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相关概念视频

Skeletal Muscle Relaxants: Adverse Effects01:21

Skeletal Muscle Relaxants: Adverse Effects

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Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
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Heart Failure Drugs: β-Blockers01:22

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β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation,...
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The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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相关实验视频

Updated: Jun 16, 2025

Mechanical Control of Relaxation Using Intact Cardiac Trabeculae
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肌肉对抗骨肌肉功能障碍和心力衰竭中的运动不耐受性,使用保存的喷射分数.

Eng Leng Saw1, Louis Dominic Werner1, Hannah L Cooper1

  • 1Department of Medicine, Whitaker Cardiovascular Institute, Boston University Chobanian & Avedisian School of Medicine, MA (E.L.S., L.D.W., H.L.C., D.R.P., M.V.-M., F.S.).

Circulation. Heart failure
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概括

肌肉素的使用改善了骨肌肉功能和心力衰竭中的运动能力,并保留了喷射分数 (HFpEF). 这种myokine增强了氧化能力,为HFpEF相关的运动不耐受提供了潜在的治疗标.

关键词:
运动耐受性 运动耐受性心脏衰竭是因为心脏衰竭.肌肉,骨和骨的组织.肌痛的原因是myokines.这是一种天然尿素.

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科学领域:

  • 心血管研究研究心血管研究
  • 骨肌肉生理学 骨肌肉生理学
  • 代谢性疾病 代谢性疾病

背景情况:

  • 在心力衰竭中,运动不耐受与保存的喷射分数 (HFpEF) 与骨肌肉 (SkM) 功能障碍和氧化能力降低有关.
  • 肌素,如肌肉素,由SkM分泌以维持氧化能力并影响尿素 (NP) 和过氧体增殖器激活的受体-γ联合激活器-1αα (PGC-1α) 信号传递.

研究的目的:

  • 在HFpEF的背景下,研究肌肉在骨肌肉功能障碍中的作用.
  • 评估外源肌肉在改善与HFpEF相关的骨肌肉损伤和运动不耐受性方面的治疗潜力.

主要方法:

  • 使用小鼠模型 (SAUNA) 诱导HFpEF,在干预期内给出异源肌肉素.
  • 对血液和骨肌肉 (小鼠的soleus,HFpEF患者的vastus lateralis) 进行分子分析,以评估信号通路和肌肉纤维特征.

主要成果:

  • HFpEF与肌肉的增加和循环氨酸单酸和PGC-1α水平的降低有关,这表明NP信号受损.
  • 在HFpEF小鼠中,外源性肌的使用增强了NP信号传递,促进了向耐力导向肌肉纤维 (类型-2A到类型-1) 的转变,并改善了氧化能力标志物.
  • 肌肉治疗改善了HFpEF小鼠的功能和运动能力,并减轻了心脏缩,而不会对血压或透气功能产生不良影响.

结论:

  • 肌肉在HFpEF中对骨肌肉和心脏功能产生有益影响,可能是通过增强SkM的氧化能力.
  • 这些发现表明肌肉素是提高HFpEF患者运动能力的潜在治疗剂,需要进一步的临床研究.