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Decreased Body Temperature01:29

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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model
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J waves in accidental hypothermia.

Satoshi Higuchi1, Toshiyuki Takahashi, Yusuke Kabeya

  • 1Departments of Cardiology, Tokyo Saiseikai Central Hospital.

Circulation Journal : Official Journal of the Japanese Circulation Society
|November 9, 2013
PubMed
Summary
This summary is machine-generated.

J waves, an ECG marker, are common in hypothermia, increasing with severity. These J waves (notches/slurs in QRS) did not strongly correlate with dangerous heart rhythms in this study.

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Area of Science:

  • Cardiology
  • Internal Medicine
  • Emergency Medicine

Background:

  • J waves are recognized electrocardiogram (ECG) markers associated with ventricular fibrillation.
  • The prevalence and clinical significance of J waves in hypothermic patients are not well understood.

Purpose of the Study:

  • To investigate the prevalence and amplitude of J waves in patients with accidental hypothermia.
  • To determine the relationship between body temperature and J wave characteristics.
  • To assess the association between J waves and ventricular arrhythmias in hypothermia.

Main Methods:

  • Evaluated clinical data and ECGs of 60 hypothermic patients (<35.0°C).
  • Defined J waves as terminal QRS notching/slurring (≥0.1mV amplitude).
  • Analyzed J wave prevalence, amplitude correlation with body temperature, and occurrence during atrial fibrillation and rewarming.

Main Results:

  • J waves were observed in 50% of hypothermic patients and disappeared upon rewarming.
  • Higher J wave prevalence and amplitude were significantly associated with lower body temperatures (P<0.001).
  • J waves were augmented by short R-R intervals in some atrial fibrillation patients; only one patient developed ventricular tachycardia.

Conclusions:

  • J wave prevalence and amplitude increase with hypothermia severity.
  • The presence and development of J waves in hypothermia may not be directly linked to fatal arrhythmias.