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Related Concept Videos

Drug Toxicity: Risk factors01:24

Drug Toxicity: Risk factors

Adverse Drug Reactions (ADRs) are potential complications that arise during pharmacotherapy, influenced by multiple risk factors. Age plays a significant role; both neonates and the elderly are at heightened risk due to their respective immature and diminished metabolic and elimination processes. Gender also impacts ADRs, with females experiencing a 1.5 to 1.7-fold greater risk than males, which may be linked to pharmacokinetic, pharmacodynamic, and hormonal differences. Notably, neonates, the...
Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

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...
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
The Periodic Table and Organismal Elements01:27

The Periodic Table and Organismal Elements

Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...
Combined Effects of Drugs: Antagonism01:30

Combined Effects of Drugs: Antagonism

The combined effects of drugs can result in various interactions, of which an important type is antagonism. Antagonism is a mechanism where one drug inhibits or counteracts the effects of another drug. Antagonism can occur through various means, including receptor binding, allosteric modulation, functional interaction, chemical reactions, and pharmacokinetic processes.
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Related Experiment Video

Updated: Jun 2, 2026

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Published on: April 5, 2011

CIRCAMULTISEPTAN ASPECT OF SUDDEN DEATH: COMPETING SOCIO-ECOLOGICAL SYNCHRONIZERS: ALCOHOL AND MAGNETICS?

S Murakami1, G Cornélissen, G Katinas

  • 1Tokyo Women's Medical University, Daini Hospital, Tokyo, Japan.

Scripta Medica
|May 6, 2011
PubMed
Summary
This summary is machine-generated.

Sudden death incidence shows about-weekly and two-weekly patterns, distinct from other cardiovascular events. Lifestyle changes, possibly linked to salary schedules, may influence sudden death occurrence, peaking on Saturdays.

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Last Updated: Jun 2, 2026

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
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Published on: April 5, 2011

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Area of Science:

  • Chronobiology
  • Epidemiology
  • Cardiovascular Research

Background:

  • Sudden death exhibits complex temporal patterns.
  • Understanding infradian rhythms is crucial for predicting and preventing sudden cardiac events.
  • Previous studies have not fully explored multiseptan variations in sudden death incidence.

Purpose of the Study:

  • To investigate infradian (less than weekly) rhythms in the daily incidence of sudden death.
  • To identify periodic components in sudden death occurrences and compare them with other cardiovascular conditions.
  • To explore potential triggers, including lifestyle and environmental factors, influencing sudden death patterns.

Main Methods:

  • Re-analysis of 70,531 ambulance call records for sudden death cases in Moscow (1979-1981).
  • Application of least squares spectral analysis to identify periodic variations (multiseptans).
  • Validation of identified periodicities using nonlinear least squares and comparison with geomagnetic activity indices.

Main Results:

  • Prominent yearly and half-yearly variations were observed in sudden death incidence.
  • Significant about-weekly (approx. 7 days) and two-weekly (approx. 15.2 days) components were detected.
  • The 15.2-day variation differed from geomagnetic activity, suggesting lifestyle influences like alcohol consumption tied to salary cycles.
  • Sudden death incidence peaked on Saturdays, unlike other cardiovascular conditions peaking on Mondays.

Conclusions:

  • Sudden death displays unique infradian rhythms, including about-weekly and two-weekly cycles, potentially influenced by lifestyle factors.
  • The distinct weekly pattern of sudden death, peaking on Saturdays, differentiates it from other cardiovascular events.
  • Further research using modern devices like cardioverter-defibrillators can elucidate lethal arrhythmia triggers and inform preventative strategies.