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BACKGROUND: HTLV-1/2 exhibit a widespread distribution globally and are associated with severe clinical manifestations, necessitating precise viral identification for diagnosis. Currently, there are no official diagnostic guidelines, and a variety of published protocols exists. We introduce an enhanced nested real-time PCR technique followed by high-resolution melting (rtPCR-HRM), designed to offer a cost-effective and straightforward tool for the simultaneous identification of both viruses. METHODS: The technique was tested in a retrospective, blinded study, involving a total panel of 110 samples, of which 47 were positive for HTLV-1, 12 for HTLV-2, and 51 tested negatives. Additionally, we compared the performance of this technique with a line immunoassay (LIA). RESULTS: The results demonstrate 100% sensitivity, specificity, and diagnostic accuracy for both viruses. Sensitivity analysis indicated that at least 1 viral copy of HTLV-1 and 14.4 viral copies of HTLV-2 could be reliably detected. CONCLUSIONS: Our results indicate that rtPCR-HRM is effective in confirming HTLV-1 and HTLV-2 infection, important in Latin American countries where both viruses circulate. Furthermore, the proposed strategy provides a new tool that can be used to resolve indeterminate cases identified by Western blot, with the added advantage of being faster and simpler than n-PCR and more cost-effective than other probe-based RT-PCRs.

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OBJECTIVE: From the first-generation options available in 1985, tests to detect HIV-1 specific antibodies have increased its sensitivity and specificity. HIV-1 and SARS-CoV-2 surface glycoproteins present a certain degree of homology and shared epitope motifs, which results of relevance as both pandemics coexist. Here, we aimed to evaluate the rate of false-positive HIV serology results among individuals with COVID-19 diagnosis and in vaccinated individuals. DESIGN: A retrospective analysis of the samples stored at the Infectious Disease Biobank in Argentina from donors with previous COVID-19 diagnosis or anti-SARS-CoV-2 vaccination. METHODS: Plasma samples were analyzed using Genscreen Ultra HIV Ag-Ab. In those with a positive result, the following assays were also performed: ELISA lateral flow Determine Early Detect; RecomLine HIV-1 & HIV-2 IgG and Abbott m2000 RealTime PCR for HIV-1 viral load quantification. In all samples, the presence of anti-SARS-CoV-2 IgG antibodies was evaluated by ELISA using the COVIDAR kit. Statistical analysis was done using Pearson's and Fisher's exact chi-squared test; Mann-Whitney and Kruskal-Wallis tests. RESULTS: Globally, the false-positive HIV ELISA rate was 1.3% [95% confidence interval (95% CI) 0.66-2.22; χ2  = 4.68, P  = 0.03, when compared with the expected 0.4% false-positive rate]. It increased to 1.4% (95% CI 0.70-2.24, χ2  = 5.16, P  = 0.02) when only samples from individuals with previous COVID-19 diagnosis, and to 1.8% (95% CI 0.91-3.06, χ2  = 7.99, P  = 0.005) when only individuals with detectable IgG SARS-CoV-2 antibodies were considered. CONCLUSION: This higher occurrence of HIV false-positive results among individuals with detectable antibodies against Spike SARS-CoV-2 protein should be dispersed among virology testing settings, health providers, and authorities.

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AIMS: Isometric indexation of cardiac structures fails in patients with overweight. The aim of the study was to evaluate the LA indexed volume (LAVOL), left ventricular end-diastolic diameter (LVEDD), left ventricular mass index (LVMI), and the aortic sinus diameter (AOSD) in healthy subjects with normal and high BMI and find the allometric correction exponent. METHODS: Four hundred and thirty patients without cardiac pathology were analyzed. Patients were divided into groups: Group I BMI < 24.9 187 patients, Group II BMI 25-29.9 154 patients, Group III BMI 30-34.9 63 patients, and Group IV 35-39.9 26 patients. A Doppler echocardiogram was performed. The parameters indexed were compared between groups. When allometric growth was verified, the allometric coefficient was calculated. RESULTS: Male sex 242 p (56%), mean age: 44.87 ± 13.10 years, better correlation: LAVOL, LV mass, and AOSD with body surface area (BSA) (LAVOL R: .74, R2 .55, LV mass R: .73, R2 : 0.53, AOSD R: .57, R2 : .35), LVEDD with high (R: .63, R2 : .39) were observed. A significant increase was observed in LAVOL and LVMI in the groups with increased BMI. We observed a decrease in the indexed AOSD and a marginal difference between groups in LVEDD. The allometric correction exponent calculated was as follows: LAVOL: 0.96 and for LVMI: 0.97. CONCLUSIONS: Allometric correction is superior to isometric indexation to assess LAVOL and LVMI in obese and overweight patients. Allometric correction would allow differentiating deviations from VOLAI and IMVI attributable to obesity from those attributable to an associated pathology.

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AIMS: Evaluate the ability of right atrial (RA) strain to predict systolic pulmonary artery pressure (SPAP). METHODS AND RESULTS: A total of 102 patients were prospectively enrolled. Conventional echocardiographic measures were performed. RA volume was calculated. Mean maximum right ventricle (RV) strain and lateral RA strain were obtained. Pearson's correlation test was used. A multivariate analysis was performed to compare SPAP with RA strain, RV strain, and baseline characteristics of the patients. RA strain was compared between patients with SPAP ≤ 37 mm Hg with those with SPAP > 37 mm Hg. A receiver operating characteristic (ROC) curve was constructed. A P < 0.01 value was considered statistically significant. AGE: 58.7 ± 15.7 years. Male: 46 (45.1%). The correlation coefficient between SPAP and RA strain was -0.64 (P < 0.01, 95% confidence interval (CI): -0.75 to -0.50). Quadratic R2 coefficient = 0.52. In the multivariate analysis, RA strain was independently associated with SPAP level. There were significant differences in RA strain between patients with SPAP ≤ 37 mm Hg (63.3 ± 13.3%; 95% CI: 59.4%-65.1%) and >37 mm Hg (32.7 ± 11.1%; 95% CI: 26.5%-38.39%) (P < 0.01). RA strain < 42.5% was capable to predict a SPAP > 37 mm Hg with 93% sensitivity and 94% specificity, area under the curve (AUC) of 98% (95% CI: 94%-100%). CONCLUSIONS: Right atrial strain is independently associated with SPAP level. RA strain lower than 42.5% can predict a SPAP > 37 mm Hg with high sensitivity and specificity.

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Objetivos Evaluar alteraciones precoces del strain auricular longitudinal en base al speckle tracking y el índice de rigidez auricular en hipertensos leves. Material y métodos Ingresaron prospectivamente 101 pacientes de entre 30 y 50 años: 32 sujetos sanos sedentarios (Grupo 1), 35 sanos deportistas (Grupo 2) y 34 hipertensos controlados (Grupo 3). Sexo masculino: 68 (67,3%). Se efectuaron mediciones ecocardiográficas convencionales, se registraron el Doppler tisular color y el Doppler tisular pulsado lateral y septal y se calculó el volumen auricular. Se obtuvieron el strain y el strain rate ventricular sistólico y el strain auricular máximo durante el período de reservorio por speckle tracking. Se calculó el índice de rigidez auricular en base a la relación (E/e)/strain auricular máximo. Se utilizó el análisis de ANOVA seguido de la prueba de Bonferroni, considerándose significativa una p < 0,01. Resultados La relación E/A y la velocidad de la onda e tisular fueron mayores y la relación E/e fue menor en el grupo de deportistas. El índice de masa del ventrículo izquierdo no mostró diferencias significativas. El volumen de la aurícula izquierda fue mayor en deportistas sin alcanzar significación estadística. El strain auricular fue menor en hipertensos (36,94 ± 7,71 vs. 46,17 ± 10,05 en el Grupo 1 y 46,80 ± 8,44 en el Grupo 2; IC 95% 3,96-14,47; p < 0,0001) y el índice de rigidez auricular fue significativamente más alto en este grupo (30,49 ± 11,93 vs. 19,94 ± 8,12 en el Grupo 1 y 18,99 ± 5,88 en Grupo 2; IC 95% 5,05-16,05; p < 0,0001). Conclusiones La deformación auricular longitudinal durante el período de reservorio y el índice de rigidez auricular se hallan alterados en hipertensos leves controlados antes de que se detecten otras alteraciones ecocardiográficas.

Left Atrial Longitudinal Strain: Early Alterations in Young Patients with Mild Hypertension Objectives The aim of this study was to evaluate early changes in left atrial longitudinal strain based on speckle tracking and the atrial stiffness index in patients with mild hypertension. Methods One hundred and one patients, 30 to 50 years of age, were prospectively enrolled in the study: 32 healthy sedentary patients (Group 1), 35 healthy recreational athletes (Group 2) and 34 mild hypertensive patients (Group 3). Sixty eight patients were men (67.3%). Conventional echocardiographic assessments were performed, color tissue Doppler and lateral and septal pulsed tissue Doppler were recorded and atrial volume was calculated. Left ventricular strain and strain rate and left atrial peak strain during the reservoir period were obtained by speckle tracking. The atrial stiffness index was calculated based on the (E/e)/peak atrial strain ratio. Data was analyzed using ANOVA followed by the Bonferroni test. A p value <0.01 was considered statistically significant. Results The E/A ratio and the tissue e wave velocity were higher and the E/e ratio was lower in the athlete group. Left ventricular mass index did not show statistical differences among groups. Left atrial volume was higher in athletes without attaining significant difference. In hypertensive patients, atrial strain was lower (36.94 ± 7.71 vs. 46.17 ± 10.05 in Group 1 and 46.80 ± 8.44 in Group 2; 95% CI 3.96-14.47; p <0.0001) and the stiffness index was higher (30.49 ± 11.93 vs. 19.94 ± 8.12 in Group 1 and 18.99 ± 5.88 in Group 2; 95% CI 5.05-16.05; p <0.0001). Conclusions Left atrial longitudinal strain during the reservoir period and the atrial stiffness index are altered in patients with mild controlled hypertension before the detection of other echocardiographic changes.

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Objetivos Evaluar alteraciones precoces del strain auricular longitudinal en base al speckle tracking y el índice de rigidez auricular en hipertensos leves. Material y métodos Ingresaron prospectivamente 101 pacientes de entre 30 y 50 años: 32 sujetos sanos sedentarios (Grupo 1), 35 sanos deportistas (Grupo 2) y 34 hipertensos controlados (Grupo 3). Sexo masculino: 68 (67,3%). Se efectuaron mediciones ecocardiográficas convencionales, se registraron el Doppler tisular color y el Doppler tisular pulsado lateral y septal y se calculó el volumen auricular. Se obtuvieron el strain y el strain rate ventricular sistólico y el strain auricular máximo durante el período de reservorio por speckle tracking. Se calculó el índice de rigidez auricular en base a la relación (E/e)/strain auricular máximo. Se utilizó el análisis de ANOVA seguido de la prueba de Bonferroni, considerándose significativa una p < 0,01. Resultados La relación E/A y la velocidad de la onda e tisular fueron mayores y la relación E/e fue menor en el grupo de deportistas. El índice de masa del ventrículo izquierdo no mostró diferencias significativas. El volumen de la aurícula izquierda fue mayor en deportistas sin alcanzar significación estadística. El strain auricular fue menor en hipertensos (36,94 ± 7,71 vs. 46,17 ± 10,05 en el Grupo 1 y 46,80 ± 8,44 en el Grupo 2; IC 95% 3,96-14,47; p < 0,0001) y el índice de rigidez auricular fue significativamente más alto en este grupo (30,49 ± 11,93 vs. 19,94 ± 8,12 en el Grupo 1 y 18,99 ± 5,88 en Grupo 2; IC 95% 5,05-16,05; p < 0,0001). Conclusiones La deformación auricular longitudinal durante el período de reservorio y el índice de rigidez auricular se hallan alterados en hipertensos leves controlados antes de que se detecten otras alteraciones ecocardiográficas.(AU)

Left Atrial Longitudinal Strain: Early Alterations in Young Patients with Mild Hypertension Objectives The aim of this study was to evaluate early changes in left atrial longitudinal strain based on speckle tracking and the atrial stiffness index in patients with mild hypertension. Methods One hundred and one patients, 30 to 50 years of age, were prospectively enrolled in the study: 32 healthy sedentary patients (Group 1), 35 healthy recreational athletes (Group 2) and 34 mild hypertensive patients (Group 3). Sixty eight patients were men (67.3%). Conventional echocardiographic assessments were performed, color tissue Doppler and lateral and septal pulsed tissue Doppler were recorded and atrial volume was calculated. Left ventricular strain and strain rate and left atrial peak strain during the reservoir period were obtained by speckle tracking. The atrial stiffness index was calculated based on the (E/e)/peak atrial strain ratio. Data was analyzed using ANOVA followed by the Bonferroni test. A p value <0.01 was considered statistically significant. Results The E/A ratio and the tissue e wave velocity were higher and the E/e ratio was lower in the athlete group. Left ventricular mass index did not show statistical differences among groups. Left atrial volume was higher in athletes without attaining significant difference. In hypertensive patients, atrial strain was lower (36.94 ± 7.71 vs. 46.17 ± 10.05 in Group 1 and 46.80 ± 8.44 in Group 2; 95% CI 3.96-14.47; p <0.0001) and the stiffness index was higher (30.49 ± 11.93 vs. 19.94 ± 8.12 in Group 1 and 18.99 ± 5.88 in Group 2; 95% CI 5.05-16.05; p <0.0001). Conclusions Left atrial longitudinal strain during the reservoir period and the atrial stiffness index are altered in patients with mild controlled hypertension before the detection of other echocardiographic changes.(AU)