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相关概念视频

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Mitral Regurgitation III: Medical Management

Mitral regurgitation (MR) is characterized by retrograde blood circulation from the left ventricle into the left atrium due to inadequate mitral valve closure. The severity of the condition, symptoms, and underlying cause determine treatment strategies.Monitoring and Pharmacological TreatmentPatients with mild to moderate MR typically do not need immediate intervention but regular monitoring to assess progression and guide treatment. Patients with mild MR should have an echocardiogram every 3-5...
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Mitral stenosis, a condition marked by the narrowing of the mitral valve, necessitates an integrated approach for effective management. This approach includes preventative measures, medical therapy, and surgical interventions to reduce symptoms and prevent complications.PreventionPrevention of mitral stenosis primarily focuses on reducing the incidence of bacterial infections, particularly streptococcal infections, which can lead to rheumatic fever and subsequent valvular damage. Timely...
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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.
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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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相关实验视频

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The Use of Magnetic Resonance Spectroscopy as a Tool for the Measurement of Bi-hemispheric Transcranial Electric Stimulation Effects on Primary Motor Cortex Metabolism
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微电压T波交替区分可能和不可能受益于植入心脏除器治疗的患者:解决多中心自动除器植入试验 (MADIT) II难题的解决方案.

Daniel M Bloomfield1, Richard C Steinman, Pearila B Namerow

  • 1Data Coordinating Center, The MTWA in CHF Study, PH 9-103D, Department of Medicine, Columbia University, 630 W 168th St, New York, NY 10032, USA. dmb9@columbia.edu.

Circulation
|September 29, 2004
PubMed
概括

微电压T波交替测试优于QRS持续时间,用于识别高或低死亡风险的心力衰竭患者. 这有助于选择适合植入式心脏转换器-除器 (ICD) 的候选人.

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科学领域:

  • 心脏病学 心脏病学
  • 医学诊断 医学诊断 医学诊断
  • 心脏衰竭管理的管理

背景情况:

  • 2003年,美国医疗补助和医疗保险服务中心 (Center for Medicaid and Medicare Services) 建议QRS持续时间用于确定符合植入式心脏除器 (ICD) 资格的患者.
  • 符合MADIT II标准的心力衰竭患者是ICD预防的候选人.
  • 对这些患者风险分层的微伏T波替代和QRS持续时间的比较至关重要.

研究的目的:

  • 为了比较微伏特T波交替剂 (MTWA) 和QRS持续时间在识别符合MADIT II标准的高风险和低风险患者中的有效性.
  • 为了确定哪个标志物更好地预测心力衰竭患者的死亡率,考虑进行ICD治疗.

主要方法:

  • 177名MADIT II型心力衰竭患者的队列接受了微伏T波运动测试和12导电心电图.
  • 患者根据QRS持续时间 (>120毫秒与<=120毫秒) 和MTWA测试结果 (异常与正常) 分类.
  • 作为主要终点,追踪了两年全因死亡率,平均随访时间为20个月.

主要成果:

  • 68%的患者有异常的MTWA测试,而QRS持续时间>120毫秒的患者为32%.
  • 异常的MTWA与两年死亡率的4.8的危险比率相关 (P=0.020),而长时间的QRS的危险比率为1.5 (P=0.367).
  • 正常MTWA的死亡率为3.8%,狭窄QRS为12.0%,假阴性率分别为3.5%和10.2%.

结论:

  • 微电压T波替代体测试在识别高风险心力衰竭患者方面比QRS持续时间更有效.
  • MTWA还擅长识别低风险患者,不太可能从ICD治疗中受益.
  • 这些发现表明,MTWA对于符合MADIT II资格的患者来说是一个优越的风险分层工具.