[Core data set for real world data in multiple sclerosis: customization for latin america from a global task force recommendation]

INTRODUCTION

The primary objective of the core data set is to reduce heterogeneity and promote harmonization among data sources in EM, thereby reducing the time needed to execute real life data collection efforts. Recently, a group led by the Multiple Sclerosis Data Alliance has developed a core data set for collecting real-world data on multiple sclerosis (MS) globally. Our objective was to adapt this global data set to the needs of Latin America, so that it can be implemented by the registries already developed and in the process of development in the region.

MATERIAL AND METHODS

A working group was formed regionally, the core data set created globally was adapted (translation process into Spanish, incorporation of regional variables and consensus on variables to be used). Consensus was obtained through the remote Delphi methodology of a round of questionnaires and remote discussion of the core data set variables.

RESULTS

A total of 25 professionals from Latin America carried out the adaptation process between November 2022 and July 2023. Agreement was established on a core data set of nine categories and 45 variables, version 2023 to suggest its implementation in developed or developing registries, and MS cohorts in the region.

CONCLUSION

The core data set seeks to harmonize the variables collected by registries and cohorts in MS in Latin America in order to facilitate said collection and allow collaboration between sources. Its implementation will facilitate real life data collection and collaboration in the region.

Trabecular bone score in people with cystic fibrosis

People with cystic fibrosis (CF) are at increased risk of fractures. Our study found that low trabecular bone score (TBS) (a measure of bone strength) may help identify people with CF at risk of fractures especially when combined with bone density measured by DXA, age, hemoglobin A1c, and transplant status.

INTRODUCTION

People with cystic fibrosis (CF) are at increased risk of fractures. This study aims to evaluate the association of trabecular bone score (TBS) with fractures in CF.

METHODS

A cross-sectional study of adults with CF who completed bone density between 2009 and 2019. TBS was applied to lumbar spine studies.

RESULTS

A total of 202 people with CF were included. A history of fracture was present in 36 (17.8%) subjects. Patients with history of fractures had higher hemoglobin A1c (A1C) (7.8 ± 2.7% vs. 6.7 ± 1.7%, p = 0.024), lower femoral neck (FN) Z/T-score (- 1.05 ± 1.08 vs. - 0.44 ± 1.08, p = 0.012), and lower TBS (1.36 ± 0.13 vs. 1.40 ± 0.11, p = 0.05) compared to those without. Lung transplant recipients had a higher prevalence of fractures (50% vs. 14.1%, p < 0.001). The odds ratio (95%CI) of having a fracture for subjects with TBS (≤ 1.2 vs. > 1.2) stratified by FN Z/T-score (≤ - 2.0 or >  - 2.0) was 3.88 (0.92, 16.35), p = 0.07. ROC analysis showed TBS was significantly associated with fractures (p < 0.05); however, FN BMD was superior. A model combining FN BMD, age, A1c, transplant, and TBS improved ROC compared to FN BMD + age (0.837 vs. 0.779, p = 0.031).

CONCLUSIONS

TBS ≤ 1.2 may identify people with CF at high risk of fractures. A model combining FN BMD, age, A1c, transplant, and TBS was significantly associated with fractures compared to FN BMD + age. Future studies are needed to evaluate the prediction of fractures in people with CF using clinical and bone parameters.

[Argentinean consensus guidelines on the identification and clinical care of secondary progressive multiple sclerosis]

INTRODUCTION

The identification, diagnosis, follow-up, and treatment of patients with secondary progressive multiple sclerosis (SPMS) show significant differences between health care professionals in Argentina.

AIM

To provide consensus recommendations on the management of patients with SPMS in Argentina to optimize patient care.

DEVELOPMENT

A panel of expert neurologists from Argentina dedicated to the diagnosis and care of multiple sclerosis patients gathered during 2019 and 2020 to carry out a consensus recommendation on the diagnosis and treatment of SPMS patients in Argentina. To achieve consensus, the methodology of 'formal consensus-RAND/UCLA method' was used. Recommendations were established based on published evidence and the expert opinion. Recommendations focused on how to define SPMS and how to follow SPMS patients.

CONCLUSION

The recommendations of this consensus guidelines attempt to optimize the care of SPMS patients in Argentina.

Disease activity impacts disability progression in primary progressive multiple sclerosis

BACKGROUND

Although solid information on the natural history of primary progressive multiple sclerosis (PPMS) is available, evidence regarding impact of disease activity on PPMS progression remains controversial.

OBJECTIVE

To describe the clinical characteristics, presence or absence of MRI activity, and natural history of a PPMS cohort from two referral centers in Argentina and assess whether clinical and/or radiological disease activity correlated with disability worsening.

METHODS

Retrospective study conducted at two MS clinics in Buenos Aires, Argentina, through comparative analysis of patients with and without evidence of disease activity.

RESULTS

Clinical and/or radiologic activity was presented in 56 (31%) of 178 patients. When stratified by age at onset, we found that for every 10 years of increase in age at onset, risk of reaching EDSS scores of 4 and 6 increased by 26% and 31%, respectively (EDSS 4: HR 1.26, CI 95%: 1.06-1.50; EDSS 6: HR 1.31, CI 95%: 1.06-1.62). Patients who presented clinical exacerbations reached EDSS scores of 6, 7 and 8 faster than those without associated exacerbations (p = 0.009, p = 0.016 and p = 0.001, respectively). Likewise, patients who presented gadolinium-enhancing lesions during the course of disease reached EDSS scores of 7 earlier (p = 0.002).

CONCLUSION

Older age at onset and presence of clinical and/or radiological disease activity correlated with accelerated disability progression in this cohort of PPMS patients.

[Is endovenous thrombolysis safety and efficacy in ischemic stroke comparable between patients aged over and above 80 years? Experience from an Argentinean cohort]

INTRODUCTION

Enrollment of patients aged above 80 years in trials assessing endovenous thrombolysis (rt-PA) was scarce. The goal of this study is to compare safety and efficacy of endovenous rt-PA between patients aged above 80 and those below 80 years.

PATIENTS AND METHODS

A cohort of patients who received rt-PA was prospectively followed. Length of hospital stay, bleeding incidence, in-hospital mortality and 90 days' clinical outcome was compared between patients aged above 80 and those below 80 years.

RESULTS

Of 1996 patients admitted at our hospital with ischemic stroke between October 2005 and January 2016, 180 received rt-PA (9%). Mean age was 77 ± 10 years, being 55% of the women. Comparing patients aged above 80 with those below 80 years, in the latter the length of hospital stay was longer with a median length of 15 days (IQR: 6-19) vs 7 days (IQR: 4-12; p = 0.001) and 90 days' clinical outcome was worse (modified Rankin scale 0-1 of 24% vs 41%; p = 0.001). Admission ASPECTS score, bleeding incidence and in-hospital mortality showed no significant differences between both groups. Patients aged over 80 arrived to the hospital earlier (97 ± 34 vs 113 ± 45 min; p = 0.01), however door-to-needle time was longer.

CONCLUSIONS

Endovenous thrombolysis in patients aged above 80 years was safe, although its efficacy in assuring a better clinical outcome was not as pronounced as in patients below 80 years.

Gender ratio trends over time in multiple sclerosis patients from Argentina

Several studies in multiple sclerosis (MS) suggest a trend of increasing disease frequency in women during the last decades. A direct comparison of gender ratio trends among MS populations from Argentina remains to be carried out. The objective of the study was to compare gender ratio trends, over a 50-year span in MS populations from Argentina.

METHODS

multicenter study that included patients from 14 MS Centers of Argentina. Patients with definite MS with birth years ranging from 1940 to 1989 were included. Gender ratios were calculated by five decades based on year of birth and were adjusted for the F/M born-alive ratio derived from the Argentinean national registry of births. The F/M ratios were calculated using a multivariate logistic regression per five decades by the year of birth approach. Analyses were performed using Stata 10.1.

RESULTS

1069 patients were included. Gender ratios showed a significant increase from the first to the last decade in the whole MS sample (from 1.8 to 2.7; p value for trend=0.023). The Gender ratio did not show differences considering MS subtype.

CONCLUSION

our study showed a modest increase of the F/M ratio (from 1.8 to 2.7) over time among patients affected by MS in Argentina.

ALBA Screening Instrument (ASI): A brief screening tool for Lewy Body Dementia

BACKGROUND

Early detection of neurodegenerative diseases is essential for treatment and proper care of these patients. Screening tools available today are effective for several types of dementia. However, there is no one specific for Lewy Body Dementia (LBD).

OBJECTIVES

The aim of this paper is to present a tool for early detection of LBD, accessible even for non-medical staff.

METHODS

We stratified subjects (MMSE>20) into four groups: health controls (HC), Mild Cognitive Impairment (MCI), LBD and other dementias (Alzheimer and vascular). All subjects (age range 50-90) were examined with a comprehensive neuropsychological and neuropsychiatric evaluation, as well as neuroimaging to differentiate diagnosis between groups, fulfilling corresponding criteria. Both neurologists and neuropsychologists were blind to the performance on clinical evaluations and ASI, respectively. The sensitivity and specificity of the instrument were determined to differentiate LBD from other groups.

RESULTS

We evaluated 427 subjects, 91 HC, 140 with MCI and 196 with dementia. In the dementia group, 75 were diagnosed with LBD and 121 with other dementias. ASI total score was 12.7±0.4 for LBD, 2.9±0.2 for HC, 5±0.7 for MCI, and 5.4±2.6 for other causes of dementia. ROC curve analysis showed a sensitivity of 90.7% and a specificity of 93.6% stands, with 9 as the cutoff with better test performance compared against other groups.

CONCLUSION

ASI is a brief screening tool for LBD with high sensitivity and specificity and useful even for non-medical staff.

Increasing incidence of multiple sclerosis among women in Buenos Aires: a 22 year health maintenance organization based study

Studies in multiple sclerosis (MS) suggest a trend of increasing disease prevalence and incidence, and especially, a disproportional increase in the incidence of multiple sclerosis in women. The objective of this study was to evaluate the incidence of MS over 22 years and to determine the ratio in incidence of men to women in a health maintenance organization from Buenos Aires, Argentina. The population was made up of all members of a hospital-based HMO affiliated between January 1992 and December 2013. Each person was followed contributing time at risk. Cases with definite diagnosis of MS were included. Incidence density was calculated with 95 % confidence intervals and compared between women and men. 165,456 subjects were followed for a total of 1,488,575 person-years, of whom 42 developed MS. Incidence density was 3/100,000 person-years (95 % CI 2.1-3.5/100,000 person-years). During this period (1992-2013), the incidence rate in women increased from 1/100,000 (95 % CI 0.8-1.6) to 4.9/100,000 (95 % CI 4.1-5.4) (p < 0.001), while in men the incidence ranged from 1.4/100,000 (95 % CI 1-1.7) to 1.8 (1.3-2.1) (p = 0.16). Incidence density during the study period increased significantly in women but not in men. This is the first report of this phenomenon in Latin America region.

Disease onset in familial and sporadic multiple sclerosis in Argentina

The present study was carried out to assess if there is an anticipation of age at onset in younger generations of familial multiple sclerosis (FMS) vs. sporadic MS (SMS) in Argentina.

METHODS

multicenter study that included patients from 14 MS Centers of Argentina. Patients were considered as FMS if they had in their family at least one relative of first or second degree diagnosed with MS; otherwise, patients were considered to have SMS. We compared the age at onset between familial and sporadic cases as well as the age at onset between relatives from different generations in FMS vs. SMS.

RESULTS

1333 patients were included, 97 of them were FMS (7.3%). A lower age at onset in the younger generations of FMS cases was found compared with older generations of FMS as well as. SMS cases (24.1±3.7 years vs. 30.3±5.7 years, and 32.4±9.4 respectively; p<0.001). No differences were observed between older generations of FMS vs. SMS cases (p=0.12).

CONCLUSION

we observed an anticipation of age at onset of MS in younger generations of patients with FMS vs. older generations of FMS and SMS.

Application of the McDonald 2010 criteria for the diagnosis of multiple sclerosis in an Argentinean cohort of patients with clinically isolated syndromes

Background:

The International Panel on Diagnosis of Multiple Sclerosis has proposed new magnetic resonance imaging (MRI) criteria for the diagnosis of multiple sclerosis (MS) in patients with clinically isolated syndrome (CIS). We aimed to evaluate these new criteria in a cohort of patients from Buenos Aires, Argentina.

Methods:

Patients with CIS, in whom MRI was performed within three months of onset of symptoms, were included between January 2005–June 2010. Poser or McDonald 2005 criteria were used as gold standard diagnostic criteria for MS. MRI was assessed by a blind evaluator identifying recently diagnostic MS criteria. New criteria sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy were determined.

Results:

Altogether 101 patients were included. Of these, 86 patients converted to MS (McDonald 2005/Poser) during the follow-up. The mean follow-up time was 7.3±3.2 years (range 1.8–11 years). Sensitivity was 84%, specificity 80%, PPV 96%, NPV 46% and accuracy 82%. The sub-analysis applied only to non-European descendants (mestizos, natives and zambos) showed a high level of accuracy for these new diagnostic criteria in this local ethnic/genetic population (sensitivity 77%, specificity 72%, PPV 94%, NPV 38%).

Conclusions:

This study assessing McDonald 2010 criteria in a Latin-American population may contribute to its international validation.

[LACTRIMS consensus document for the pharmacological treatment of the multiple sclerosis and its clinical variants]

INTRODUCTION. Multiple sclerosis (MS) it is not considered any more a rare disease in Latin America. Most of the Latin American countries have reported moderate or lower prevalence data. However only very few countries have developed therapeutic guidelines. LACTRIMS prepared this consensus document with specific recommendations for the treatment of the disease. DEVELOPMENT. Experts on treatment and clinical research on MS were invited by LACTRIMS in order to generate a initial document to be discussed in Quito, Ecuador. Several groups were organized in relation of the different clinical variants. These groups were coordinated by experts leaders and prepared a preliminary document that was discussed in Quito during July 8th and 9th, 2011. Finally the final version was submitted to the members and delegates of LACTRIMS in most of the Latin American countries who were able to make modifications and suggest changes to the final manuscript. CONCLUSIONS. Based on the different evidence levels and the AGREE criteria, the clinical variants were reviewed and recommendations were made for the use of drugs and different modifying disease therapeutic agents.

The epidemiology of multiple sclerosis in Latin America and the Caribbean: a systematic review

The incidence and prevalence of multiple sclerosis (MS) varies geographically as shown through extensive epidemiological studies performed mainly in developed countries. Nonetheless, scant data is available in Latin America and the Caribbean (LAC). The objective of this review is to assess epidemiological data of MS in LAC. We conducted a systematic review of published articles and gray literature from January 1995 to May 2011. Twenty-two studies met the inclusion criteria after full-text review. Incidence data were found in only three studies and ranged from 0.3 to 1.9 annual cases per 100,000 person-years. Prevalence was reported in 10 studies and ranged from 0.83 to 21.5 cases per 100,000 inhabitants. The most prevalent subtype of MS was the relapsing–remitting form (48% to 91% of the series). No data about mortality were found. This study showed low frequency for MS in LAC compared with North American and European countries. The role of environmental and genetic factors should be well studied, providing new insights about its etiology.

Oligoclonal bands in multiple sclerosis patients: worse prognosis?

INTRODUCTION

Cerebrospinal fluid (CSF) oligoclonal bands (OB) imply intrathecal immunoglobulin synthesis and B-cell immune process. There is scarce evidence of OB having a role in disease prognosis. The objective of the present study was to determine OB's prognostic value regarding disease progression.

METHODS

Between January 1994 and January 2007, relapsing-remitting MS (RRMS) patients in which OB were determined were included. Demographic, clinical aspects and presence of OB were analyzed. We compared OB+ versus OB- patients regarding progression to expanded disability status scale (EDSS) of 6·0 and to secondary progressive MS (SPMS). Cox proportional hazard models were used to compare the outcome between groups. P values <0·05 were considered significant.

RESULTS

One hundred and ninety-six patients were included. In 176 patients (90%), the CSF showed type II OB, 20 (10%) patients were OB negative. There were no differences between age, clinical presentation and EDSS at onset or in the immunomodulatory treatment received between OB+ and OB- patients. Sixty-two (31·6%) patients converted to SPMS during the follow-up, 59 (33·5%) were OB+ and 3 (15%) were OB-. EDSS of 6 was recorded in 56 (28·5%) patients during the follow-up; 54 (31%) were OB+ while only 2 (10%) OB- patients reached this outcome (reach SP phase, P = 0·032; HR: 2·2; 95% CI: 1·3-7·5 and EDSS of 6, P = 0·037; HR: 1·9; 95% CI: 1·3-8·5).

CONCLUSION

We observed during the follow-up that OB- patients had a better prognosis and milder disability compared to OB+ patients.

Towards establishing MS prevalence in Latin America and the Caribbean

A very high prevalence of multiple sclerosis (MS) has been reported in some Western European and North American countries. The few surveys of MS epidemiology in South America reveal lower prevalence rates, implying that susceptibility varies between distinct ethnic groups, thus forming an important determinant of the geographic distribution of the disease. The objective of this study is to review MS prevalence estimates in different Latin American and Caribbean countries. We reviewed surveys of regional MS prevalence from 1991 to 2011. Sources included an online database, authors' reports and proceedings or specific lectures from regional conferences. We obtained a total of 30 prevalence surveys from 15 countries, showing low/medium MS prevalence rates. Both the number and the quality of prevalence surveys have greatly improved in this region over recent decades. This is the first collaborative study to map the regional frequency of MS. Establishment of standardized methods and joint epidemiological studies will advance future MS research in Latin America and the Caribbean.

The frequency of CSF oligoclonal banding in multiple sclerosis increases with latitude

BACKGROUND

With the advent of MRI scanning, the value of lumbar puncture to assess oligoclonal band (OCB) status-for the diagnosis of multiple sclerosis (MS) is increasingly uncertain. One major issue is that the reported frequency of cerebrospinal fluid (CSF)-restricted oligoclonal banding for the diagnosis of MS varies considerably in different studies. In addition, the relationship between OCB positivity and disease outcome remains uncertain, as reported studies are generally too small to assess comparative disability outcomes with sufficient power.

METHODS

In order to further investigate variation of OCB positivity in patients with MS, we utilized MSBase, a longitudinal, Web-based collaborative MS outcomes registry following clinical cohorts in several continents and latitudes. We also assessed whether OCB positivity affects long-term disability outcome.

RESULTS

A total of 13,242 patient records were obtained from 37 MS specialist centres in 19 different countries. OCB status was documented in 4481 (34%) patients and 80% of these were OCB positive. The presence of OCB was associated with degree of latitude (p = 0.02). Furthermore, the outcome of patients negative for CSF-specific OCB was significantly better in comparison to the OCB positive patients, as assessed by Expanded Disability Status Scale change (p < 0.001).

CONCLUSIONS

The results of this study indicate that latitude could explain some of the inconsistencies in OCB status reported in different populations. The study confirms that OCB positivity in MS is associated with a worse long-term prognosis.

[Acute transverse myelitis in Buenos Aires, Argentina. A retrospective cohort study of 8 years follow up]

INTRODUCTION

Epidemiological studies on acute transverse myelitis (ATM) in South America are scarce. The aim of our study was to describe demographic, clinical and para-clinical features of patients with ATM in a health care organisation in Buenos Aires. A further objective was to determine the aetiologies of ATM.

METHODS

All patients diagnosed with ATM between June 1, 2002 and June 30, 2010 were retrospectively identified, using the Transverse Myelitis Consortium Working Group criteria.

RESULTS

A total of 40 patients diagnosed with ATM, (24 females, 60%) were included. The mean follow-up was 57 ± 8 months. The principal cause of myelitis found was ATM secondary to demyelinating disease (55%). Idiopathic ATM was diagnosed in 15 (37.5%) cases in the sample. The majority of patients had an extensive cord lesion (50%) detectable with spinal MRI.

CONCLUSION

There are few epidemiological studies concerning ATM in Argentina, and we believe that it is important to be aware of the manner in which this condition manifests itself in this region. We would therefore be able to compare them with studies previously published in other countries.