potassium intake (>1.58 g/day) and moderate sodium intake (2.8–3.5 g/day) was associated with the lowest risk of stroke. CONCLUSIONS The association of sodium intake and stroke is J-shaped, with high sodium intake a stronger risk factor for ICH than ischemic stroke. Our data suggest that moderate sodium intake—rather than low sodium intake—combined with high potassium intake may be associated with the lowest risk of stroke and expected to be a more feasible combined dietary target.
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    Variations in knowledge, awareness and treatment of hypertension and stroke risk by country income level
    (BMJ Journals, 2020-12-14) O’ Donnell, Martin; Hankey, Graeme J.; Rangarajan, Sumathy; Chin, Siu Lim; Rao-Melacini, Purnima; Ferguson, John; Xavier, Denis; Lisheng, Liu; Zhang, Hongye; Pais, Prem; Lopez-Jaramillo, Patricio; Damasceno, Albertino; Langhorne, Peter; Rosengren, Annika; Dans, Antonio L.; Elsayed, Ahmed; Avezum, Alvaro; Mondo, Charles; Smyth, Andrew; Judge, Conor; Diener, Hans-Christoph; Ryglewicz, Danuta; Czlonkowska, Anna; Pogosova, Nana; Weimar, Christian; Iqbal, Romana; Diaz, Rafael; Yusoff, Khalid; Yusufali, Afzalhussein; Oguz, Aytekin; Wang, Xingyu; Penaherrera, Ernesto; Lanas, Fernando; Ogah, Okechukwu Samuel; Ogunniyi, Adensola; Iversen, Helle K.; Malaga, German; Rumboldt, Zvonko; Oveisgharan, Shahram; AlHussain, Fawaz; Daliwonga, Magazi; Nilanont, Yongchai; Yusuf, Salim; Masira
    ABSTRACT Objective Hypertension is the most important modifiable risk factor for stroke globally. We hypothesised that country-income level variations in knowledge, detection and treatment of hypertension may contribute to variations in the association of blood pressure with stroke. Methods We undertook a standardised case-control study in 32 countries (INTERSTROKE). Cases were patients with acute first stroke (n=13 462) who were matched by age, sex and site to controls (n=13 483). We evaluated the associations of knowledge, awareness and treatment of hypertension with risk of stroke and its subtypes and whether this varied by gross national income (GNI) of country. We estimated OR and population attributable risk (PAR) associated with treated and untreated hypertension. Results Hypertension was associated with a graded increase in OR by reducing GNI, ranging from OR 1.92 (99% CI 1.48 to 2.49) to OR 3.27 (2.72 to 3.93) for highest to lowest country-level GNI (pheterogeneity<0.0001). Untreated hypertension was associated with a higher OR for stroke (OR 5.25; 4.53 to 6.10) than treated hypertension (OR 2.60; 2.32 to 2.91) and younger age of first stroke (61.4 vs 65.4 years; p<0.01). Untreated hypertension was associated with a greater risk of intracerebral haemorrhage (OR 6.95; 5.61 to 8.60) than ischaemic stroke (OR 4.76; 3.99 to 5.68). The PAR associated with untreated hypertension was higher in lowerincome regions, PAR 36.3%, 26.3%, 19.8% to 10.4% by increasing GNI of countries. Lifetime nonmeasurement of blood pressure was associated with stroke (OR 1.80; 1.32 to 2.46). Conclusions Deficits in knowledge, detection and treatment of hypertension contribute to higher risk of stroke, younger age of onset and larger proportion of intracerebral haemorrhage in lower-income countries.