Videostroboscopy

Question 1

normal phase : ___ :: locked phase : ___

Answer 1

each light flash illuminates a different point of the vibratory cycle; each light flash illuminates the same point across vibratory cycles

Question 2

normal phase

Answer 2

light captures different parts of the vibratory cycle which is then combined into one picture; the patient’s Fo determines where in the cycle to flash light (depends on periodicity of glottal cycle)

Question 3

locked phase

Answer 3

assesses periodicity; light captures the same point across vibratory cycles; IF the vibration is periodic, THEN the VFs will appear to stand still

Question 4

you get a normal phase video strobe where the VFs appear to be moving. the VF vibration is ___

Answer 4

aperiodic

Question 5

the degree of regularity of VF vibration is _____

Answer 5

periodicity (use locked phase for video strobe)

Question 6

the extent of horizontal excursion of each VF during vibration at comfortable / normal pitch is _____

Answer 6

amplitude of vibration (should be symmetrical)

Question 7

the rate extent of horizontal excursion of the wave is ______.

Answer 7

mucosal wave (should be symmetrical)

Question 8

determined by whether or not the VFs meet at the midline to close or move away from the midline to open?

Answer 8

phase symmetry

Question 9

determined by which phase (opened or closed) predominates the vibratory cycle?

Answer 9

phase closure

Question 10

characterized by any (if any) impaired movement of the VFs during abduction and adduction?

Answer 10

vocal fold mobility (signs of weakness, paralysis)

Question 11

determined by lack of mucosal wave and / or decreased amplitude of vibration?

Answer 11

stiffness