CPA

Question 1

CPA based assessments

Answer 1

1. Ear specific thresholds for 2,500, 4 &1 if required (same rules as ABR)
2. BC for 2, 500, 4
3. DPOAE & noise thresholds @ nominal F2 values of 1.5,2,3,4kHz
4. Tymp with LF probe tone
5. ART for 1kHz and 2kHz & 500Hz if possible

Question 2

Threshold seeking

Answer 2

Same as VRA

Question 3

Indications for SF CPA

Answer 3

1. Failure to obtain ear-specific thresholds

2. Demonstration of non-responsiveness

Question 4

CPA sound stimulus

Answer 4

Continuous FM-warbled

Question 5

KTT

Answer 5

1. Closed-set task: suitable for young children

2. SDT

Question 6

Normal passing level for CPA

Answer 6

20dB HL

Question 7

ANSD inference from CPA

Answer 7

Clear normal DPOAE + presence of reliable CPA thresholds @ or >55dB HL —> Almost certain ANSD
High intensity click ABR should be considered

Question 8

Normal hearing (=audiometrically normal)

Answer 8

1. AC HL @20dB HL with confidence based on behavioural audiometry for all freq.
2. No audio metric indications of ANSD
3. No retrocochlear indications
   * * ABR based audiometry doesn’t rule out slight HL

Question 9

HL present

Answer 9

1. > 35dBeHL for 500Hz & >30dBeHL for 1,2,4kHz with confidence (ABR)
2. > 20dB HL for all freq (CPA & VRA)
3. ANSD is strongly indicated

Question 10

PCHL present

Answer 10

1. BC >30dB eHL OR
2. AC >70dB or greater in the absence of BC testing OR
3. ANSD strongly indicated

Question 11

Minor CHL

Answer 11

Minor elevations of ABR threshold @500Hz ONLY

HL must be reported as present, but PCHL absent