4.1: Voice Assessment Part 1

Question 1

S/Z Ratio

Answer 1

-Estimate of laryngeal efficiency: respiratory vs. phonation

-Length of time a person can sustain /s/ and /z/ sounds
*Ratio: 𝑠 𝑡𝑖𝑚𝑒/𝑧 𝑡𝑖𝑚𝑒

Question 2

S/Z Ratio Normative Range

Answer 2

1=Normal Vocal Fold functioning
≥ 1.2 Glottal Valving inefficiency (children)
≥ 1.4 Glottal Valving inefficiency (adults)

Question 3

Maximum Phonation Time (MPT)

Answer 3

-Estimate of laryngeal and respiratory function
-Length of time a person can sustain /a/ sound

Question 4

Respiratory Driving Pressure

Answer 4

• Estimate of respiratory driving pressure for speech
  
  • Subglottal pressure-indication device
    -Ability to sustain 5 cmH2O for 5 seconds
• Ability to sustain 10 cmH2O for 10 seconds