Caloric Testing for Vestibular System Impairment Questions and Answers Fully Solved Graded A+

Caloric Testing for Vestibular System Impairment Questions and Answers Fully Solved Graded A+

Caloric Testing - AnswersIndirect test of VOR by tricking brain into head movement perception

Calorics - AnswersEvaluate each ear independently for unilateral vestibular impairment

Peak Response - AnswersMaximum VOR response measured after irrigation

COWS - AnswersCool = opposite, warm = same direction nystagmus beats

Delay - Answers10 seconds for nystagmus or vertigo response to occur

Controllable Factors - AnswersInclude temperature, volume, duration, alerting, cerumen

Uncontrollable Factors - AnswersEar anatomy, body temp, perforations, patient cooperation

Cold Irrigation Physiology - AnswersDense endolymph causes nystagmus away from stimulus

Warm Irrigation Physiology - AnswersLess dense endolymph causes nystagmus towards stimulus

Water Irrigation - Answers250ml, 30s, 44/30 C (+/- 7 body temp)

Air Irrigation - Answers8 liters, 1 min, 50/24 C (+/- 13 body temp)

Caloric Inversion - AnswersIncorrect nystagmus direction due to cooling effect

Fixation - AnswersNystagmus fatigue post-peak response with fixation

Fixation Suppression - AnswersEvaluating ability to suppress VOR response

Caloric Response Peak - AnswersOccurs around 30-60 seconds post-irrigation

Fixation Suppression Test - AnswersEvaluates VOR suppression with fixation

Normal Fixation - AnswersAt least 50% reduction in nystagmus SPV with fixation

Caloric Interpretation - AnswersIncludes nystagmus symmetry, response equality, fixation

Unilateral Weakness Calculation - Answers(RC + RW) - (LC + LW) / sum; >22% asymmetry indicates UW

Bilateral Hypofunction - AnswersSum < 22 or RC+RW < 12 deg and LC+LW < 12 deg

Directional Preponderance - AnswersDifference in intensity between right and left beating responses

Inversion - AnswersCaloric response beating opposite to expected direction