08 - More Objective Measurements Flashcards
What is Electromyography (EMG)?
How is it measured?
What does it tell us?
Place electrodes - intra muscular or surface.
Gives an index of muscle activity.
What muscles are working and when
What are two kinds of Laryngoscopy?
Rigid Laryngoscopy
Flexible Laryngoscopy
What is Rigid Laryngoscopy?
2
Endoscope passed through the patient’s mouth, while the patient’s tongue is held by the examiner.
Images are usually recorded on video.
What is the benefit of Rigid Laryngoscopy?
What is the downside?
Clearest image
It prevents normal speech
What is Flexible Laryngoscopy?
2
Flexible laryngoscopy provides a magnified view of the larynx while the patient produces sound (speaking, singing, etc.).
Viewing is done through a flexible scope
passed through the patient’s nose to the back of the
throat
What is the benefit of Flexible Laryngoscopy?
Viewing the larynx in action.
What is Indirect Laryngoscopy?
Uses a laryngeal mirror
What is a Stroboscopy?
4
Works on the principle of Talbot’s law.
Microphone at neck adjusts strobe frequency to sound frequency
Strobe flashes at slightly lower frequency (1-2 Hz.)
This causes a delay in illumination and gives the illusion of slow motion
What is Talbot’s Law?
Visuals remain in memory for about 2 msec
What should we look for during a Stroboscopy?
6
Symmetry
Structures
Periodicity and Homogeneity
Glottal Closure Patterns
Muscle tension
Movement of the VF and Arytenoids
What is the upper lip of the larynx?
Lower lip?
Anterior - Epiglottis
Posterior - Arytenoids
What is Periodicity?
Similar vibratory cycles
What is Homogeneity?
Similar amplitude cycles
What are the two types of Glottal Closure Patterns?
Width / Length
Horizontal / Vertical
What is ventricular dysphonia?
Ventricular / False vocal folds use during phonation
