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Related Concept Videos

Masking and Demasking Agents01:19

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
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The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
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Depending on the target organ, local anesthetics (LAs) can be administered via various routes. In surface anesthesia, LAs are applied directly to the surface of the skin or mucous membranes. It is widely used for topical skin numbing before venipuncture or minor surgical procedures. Commonly used surface local anesthetics are lidocaine or benzocaine sprays or creams. Surface anesthesia occurs within 5 minutes and lasts for about 60 minutes. One of the main disadvantages of topical anesthesia is...
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Block diagrams serve as a visual representation of the input-output relationships within a system. An illustrative example is a heating system, where the set temperature activates the furnace to warm the room to the desired level. Block diagrams are versatile, modeling linear systems through Laplace transform variables and nonlinear systems using time domain variables.
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Related Experiment Video

Updated: Apr 15, 2026

Testing Tactile Masking between the Forearms
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Total Masquerading Bundle Branch Block.

Piotr Kukla1, Marek Jastrzębski2, Leszek Bryniarski2

  • 1Department of Cardiology and Internal Medicine, Specialistic Hospital, Gorlice, Poland.

Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
|March 31, 2015
PubMed
Summary

This study presents a rare case of total masquerading bundle branch block in an elderly woman. It highlights challenges in electrocardiogram (ECG) interpretation for this condition.

Keywords:
left anterior hemiblockmasquerading bundle branch blockright bundle branch block

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Area of Science:

  • Cardiology
  • Medical Diagnostics

Background:

  • Bundle branch block (BBB) is a cardiac conduction abnormality.
  • Masquerading BBB presents diagnostic challenges on electrocardiograms (ECGs).

Observation:

  • An 82-year-old female patient presented with a total masquerading bundle branch block.
  • The case highlights specific ECG findings associated with this rare presentation.

Findings:

  • The patient's ECG analysis revealed complexities due to the masquerading nature of the bundle branch block.
  • This presentation underscores difficulties in differentiating true BBB from other cardiac conditions on ECG.

Implications:

  • Accurate ECG interpretation is crucial for diagnosing cardiac conditions.
  • This case emphasizes the need for careful analysis and consideration of rare ECG patterns.
  • Improved diagnostic criteria may be needed for masquerading bundle branch block.