2.2 Criteria for inclusion
The criteria for the article to be included were: 1) retrospective,
original or prospective researches involving the effect of vertigo on
the hearing prognosis in people with SSHL; 2) researches reporting on
the outcome of PTA in patients and the number of patients who improved;
3) studies involving a clear treatment plan; and 4) studies involving a
patient population with or without vestibular symptoms. Studies that did
not include hearing recovery rates or vertigo and studies with pregnant
women were eliminated, as were practice guidelines, letters, reviews,
editorials, theories, reports, and cases.