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Related Concept Videos

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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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.
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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.
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ECG Interpretation of Rhythms01:24

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An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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Related Experiment Video

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Recording and Analysis of Circadian Rhythms in Running-wheel Activity in Rodents
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[Circadian rhythms - how do they influence our lives?]

Lisbeth Harder1, Henrik Oster1

  • 1Institut für Neurobiologie, Universität zu Lübeck, Deutschland.

Deutsche Medizinische Wochenschrift (1946)
|July 28, 2019
PubMed
Summary

Modern life disrupts natural body rhythms, leading to internal desynchronization that increases disease risk. Stabilizing circadian systems through interventions offers novel therapeutic targets for metabolic and immune health.

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Area of Science:

  • Chronobiology
  • Metabolic Health
  • Immunology

Background:

  • Modern lifestyles disrupt natural daily rhythms, causing internal desynchronization.
  • This desynchronization is linked to metabolic disorders like obesity and type-2 diabetes.
  • Chronodisruption also impairs immune defense, while circadian stability enhances pathogen resilience.

Purpose of the Study:

  • To explore the link between circadian rhythm disruption and metabolic and immune health.
  • To highlight the translational potential of chronobiology in disease prevention and therapy.

Main Methods:

  • Review of chronobiology research focusing on circadian rhythms.
  • Analysis of the impact of chronodisruption on physiological processes.
  • Examination of therapeutic strategies including chronotherapy and behavioral interventions.

Main Results:

  • Internal desynchronization due to chronodisruption promotes metabolic diseases.
  • Chronodisruption combined with insomnia weakens immune function.
  • Circadian system stabilization can improve resilience to pathogens.

Conclusions:

  • Chronobiology is a translational discipline with significant therapeutic implications.
  • Stabilizing circadian rhythms offers novel targets for preventing and treating widespread diseases.
  • Chronotherapy and behavioral interventions are key strategies in chronomedicine.