静脉节律失常早期心脏病发作后的基质的演变:来自猪缺血-再输血模型的见解
Ashwin Bhaskaran1, Tejas Deshmukh2, Richard Bennett3
1Department of Cardiology, Westmead Hospital, Sydney, New South Wales, Australia; Westmead Applied Research Centre, University of Sydney, New South Wales, Australia.
JACC. Clinical electrophysiology
|August 2, 2024
概括
心肌痕通道在心脏病发作后演变,显示复杂性降低,但新的形成. 这些边界区域通道,通过晚期加多增强心磁共振 (LGE-CMR) 识别,传导速度缓慢,并增加腹腔动心风险.
科学领域:
- 心血管成像 - 心血管成像
- 心脏电生理学 心脏电生理学
- 心肌梗塞研究研究
背景情况:
- 心肌梗塞后心肌痕的长期演变及其在引起心律失常方面的作用仍然不清楚.
- 了解痕演变对于预测和预防心脏病发作后心律失常至关重要.
研究的目的:
- 在动物模型中使用晚期加多增强心磁共振 (LGE-CMR) 调查心肌痕和边界区域 (BZ) 通道的演变.
- 为了将LGE-CMR发现与侵入性电解剖学绘图 (EAM) 相关联,以评估心律失常的潜力.
主要方法:
- 创建了缺血-再输液损伤的猪模型.
- 晚期加多增强心磁共振 (LGE-CMR) 在心脏病发作后的多个时间点进行.
- 进行了侵入性电解剖学绘图 (EAM),并分析了LGE-CMR数据以查找痕和通道特征.
主要成果:
- 随着时间的推移,痕质量和边界区域 (BZ) 痕减少,但BZ通道显示出不断变化的复杂性.
- 在心脏病发作后2个月形成的新BZ通道,其中一些是心肌中部,在EAM上表现出显著的导电减速.
- 通过LGE-CMR识别的通道与EAM期间最大电位下降的区域相关,可诱导心室动脉冲动 (VT) 与更复杂的通道有关.
结论:
- 边界区域 (BZ) 道在心脏病发作后的早期出现,表现出功能导电减缓和节律失常的潜力.
- 虽然一些通道回归,但新的,可能是心肌中枢通道稍后形成,为心室动脉障碍 (VT) 形成一个不断发展的基质.
- LGE-CMR可以识别心律失常的BZ通道,有助于在心脏病发作后突然心脏死亡的风险分层.
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