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Related Concept Videos

Design Example: Frog Muscle Response01:14

Design Example: Frog Muscle Response

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A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...
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Introduction to the Sign Test01:10

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The sign test is an important tool in nonparametric statistics, offering a straightforward yet effective method for analyzing matched pairs, nominal data, or hypotheses concerning the median of a population. It transforms data points into positive or negative signs, avoiding the need for assumptions about data distribution and instead focusing on the direction of change. It is particularly valuable when data does not conform to the normal distribution requirements of many parametric tests. For...
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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Related Experiment Video

Updated: Aug 15, 2025

Author Spotlight: Refining Xenopus laevis Marking Techniques for Biomedical Studies
04:18

Author Spotlight: Refining Xenopus laevis Marking Techniques for Biomedical Studies

Published on: June 28, 2024

788

The Frog Sign Revisited.

Christopher J Ho1, Reginald T Ho2

  • 1Department of Biology, James Madison University, Harrisonburg, VA, USA.

The Journal of Innovations in Cardiac Rhythm Management
|January 6, 2023
PubMed
Summary
This summary is machine-generated.

The frog sign, a physical exam finding, can indicate typical atrioventricular nodal re-entrant tachycardia. This case highlights its observation in a patient with recurrent supraventricular tachycardia undergoing ablation.

Keywords:
Frog signright atrial pressuretypical atrioventricular nodal re-entrant tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Internal Medicine

Background:

  • Supraventricular tachycardia (SVT) is a common arrhythmia.
  • Atrioventricular nodal re-entrant tachycardia (AVNRT) is a frequent cause of SVT.
  • Physical examination maneuvers are crucial for diagnosing cardiac arrhythmias.

Observation:

  • The "frog sign" is a distinctive physical examination finding.
  • This sign is classically associated with typical AVNRT.
  • Its presence can aid in the diagnosis of specific tachycardia types.

Findings:

  • A 78-year-old male presented with symptomatic, recurrent SVT.
  • The frog sign was observed during his physical examination.
  • This finding was noted in the context of referral for ablation therapy.

Implications:

  • Recognizing the frog sign can expedite the diagnosis of AVNRT.
  • It underscores the continued importance of physical examination in the digital age.
  • This case reinforces the frog sign's utility in guiding electrophysiology interventions.