Free flap reconstruction of the head and neck: analysis of 241 cases

Free Flap Reconstruction of the Oropharynx

Reconstruction of the oropharynx plays a critical role in preserving quality of life after surgical resection of oropharyngeal carcinoma. Free tissue is one of several reconstructive options, which can closely approximate native oropharyngeal anatomy and lead to favorable functional outcomes in carefully selected patients. Here, the authors provide an overview of the indications, treatment options, functional outcomes, potential complications, and future considerations for free flap reconstruction of the oropharynx.

Novel Challenges and Opportunities for Anesthesia and Perioperative Care in Microvascular Flap Surgery: A Narrative Review

Complex microvascular techniques and in-depth knowledge of blood rheology and microanastomosis function are required for success in microvascular flap surgery. Substantial progress has been achieved in preventing complications, but the rate of flap loss is still significant and can have significant adverse effects on the patient. Flap thrombosis, flap hematoma, and flap loss are the most frequent and severe major surgical complications. Advances in understanding the pathophysiology of different flap complications, the use of preoperative risk assessment and new treatment concepts could improve the perioperative care of microvascular flap surgery patients. Our aim was to outline novel avenues for best practice and provide an outlook for further research of anesthesia and perioperative care concepts in microvascular flap surgery.

From Simple to Complex: Preserving and Reconstructing the Traumatized Thumb

Traumatic thumb injuries significantly affect overall hand function and may result in considerable disability. Reconstructing the traumatized thumb requires a detailed preoperative assessment of the defect and evaluation of the patient's social history and medical comorbidities. Reconstructive techniques can be stratified by the level of thumb injury. The goals of thumb reconstruction are to restore length, stability, mobility, and sensibility. This article reviews reconstructive principles and operative techniques for reconstructing the traumatized thumb.

Impact of Negative Pressure Wound Therapy on Perfusion Dynamics in Free Latissimus Dorsi Muscle Flaps

Background: Free muscle flaps can develop significant postoperative edema and wound exudation, thereby increasing interstitial pressure and potentially compromising microcirculation. While concerns exist regarding negative pressure wound therapy (NPWT) to compress free flaps and hinder monitoring, recent studies have indicated a reduction in edema and an increase in blood flow. Objective: To compare microcirculation in free latissimus dorsi muscle (LDM) flaps dressed with and without NPWT. Methods: This retrospective cohort study analyzed prospectively collected data of patients who received free LDM flap reconstruction. Patients were separated into two groups according to management with or without NPWT. Microcirculation was evaluated continuously for up to 72 h utilizing laser doppler flowmetry and tissue spectrometry. Results: In total, n = 61 patients (26 females, 35 males) with an average age of 56.90 (17.4) years were included. NPWT was applied in 12 patients, while a regular cotton dressing was used in 49 patients. Overall, no significant differences in the number of minor and major complications were observed between groups. Both groups showed an increase in microvascular flow over the investigated time period. The flow showed higher absolute values in the NPWT group, reaching statistical significance at 12 h post-anastomosis, p = 0.038. There was a tendency for lower rHb values in the NPWT group, without reaching statistical significance. Conclusions: The presented study confirms the increase in microvascular flow after NPWT application. Whilst ensuring continuous free flap monitoring utilizing laser doppler flowmetry and spectrometry, the data further support the safety of NPWT application without risking vascular compromise due to external compression.

Ultrasonic Shears Decrease Postoperative Hematomas in Head and Neck Microvascular Reconstruction

OBJECTIVE

To evaluate postoperative hematoma and takeback rates in a large series of microvascular reconstructions. We sought to determine whether the use of ultrasonic shears reduced these rates.

STUDY DESIGN

Retrospective cohort study.

SETTING

Tertiary referral hospital.

METHODS

A total of 2288 patients undergoing free flap reconstruction for head and neck defects between 1995 and 2022 were reviewed. Patients undergoing dissection with and without ultrasonic shears were compared to determine postoperative hematoma and takeback rates.

RESULTS

The overall hematoma rate was 1.3% (29/2288) for the entire cohort. The postoperative hematoma rates with and without ultrasonic shears were 0.63% (9/1418) and 2.3% (20/870), relative risk = 0.28, P = .0015. Of 870 patients undergoing surgery without ultrasonic shears, 14 (1.61%) were taken back to the operating room for control of bleeding compared to 8 of 1418 (0.56%) in the ultrasonic shears cohort.

CONCLUSION

Our large series of patients undergoing microvascular reconstruction shows a decrease in postoperative hematoma rate and takeback for bleeding with the adoption of ultrasonic shears. Ultrasonic shears are an effective tool that can help decrease perioperative morbidity secondary to hematoma after head and neck tumor resection and microvascular reconstruction.

Predictive factors of postoperative complications related to free flap reconstruction in head and neck cancer patients admitted to intensive care unit: a retrospective cohort study

BACKGROUND

The epidemiology and risk factors for postoperative complications related to free flap reconstruction in head and neck cancer patients admitted to the Intensive Care Unit (ICU) are unknown.

METHODS

We performed a retrospective cohort study of patients with free flap reconstruction of head and neck cancer between September 2015 and April 2023 admitted to the ICU of Beijing Tongren Hospital. The univariate and multivariate analyses were used to explore the risk factors for postoperative complications related to free flap reconstruction admitted to ICU, including flap necrosis, bleeding, fistula, and infection.

RESULTS

A total of 239 patients were included in this study, and 38 (15.9%) patients had postoperative complications related to free flap reconstruction. The median length of ICU stay was 1 day (interquartile range, 1-2 days). Multivariate analysis found that low BMI (P < 0.001), high postoperative CRP (P = 0.005), low hemoglobin (P = 0.012), and inadequate fluid intake (P < 0.05) were independent risk factors for complications.

CONCLUSIONS

Postoperative complications related to free flap reconstruction were common in this ICU population. Careful fluid management and monitoring of CRP and hemoglobin levels may reduce complications.

Tubed myocutaneous pectoralis major flap: A rescue option in esophagus reconstruction

This article presents a complex case of total pharyngoesophageal defect reconstruction in a patient with recurrent supraglottic squamous cell carcinoma. After failed attempts with free microsurgical techniques due to complications, a tubed myocutaneous pectoralis major flap was successfully employed. The procedure aimed to achieve alimentary continuity, speech, and swallowing functionality. Despite initial challenges and concerns about stenosis, the reconstruction of a total pharyngolarygectomy defect resulted in a good functional outcome, although minor deficits in neck mobility and aesthetic donor zone deformities were noted. The case highlights the broad armamentarium of reconstruction techniques that plastic and aesthetic surgery teams must be trained, namely the myocutaneous pectoralis major flap which in selected cases can be the end solution.

Bilateral Simultaneous Lumbar Artery Perforator Flaps in Breast Reconstruction: Perioperative Outcomes Addressing Safety and Feasibility

BACKGROUND

The lumbar artery perforator (LAP) flap has emerged as an excellent option for breast reconstruction, but its steep learning curve makes it less approachable. Furthermore, length of the operation, flap ischemia time, need for composite vascular grafts, complex microsurgery, multiple position changes, and general concern for safety has led experienced surgeons to stage bilateral reconstructions. In the authors' experience, simultaneous bilateral LAP flaps are feasible, but overall perioperative safety has not been fully explored.

METHODS

Thirty-one patients (62 flaps) underwent simultaneous bilateral LAP flaps and were included in the study (excluding stacked four-flaps and unilateral flaps). Patients underwent two position changes in the operating room: supine to prone and then supine again. A retrospective review of patient demographics, intraoperative details, and complications was performed.

RESULTS

The overall flap success rate was 96.8%. Five flaps were compromised postoperatively. The intraoperative anastomotic revision rate was 24.1% per flap (4.3% per anastomosis). The significant complication rate was 22.6%. The number of sustained hypothermic episodes and hypotensive episodes correlated with intraoperative arterial thrombosis ( P < 0.05). The number of hypotensive episodes and increased intraoperative fluid correlated with flap compromise ( P < 0.05). High body mass index correlated with overall complications ( P < 0.05). The presence of diabetes correlated with intraoperative arterial thrombosis ( P < 0.05).

CONCLUSIONS

Simultaneous bilateral LAP flaps can be performed safely with an experienced and trained microsurgical team. Hypothermia and hypotension negatively affect the initial anastomotic success. In this complex operation, a coordinated approach between the anesthesia and nursing team is paramount for patient safety.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, IV.

Impact of intraoperative fluid administration and complications in head and neck cancer free flap surgery at a tertiary care hospital of a low and middle-income country

Perioperative fluid administration plays an essential role in head and neck cancer free flap surgery. The impact of intraoperative fluid administration on postoperative complications in head and neck cancer free flap surgery remains ill-defined. All adult patients who underwent a free flap surgery for head and neck cancer between January 2014 and December 2018 were included in the study. A total of 224 patients met the inclusion criteria. The mean age of patients was 45.0 years, and the majority were male (85.7%). Buccal mucosa squamous cell carcinoma (83%) was the most common diagnosis, and anterolateral thigh flap (46.4%) was the most routinely performed procedure. Perioperatively, ringer's lactate was used most abundantly (68.3%). A total of 101 complications were reported in the postoperative period, consisting of 67 medical complications and 34 surgical complications. In conclusion, there is no statistically significant association between the quantity of fluid administration and postoperative complications.

Flap loss in head and neck reconstruction: Is there a singular cause for failure?

Despite the high success rates reported in head and neck reconstruction, free flap failures continue to persist. Understanding the factors associated with flap loss and improving overall success are paramount. This study aimed to comprehensively assess the factors influencing flap revision and free tissue transfer survival in head and neck reconstruction. The study included 70 patients with defects in the lower two-thirds of the head and neck region and underwent reconstruction using free flaps. Patient age, gender, smoking status, comorbidities and data on the location and aetiology of the defect, the specific type of flap employed, the recipient artery and vein chosen, instances of revision and the overall success of the flap were collected. The investigation aimed to establish correlations between these variables as well as flap success and revision rates. No statistically significant differences were observed in arterial and venous anastomosis revision rates, or flap survival, in relation to variables such as age, gender, flap type, smoking status, comorbidities, recipient artery or vein and the number of vein anastomoses. The malignant tumour group exhibited a lower requirement for arterial revision and a higher flap survival rate compared to the benign tumour group. This study underscores the comparable safety profiles of perforator-based and conventional flaps in head and neck reconstruction. Furthermore, it reveals that patient characteristics are not contraindications for free tissue transfer. Additionally, the quantity of the veins and choice of recipient vessels are flexible and do not significantly impact flap success. The higher rates of flap success in patients with malignant aetiology requires further investigation.

Effect of machine learning-guided haemodynamic optimization on postoperative free flap perfusion in reconstructive maxillofacial surgery: A study protocol

AIMS

Intraoperative hypotension and liberal fluid haemodynamic therapy are associated with postoperative medical and surgical complications in maxillofacial free flap surgery. The novel haemodynamic parameter hypotension prediction index (HPI) has shown good performance in predicting hypotension by analysing arterial pressure waveform in various types of surgery. HPI-based haemodynamic protocols were able to reduce the duration and depth of hypotension. We will try to determine whether haemodynamic therapy based on HPI can improve postoperative flap perfusion and tissue oxygenation by improving intraoperative mean arterial pressure and reducing fluid infusion.

METHODS

We present here a study protocol for a single centre, randomized, controlled trial (n = 42) in maxillofacial patients undergoing free flap surgery. Patients will be randomized into an intervention or a control group. In the intervention, group haemodynamic optimization will be guided by machine learning algorithm and functional haemodynamic parameters presented by the HemoSphere platform (Edwards Lifesciences, Irvine, CA, USA), most importantly, HPI. Tissue oxygen saturation of the free flap will be monitored noninvasively by near-infrared spectroscopy during the first 24 h postoperatively. The primary outcome will be the average value of tissue oxygen saturation in the first 24 h postoperatively.

Impact of goal-directed hemodynamic therapy on perioperative outcomes in head and neck free flap surgery: A before-and-after pilot study

Background

Free flap reconstruction for head and neck cancer is associated with a high risk of perioperative complications. One of the modifiable risk factors associated with perioperative morbidity is intraoperative hypotension (IOH). The main aim of this pilot study is to determine if the intraoperative use of goal-directed hemodynamic therapy (GDHT) is associated with a reduction in the number of IOH events in this population.

Methods

A before-and-after study design. The patients who had intraoperative GDHT were compared to patients from a previous period before the implementation of GDHT. The primary outcome was the number of IOH episodes defined as five or more successive minutes with a mean arterial pressure <65 mmHg. The secondary outcomes included major postoperative morbidity and 30-day mortality.

Results

A total of 414 patients were included. These were divided into two groups. The control group (n = 346; January 1, 2018, to December 31, 2019), and the monitored group (n = 68; January 1, 2020, to May 1, 2021). The median intraoperative administered fluid volume was similar between the control and monitored groups (2250 interquartile range [IQR] [1607-3050] vs. 2210 IQR [1700-2807] mL). The monitored group was found to have an increased use of norepinephrine and dobutamine (respectively, 1.2% vs. 5.9% and 2.4% vs. 30.9%; p < 0.05). When adjusting for confounders (comorbidities, estimated blood loss, and duration of anesthesia) the incidence rate ratio (95% confidence interval) of number of IOH events was 0.94 (0.86-1.03), p = 0.24. The rate of postoperative flap and medical complications did not differ between the two groups.

Conclusions

Even though the use of vasopressors/inotropes was higher in the monitored group, the number of IOH episodes and postoperative morbidity and mortality were similar between the two groups. Further change in hemodynamic management will require the use of specific blood pressure targets in the GDHT fluid algorithm.

Mandible Reconstruction in a Rural Population: Comparison of Radial Forearm and Free Fibula Flap Outcomes

Comparison of microsurgical reconstructive options after mandible resection is limited in the literature. Fibula free flaps (FFFs) can be costly and have timing limitations, but dental restoration can be performed, with varied reported rates of completion. The radial forearm free flap (RFFF) with mandible plating may be an alternative in select populations. The purpose of this study was to determine if the RFFF has similar outcomes to the FFF for mandible reconstruction in a rural population. A retrospective review of patients who underwent mandibulectomy from 2017 to 2021 at a single tertiary-care academic institution was performed. Those with FFF or RFFF reconstruction were included. Mandible defects were classified using the Jewer-Boyd H-C-L system. Sixty-eight patients were included with 53 undergoing FFF and 15 undergoing RFFF. Immediate reconstruction was significantly more common with RFFF than FFF (100% versus 64.2%; P =0.01). Lateral mandible defects were most common among both groups (52.9% FFF versus 73.3% RFFF; P =0.04). Osseous defect length was similar (9.5 cm FFF versus 7.7 cm RFFF; P =0.07), but soft tissue defect size was significantly larger in the RFFF group (28.6 cm 2 versus 15.3 cm 2 ; P =0.01). Complication rates (47.1% FFF versus 46.7% RFFF; P =0.98) and disease-free status at last follow-up (96.2% FFF versus 80.0% RFFF; P =0.06) were similar. Dental restoration occurred in 21.3% of patients undergoing FFF. Patients undergoing RFFF or FFF reconstruction after mandibulectomy had similar surgical and disease outcomes, with a low rate of completed dental restoration after FFF. Our findings suggest RFFF is a reasonable alternative to FFF for mandible reconstruction in select patients.

Perioperative anticoagulation in head and neck free flap reconstructions: Experience of an anticoagulative scheme and its modification

OBJECTIVES

Microvascular anastomoses in microvascular reconstructions induce rheological changes in the anastomosed vessels and are usually counteracted by anticoagulative medication. There is no regimen commonly agreed on. This study provides an easy to use anticoagulative regimen.

PATIENTS AND METHODS

Consecutive cases of either anticoagulative regimen between 2013 and 2018 that underwent microvascular reconstruction in the head and neck area were included in this retrospective study, resulting in 400 cases in total. Two different anticoagulative regimens were applied to 200 patients in each group: (a) intraoperatively administered unfractionated 5000 I.U. high molecular weight heparin (HMWH) and postoperatively low molecular weight heparin (LMWH, Enoxaparin) 1 mg/kg/body weight postoperatively and (b) intraoperatively LMWH 0.5 mg/kg/body weight as well as 12 h later and 1 mg/kg/body weight postoperatively.

RESULTS

The LMWH cohort showed fewer overall thromboembolic (8.5% vs. 11%; p = .40) and peripheral thrombotic events (1% vs. 3.5%; p = .18) and lung embolisms (3% vs. 4%; p = .59). The number of thromboses at the site of the anastomosis was equally distributed. In regard to flap-specific complications, LMWH was associated with a positive effect, in particular with respect to total flap losses (5% vs. 7%; p = .40) and wound-healing disorders (14.5% vs. 20%; p = .145).

CONCLUSION

Findings indicate that intra- and postoperatively administered LMWH as the only anticoagulative medication seems reliable in our clinical routine of head and neck free flap reconstructions.

Modified intraoperative temperature management prevents prolonged length of stay after head and neck surgery with free flap reconstruction

The present study aimed to investigate the association between intraoperative body temperature and prolonged length of stay (PLOS) after free flap reconstruction. A total of 753 patients who underwent head and neck surgery with free flap reconstruction were collected and randomly assigned into primary and validation cohorts. In the primary cohort, univariable and multivariable analyses were conducted to evaluate associations between intraoperative time-weighted (TW) temperature (TW average [TWA] temperature, TW hypothermia and TW hyperthermia) and PLOS. Nomograms were developed with and without intraoperative TW temperature, and validated in the validation cohort. Severe intraoperative TW hypothermia (OR = 1.004; 95% CI: 1.000, 1.007; p = 0.032) was identified as an independent risk factor for PLOS. Intraoperative TWA temperature and TW hypothermia showed linear related predictive effect for PLOS. The nomogram incorporating intraoperative TW temperature showed higher C-index (0.652, 95% CI: 0.591, 0.713) and improved net reclassification improvement for non-event (0.277, 95% CI: 0.118, 0.435; p < 0.001). Lower TWA temperature with mild TW hypothermia had a preventive effect on PLOS with a linear association, which may provide a modified range for intraoperative temperature management. The proposed nomogram incorporating intraoperative TW temperature could be used to develop personalized preventive strategies for PLOS after free flap reconstruction. IRB NUMBER: SYSEC-KY-KS-2022-037. CLINICAL TRIAL REGISTRATION NUMBER: Not applicable.

Perioperative Factors Affecting the Healing of Rectovaginal Fistula

Rectovaginal fistula is rare, but a severe complication in gynecology, which despite the effort of clinicians is still not treated successfully in many cases. According to statistics, the healing rates of surgery in patients with RVF range from 20 to 100%. The treatment effectiveness depends on the etiology of fistula, the age of the patients, the presence of comorbidities, the type of surgery and many other factors. Considering the low efficiency of treatment and the high risk of recurrence, the question of possible methods to improve the results occurs. In our review, we analyzed both modifiable and non-modifiable factors which may influence the treatment, healing rate and future fate of the patients. Taking into account all analyzed risk factors, including age, comorbidities, smoking status, microbiology, medications, stoma and stool features, we are aware that rectovaginal fistula's treatment must be individualized and holistic. In cases of poorly healing RVF, the drainage of feces, the use of antibiotic prophylaxis or the implementation of estrogen therapy may be useful. Moreover, microbiome research in women with RVF and towards estrogen therapy should be performed in order to create treatment algorithms in women with fistulae. Those interventions, in our opinion, may significantly improve the outcome of the patients.

Enhanced recovery after surgery, current, and future considerations in head and neck cancer

Objectives

Review of the current and relevant literature to develop a list of evidence-based recommendations that can be implemented in head and neck surgical practices. To provide rationale for the multiple aspects of comprehensive care for head and neck surgical patients. To improve postsurgical outcomes for head and neck surgical patients.

Methods

Extensive review of the medical literature was performed and relevant studies in both the head and neck surgery and other surgical specialties were considered for inclusion.

Results

A total of 18 aspects of perioperative care were included in this review. The literature search included 276 publications considered to be the most relevant and up to date evidence. Each topic is concluded with recommendation grade and quality of evidence for the recommendation.

Conclusion

Since it's conception, enhanced recovery after surgery (ERAS) protocols have continued to push for comprehensive and evidence based postsurgical care to improve patient outcomes. Head and neck oncology is one of the newest fields to develop a protocol. Due to the complexity of this patient population and their postsurgical needs, a multidisciplinary approach is needed to facilitate recovery while minimizing complications. Current and future advances in head and neck cancer research will serve to strengthen and add new principles to a comprehensive ERAS protocol.

Level of Evidence

2a.

Healthcare Disparities in Otolaryngology

Purpose of Review

The purpose of this review is to summarize some of the recent research studies on healthcare disparities across various subspecialties within otolaryngology. This review also highlights the impact of COVID-19 pandemic on disparities and proposes potential interventions to mitigate disparities.

Recent Findings

Significant healthcare disparities in care and treatment outcomes have been reported across all areas of otolaryngology. Notable differences in survival, disease recurrence, and overall mortality have been noted based on race, ethnicity, socioeconomic status (SES), insurance status, etc. This is most well-researched in head and neck cancer (HNC) within otolaryngology.

Summary

Healthcare disparities have been identified by numerous research studies within otolaryngology for many vulnerable groups that include racial and ethnic minority groups, low-income populations, and individuals from rural areas among many others. These populations continue to experience suboptimal access to timely, quality otolaryngologic care that exacerbate disparities in health outcomes.

Role of a fluid-restrictive strategy in flap-surgery: A single center retrospective cohort study

In this study, we evaluated the outcomes of flap surgery and the incidence of acute kidney injury (AKI) in patients who underwent flap surgery using a fluid-restrictive strategy. We retrospectively reviewed the consecutively collected medical records of patients who underwent flap surgery using the fluid-restrictive strategy of our hospital. The patients were divided into 2 groups based on the period of flap surgery: 2011 to 2014 (initiation period of the fluid-restrictive strategy) and 2015 to 2020 (implementation period). Outcomes of flap surgery and the incidence of AKI were evaluated based on percentage changes in cumulative fluid balance to initial body weight (%FO) on post-operative day 7. A total of 140 patients were enrolled in the study; 50 (35.7%) underwent flap surgery in 2011 to 2014 and 90 (64.3%) in 2015 to 2020. In 2015 to 2020, the median %FO significantly decreased from 2.7 (interquartile range [IQR]: 0.8-7.1) to 0.1 (IQR: -2.2 to 3.4%, P < .001), whereas the success rate significantly increased from 53.3% to 70.5% (P = .048) compared to 2011 to 2014. The incidence of AKI remained unchanged. In multivariate analysis, the odds ratio for success was 2.759 (95% confidence interval: 1.140-6.679) in 2015 to 2020 compared to 2011 to 2014. After successfully implementing the fluid-restrictive strategy, the success rate of flap surgery significantly increased without any further increase in the incidence of AKI. Our experience could serve as a model for implementing a fluid-restrictive strategy in flap surgery.

A Multi-institutional Analysis of Late Complications in Scapula, Fibula, and Osteocutaneous Radial Forearm Free Flaps

OBJECTIVES

(1) Evaluate the association of flap type with late complications in patients undergoing osseous head and neck reconstruction with the fibula free flap (FFF), osteocutaneous radial forearm free flap (OCRFFF), and scapula free flap (SFF). (2) Compare the prevalence of late complications based on minimum duration of follow-up.

STUDY DESIGN

Retrospective cohort study.

SETTING

Multiple academic medical centers.

METHODS

Patients undergoing FFF, OCRFFF, or SFF with ≥6-month follow-up were stratified by type of flap performed. The association of flap type with late complications was analyzed via univariable and multivariable logistic regression, controlling for relevant clinical risk factors. Additionally, the frequency of late complications by minimum duration of follow-up was assessed.

RESULTS

A total of 617 patients were analyzed: 312 (50.6%) FFF, 230 (37.3%) OCRFFFF, and 75 (12.2%) SFF. As compared with the SFF, the FFF (adjusted odds ratio [aOR], 3.05; 95% CI, 1.61-5.80) and OCRFFF (aOR, 2.17; 95% CI, 1.12-4.22) were independently associated with greater odds of overall late recipient site wound complications. The SFF was independently associated with the lowest odds of hardware exposure when compared with the FFF (aOR, 2.61; 95% CI, 1.27-5.41) and OCRFFF (aOR, 2.38; 95% CI, 1.11-5.12). The frequency of late complications rose as minimum duration of follow-up increased until plateauing at 36 months.

CONCLUSIONS

This multi-institutional study suggests that the long-term complication profile of the SFF and OCRFFF compares favorably to the FFF. The SFF may be associated with the fewest overall late recipient site complications and hardware exposure, while the FFF may be associated with the most of these 3 options.

Effect of operative time on complications associated with free flap reconstruction of the head and neck

OBJECTIVE

To evaluate whether prolonged operative time is negatively associated with post-operative complications and length of stay in patients undergoing microvascular free flap reconstruction for complex head and neck defects.

METHODS

342 consecutive patients undergoing microvascular reconstruction for head and neck defects between 2017-2019 at a single institution were evaluated. Operative outcomes and operative time were compared whilst controlling for patient and treatment related factors.

RESULTS

Mean operative time was 551 min and length of stay was 16.2 days. An 11% increase in the risk of a post-operative complication was observed for every additional hour of operative time (OR 1.11, 95% CI 1.03-1.21, p = 0.011) after adjusting for patient and treatment factors. A cut-off of 9 h yielded a 92% increase in complications on either side of this (OR 1.92, 95% CI 1.18-3.13, p = 0.009). Increased operative time was also associated with increased length of stay and return to theatres, but not medical complications.

CONCLUSION

Prolonged operative time is significantly associated with increased surgical complications, length of stay and return to theatres when performing microvascular reconstructive surgery for head and neck defects.

Clinical outcomes for microvascular reconstruction in oral cancers: experience from a single surgical centre

INTRODUCTION

Reconstruction of a surgical defect is an important part of the management of oral cancers. Microvascular free flap construction provides better functional and cosmetic outcomes.

METHODS

Between 2014 and 2020, some 524 patients underwent microvascular reconstruction. Comorbidity variables were scored using the Charlson Comorbidity Index (CCI). Complications were recorded using Clavien-Dindo criteria.

RESULTS

Eighty-three (15.84%), 339 (64.69%) and 102 (19.47%) patients underwent free radial forearm flap, free anterolateral thigh flap and free fibula osteocutaneous flap (FFOCF), respectively. Clavien-Dindo complications of grade III and above were seen in 39 (7.44%) patients. Total flap loss was seen in 18 patients and of these, 16 were salvaged using alternative free flaps or pedicled flaps. On univariate analysis, overall and major complication rates were higher in FFOCF (p=0.171). Major complications significantly more common in patients with a CCI score >4 (p=0.001). Patients aged >65 years had higher rates of complications (p=0.03).

CONCLUSION

Microvascular free tissue transfer is a reliable, safe and gold standard modality in surgical reconstruction and can be replicated in non-institutional settings.

Preoperative Predictors of Free Flap Failure

OBJECTIVE

Microvascular free tissue transfer is an important reconstructive option for defects of the head and neck. The present study aims to identify preoperative patient- and tumor-specific characteristics, laboratory values, and other risk factors associated with early free flap failure.

STUDY DESIGN

Retrospective cohort study of 1070 patients.

SETTING

Head and neck surgical oncology service at a tertiary care center from 2005 to 2019.

METHODS

Demographics, comorbidities, preoperative laboratory values, treatment history, and cancer stage were collected for consecutive patients who underwent free flap reconstruction of the head and neck and experienced early free flap failure (<8 days from surgery).

RESULTS

In 1070 patients, the prevalence of early free flap failure was 3.8% (n = 41). Female sex (odds ratio [OR], 2.58; 95% CI, 1.36-4.99), presence of peripheral vascular disease (OR, 2.78; 95% CI, 1.05-6.57), and elevated preoperative platelet count (OR, 2.67; 95% CI, 1.20-5.47) were independently associated with risk of early free flap failure.

CONCLUSION

Female sex, peripheral vascular disease, and preoperative thrombocytosis are all strong predictors of early free flap failure. This suggests that hypercoagulability and poor vessel quality may predispose patients to flap loss. Patients with elevated platelets or peripheral vascular disease warrant careful reconstructive decision making and close monitoring in the perioperative period.

Safe and effective thrombolysis in free flap salvage: Intra-arterial urokinase infusion

Despite the high success rate in reconstruction using free tissue transfer, flap failure is often caused by microvascular thrombosis. In a small percentage of cases with complete flap loss, a salvage procedure is performed. In the present study, the effectiveness of intra-arterial urokinase infusion through the free flap tissue was investigated to develop a protocol to prevent thrombotic failure. The retrospective study evaluated the medical records of patients who underwent salvage procedure with intra-arterial urokinase infusion after reconstruction with free flap transfer between January 2013 and July 2019. Thrombolysis with urokinase infusion was administered as salvage treatment for patients who experienced flap compromise more than 24 hours after free flap surgery. Because of an external venous drainage through the resected vein, 100,000 IU of urokinase was infused into the arterial pedicle only into the flap circulation. A total of 16 patients was included in the present study. The mean time to re-exploration was 45.4 hours (range: 24-88 hours), and the mean quantity of infused urokinase was 69,688 IU (range: 30,000-100,000 IU). 5 cases presented with both arterial and venous thrombosis, while 10 cases had only venous thrombosis and 1 case had only arterial thrombosis; in a study of 16 patients undergoing flap surgery, 11 flaps were found to have survived completely, while 2 flaps experienced transient partial necrosis and 3 were lost despite salvage efforts. In other word, 81.3% (13 of 16) of flaps survived. Systemic complications, including gastrointestinal bleeding, hematemesis, and hemorrhagic stroke, were not observed. The free flap can be effectively and safely salvaged without systemic hemorrhagic complications using high-dose intra-arterial urokinase infusion within a short period of time without systemic circulation, even in delayed salvage cases. Urokinase infusion results in successful salvage and low rate of fat necrosis.

Tissue Transfer After Tongue Resection: Micro-Vascular Reconstruction Using Radial Artery Free Flap versus Reconstruction by Split Thickness Skin Graft in T2 Lesions of Tongue Carcinoma

To compare postoperative complications, functional rehabilitation, surgical outcomes of the radial artery forearm free flap (RAFFF) and split thickness skin graft (STSG) reconstruction of postsurgical defect in T2 lesions of cancer oral cavity. Observational Prospective comparative study. Academic tertiary referral centre. In our study of forty four patients, after tumour resection, half underwent reconstruction using RAFFF (Group I) and another half by STSG (Group II). All of the patients were followed postoperatively to determine and compare their functional outcomes related to donor site and recipient site complications, speech, deglutition and mouth opening. The speech intelligibility and deglutition were each assessed using Articulation Handicap Index and Vedio-fluoroscopy using the Functional oral intake scale. Operative time for STSG reconstruction was shorter at 2.2 ± 0.97 SD hours compared to 5.9 ± 1.24 SD hours for RAFFF reconstruction. Hospital stay was 8.3 ± 1.19 SD days for STSG patients and 12.6 ± 1.7 SD days for RAFFF patients. The functional outcomes of speech quality and swallowing were near comparable in both groups but the donor site complications were significant in the RAFFF group. Operative time, hospital stay and donor site complications are both significantly reduced with the STSG as opposed to RAFF. Functional and oncologic results of both methods are near comparable. To conclude, STSG can be used for reconstruction of the post-surgical defects in T2 lesions of the tongue.

Risk factors associated with postoperative complications following free flap reconstruction of head and neck defects

BACKGROUND

Free flap reconstruction of head and neck defects is routinely performed with a high success rate nowadays. However, postoperative complications are still commonly observed. The aim of this study is to investigate risk factors correlated with postoperative complications following free flap reconstruction of head and neck defects.

METHODS

A retrospective study of all patients undergoing free flap reconstruction of head and neck defects between January 2018 and January 2020 at Sun Yat-sen Memorial Hospita, Guangzhou, China was performed. Preoperative, intraoperative, and postoperative data were collected retrospectively. The primary outcome variables were postoperative complications, which were divided into medical and surgical complications. All patients were grouped by either complications or no complications. Univariate and multivariate logistic regression models were used to identify risk factors predicting complications.

RESULTS

850 patients underwent free flap reconstruction of head and neck defects during the study period (Male: 65.29%; Mean [SD] age: 54.90 [13.78] years). Postoperative complications developed in 125 (14.71%) patients, among which, 101 (11.88%) patients developed surgical complications, 29 (3.41%) patients developed medical complications and 5 (0.59%) patients developed both surgical and medical complications. Total flap necrosis was observed in 11 (1.29%) patients. After multivariate analysis, several risk factors incluing postoperative ICU admission, coronary heart disease, post radiotherapy surgery and flap types were identified correlated with postoperative complications.

CONCLUSIONS

Our study identified related variables for a higher risk of postoperative complications development following free flap reconstruction of head and neck defects. Early detection of these risk factors will improve prognosis.

Perioperative Outcomes in Patients Who Underwent Fibula, Osteocutaneous Radial Forearm, and Scapula Free Flaps: A Multicenter Study

Importance

Studies comparing perioperative outcomes of fibula free flaps (FFFs), osteocutaneous radial forearm free flaps (OCRFFFs), and scapula free flaps (SFFs) have been limited by insufficient sample size.

Objective

To compare the perioperative outcomes of patients who underwent FFFs, OCRFFFs, and SFFs.

Design, Setting, and Participants

This cohort study assessed the outcomes of 1022 patients who underwent FFFs, OCRFFFs, or SFFs for head and neck reconstruction performed at 1 of 6 academic medical centers between January 2005 and December 2019. Data were analyzed from September 17, 2021, to June 9, 2022.

Main Outcomes and Measures

Patients were stratified based on the flap performed. Evaluated perioperative outcomes included complications (overall acute wound complications, acute surgical site infection [SSI], fistula, hematoma, and flap failure), 30-day readmissions, operative time, and prolonged hospital length of stay (75th percentile, >13 days). Patients were excluded if data on flap type or clinical demographic characteristics were missing. Associations between flap type and perioperative outcomes were analyzed using logistic regression, after controlling for other clinically relevant variables. Adjusted odds ratios (aORs) with 95% CIs were generated.

Results

Perioperative outcomes of 1022 patients (mean [SD] age, 60.7 [14.5] years; 676 [66.1%] men) who underwent major osseous head and neck reconstruction were analyzed; 510 FFFs (49.9%), 376 OCRFFFs (36.8%), and 136 SFFs (13.3%) were performed. Median (IQR) operative time differed among flap types (OCRFFF, 527 [467-591] minutes; FFF, 592 [507-714] minutes; SFF, 691 [610-816] minutes). When controlling for SSI, FFFs (aOR, 2.47; 95% CI, 1.36-4.51) and SFFs (aOR, 2.95; 95% CI, 1.37-6.34) were associated with a higher risk of flap loss than OCRFFFs. Compared with OCRFFFs, FFFs (aOR, 1.77; 95% CI, 1.07-2.91) were associated with a greater risk of fistula after controlling for the number of bone segments and SSI. Both FFFs (aOR, 1.77; 95% CI, 1.27-2.46) and SFFs (aOR, 1.68; 95% CI, 1.05-2.69) were associated with an increased risk of 30-day readmission compared with OCRFFFs after controlling for Charlson-Deyo comorbidity score and acute wound complications. Compared with OCRFFFs, FFFs (aOR, 1.78; 95% CI, 1.25-2.54) and SFFs (aOR, 1.96; 95% CI, 1.22-3.13) were associated with a higher risk of prolonged hospital length of stay after controlling for age and flap loss.

Conclusions and Relevance

Findings of this cohort study suggest that perioperative outcomes associated with OCRFFFs compare favorably with those of FFFs and SFFs, with shorter operative times and lower rates of flap loss, 30-day readmissions, and prolonged hospital length of stay. However, patients undergoing SFFs represented a more medically and surgically complex population than those undergoing OCRFFFs or FFFs.

Pedicle First Anterior Approach to Harvest Anterolateral Thigh Flap—Review of 304 Cases

Background  Although considered as a workhorse flap, the anterolateral thigh (ALT) flap has a steep learning curve that makes it difficult for microsurgeons to perform it early in their practice. In over 85% of patients, the perforator takes an intramuscular course making it difficult for beginners to safely secure the perforator dissection. In this technique, the pedicle is dissected first, utilizing the proximal incision by palpating the groove in between vastus lateralis and rectus femoris on the anterior aspect and extending the incision from 2 to 3 cm distal to the inguinal ligament to the flap markings caudally. Exposing the pedicle first makes it easier to proceed toward the skin perforator due to its easy identification and larger size at its origin.

Patients and Methods  This retrospective study was conducted from 2005 to 2020 in which 304 ALT flaps were performed by the pedicle first technique. Flap harvest time, incidence of injury to the skin perforator during harvest, flap re-exploration rates, and postoperative complications including incidence of flap necrosis, infection, and bleeding were the parameters that were measured.

Results  This study included a total of 304 patients of which 220 were male (72.3%). The average flap harvest time was 26 ± 3.2 minutes. Adverse events included perforator injury ( n  = 1), flap re-exploration ( n  = 15), and complete flap loss ( n  = 8). The last eight patients were reconstructed secondarily with ALT flap from the opposite side and free latissimus dorsi flap ( n  = 2).

Conclusion  The pedicle first technique makes ALT flap harvest easy, safe, and faster for plastic surgeons. The chances of injury to the skin perforator are markedly less thereby reducing postoperative complications.

Effect of Total Intravenous Anesthesia on Postoperative Pulmonary Complications in Patients Undergoing Microvascular Reconstruction for Head and Neck Cancer: A Randomized Clinical Trial

Importance

Free flap surgery is a lengthy procedure with massive tissue destruction and reconstruction, which makes postoperative pulmonary complications (PPCs) a noticeable issue among patients with head and neck cancer. Propofol-based total intravenous anesthesia (TIVA) has better survival outcomes than inhalational anesthesia (INH) in several types of cancer surgery. A previous retrospective study found that patients in the TIVA group had a lower PPC rate, which may be correlated with a lower intraoperative fluid requirement. We hypothesize that the protective effect remains among patients undergoing free flap surgery for head and neck cancer in a prospective and goal-directed fluid therapy setting.

Objective

To assess the effect of TIVA vs INH on PPCs in patients undergoing microvascular reconstruction for head and neck cancer.

Design, Setting, and Participants

This prospective, 2-arm, randomized clinical trial was conducted at a tertiary hospital in Taiwan; a total of 78 patients 18 years and older with American Society of Anesthesiologists physical status classification 1 to 3 who were scheduled for elective free flap surgery under general anesthesia were included. The trial started in October 2017, completed in October 2019, and finished analysis in January 2022.

Interventions

Patients were enrolled and randomized to the TIVA or INH group. All patients received goal-directed fluid therapy and hemodynamic management if they had a mean arterial pressure (MAP) below 75 mm Hg or a reduction of 10% from baseline MAP.

Main Outcomes and Measures

The primary outcome was a composite of PPCs. The secondary outcomes were the differences in intraoperative hemodynamic values (mean arterial pressure, MAP; cardiac index, CI; systemic vascular resistance index, SVRI; and stroke volume variation, SVV).

Results

A total of 70 patients (65 men [93%]; 5 women [7%]) completed the trial; median (IQR) age was 52.0 (48-59) years in the TIVA group and 57.0 (46-64) years in the INH group. The demographic characteristics were similar between the 2 groups, except that patients in the TIVA group had a slightly lower body mass index. Patients in the TIVA group had a lower risk of developing PPCs (unadjusted odds ratio, 0.25; 95% CI, 0.08-0.80). The TIVA group had significantly higher MAP, lower CI, and higher SVRI than the INH group after the third hour of monitoring. The TIVA group showed a relatively stable hourly MAP, CI, SVRI, and SVV across time points, while the INH group showed a more varying pattern. The generalized estimating equation showed no clinical differences in the trend of hemodynamic parameters across time between groups.

Conclusions and Relevance

In this randomized clinical trial, using propofol-based TIVA reduced the incidence of PPCs in free flap surgery. This finding may be related to more stable hemodynamic manifestations and a lower total balance of fluid throughout the surgery.

Trial Registration

ClinicalTrials.gov Identifier: NCT03263078.

Clair J. Jaw-in-a-Riley-Day: Mandibular Free Flap Reconstruction With Virtual Surgical Planning in a Patient With Familial Dysautonomia

We present a unique case of mandibular reconstruction using virtual surgical planning (VSP) of a post-traumatic mandibular non-union defect for a patient with familial dysautonomia (FD), also known as Riley-Day Syndrome. In this case, the complexity related to perioperative and surgical challenges illustrates the utility of VSP and the importance of multi-disciplinary collaboration in jaw-free flap reconstructive surgery. We highlight our experience with the “Jaw-In-A-Day” approach in conjunction with tailored preoperative planning and perioperative care resulting in successful mandibular free flap reconstruction.

Using the DASH Questionnaire to Evaluate Donor Site Morbidity of the Serratus Anterior Free Flap in Head and Neck Reconstruction: A Multicenter Study

Objective: To evaluate donor site morbidity of the serratus anterior free flap (SAFF) in head and neck reconstruction. Methods: The Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire (0 no disability to 100 most severe disability) was applied to 20 patients (M: 16; F: 4) who underwent ablative surgery and reconstruction of the head and neck using a SAFF. Applications, as well as the donor site, recipient site and flap-related complications, were evaluated. Results: SAFF was mainly used for tongue (n = 11; 55.0%) and pharyngeal reconstruction after a laryngopharyngectomy (n = 4; 20.0%). The majority of patients presented with stage IV disease (n = 12; 60%) and had undergone previous radiotherapy (n = 14; 70%). Our free flap survival rate was 88.9% and the pectoralis major muscle flap (PMMF) was used in 5 patients as a salvage option to reconstruct pharyngeal defects. The mean/median DASH score was 21.6/19.9 (healthy norm 10.1), indicating only mild to moderate disability. However, free flap failure and the additional harvest of PMMF multiplies donor site morbidity since it was associated with a 3- and 2.6-times higher DASH score (46.0 vs. 15.5; p = 0.039 and 39.9 vs. 15.47; p = 0.081). Conclusions: The SAFF represents a versatile flap for head and neck reconstruction with low donor site morbidity.

Outcome Analysis of Advanced Oral Cancers Requiring Large Composite Fibular Osteocutaneous Flap Reconstruction: Experience From a Tertiary Care Cancer Hospital

BACKGROUND

Advanced oral cancer entailing extensive resection of large parts of the mucosa, bone, and skin require reconstructions with composite free flaps. Our aim was to analyze the outcomes of those oral squamous cell carcinomas requiring fibular osteocutaneous free flaps with large skin defects.

METHODS

Perioperative course and histopathological and survival outcomes of 246 consecutive patients warranting composite fibular flaps from January 2010 to June 2015 at Tata Memorial Hospital, Mumbai, India, were retrospectively analyzed.

RESULTS

Despite majority of T4 disease (88.2%) and stage IV disease (92%) patients, the 5-year overall survival was 52.1% and the 5-year recurrence-free survival was 48.6% with a median follow-up of 42 months with minimal complications.

CONCLUSIONS

Reconstruction with composite fibular osteocutaneous flaps has comparable outcomes of survival with acceptable complications in mega oral squamous cell carcinomas requiring extensive resection.

Moving to a more restrictive transfusion protocol: Outcomes in head and neck free flap surgery

PURPOSE

To determine if a more restrictive transfusion protocol results in increased rates of adverse flap outcomes in patients undergoing free tissue transfer.

MATERIALS AND METHODS

Mixed retrospective and prospective cohort study. Patients who underwent surgery before the protocol change were collected retrospectively. Patients who underwent surgery after the protocol change were collected prospectively.

RESULTS

Of the 460 patients who underwent free tissue transfer, 116 patients in the pre-change cohort (N = 211) underwent transfusion (54.98%) and 78 in the post-change cohort(N = 249) (31.33%) (p < 0.001). The mean number of units transfused was 1.55 + 2.00 in the pre-change cohort, and 0.78 + 1.51 in the post-change cohort (p < 0.001). When separated temporally, the pre-change cohort received significantly more blood transfusions than the post-change cohort in the operating room (33.65% vs 18.07%) (p < 0.01), within 72 h of surgery (35.55% vs 15.66%) (p < 0.001), and after 72 h after surgery to discharge (16.59% vs 8.03%) (p = 0.018017). The rate of flap failure was 6.70% in the pre-change cohort, and 5.31% in the post-change cohort (p = 0.67). In a logistic regression model controlling for potential confounders, transfusion protocol was not significantly associated with flap failure (OR = 1.1080, 95% CI: 0.48-2.54). There were no significant differences between cohorts for medical morbidity, ICU transfer, or death.

CONCLUSION

Our data support the conclusion that patients undergoing free tissue transfer to the head and neck can be transfused following the same protocols as other patients, without increasing the rate of flap failure or other morbidities.

LEVEL OF EVIDENCE

3 (mixed retrospective, prospective cohort study).

Proposed Prediction Model and Nomogram for Systemic Complications in Patients Undergoing Free Flap Head and Neck Reconstruction

Postoperative complications in head and neck surgery are well-known, but a predictive model to guide clinicians in free flap reconstructions has not been established. This retrospective single-center observational study assessed 131 patients who underwent ablative surgery and received free flap reconstruction. Primary endpoint was the occurrence of systemic complications (PSC). Secondary endpoint was the generation of a nomogram of complications according to the CDC classification. In the ordinal regression model, postoperative administration of furosemide [1.36 (0.63–2.11), p < 0.0001], blood loss [0.001 (0.0004–0.0020), p = 0.004], postoperative nadir hemoglobin [−0.03 (−0.07–0.01), p = 0.108], smoking [0.72 (0.02–1.44), p = 0.043], and type of flap reconstruction [1.01 (0.21–1.84), p = 0.014] as predictors. A nomogram with acceptable discrimination was proposed (Somer's delta: 0.52). Application of this nomogram in clinical practice could help identify potentially modifiable risk factors and thus reduce the incidence of postoperative complications in patients undergoing microvascular reconstruction of the head and neck.

Surgical Free Flaps and Grafts in Head and Neck Reconstruction: Principles and Postoperative Imaging

This review article discusses the basic principles behind the use of flaps and grafts for reconstructive surgery in the head and neck, with a special emphasis on the types of commonly used free flaps, their imaging appearance as well as some frequently encountered postoperative complications. Given the ubiquity and complexity of these reconstructive techniques, it is essential that head and neck radiologists be familiar in distinguishing between the expected evolving findings, complications, and tumor recurrence.

Safe Free Tissue Transfer in Patients Older than 90 Years

Objective This study aimed to evaluate the safety of microvascular free tissue transfer in the elderly patient population.

Methods We performed a 20-year retrospective review at a tertiary care private practice of patients of ≥ 90 years of age who underwent microvascular free tissue transfer and had at least 6 months of follow-up. Similarly, we reviewed patients aged 70 to 89 years who underwent free tissue transfer between 2018 and 2020 as a control group. Records were examined for type of flap, defect site, pathology, and occurrence of complications.

Results Overall 77 patients of 90 years or older met the inclusion criteria and 77 sequential patients aged 70 to 89 years were identified to serve as a control group. The overall complication rate among patients of ≥ 90 years of age was 18%, with flap-related complications in 4% (two partial flap loss and one total loss). The mortality rate was 1.3%. All patients of ≥ 90 years of age undergoing osteocutaneous reconstruction for osteoradionecrosis experienced complications, but only one was a flap complication (partial loss). Among patients aged 70 to 89 years, the overall complication rate was also 18%, with flap-related complications in 4% (two complete flap failures and one partial loss). The mortality rate in the control group was 2.6%.

Conclusion Soft tissue free flaps are a safe option in the elderly patient population and should be offered to patients who are medically optimized prior to surgery, regardless of age. Osteocutaneous reconstruction for osteoradionecrosis must be undertaken with caution. This study reflects level of evidence 4.

The Utility of Comorbidity Indices in Assessing Head and Neck Surgery Outcomes: A Systematic Review

OBJECTIVE

To evaluate the utility of comorbidity index (CI) scores in predicting outcomes in head and neck surgery (HNS). The CIs evaluated were the Charlson Comorbidity Index (CCI), Elixhauser Comorbidity Index (ECI), Kaplan-Feinstein Index (KFI), American Society of Anesthesiologists Physical Status (ASA-PS), Adult Comorbidity Evaluation-27 (ACE-27), National Cancer Institute Comorbidity Index (NCI-CI), and the Washington University Head and Neck Comorbidity Index (WUHNCI).

METHODS

We report a systematic review according to the 2009 Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Electronic databases (PubMed, Cochrane, and Embase) and manual search of bibliographies identified manuscripts addressing how CI scores related to HNS outcomes.

RESULTS

A total of 116 studies associated CI scores with HNS outcomes. CIs were represented in the literature as follows: ASA-PS (70/116), CCI (39/116), ACE-27 (24/116), KFI (7/116), NCI-CI (3/116), ECI (2/116), and WUHNCI (1/116). The most frequently cited justification for calculating each CI (if provided) was: CCI for its validation in other studies, ACE-27 for its utility in cancer patients, and ECI for its comprehensive design. In general, the CCI and ACE-27 were predictive of mortality in HNS. The ECI was most consistent in predicting >1-year mortality. The ACE-27 and KFI were most consistent in predicting medical complications.

CONCLUSION

Despite inconsistencies in the literature, CIs provide insights into the impact of comorbidities on outcomes in HNS. These scores should be employed as an adjunct in the preoperative assessment of HNS patients. Comparative studies are needed to identify indices that are most reliable in predicting HNS outcomes.

LEVEL OF EVIDENCE

NA Laryngoscope, 2021.

Enhanced Recovery Pathways for Flap-Based Reconstruction: Systematic Review and Meta-Analysis

BACKGROUND

Enhanced Recovery After Surgery (ERAS) pathways are known to improve patient outcomes after surgery. In recent years, there have been growing interest in ERAS for reconstructive surgery.

OBJECTIVES

To systematically review and summarise literature on the key components and outcomes of ERAS pathways for autologous flap-based reconstruction.

DATA SOURCES

Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, Current Controlled Trials, World Health Organization International Clinical Trials Registry Platform and reference lists of relevant studies.

INCLUSION CRITERIA

All primary studies of ERAS pathways for free and pedicled flap-based reconstructions reported in the English language.

OUTCOME MEASURES

The primary outcome measure was length of stay. Secondary outcomes were complication rates including total flap loss, partial flap loss, unplanned reoperation within 30 days, readmission to hospital within 30 days, surgical site infections and medical complications.

RESULTS

Sixteen studies were included. Eleven studies describe ERAS pathways for autologous breast reconstructions and five for autologous head and neck reconstructions. Length of stay was lower in ERAS groups compared to control groups (mean reduction, 1.57 days; 95% CI, - 2.15 to - 0.99). Total flap loss, partial flap loss, unplanned reoperations, readmissions, surgical site infections and medical complication rates were similar between both groups. Compliance rates were poorly reported.

CONCLUSION

ERAS pathways for flap-based reconstruction reduce length of stay without increasing complication rates. ERAS pathways should be adapted to each institution according to their needs, resources and caseload. There is potential for the development of ERAS pathways for chest wall, perineum and lower limb reconstruction.

LEVEL OF EVIDENCE III

This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

Expert Consensus Statement on the Perioperative Management of Adult Patients Undergoing Head and Neck Surgery and Free Tissue Reconstruction From the Society for Head and Neck Anesthesia

The perioperative care of adult patients undergoing free tissue transfer during head and neck surgical (microvascular) reconstruction is inconsistent across practitioners and institutions. The executive board of the Society for Head and Neck Anesthesia (SHANA) nominated specialized anesthesiologists and head and neck surgeons to an expert group, to develop expert consensus statements. The group conducted an extensive review of the literature to identify evidence and gaps and to prioritize quality improvement opportunities. This report of expert consensus statements aims to improve and standardize perioperative care in this setting. The Modified Delphi method was used to evaluate the degree of agreement with draft consensus statements. Additional discussion and collaboration was performed via video conference and electronic communication to refine expert opinions and to achieve consensus on key statements. Thirty-one statements were initially formulated, 14 statements met criteria for consensus, 9 were near consensus, and 8 did not reach criteria for consensus. The expert statements reaching consensus described considerations for preoperative assessment and optimization, airway management, perioperative monitoring, fluid management, blood management, tracheal extubation, and postoperative care. This group also examined the role for vasopressors, communication, and other quality improvement efforts. This report provides the priorities and perspectives of a group of clinical experts to help guide perioperative care and provides actionable guidance for and opportunities for improvement in the care of patients undergoing free tissue transfer for head and neck reconstruction. The lack of consensus for some areas likely reflects differing clinical experiences and a limited available evidence base.

A retrospective study on mandibular reconstruction using iliac crest free flap

PURPOSE

To assess the availability, success rate and complications of microvascular iliac crest free flap for reconstruction of mandibular segmental defects.

METHODS

In this retrospective-descriptive study, we report patients who had undergone segmental mandibular resection for pathologic lesions and received reconstruction with iliac crest microvascular free flap between 2016 and 2019. Clinical and demographic data of all the cases were collected. Success was regarded as complete consolidation of the bone graft in panoramic radiograph. Postoperative complications were defined as major or minor based on the need for intervention. T-test, Kolomogorov_Smirnov, and multivariate analysis were used and the p-value<0.05 was considered to be statistically significant.

RESULTS

Of all 30 patients, 16 were women and 14 were men with an average age of 27.2 years (range 14-40). Patients were followed for 12-60 month (mean: 38.4). One flap was lost due to unsalvageable venous thrombosis. Six other cases had post-op complications while smoking and diabetes were associated with more complications (P = 0.036). Twenty-three patients received primary reconstruction which was more successful than secondary ones (P = 0.003). Osteogenic sarcoma was associated with greater risk of complications (P < 0.01).

CONCLUSIONS

The results of this study suggest that iliac crest microvascular free flap serves as a promising option for the reconstruction of mandibular defects, providing excellent contour and acceptable success rate with low donor site morbidity. Future studies will focus on the role of systemic diseases in post-op complications and flap failures.

Impact of Goal Directed Therapy in Head and Neck Oncological Surgery with Microsurgical Reconstruction: Free Flap Viability and Complications

Simple Summary

Based on the proven benefits of goal directed therapy (GDT) in the perioperative management of different surgical procedures and in high-risk patients, we hypothesised that this approach would also be beneficial in microvascular free flap reconstruction in head and neck cancer. In this study, we investigated whether GDT would directly benefit flap viability in addition to improving morbidity and mortality. As this reconstructive technique is gradually being introduced in more specialist fields, particularly radical oncological surgery, the benefits of GDT in this context could be extended to numerous procedures.

Abstract

(1) Background: Surgical outcomes in free flap reconstruction of head and neck defects in cancer patients have improved steadily in recent years; however, correct anaesthesia management is also important. The aim of this study has been to show whether goal directed therapy can improve flap viability and morbidity and mortality in surgical patients. (2) Methods: we performed an observational case control study to analyse the impact of introducing a semi invasive device (Flo Trac^®) during anaesthesia management to optimize fluid management. Patients were divided into two groups: one received goal directed therapy (GDT group) and the other conventional fluid management (CFM group). Our objective was to compare surgical outcomes, complications, fluid management, and length of stay between groups. (3) Results: We recruited 140 patients. There were no differences between groups in terms of demographic data. Statistically significant differences were observed in colloid infusion (GDT 53.1% vs. CFM 74.1%, p = 0.023) and also in intraoperative and postoperative infusion of crystalloids (CFM 5.72 (4.2, 6.98) vs. GDT 3.04 (2.29, 4.11), p < 0.001), which reached statistical significance. Vasopressor infusion in the operating room (CFM 25.5% vs. GDT 74.5%, p < 0.001) and during the first postoperative 24h (CFM 40.6% vs. GDT 75%, p > 0.001) also differed. Differences were also found in length of stay in the intensive care unit (hours: CFM 58.5 (40, 110) vs. GDT 40.5 (36, 64.5), p = 0.005) and in the hospital (days: CFM 15.5 (12, 26) vs. GDT 12 (10, 19), p = 0.009). We found differences in free flap necrosis rate (CMF 37.1% vs. GDT 13.6%, p = 0.003). One-year survival did not differ between groups (CFM 95.6% vs. GDT 86.8%, p = 0.08). (4) Conclusions: Goal directed therapy in oncological head and neck surgery improves outcomes in free flap reconstruction and also reduces length of stay in the hospital and intensive care unit, with their corresponding costs. It also appears to reduce morbidity, although these differences were not significant. Our results have shown that optimizing intraoperative fluid therapy improves postoperative morbidity and mortality.

Perioperative predictors of early surgical revision and flap-related complications after microvascular free tissue transfer in head and neck reconstructions: a retrospective observational series

Objectives

The aim of this study was to determine the influence of perioperative fluid management and administration of vasopressors on early surgical revision and flap-related complications in free tissue transfer.

Materials and methods

Intraoperative amount of fluid and of vasopressors, relevant perioperative parameters, and comorbidities were recorded in 131 patients undergoing head and neck microvascular reconstruction and compared with early surgical complications, defined as interventions requiring surgery after a flap-related complication, and/or other surgical problems in the operating room within 30 days after initial surgery. The relationship between perioperative variables for each revision category was determined using an optimized multiple logistic regression.

Results

The administration of diuretics (p=0.001) as a treatment for perioperative fluid overload and the type of flap (p=0.019) was associated with a higher risk of early surgical revisions. Perioperative fluid overload (p=0.039) is significantly related to flap-related complications. We found no effect of intraoperative administration of vasopressors on early surgical revisions (p=0.8) or on flap-related complications (norepinephrine p=0.6, dobutamine p=0.5).

Conclusion

Perioperative fluid overload is associated with higher risks of early surgical revision and flap-related complications. In contrast, the administration of vasopressors seemed to have no effect on either surgical revision rate or flap-related complications.

Clinical relevance

In patients receiving microvascular reconstructions, a balanced fluid administration perioperatively and a targeted use of vasopressors should be the necessary strategy to reduce the complication rates in head and neck surgery.

Goal-directed fluid therapy in autologous breast reconstruction results in less fluid and more vasopressor administration without outcome compromise

OBJECTIVE

Aggressive or restricted perioperative fluid management has been shown to increase complications in patients undergoing microsurgery. Goal-directed fluid therapy (GDFT) aims to administer fluid, vasoactive agents, and inotropes according to each patient's hemodynamic indices. This study assesses GDFT impact on perioperative outcomes of autologous breast reconstruction (ABR) patients, as there remains a gap in management understanding. We hypothesize that GDFT will have lower fluid administration and equivocal outcomes compared to patients not on GDFT.

METHODS

A single-center retrospective review was conducted on ABR patients from January 2010-April 2017. An enhanced recovery after surgery (ERAS) using GDFT was implemented in April 2015. With GDFT, patients were administered intraoperative fluids and vasoactive agents according to hemodynamic indices. Patients prior to April 2015 were included in the pre-ERAS cohort. Primary outcomes included the amount and rate of fluid delivery, urine output (UOP), vasopressor administration, major (i.e., flap failure) and minor (i.e., seroma) complications, and length of stay (LOS).

RESULTS

Overall, 777 patients underwent ABR (ERAS: 312 and pre-ERAS: 465). ERAS patients received significantly less total fluid volume (ERAS median: 3750 mL [IQR: 3000-4500 mL]; pre-ERAS median: 5000 mL [IQR 4000-6400 mL]; and p<0.001), had lower UOP, were more likely to receive vasopressor agents (47% vs 35% and p<0.001), and had lower LOS (ERAS: 4 days [4-5]; pre-ERAS: 5 [4-6]; and p<0.001) as compared to pre-ERAS patients. Complications did not differ between cohorts.

CONCLUSIONS

GDFT, as part of ERAS, and the prudent use of vasopressors were found to be safe and did not increase morbidity in ABR patients. GDFT provides individualized perioperative care to the ABR patient.

Bioelectrical Impedance Analysis in Patients Undergoing Major Head and Neck Surgery: A Prospective Observational Pilot Study

Background: Head and neck patients are prone to malnutrition. Perioperative fluids administration in this patient group may influence nutritional status. We aimed to investigate perioperative changes in patients undergoing major head and neck surgery and to examine the impact of perioperative fluid administration on body composition and metabolic changes using bioelectrical impedance. Furthermore, we sought to correlate these metabolic changes with postoperative complication rate. In this prospective observational pilot study, bioelectrical impedance analysis (BIA) was performed preoperatively and on postoperative days (POD) 2 and 10 on patients who underwent major head and neck surgeries. BIA was completed in 34/37 patients; mean total intraoperative and post-anesthesia fluid administration was 3682 ± 1910 mL and 1802 ± 1466 mL, respectively. Total perioperative fluid administration was associated with postoperative high extra-cellular water percentages (p = 0.038) and a low phase-angle score (p < 0.005), which indicates low nutritional status. Patients with phase angle below the 5th percentile at POD 2 had higher local complication rates (p = 0.035) and longer hospital length of stay (LOS) (p = 0.029). Multivariate analysis failed to demonstrate that high-volume fluid administration and phase angle are independent factors for postoperative complications. High-volume perioperative fluids administration impacts postoperative nutritional status with fluid shift toward the extra-cellular space and is associated with factors that increase the risk of postoperative complications and longer LOS. An adjusted, low-volume perioperative fluid regimen should be considered in patients with comorbidities in order to minimize postoperative morbidity.

Ultradelayed Arterial Thrombosis: Critical Flap Ischemia After Phalloplasty

BACKGROUND AND OBJECTIVES

Delayed arterial thrombus causing loss of a cutaneous free flap at or beyond 6 months is a rare phenomenon. The purpose of this report is to describe 2 cases of arterial compromise requiring medical and surgical intervention at or beyond 6 months after radial forearm free flap (RFFF) phalloplasty and to define the phenomenon of ultradelayed arterial thrombosis.

METHODS

Patient 1 is a 44-year-old transmale who presented with pulselessness, pallor, and hypersensitivity of his neophallus 10 years status post-RFFF phalloplasty using a saphenous vein interposition graft (SVIG) between the superficial femoral artery (SFA) and radial artery (RA). Patient 2 is a 35-year-old transmale who presented with similar complaints 6 months status post-RFFF phalloplasty with the same vascular connections as above.

RESULTS

Patient 1 was found to have an arterial thrombus distal to the SFA-SVIG anastomosis requiring catheter-directed thrombolysis with tissue plasminogen activator, resulting in partial loss limited to the distal three fourths of the shaft. Patient 2 was also found to have an arterial thrombus distal to the SFA-SVIG anastomosis requiring catheter-directed thrombolysis with tissue plasminogen activator and common femoral artery CFA-RA bypass, resulting in partial loss limited to the neoglans.

CONCLUSIONS

Ultradelayed arterial thrombosis is a rare phenomenon requiring urgent intervention. The exact causes of this phenomenon, whether mechanical or physiological or both, have yet to be fully elucidated but it is hypothesized that the original anastomosis may continue to serve as the critical blood supply to its flap as far as 10 years after surgery.

Anaesthetic implications of free-flap microvascular surgery for head and neck malignancies – A relook

Head and neck free-flap microvascular surgery is a type of surgery where multiple anaesthetic factors play a very important role in the outcome of the surgery while the conduct of anaesthesia itself may be quite challenging for the anaesthesiologist. In microvascular reconstruction of head and neck malignancies, flaps are used to reconstruct a primary defect formed by wide local excision. A free flap is raised after removing the neurovascular pedicle from the donor site and transplanting it by microvascular anastomosis to the new location. This gives rise to a secondary defect which is then repaired by direct suture or skin graft. The anaesthesiologist’s role includes optimizing the physiological conditions for the survival of the flap while decreasing morbidity at the same time. Failure of the free flap is attributed to numerous causes. This is an attempt to highlight them along with discussion of the anaesthesia-related issues that are faced during this type of surgery. The various pre-, intra- and postoperative factors affecting flap survival and overall postoperative outcome in the patient are discussed here.