The role of radiotherapy and musculocutaneous flaps in oropharyngocutaneous fistulas

Management of Salivary Fistulas After Microvascular Head and Neck Reconstruction

Salivary fistulas after head and neck microvascular reconstruction are difficult problems whose treatment remains controversial. Although aggressive, early operative intervention has been suggested by some groups, we have found that many patients respond to conservative management with bedside debridement and aggressive local wound care. The purpose of this study was, therefore, to review our experience with the management of postoperative salivary fistulas.

METHODS

A retrospective review was performed and all patients who developed a salivary fistula after microvascular head and neck reconstruction over a 7-year period at Memorial Sloan-Kettering Cancer Center were identified and evaluated.

RESULTS

Six hundred thirty-seven patients underwent reconstruction during the study period. Of these, 35 patients developed a postoperative salivary fistula (5.4%). The majority of patients (81%) who developed fistulas shortly after the index procedure (<30 days) were successfully treated with conservative management. Similarly, 50% of late salivary fistulas (>30 days) responded to bedside debridement and wound care. There were no significant differences in the rate of total flap loss, carotid artery blowout, delay in onset of adjuvant radiation therapy (>6 weeks), or return to oral feeds between the conservative and operatively managed groups.

CONCLUSIONS

Aggressive surgical intervention in early postoperative salivary fistulas is usually not necessary, although the treatment plan should be individualized. Bedside debridement and aggressive wound care are adequate in most cases of early salivary fistulas. This approach is not associated with an increased rate of complications.

Critical oropharyngocutaneous fistulas after microsurgical head and neck reconstruction: indications for management using the "tissue-plug" technique

Despite advances in head and neck reconstruction with free-tissue transfer techniques, oropharyngocutaneous fistulas continue to present challenging and potentially lethal complications. The authors present a system for prioritizing these fistulas and the surgical management of nine patients in whom critical fistulas developed after microsurgical head and neck reconstruction. The indications for aggressive management of these fistulas were primarily dependent on their location. Three peristomal and six midneck fistulas were considered critical because of the risk of aspiration pneumonia and carotid artery blowout, respectively. Fistulas located in the submental and/or submandibular region were considered noncritical and were managed conservatively. Using the concept of a "tissue plug" for fistula repair, a dermal component (i.e., a deltopectoral or pectoralis major pedicled flap) is guided through the fistula, and with external traction the tissue "plugs" the tract. No sutures are placed directly in the surrounding friable tissue. There were no partial or total flap losses. There were two fistula recurrences in patients who had received postoperative radiation therapy. One of these recurrences was due to tumor recurrence within the previous fistula and was managed with palliative measures. The other fistula recurrence was closed with a local-flap procedure on an outpatient basis. All patients resumed oral feeding, except for the patient in whom tumor recurrence was suspected. This tissue-plug technique can be used in the management of critical peristomal and/or midneck oropharyngocutaneous fistulas not only to obliterate the tract but also to augment volume and vascularity in already damaged, ischemic, and deficient tissue.

Factors associated with complications in microvascular reconstruction of head and neck defects

The use of microvascular free tissue transfer has allowed the reconstruction of increasingly complex defects in higher risk patients after head and neck cancer resections. However, the combination of these factors also gives rise to a higher risk for the development of complications. This study was performed to establish the pretreatment factors associated with complication development after microvascular free tissue transfer for the reconstruction of defects resulting from head and neck cancer ablations, with particular attention to the role of comorbid conditions. A retrospective cohort study was conducted including 200 consecutive microvascular free tissue transfers performed for the reconstruction of surgical defects in the head and neck region at a single tertiary care institution. Comorbidity severity was assessed using the Charlson comorbidity index, a novel approach to comorbid staging in this setting. The flap survival rate was 98 percent. Complications developed in 56 cases (28 percent), with multiple complications occurring in 21 of these cases (10.5 percent). Univariate analysis revealed that prior radiation treatment (p = 0.03), anesthesia time over 10 hours (0.05), and advanced Charlson comorbidity grade (0.002) were associated with an increased risk for the development of complications. However, only the presence of advanced Charlson grade proved significant after multivariate analysis (odds ratio 3.9; 95 percent CI = 1.5 to 10.1). In addition, increasing Charlson grade (p = 0.003) and age over 70 years (p = 0.04) correlated with increasing complication severity. Systemic complications occurred in 28 patients (14 percent), with advanced Charlson grade being the only significant factor associated with the development of complications after controlling for confounding factors (odds ratio 3.8; 95 percent CI = 1.5 to 9.7). In patients over 70 years of age, increasing operative time also impacted on the development of systemic complications (p = 0.002), especially in patients with advanced Charlson grades (0.01). Recipient site complications occurred in 30 patients (15 percent), with history of prior radiation therapy being the only factor associated with increased risk by multivariate analysis (odds ratio 2.5; 95 percent CI = 1.1 to 5.7). No factors predicted the development of donor-site complications, which occurred in 11 cases (5.5 percent). The median hospital stay for the entire population was 16 days. The development of complications increased the median hospital stay by 7.5 days (p < 0.001). The effect of the development of complication on hospital stay remained significant even after controlling for the effects of confounding variables (relative risk = 9.87; 95 percent CI = 5.9 to 19.9). Microvascular surgery is a highly successful and relatively safe method for the reconstruction of large head and neck defects. The Charlson comorbidity index grading may be useful for identifying patients at increased risk for the development of complications after microvascular reconstruction, allowing for improved perioperative planning. In addition, patients with prior radiation exposure have a significantly higher risk for developing complications at the recipient site. Although advanced age is not associated with an increased risk for complications, older patients may be more sensitive to the effects of prolonged anesthesia and are likely to develop more severe complications.