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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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Drug Toxicity: Risk factors01:24

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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...
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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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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...
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Risk factors for QTc interval prolongation.

Charlotte P M Heemskerk1,2, Marieke Pereboom1, Karlijn van Stralen3

  • 1Pharmacy Foundation of Haarlem Hospitals, Boerhaavelaan 24, 2035 RC, Haarlem, The Netherlands.

European Journal of Clinical Pharmacology
|November 24, 2017
PubMed
Summary

This study quantified risk factors for QTc interval prolongation, a precursor to dangerous arrhythmias. Multiple QT-prolonging drugs, female sex, and electrolyte imbalances significantly increase QTc interval length.

Keywords:
Drug-related side effects and adverse reactionsElectrocardiographyHospital information systemsLong QT syndrome/chemically inducedRisk assessment

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Area of Science:

  • Cardiology
  • Clinical Pharmacology
  • Medical Informatics

Background:

  • Prolongation of the QTc interval is associated with Torsade de Pointes, a potentially fatal ventricular arrhythmia.
  • Numerous risk factors, including specific medications and patient demographics, contribute to QTc interval prolongation.
  • Clinical management of QTc prolongation risks remains a subject of debate.

Purpose of the Study:

  • To quantify the impact of various risk factors on the duration of the QTc interval.
  • To provide data-driven insights for managing patients at risk of QTc prolongation.

Main Methods:

  • Analysis of 133,359 ECGs from 40,037 patients recorded between January 2013 and October 2016.
  • Multilevel linear regression analysis was employed to identify independent risk factors for QTc prolongation.
  • Inclusion of laboratory values and prescribed medications to assess their correlation with QTc interval length.

Main Results:

  • Each additional QT-prolonging drug increased the QTc interval; two drugs showed a smaller increase than one drug.
  • Women exhibited significantly longer QTc intervals compared to men, with this difference decreasing with age.
  • Hypokalemia, hypocalcemia, and loop diuretic use were identified as independent risk factors prolonging the QTc interval by at least 10 ms.

Conclusions:

  • This study successfully identified and quantified key risk factors contributing to QTc interval prolongation.
  • Findings highlight the cumulative effect of QT-prolonging drugs and the influence of patient-specific factors.
  • Quantification of these risks aids in refining clinical strategies for preventing adverse cardiac events.