ABSTRACT
Atrial Fibrillation(AF) and its complications are serious threat to human health and the radio frequency ablation (RFA) becomes one of the main therapies of AF. Conventionally, the RFA is performed by unipolar ablation mode. Because the unipolar ablation mode is point-to-point and incomplete linear lesion formation, the success rates of treatment on AF decline and the procedures are time consuming. In order to solve these shortcomings, the bipolar ablation mode and the multichannel frequency ablation method that facilitate the easy creation of linear lesion are presented, especially kinds of multichannel frequency ablation technique and applications are introduced in this paper.
ABSTRACT
Objective Our study focused on acute lacunar infarct shapes to explore the risk factors and clinical significance of irregularly shaped lacunar infarctions. Methods Based on the shape of their acute lacunar infarct, patients (n=204) were classified into the “regular” group or “irregular” group. The characteristics of the lacunar infarction were compared between the regular and irregular groups, between patients with and without neurological deterioration, and between patients with different modified Rankin scale (mRS) scores. The risk factors for irregularly shaped lacunar infarctions, neurological deterioration, and high mRS scores were identified. Results Blood pressure variability (BPV) was an independent risk factor for irregularly shaped lacunar infarction. Infarction size, prevalence of advanced leukoaraiosis, and irregularly shaped lacunar infarcts were independent risk factors for higher mRS scores. Conclusions The irregularly shaped lacunar infarcts were correlated with BPV. Irregularly shaped lacunar infarctions and leukoaraiosis may be associated with unfavorable clinical outcomes. .
Objetivo Estudar as diferentes formas dos infartos lacunares agudos, investigando os fatores de risco e o significado clinico daqueles com morfologia irregular. Métodos Os 204 pacientes com infartos lacunares agudos foram classificados em dois grupos: aqueles com morfologia regular e aqueles com morfologia irregular. Foram estudadas as características dos dois grupos e caracterizados os fatores de risco para infartos irregulares, deterioração neurológica e altos escores da escala de Rankin modificada. Resultados Variabilidade da pressão arterial é fator de risco independente para infartos lacunares irregulares. Tamanho do infarto, prevalência de leucoaraiose e formato irregular dos infartos lacunares são fatores de risco independentes para escores mais elevados na escala de Rankin modificada. Conclusões Variabilidade da pressão arterial está relacionada ao formato irregular dos infartos lacunares agudos. Este tipo de infarto e a leucoaraiose podem estar relacionado a desfechos clínicos desfavoráveis. .