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相关概念视频

Skeleton and Calcium Homeostasis01:21

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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when...
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A z score (or standardized value) is measured in units of the standard deviation. It indicates how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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Updated: Jul 1, 2025

Author Spotlight: Advancing Cardiovascular Imaging - Introducing the Spatially Weighted Calcium Score for Early Disease Detection
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零分数悖论 零分数悖论

Rachad Ghazal1, Danish Bawa1, Adnan Ahmed1

  • 1Kansas City Heart Rhythm Institute and Research Foundation, Overland Park, Kansas, USA.

JACC. Case reports
|March 11, 2024
PubMed
概括
此摘要是机器生成的。

一个零分数并不排除严重的冠状动脉疾病在这个心脏病患者. 非化斑块可能会导致显著的狭窄,限制冠状动脉分数.

关键词:
CTA冠状动脉动脉图 (CTA) 是一种冠状动脉动脉图.动脉斑块是一种动脉斑块.冠状动脉分数冠状动脉分数冠状动脉疾病是一种冠状动脉疾病.冠状动脉样硬化 - 冠状动脉样硬化冠状动脉化的结石化

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科学领域:

  • 心脏病学 心脏病学
  • 医疗成像医学成像

背景情况:

  • 冠状动脉疾病 (CAD) 是导致死亡的主要原因.
  • 冠状动脉评分 (CCS) 是用于评估心血管风险的广泛使用的工具.
  • 非化斑块是动脉样硬化的重要,但往往被低估的组成部分.

研究的目的:

  • 为了呈现一种严重冠状动脉狭窄的胸痛病例,尽管分数为零.
  • 突出症状患者冠状动脉评分的局限性.
  • 为了强调非化斑块的预后重要性.

主要方法:

  • 一个病人的病例报告显示患有胸痛.
  • 冠状动脉计算机断层扫描血管学 (CCTA) 评估冠状动脉解剖学和斑块负担.
  • 冠状动脉分数的评估与斑块的表征相结合.

主要成果:

  • 患者表现出严重的冠状动脉狭窄.
  • 冠状动脉分数为零,表明没有化斑块.
  • 非化斑块被确定为显著狭窄的原因.

结论:

  • 一个0冠状动脉分数并不排除严重的冠状动脉疾病.
  • 非化斑块可能导致显著的冠状动脉狭窄和症状.
  • 冠状动脉评分不应作为症状个体的唯一预测工具.