Histopathologic damage to vessels in head and neck microsurgery

Hyperbaric oxygen therapy outcomes in post-irradiated patient undergoing microvascular breast reconstruction: A preliminary retrospective comparative study

Introduction

Radiotherapy is a challenge in autologous breast reconstruction because of its impact on cutaneous and vascular systems. Hyperbaric oxygen therapy (HBOT) is a recognized treatment of radiation-related complications. We aimed to assess the impact of perioperative HBOT on irradiated breast microvascular reconstructive outcomes.

Method

We reviewed the medical charts of patients who received radiotherapy and then underwent secondary free autologous breast reconstruction at our institution. Data on demographics, HBOT protocol, intervention characteristics and post-operative complications were collected. Outcomes of the irradiated patients were then compared between the HBOT and non-HBOT groups.

Results

Fourteen patients were included (11 unilateral and 2 bilateral deep inferior epigastric artery perforator flaps and 1 free transverse rectus abdominis muscle flap). Seven patients received HBOT and 7 did not. In the non-HBOT group, there were 1 Clavien-Dindo grade II, 1 Clavien-Dindo grade IIIa and 2 Clavien-Dindo grade IIIb post-operative complications. In the HBOT group, there were 3 Clavien-Dindo grade I, 1 Clavien-Dindo grade IIIa and 2 Clavien-Dindo grade IIIb post-operative complications. The mean operative time was 452.3 minutes (SD ±62.4 minutes) for unilateral cases without HBOT and 457.8 minutes (SD ±102.1 minutes) with HBOT (p=0.913). Mean ischaemia time per flap without HBOT was 109.4 minutes (SD ±51.8 minutes) versus 80.1 minutes (SD ±37.7 minutes) in the HBOT group (p=0.249).

Conclusion

This study provides insights into the potential of HBOT treatment in preparing patients with irradiated breast cancer for secondary autologous reconstruction.

The usefulness of the IMAP propeller flap for trachea and tracheostome reconstruction after resection of parastomal recurrence of squamous cell carcinoma following salvage total laryngectomy

PURPOSE

Parastomal recurrence of squamous cell carcinoma (SCC) with tracheal involvement following salvage total laryngectomy after prior concurrent chemoradiotherapy is one of the most insidious challenges in head and neck surgery because a complex reconstruction is often required for covering a large area of skin loss, filling the dead space beneath, tracheal reconstruction and suspension, and tracheostome resurfacing. The aim is to describe our experience with the internal mammary artery perforator (IMAP) propeller flap for tracheal and tracheostome reconstruction and neck resurfacing after parastomal and cervical trachea resection, especially for suspension and anchoring the stump of the residual distal trachea to the island flap itself.

METHODS

We describe IMAP flap reconstruction after resection of parastomal recurrence of SCC requiring cervical trachea resection in five patients between January 1, 2005 and August 30, 2019.

RESULTS

IMAP propeller flap was successfully used for reconstruction after complex resection of parastomal recurrence of SCC with cervical trachea involvement in all cases. The mean length and width were, respectively, 16.8 cm (range 13-23) and 6.9 cm (range 5.5-8). We did not report complications of both the donor and the recipient site. Pharyngo-cutaneous or tracheoesophageal fistulas and wound dehiscence were not observed.

CONCLUSIONS

to the best of our knowledge, this is the first report about the use of the IMAP propeller flap in this more complex clinical setting and we provide the message that this surgical procedure is worthy of consideration.

Internal mammary perforator vessels as recipient site for microsurgical breast reconstruction: a comparative histomorphometric analysis and incidence of degenerative vascular changes

BACKGROUND

In microsurgical breast reconstruction, an adequate selection of recipient vessels is crucial for a successful outcome. Although the internal mammary (IM) vessels offer an attractive option, the internal mammary perforator (IMP) vessels are becoming a reliable alternative. The purpose of this study is to investigate the external diameters, lumen area, and atherosclerotic lesions changes of the IMP, IM, and deep inferior epigastric (DIE) vessels through quantitative and qualitative histomorphometric analysis.

METHODS

Ninety-six vessels of bilateral IM, IMP, and DIE vessels from 16 fresh female cadavers were evaluated. Mean age was 54.06 ± 5.7 years. External diameters, lumen area, and degenerative changes of the tunica intimae and media were analyzed by qualitative histomorphometric analysis.

RESULTS

Seventy-one vessels (20 IM, 31 IMP, and 20 DIE vessels) were included in the final histological analysis. A statistically lower external diameters and lumen area were presented by the IMP. The DIE vessels showed a lower incidence (10%) of moderate and severe intimal layer degenerative changes (P = 0.0589). The IMP and DIE vessels showed a lower incidence (9.4 and 25%, respectively) of major media layer degenerative changes (P = 0.0001). No major arterial degenerative lesions were observed in the IMP arteries.

CONCLUSION

Although the IMP external diameters and lumen area were lower than the IM, the results of this study indicated that the tunica media layer in the IMP is less damaged than the other recipient vessels. The results of the comparative histological study permitted to describe additional advantages and disadvantages of using IMP as a recipient vessel for free flap breast reconstruction.

Influence of diabetes mellitus on postoperative complications and failure in head and neck free flap reconstruction: a systematic review and meta-analysis

We performed a systematic review and meta-analysis to determine whether diabetic patients have an increased rate of postoperative complications compared to nondiabetic patients after head and neck free flap reconstruction. A systematic review of PubMed Database between 1966 and 2012 was performed. RevMan 5.0 was used for meta-analysis. A retrospective medical chart review of 7890 patients to identify those who had a failed microsurgical reconstruction of the head and neck region at Chang Gung Memorial Hospital was also carried out. The result revealed that patients with diabetes mellitus have a 1.76 increased risk of complications (odds ratio [OR] = 1.76; 95% confidence interval [CI] = 1.11-2.79) with minimal heterogeneity (I( 2)  = 22%; p = .28). The prevalence of diabetes mellitus in patients with failed free flaps for head and neck reconstruction is 15%. The incidence of diabetes mellitus in these patients with failed free flaps is 2.3 times higher than in the general population.

Effect of neoadjuvant chemoradiation and postoperative radiotherapy on expression of heat shock protein 70 (HSP70) in head and neck vessels

Background

Preoperative radiotherapy and chemotherapy in patients with head and neck cancer result in changes to the vessels that are used to construct microsurgical anastomoses. The aim of the study was to investigate quantitative changes and HSP70 expression of irradiated neck recipient vessels and transplant vessels used for microsurgical anastomoses.

Methods

Of 20 patients included in this study five patients received neoadjuvant chemoradiation, another five received conventional radiotherapy and 10 patients where treated without previous radiotherapy. During surgical procedure, vessel specimens where obtained by the surgeon. Immunhistochemical staining of HSP70 was performed and quantitative measurement and evaluation of HSP70 was carried out.

Results

Conventional radiation and neoadjuvant chemoradiation revealed in a thickening of the intima layer of recipient vessels. A increased expression of HSP70 could be detected in the media layer of the recipient veins as well as in the transplant veins of patients treated with neoadjuvant chemoradiation. Radiation and chemoradiation decreased the HSP70 expression of the intima layer in recipient arteries. Conventional radiation led to a decrease of HSP70 expression in the media layer of recipient arteries.

Conclusion

Our results showed that anticancer drugs can lead to a thickening of the intima layer of transplant and recipient veins and also increase the HSP70 expression in the media layer of the recipient vessels. In contrast, conventional radiation decreased the HSP70 expression in the intima layer of arteries and the media layer of recipient arteries and veins. Comparing these results with wall thickness, it was concluded, that high levels of HSP70 may prevent the intima layer of arteries and the media layer of vein from thickening.

Double vascular anastomosis in the neck for reliable free jejunal transfer

To reduce the possibility of necrosis in free jejunal transfer after total pharyngolaryngo-oesophagectomy, we made a second set of arterial and venous anastomoses in addition to the usual cervical arterial and venous anastomoses. To obtain two different arterial flows (carotid and subclavian systems), the recipient arteries were the superior thyroid and the transverse cervical. For venous flow, the internal and external jugular veins were used. All flaps survived. This procedure, which is limited to the already dissected neck with no procedures in other areas, is less invasive than others. Its advantages are that when one vessel has thrombosed the other vessel functions as a safety valve, and the greater pliability of the vascular pedicles makes it easier to reach the recipient vessels. Because this method is theoretically safe and results in less possibility of losing a flap when the anastomosis is unreliable, the double-pedicled transfer can be an option for safer free jejunal transfer.

Timing of radiotherapy in head and neck free flap reconstruction--a study of postoperative complications

The local treatment protocol of preoperative radiotherapy in head and neck cancer treatment at the Karolinska University Hospital has resulted in a unique cohort of preoperatively high dose-irradiated patients. In total 216 consecutive patients were reviewed, of whom 221 free flaps, for head and neck cancer reconstruction, were operated between 1984 and 2002. In 194 cases radiotherapy was administered preoperatively and 27 operations were performed without prior radiation. The radiation dose was 64 Gy in 147 cases, 54 Gy or less in 45 cases and uncertain in two cases. In order to study whether the time elapsed between the end of radiotherapy and surgery had any significance regarding postoperative events, the cohort was subsequently divided into three groups: patients operated on within 4 weeks (n=27), between 4 and 6 weeks (n=88) and more than 6 weeks (n=78) after the last radiotherapy session. Postoperative complications were analysed in relation to preoperative dose and timing of radiotherapy. Preoperative radiotherapy was related to an increased risk of free flap necrosis as 22 complete and eight partial flap necroses occurred in the group that had received preoperative radiotherapy and none were observed in the non-irradiated group (P<0.05). Furthermore, a linear trend of increased flap loss (P<0.001), infections (P<0.001) and delayed wound healing (P<0.001) was seen when time increased between the last radiotherapy session and surgery. The largest increase in all complication rates was seen when more than 6 weeks elapsed between last radiotherapy session and surgery. Postoperative complications were independent of the radiation dose given. Our data show an increased morbidity in free flap surgery in the head and neck region after preoperative radiotherapy. Furthermore, time elapsed between the last radiotherapy session and surgery is associated with the risk of developing postoperative complications. We strongly suggest that free flap reconstruction should be performed within 6 weeks of the last radiotherapy session.

Cutaneous oncologic and cosmetic surgery in geriatric patients

A wide array of surgical procedures is available to geriatric patients. These interventions can enhance the appearance of patients and facilitate the removal of skin cancers. Pre-existing medical conditions of geriatric patients must be considered comprehensively when selecting and performing cutaneous surgical procedures. Many older patients suffer from a variety of diseases and take a variety of medications and herbal supplements to ameliorate the consequences of such diseases. In general, skin surgery can be performed safely on even very old patients, provided precautions are followed. The biopsychosocial well-being and essence of patients must also be addressed when performing dermatologic surgery. If patients are treated holistically and comprehensively, their surgical experience can be enhanced and their health and appearance improved.

Severe atherosclerosis of the radial artery in a free radial forearm flap precluding its use

The free radial forearm flap is the most frequently used free flap for head and neck reconstructions. Survival of free flaps is dependent on adequate blood supply. A 69-year old woman was scheduled for excision of a T3N0M0 oropharyngeal carcinoma, neck dissections and reconstruction with a free vascularized radial forearm flap. During the operation it appeared that the entire radial artery was almost completely obstructed by atherosclerotic plaques precluding microvascular anastomosis. Despite systemic risk factors certain artery types are more prone to develop clinically manifest atherosclerosis. There are no reports on the pathology of the radial artery in free flap reconstructions. In head and neck cancer patients severe atherosclerosis of the radial artery is very rare, but if present makes free radial forearm flap reconstruction impossible. Therefore, in patients with risk factors for peripheral vascular disease screening for radial artery stenosis should be considered.