ABSTRACT
Abstract Aim: This study compares the reliability of brain CT interpretations performed using a diagnostic workstation and a mobile tablet computer in a telestroke context. Methods: A factorial design with 1,452 interpretations was used. Reliability was evaluated using the Fleiss' kappa coefficient on the agreements of the interpretation results on the lesion classification, presence of imaging contraindications to the intravenous recombinant tissue-type plasminogen activator (t-PA) administration, and on the Alberta Stroke Program Early CT Score (ASPECTS). Results: The intra-observer agreements were as follows: good agreement on the overall lesion classification (κ= 0.63, p<0.001), very good agreement on hemorrhagic lesions (κ= 0.89, p<0.001), and moderate agreements on both without acute lesion classification and acute ischemic lesion classification (κ= 0.59 and κ= 0.58 respectively, p<0.001). There was good intra-observer agreement on the dichotomized-ASPECTS (κ= 0.65, p<0.001). Conclusions: The results of our study allow us to conclude that the reliability of the mobile solution for interpreting brain CT images of patients with acute stroke was assured, which would allow efficient and low-cost telestroke services.
Resumen Objetivo: Este estudio compara la confiabilidad de interpretaciones de TAC de cráneo simple realizadas utilizando una estación de trabajo de diagnóstico y un computador tableta en un contexto de teleACV. Métodos: Se utilizó un diseño factorial con 1,452 interpretaciones. La confiabilidad se evaluó utilizando el coeficiente kappa de Fleiss en las concordancias sobre los resultados de la interpretación en la clasificación de la lesión, la presencia de contraindicaciones en la imagen para la administración intravenosa del activador del plasminógeno tisular (AP-t) y con el Alberta Stroke Programme Early CT Score (ASPECTS). Resultados: Se obtuvieron las siguientes concordancias intraobservadores: buena concordancia en la clasificación general de la lesión (κ= 0.63, p<0.001), muy buena concordancia en lesiones hemorrágicas (κ= 0.89, p< 0.001), y concordancia moderada en ambos sin clasificación de lesión aguda y clasificación de lesión isquémica aguda (κ= 0.59 y κ= 0.58 respectivamente, p<0.001). Hubo una buena concordancia intraobservadores en el ASPECTS dicotomizado (κ= 0.65, p<0.001). Conclusiones: Los resultados de nuestro estudio permiten concluir que la confiabilidad de la solución móvil para la interpretación de imágenes de TAC de cráneo simple de pacientes con accidente cerebrovascular agudo (ACV) estaba garantizada, lo que permitiría servicios de teleACV eficientes y de bajo costo.
Subject(s)
Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Brain/diagnostic imaging , Tomography, X-Ray Computed/methods , Stroke/diagnostic imaging , Cell Phone , Brain/pathology , Observer Variation , Thrombolytic Therapy/methods , Cross-Sectional Studies , Reproducibility of Results , Retrospective Studies , Tissue Plasminogen Activator/administration & dosage , Stroke/drug therapy , Fibrinolytic Agents/administration & dosage , Administration, IntravenousABSTRACT
AIM: This study compares the reliability of brain CT interpretations performed using a diagnostic workstation and a mobile tablet computer in a telestroke context. METHODS: A factorial design with 1,452 interpretations was used. Reliability was evaluated using the Fleiss' kappa coefficient on the agreements of the interpretation results on the lesion classification, presence of imaging contraindications to the intravenous recombinant tissue-type plasminogen activator (t-PA) administration, and on the Alberta Stroke Program Early CT Score (ASPECTS). RESULTS: The intra-observer agreements were as follows: good agreement on the overall lesion classification (κ= 0.63, p<0.001), very good agreement on hemorrhagic lesions (κ= 0.89, p<0.001), and moderate agreements on both without acute lesion classification and acute ischemic lesion classification (κ= 0.59 and κ= 0.58 respectively, p<0.001). There was good intra-observer agreement on the dichotomized-ASPECTS (κ= 0.65, p<0.001). CONCLUSIONS: The results of our study allow us to conclude that the reliability of the mobile solution for interpreting brain CT images of patients with acute stroke was assured, which would allow efficient and low-cost telestroke services.
OBJETIVO: Este estudio compara la confiabilidad de interpretaciones de TAC de cráneo simple realizadas utilizando una estación de trabajo de diagnóstico y un computador tableta en un contexto de teleACV. MÉTODOS: Se utilizó un diseño factorial con 1,452 interpretaciones. La confiabilidad se evaluó utilizando el coeficiente kappa de Fleiss en las concordancias sobre los resultados de la interpretación en la clasificación de la lesión, la presencia de contraindicaciones en la imagen para la administración intravenosa del activador del plasminógeno tisular (AP-t) y con el Alberta Stroke Programme Early CT Score (ASPECTS). RESULTADOS: Se obtuvieron las siguientes concordancias intraobservadores: buena concordancia en la clasificación general de la lesión (κ= 0.63, p<0.001), muy buena concordancia en lesiones hemorrágicas (κ= 0.89, p< 0.001), y concordancia moderada en ambos sin clasificación de lesión aguda y clasificación de lesión isquémica aguda (κ= 0.59 y κ= 0.58 respectivamente, p<0.001). Hubo una buena concordancia intraobservadores en el ASPECTS dicotomizado (κ= 0.65, p<0.001). CONCLUSIONES: Los resultados de nuestro estudio permiten concluir que la confiabilidad de la solución móvil para la interpretación de imágenes de TAC de cráneo simple de pacientes con accidente cerebrovascular agudo (ACV) estaba garantizada, lo que permitiría servicios de teleACV eficientes y de bajo costo.
Subject(s)
Brain/diagnostic imaging , Cell Phone , Stroke/diagnostic imaging , Tomography, X-Ray Computed/methods , Administration, Intravenous , Adult , Aged , Aged, 80 and over , Brain/pathology , Cross-Sectional Studies , Female , Fibrinolytic Agents/administration & dosage , Humans , Male , Middle Aged , Observer Variation , Reproducibility of Results , Retrospective Studies , Stroke/drug therapy , Thrombolytic Therapy/methods , Tissue Plasminogen Activator/administration & dosageABSTRACT
BACKGROUND AND PURPOSE: In primary intracerebral hemorrhage, the presence of contrast extravasation after computed tomographic angiography (CTA), termed the spot sign, predicts hematoma expansion and mortality. Because the biological underpinnings of the spot sign are not fully understood, we investigated whether the rate of contrast extravasation, which may reflect the rate of bleeding, predicts expansion and mortality beyond the simple presence of the spot sign. METHODS: Consecutive intracerebral hemorrhage patients with first-pass CTA followed by a 90-second delayed postcontrast CT (delayed CTA) were included. CTAs were reviewed for spot sign presence by 2 blinded readers. Spot sign volumes on first-pass and delayed CTA and intracerebral hemorrhage volumes were measured using semiautomated software. Extravasation rates were calculated and tested for association with hematoma expansion and mortality using uni- and multivariable logistic regressions. RESULTS: One hundred and sixty-two patients were included, 48 (30%) of whom had ≥1 spot sign. Median spot sign volume was 0.04 mL on first-pass CTA and 0.4 mL on delayed CTA. Median extravasation rate was 0.23 mL/min overall and 0.30 mL/min among expanders versus 0.07 mL/min in nonexpanders. Extravasation rates were also significantly higher in patients who died in hospital: 0.27 mL/min versus 0.04 mL/min. In multivariable analysis, the extravasation rate was independently associated with in-hospital mortality (odds ratio, 1.09 [95% confidence interval, 1.04-1.18], P=0.004), 90-day mortality (odds ratio, 1.15 [95% confidence interval, 1.08-1.27]; P=0.0004), and hematoma expansion (odds ratio, 1.03 [95% confidence interval, 1.01-1.08]; P=0.047). CONCLUSIONS: Contrast extravasation rate, or spot sign growth, further refines the ability to predict hematoma expansion and mortality. Our results support the hypothesis that the spot sign directly measures active bleeding in acute intracerebral hemorrhage.
Subject(s)
Cerebral Angiography/methods , Cerebral Hemorrhage/diagnostic imaging , Cerebral Hemorrhage/mortality , Hematoma/diagnostic imaging , Aged , Aged, 80 and over , Cohort Studies , Disease Progression , Female , Humans , Male , Middle Aged , Prognosis , Single-Blind Method , Tomography, X-Ray ComputedABSTRACT
BACKGROUND AND PURPOSE: The computed tomography angiography (CTA) spot sign is a validated biomarker for poor outcome and hematoma expansion in intracerebral hemorrhage. The spot sign has proven to be a dynamic entity, with multimodal imaging proving to be of additional value. We investigated whether the addition of a 90-second delayed CTA acquisition would capture additional intracerebral hemorrhage patients with the spot sign and increase the sensitivity of the spot sign. METHODS: We prospectively enrolled consecutive intracerebral hemorrhage patients undergoing first pass and 90-second delayed CTA for 18 months at a single academic center. Univariate and multivariate logistic regression were performed to assess clinical and neuroimaging covariates for relationship with hematoma expansion and mortality. RESULTS: Sensitivity of the spot sign for hematoma expansion on first pass CTA was 55%, which increased to 64% if the spot sign was present on either CTA acquisition. In multivariate analysis the spot sign presence was associated with significant hematoma expansion: odds ratio, 17.7 (95% confidence interval, 3.7-84.2; P=0.0004), 8.3 (95% confidence interval, 2.0-33.4; P=0.004), and 12.0 (95% confidence interval, 2.9-50.5; P=0.0008) if present on first pass, delayed, or either CTA acquisition, respectively. Spot sign presence on either acquisitions was also significant for mortality. CONCLUSIONS: We demonstrate improved sensitivity for predicting hematoma expansion and poor outcome by adding a 90-second delayed CTA, which may enhance selection of patients who may benefit from hemostatic therapy.
