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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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Assessing Body Temperature - Temporal Artery01:19

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Here is a stepwise guide to assessing the body temperature at the temporal artery using a temporal artery thermometer
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.  
Step 3: Assess the patient's...
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Related Experiment Video

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Using temperature-time integration as a critical parameter in using monopolar radiofrequency ablations.

Yen-Liang Chang1, Te-Ming Tseng, Po-Yueh Chen

  • 1Department of Otolaryngology Head and Neck Surgery, Cathay General Hospital, Taipei, Taiwan.

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
|February 7, 2014
PubMed
Summary

Radiofrequency ablation (RFA) lesion size is not solely determined by energy delivered. Temperature-time integration, not just energy, is a better indicator for predicting RFA lesion size in tissue ablation.

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Area of Science:

  • Interventional Radiology
  • Medical Physics
  • Biomedical Engineering

Background:

  • Radiofrequency ablation (RFA) is a widely used technique for tissue ablation.
  • Current understanding suggests delivered radiofrequency energy dictates RFA lesion size.
  • This paradigm may not fully capture the complexities of lesion formation.

Purpose of the Study:

  • To re-evaluate the relationship between radiofrequency energy and RFA lesion size.
  • To investigate temperature-time integration as a superior indicator of RFA lesion size.
  • To propose a refined parameter for optimizing RFA procedures.

Main Methods:

  • Utilized an ex vivo lesioning model for RFA procedures.
  • Created fixed 300 J RFA lesions at target temperatures of 65, 75, and 85 °C.
  • Measured lesion sizes and calculated correlations with sustained time (Ts) post-target temperature attainment.

Main Results:

  • RFA lesion size varied significantly across different target temperatures (65, 75, 85 °C) despite identical energy delivery (300 J).
  • Strong correlations were observed between sustained time (Ts) and lesion area/maximal effective radius (Mer) at 75 °C (R=0.913/0.971) and 65 °C (R=0.962/0.923).
  • Lesion size was not directly proportional to total delivered energy.

Conclusions:

  • The total delivered radiofrequency energy is not the sole determinant of RFA lesion size.
  • Temperature-time integration emerges as a more critical and accurate parameter influencing RFA lesion size.
  • This finding suggests a shift in understanding RFA efficacy and optimization strategies.