[Results of tympanoplasty following application of cartilage-perichondrium transplants for tympanic membrane substitution under unfavorable circumstances]

[The cartilage graft in middle ear microsurgery. Indications, technique, results]

AIM

The use of cartilage in tympanoplasties in the shape of monolytic cartilage-perichondrium autografts or several particles as a cartilage-palisade.

MATERIALS AND METHODS

The retrospective analysis concerned 216 clinical cases. The cartilage palisade technique was performed in 163 tympanoplasties. In 53 cases the tympanoplasty was carried out with the use of the monolytic cartilage-perichondrial composite graft: cartilage-island, cartilage-cork or cartilage-mat.

RESULTS

In the type I and II of tympanoplasty the air bone gap (ABG) <10dB showed 70% of patients operated with the use of monolytic cartilage-perichondrial composite autografts and 73% using the cartilage-palisade technique.

CONCLUSIONS

The usefulness of cartilage in tympanoplasties is much the same in cartilage-palisade technique as well as in monolytic, non-palisade technique.

[Microsurgical middle ear operations : Variability of the audiometric results from frequency variations]

INTRODUCTION

The audiometric results after reconstructive tympanic surgery on 504 patients carried out between October 2005 and October 2007, including 190 cases of tympanoplasty type I and 314 cases of tympanoplasty type III according to Wullstein, were retrospectively analyzed at the Department of Otolaryngology, Ruprecht-Karls-University in Heidelberg.

PATIENTS AND METHODS

To investigate the influence of the frequencies used to compare the outcome, the pure tone average air-bone gaps (PTA-ABG) of the preoperative and postoperative audiograms of tympanoplasties type I and III were analyzed. The frequencies covered the ranges of 0.5 kHz, 1 kHz, 2 kHz, 4 kHz and 6 kHz. In each case the 3-frequency, 4-frequency and 5-frequency analyses were calculated for the different surgical groups.

RESULTS

The 3-frequency analysis (0.5 kHz, 1 kHz and 2 kHz) of the type 1tympanoplasties were 18.8 ± 11.8 dB preoperative and 12.3 ± 11.8 dB postoperative. In 58.9% of cases the PTA-ABG ≤ 10 dB and in 86.7% it was ≤ 20 dB. The 3-frequency analysis showed that the tympanoplasties type III had a PTA-ABG of 30.6 ± 15.3 dB preoperatively and 21.8 ± 15.1 dB postoperatively. In 30.4% of cases the PTA-ABG was ≤ 10 dB and ≤ 20 dB for 56%.

DISCUSSION

The detailed itemization of frequencies in this study and the consequent opportunity to modify the frequency range, allowed the impact of this selection on the PTA-ABG to be illustrated and various comparisons with other studies could be carried out. In this article, the exclusion criteria were dealt with liberally and risk patients were also included and data from patients who displayed prognostic risks regarding the successful surgery in terms of the audiometric reports were integrated. These prognostic risks were due to the poor aeration of the tympanum and recent (sometimes diverse), pre-surgery as well as chronic inflammatory processes. This study has proved that all surgery collectives showed significant improvements of the PTA-ABG. Therefore, all surgery collectives (measured against the audiometric evaluation) benefited from the surgery.

Trommelfellrekonstruktion mit Knorpel

Autogenous cartilage-perichondrium-composite-grafts have become essential and well established transplant materials in reconstructive middle ear surgery. They have proven to be particularly appropriate for surgical situations which benefit from the bradytrophy and stiffness of the cartilage (adhesive otitis, retraction pockets, subtotal tympanic membrane defects, revision tympanoplasty). Of the numerous techniques available, the perichondrium-island technique and the palisade-cartilage technique are described in detail in this review, also regarding modifications and comments in the literature. Both methods show good functional and morphological results and should be chosen according to individual surgical requirements. The data of experimental investigations are involved in the decision which technique should be favored.

Cartilage palisade tympanoplasty and diving

OBJECTIVE

To determine whether a patient with a serious defect of the tympanic membrane (TM) will be able to dive after surgery.

PATIENTS AND METHODS

The authors describe three patients who were divers with serious defects of the TM (more than 75% of TM). In all three cases, cartilage palisade tympanoplasty was used to reconstruct the TM.

RESULTS

Six months after surgery, the patients passed clinical examinations, audiograms (hearing restored to normal), tympanometry (increased stiffness of the TM), and pressure tolerance tests in hyperbaric chamber (30-m immersion was simulated for 4 minutes), and they began to dive again. Approximately 2 years after the surgery, all three patients are able to dive without any difficulties.

CONCLUSION

The authors conclude that patients can dive after cartilage palisade tympanoplasty.