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相关概念视频

Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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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使用光学实验创建干细胞衍生的心肌细胞的细胞特异性计算模型.

Janice Yang1, Neil J Daily2, Taylor K Pullinger1

  • 1Department of Pharmacological Sciences & Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, United States of America.

PLoS computational biology
|September 11, 2024
PubMed
概括

研究人员开发了一个计算管道,以校准人类诱导的多能干细胞衍生心肌细胞 (iPSC-CM) 电生理学. 这种方法提高了对iPSC-CM可变性和离子通道特性的理解,以更好地建模心脏病.

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科学领域:

  • 心脏病学 心脏病学
  • 计算生物学 计算生物学
  • 干细胞研究 干细胞研究

背景情况:

  • 人类诱导的多能干细胞衍生心肌细胞 (iPSC-CMs) 对心脏研究有价值,但表现出不成熟的电生理学和实验室特异性变异性.
  • 现有的数学模型往往无法捕捉到iPSC-CM表型异质性的全部范围.
  • iPSC 捐赠者的遗传背景进一步导致细胞反应的变异性.

研究的目的:

  • 开发一条计算管道,用于在iPSC-CM中校准细胞制备特定的电生理学参数.
  • 解决现有iPSC-CM模型关于表型变异性和成熟差异的局限性.
  • 优化实验协议,以生成足够的数据来准确的参数校准.

主要方法:

  • 利用遗传算法 (GA) 在iPSC-CM生理学的数学模型中调整离子通道参数.
  • 通过模拟各种实验协议在具有已知的导电量变异的模型群体上生成in silico数据集.
  • 校准模型参数使用电压和短暂数据在各种条件下,包括电动节奏,离子通道阻塞和缓冲离子度变化.

主要成果:

  • 在各种实验条件下对电压和过渡数据进行校准,显著改善了模型参数估计.
  • 在校准后,未见的通道阻断响应的模型预测得到了增强.
  • 规范化光记录,一种高通量方法,足够了解导电性参数,类似于补丁记录.

结论:

  • 开发的计算管道可以确定iPSC-CMs中的细胞系特定的离子通道特性.
  • 这种方法有助于理解iPSC-CM扰动反应的变化背后的机制.
  • 该管道提供了一种方法来提高iPSC-CM模型在心脏研究中的准确性和适用性.