Exploring the use of ChatGPT in predicting anterior circulation stroke functional outcomes after mechanical thrombectomy: a pilot study.

BACKGROUND: Accurate prediction of functional outcomes is crucial in stroke management, but this remains challenging. OBJECTIVE: To evaluate the performance of the generative language model ChatGPT in predicting the functional outcome of patients with acute ischemic stroke (AIS) 3 months after mechanical thrombectomy (MT) in order to assess whether ChatGPT can used to be accurately predict the modified Rankin Scale (mRS) score at 3 months post-thrombectomy. METHODS: We conducted a retrospective analysis of clinical, neuroimaging, and procedure-related data from 163 patients with AIS undergoing MT. The agreement between ChatGPT's exact and dichotomized predictions and actual mRS scores was assessed using Cohen's κ. The added value of ChatGPT was measured by evaluating the agreement of predicted dichotomized outcomes using an existing validated score, the MT-DRAGON. RESULTS: ChatGPT demonstrated fair (κ=0.354, 95% CI 0.260 to 0.448) and good (κ=0.727, 95% CI 0.620 to 0.833) agreement with the true exact and dichotomized mRS scores at 3 months, respectively, outperforming MT-DRAGON in overall and subgroup predictions. ChatGPT agreement was higher for patients with shorter last-time-seen-well-to-door delay, distal occlusions, and better modified Thrombolysis in Cerebral Infarction scores. CONCLUSIONS: ChatGPT adequately predicted short-term functional outcomes in post-thrombectomy patients with AIS and was better than the existing risk score. Integrating AI models into clinical practice holds promise for patient care, yet refining these models is crucial for enhanced accuracy in stroke management.

Nationwide Access to Endovascular Treatment for Acute Ischemic Stroke in Portugal.

INTRODUCTION: Since the publication of endovascular treatment trials and European Stroke Guidelines, Portugal has re-organized stroke healthcare. The nine centers performing endovascular treatment are not equally distributed within the country, which may lead to differential access to endovascular treatment. Our main aim was to perform a descriptive analysis of the main treatment metrics regarding endovascular treatment in mainland Portugal and its administrative districts. MATERIAL AND METHODS: A retrospective national multicentric cohort study was conducted, including all ischemic stroke patients treated with endovascular treatment in mainland Portugal over two years (July 2015 to June 2017). All endovascular treatment centers contributed to an anonymized database. Demographic, stroke-related and procedure-related variables were collected. Crude endovascular treatment rates were calculated per 100 000 inhabitants for mainland Portugal, and each district and endovascular treatment standardized ratios (indirect age-sex standardization) were also calculated. Patient time metrics were computed as the median time between stroke onset, first-door, and puncture. RESULTS: A total of 1625 endovascular treatment procedures were registered. The endovascular treatment rate was 8.27/100 000 inhabitants/year. We found regional heterogeneity in endovascular treatment rates (1.58 to 16.53/100 000/year), with higher rates in districts closer to endovascular treatment centers. When analyzed by district, the median time from stroke onset to puncture ranged from 212 to 432 minutes, reflecting regional heterogeneity. DISCUSSION: Overall endovascular treatment rates and procedural times in Portugal are comparable to other international registries. We found geographic heterogeneity, with lower endovascular treatment rates and longer onset-to-puncture time in southern and inner regions. CONCLUSION: The overall national rate of EVT in the first two years after the organization of EVT-capable centers is one of the highest among European countries, however, significant regional disparities were documented. Moreover, stroke-onset-to-first-door times and in-hospital procedural times in the EVT centers were comparable to those reported in the randomized controlled trials performed in high-volume tertiary hospitals.

Introdução: A aprovação do tratamento endovascular para o acidente vascular cerebral isquémico obrigou à reorganização dos cuidados de saúde em Portugal. Os nove centros que realizam tratamento endovascular não estão distribuídos equitativamente pelo território, o que poderá causar acesso diferencial a tratamento. O principal objetivo deste estudo é realizar uma análise descritiva da frequência e métricas temporais do tratamento endovascular em Portugal continental e seus distritos. Material e Métodos: Estudo de coorte nacional multicêntrico, incluindo todos os doentes com acidente vascular cerebral isquémico submetidos a tratamento endovascular em Portugal continental durante um período de dois anos (julho 2015 a junho 2017). Foram colhidos dados demográficos, relacionados com o acidente vascular cerebral e variáveis do procedimento. Taxas de tratamento endovascular brutas e ajustadas (ajuste indireto a idade e sexo) foram calculadas por 100 000 habitantes/ano para Portugal continental e cada distrito. Métricas de procedimento como tempo entre instalação, primeira porta e punção foram também analisadas. Resultados: Foram registados 1625 tratamentos endovasculares, indicando uma taxa bruta nacional de tratamento endovascular de 8,27/100 000 habitantes/ano. As taxas de tratamento endovascular entre distritos variaram entre 1,58 e 16,53/100 000/ano, com taxas mais elevadas nos distritos próximos a hospitais com tratamento endovascular. O tempo entre sintomas e punção femural entre distritos variou entre 212 e 432 minutos. Discussão: A análise nacional a taxas de tratamento endovascular e tempos de atuação é comparável a outros registos internacionais. Verificaram-se heterogeneidades geográficas, com taxas de tratamento endovascular menores e maior tempo para tratamento nos distritos do sul e interior. Conclusão: Portugal continental apresenta uma taxa nacional de tratamento endovascular elevada, apresentando, contudo, assimetrias regionais no acesso. As métricas temporais foram comparáveis com as observadas nos ensaios clínicos piloto.

Neutrophil-to-Lymphocyte Ratio Predicts Cerebral Edema and Clinical Worsening Early After Reperfusion Therapy in Stroke.

BACKGROUND AND PURPOSE: The mechanisms linking systemic inflammation to poor outcome in ischemic stroke are not fully understood. The authors investigated if peripheral inflammation following reperfusion therapy leads to an increase in cerebral edema (CED), thus hindering the clinical recovery. METHODS: We designed a single-center study conducted at Centro Hospitalar Universitário São João between 2017 and 2019. Inclusion criteria were being adult, having an anterior circulation acute ischemic stroke, and receiving reperfusion therapy. Neutrophil-to-lymphocyte, platelet-to-lymphocyte ratios, and the systemic inflammatory response syndrome criteria were determined. The presence and grade of CED were evaluated on the computed tomography performed 24 hours following event. The clinical outcomes included early neurological deterioration and functional dependence at 90 days. Adjusted odds ratio and 95% CI were obtained by ordinal and logistic regression models. Optimal cutoff values were defined using receiver operating characteristic analysis in the training cohort and validated in an independent data set. RESULTS: Five hundred fifty-three patients were included. Neutrophil-to-lymphocyte increased with higher degrees of CED at 24 hours (adjusted odds ratio, 1.34 [1.09-1.68], P<0.01) and was associated with early neurological deterioration (adjusted odds ratio, 1.30 [1.04-1.63], P<0.05) and poor functional status at 90 days (adjusted odds ratio, 1.79 [1.28-2.48], P<0.01). Platelet-to-lymphocyte was not associated with the outcomes. Systemic inflammatory response syndrome was related to CED due to altered white blood cell counts. Neutrophil-to-lymphocyte was the best predictor with an area under the curve around 0.7. Neutrophil-to-lymphocyte ≥7 had and accuracy, sensitivity, and specificity around 60%. CONCLUSIONS: Increased systemic inflammation is linked to the severity of CED early after reperfusion therapy in stroke. Easily obtained inflammatory markers convey early warning alerts for patients at risk of severe neurological complications with an impact on long-term functional outcome. CED quantification should be included as an end point in proof-of-concept trials in immunomodulation in stroke.

Prognostic yield of imaging before and after recanalization treatments in ischemic stroke.

OBJECTIVES: The scores to predict outcome in ischemic stroke were validated prior to the approval of modern revascularization treatments. We evaluated the accuracy of pre and post-treatment models in a recent recanalization therapy cohort and whether radiological and ultrasound findings could improve their accuracy. MATERIAL & METHODS: We included 375 anterior circulation ischemic stroke patients treated with intravenous thrombolysis or thrombectomy during 2017 and 2018. We collected demographic, clinical, and imaging data. We built pre and post-treatment logistic regression models to predict independence (modified Rankin Scale 0-2) at 3 months. The models included the Alberta Stroke Program Early CT Score (ASPECTS), infarct volume (ABC/2 method), and the Thrombolysis in Brain Ischemia (TIBI) ultrasonographic grade of recanalization. We compared areas under the receiver operating characteristic curve (AUC). RESULTS: Our preintervention model, combining neurological deficit severity, age, and admission glycemia, was not improved by the inclusion of ASPECTS (AUC 0.80 vs 0.79, P = .28). Early neurological recovery at 24-hour significantly increased prognostic performance (AUC = 0.85, P < .01), which did not change by adding final infarct volume or the persistence of arterial occlusion of the affected territory (AUC = 0.86 and 0.85, P > .05). CONCLUSIONS: Models that combine simple variables such as neurological deficit severity, age, and admission glycemia were the most useful for predicting functional outcome in ischemic stroke patients submitted to revascularization treatments. Pre and post-treatment imaging findings did not enhance prognostic accuracy when compared to the patient's clinical improvement.

Cerebral vasoconstriction after carotid endarterectomy.

Carotid endarterectomy carries the risk of several complications. We report a 55-year-old woman with recurrent cerebral vasoconstriction postoperatively. She had bilateral high-grade internal carotid artery stenosis and underwent right endarterectomy because of transient left-sided sensory symptoms. She developed a reperfusion syndrome with severe right-sided headache, right frontotemporal oedema and increased velocities in transcranial Doppler ultrasound. Given her gradual increase of velocities and Lindegaard index, together with fixed left sensory and motor deficits, we performed CT angiography, which suggested cerebral vasoconstriction syndrome. A subsequent left carotid endarterectomy triggered a similar cerebrovascular response. We highlight the need for continuous monitoring of cerebral haemodynamics following carotid endarterectomy.

Stroke secondary to aortic dissection treated with a thrombolytic: a successful case.

Aortic dissection is a life-threatening emergency and can present neurological symptoms, mainly associated with a stroke. This represents a challenge to the neurologist because of the necessity to treat the patient with a thrombolytic in a narrow time window, which could have a fatal outcome. A 70-year-old male patient presented in emergency department with an acute stroke (right middle cerebral artery syndrome) without any other symptoms. He was considered eligible for thrombolytic treatment with recombinant tissue plasminogen activator (rt-PA). During the thrombolysis, asymptomatic hypotension was detected which was corrected with volume and dopamine, without significant worsening of the neurologic deficits. A few minutes after the end of the perfusion, the patient complained about an unspecific dorsal discomfort. It was diagnosed a Stanford type A aortic dissection. The patient was submitted to an urgent surgery to replace the aorta. The evolution was good and 12 months later, he is independent in the activities of daily life. This case of an ischaemic stroke caused by an initial asymptomatic aortic dissection treated with rt-PA could have had a bad outcome, as in the majority of similar cases. However, the rapid diagnosis and appropriate treatment of the dissection could have been the main factors to explain the survival of our patient.

Adenocarcinoma of the cecum as the first manifestation of ulcerative colitis complicated by primary sclerosing cholangitis and endomyocardial fibrosis.

A 47-year-old male Caucasian patient, with no previous relevant medical history, presented in September 1996 with persistent right lower quadrant abdominal pain. A tumor in the cecum was identified and the patient was submitted to ileocecal resection with ileocolic anastomosis. Histological examination showed a moderately differentiated adenocarcinoma. One year later he developed bloody diarrhea, urgency, and loss of weight. Based on clinical presentation and histology of large bowel biopsies, a diagnosis of ulcerative colitis (UC) was established. The previously resected surgical specimen was reevaluated, and lesions resembling UC were identified in the nonneoplastic mucosa. High levels of alkaline phosphatase and gamma-glutamyl transferase were detected. These alterations could be traced back to 1991. Endoscopic retrograde cholangiopancreatography was performed, showing diagnostic features of primary sclerosing cholangitis (PSC), and the patient was put on ursodeoxycholic acid therapy. In March 1999, he started to have progressive dyspnea and signs of cardiac failure. Endomyocardial biopsy was performed showing extensive lesions of endomyocardial fibrosis. This case illustrates a rather silent course of UC in the presence of PSC, and supports the postulated increased risk in the development of proximally located colorectal carcinoma in these patients. Additionally, the development of endomyocardial fibrosis constituted an unexpected finding, not previously reported in this setting.