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Related Concept Videos

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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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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Aging01:26

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
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Heart Failure II: Pathophysiology01:29

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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Frailty Assessment in an Aging Mouse Model
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Frailty syndrome: an overview.

Xujiao Chen1, Genxiang Mao1, Sean X Leng2

  • 1Department of Geriatrics, Zhejiang Hospital, Hangzhou, People's Republic of China.

Clinical Interventions in Aging
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Frailty is a geriatric syndrome of age-associated decline, increasing health risks. Understanding its causes, like inflammation, aids in better risk assessment and interventions for older adults.

Keywords:
IL-6agingfrailtyinflammationolder adults

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Area of Science:

  • Geriatric Medicine
  • Pathophysiology
  • Public Health

Background:

  • Frailty is a prevalent geriatric syndrome marked by declining physiological reserve and function across multiple organ systems.
  • It increases vulnerability to adverse health outcomes in older adults.
  • Two primary models exist: the frailty phenotype (five criteria) and the frailty index (cumulative deficits).

Purpose of the Study:

  • To review the current understanding of frailty's pathogenesis, clinical applications, and interventions.
  • To highlight the role of chronic inflammation as a key pathophysiologic process.
  • To discuss the utility of frailty assessment in diverse clinical settings and populations.

Main Methods:

  • Literature review of frailty models, pathogenesis, and clinical applications.
  • Synthesis of current research on the role of chronic inflammation and multifactorial etiologies.
  • Examination of frailty's application in risk assessment and intervention strategies.

Main Results:

  • Chronic inflammation is a significant contributor to frailty, impacting various physiological systems.
  • Obesity and specific diseases are also implicated in frailty's complex etiology.
  • Frailty assessment is valuable for risk stratification in community-dwelling elderly, surgical patients, and those with chronic diseases.

Conclusions:

  • Frailty assessment aids in identifying vulnerable older adults and informing clinical decisions.
  • Current interventions include exercise and comprehensive geriatric care.
  • Further research into frailty's biological basis will drive more effective interventions and care models.