Perceived Success in Upper-Extremity Vascularized Composite Allotransplantation: A Qualitative Study

Establishing an upper extremity transplantation program: lessons learnt over 12 years

PURPOSE OF REVIEW

As one of the early hand transplant programs in the world, we are often asked to educate other programs on the lessons we have learned and on how to set up a successful hand transplantation program.

RECENT FINDINGS

Two decades of global experience with vascularized composite allotransplantation (VCA) of the upper limb have demonstrated improved functional outcomes and quality of life for carefully screened patients. Despite initial reticence about VCA, over 30 patients in the USA have benefited from hand transplantation, with around 80% long-term successes. We have experience with four bilateral upper extremity patients who have undergone bilateral upper extremity allotransplants. This review article highlights our personal experience and lessons with respect to VCA team assembly, logistics, patient selection, perioperative planning, the operative procedure, and postoperative management.

SUMMARY

Continual learning and critical evaluation are crucial to maintaining a successful upper extremity VCA program. This will ensure that patients who stand to benefit most from this life-enhancing procedure are identified and are others optimized to achieve the best possible outcomes.

Sub-zero non-freezing of vascularized composite allografts in a rodent partial hindlimb model

Ischemia is a major limiting factor in Vascularized Composite Allotransplantation (VCA) as irreversible muscular injury can occur after as early as 4-6 h of static cold storage (SCS). Organ preservation technologies have led to the development of storage protocols extending rat liver ex vivo preservation up to 4 days. Development of such a protocol for VCAs has the added challenge of inherent ice nucleating factors of the graft, therefore, this study focused on developing a robust protocol for VCA supercooling. Rodent partial hindlimbs underwent subnormothermic machine perfusion (SNMP) with several loading solutions, followed by a storage solution with cryoprotective agents (CPA) developed for VCAs. Storage occurred in suspended animation for 24h and VCAs were recovered using SNMP with modified Steen. This study shows a robust VCA supercooling preservation protocol in a rodent model. Further optimization is expected to allow for its application in a transplantation model, which would be a breakthrough in the field of VCA preservation.

Advancing vascularized composite allotransplantation: essential factors for upper extremity transplant program development

Vascularized Composite Allotransplantation (VCA) offers a unique option to restore form and function after limb loss or facial trauma that cannot be satisfactorily accomplished through traditional prosthetics or reconstructions. Establishing a successful Upper Extremity Transplantation (UET) program requires strong leadership and a structured surgical team, and extensive interdisciplinary collaboration. We conducted a qualitative study among 12 health care professionals and patients. Informed consent was obtained per protocol, and semi-structured interviews were conducted online and recorded. Participants reported their perceptions of factors that either favored or hindered a successful outcome, including functional status before and after surgery, preparation for transplant, shared decision-making, rehabilitation, and psychosocial support. Thematic analysis revealed that it is essential to establish a team comprising various disciplines well before performing VCA procedures. Defining a common goal and choosing a defined leader is a key factor in procedural success and requires open collaboration beyond what is typical. Primary described categories are interdisciplinary collaboration and skills of the VCA team, building and leading a VCA team, pre-transplant procedures, post-transplant course, and factors to consider when establishing a program. The basic roles of team science play an outsized role in establishing a VCA program. Transplantation medicine involves various overlapping scientific and medical categories requiring health professionals to consciously work together to establish complex vertical and horizontal communication webs between teams to obtain positive outcomes. In addition to medical considerations, patient-specific factors such as transparent communication, therapy plan establishment, plan adherence, and continual follow-up are significant factors to overall success.

The Nuances of Hand Transplantation After Sepsis

Vascularized composite allotransplantation (VCA) of the upper extremity is an established restorative procedure for selected patients with acquired upper limb loss. The majority of upper limb VCAs performed worldwide have been for victims of various forms of trauma. However, in the developed world, amputation following severe sepsis seems to be an increasingly common indication for referral to hand transplant programs. Unlike trauma patients with isolated limb injuries, patients with amputations as a complication of sepsis have survived through a state of global tissue hypoperfusion and multisystem organ failure with severe, enduring effects on the entire body's physiology. This article reviews the unique considerations for VCA candidacy in postsepsis patients with upper limb amputation. These insights may also be relevant to postsepsis patients undergoing other forms of transplantation or to VCA patients requiring additional future solid organ transplants.

Incorporating Trauma-informed Approaches to Care in Vascularized Composite Allotransplantation

Since 1998, vascularized composite allotransplantation (VCA) has been a growing area of research in the field of reconstructive surgery. Although conditions treated with VCA often result from a traumatic injury, there has been limited emphasis on incorporating trauma-informed care (TIC) models in VCA. Considering the importance of psychosocial well-being in VCA candidates and recipients, applying best practices in TIC to the face, upper extremity, and penile transplantation may be critical in minimizing retraumatization throughout the perioperative process. There are six main principles of TIC: safety; trustworthiness and transparency; peer support; collaboration and mutuality; empowerment and choice; and cultural, historical, and gender issues, which may be further incorporated in care for VCA patients. Evaluating for PTSD and incorporating TIC may have substantial benefit to postoperative outcomes.

What is needed to ensure long-term sustainability for the field of vascularized composite allotransplantation?

The field of vascularized composite allotransplantation (VCA) has demonstrated remarkable advances since its inception with some excellent long-term results in a variety of graft types. However, unlike solid organ transplantation, it has yet to become mainstream. We therefore discuss strategies on ensuring long-term sustainability by addressing continued clinical developments of VCA to improve the risk-to-benefit balance, importance of public support, improved policy and financial support, and need for a bridge to the future of transplant surgery. There has been headway on all fronts and collaboration among the VCA centers for centralization of data and incorporation of patient voices will be essential for continued progress.

Patient definitions of transplant success in upper extremity vascularized composite allotransplantation: A mixed-methods study

Objective

Upper extremity vascularized composite allotransplantation is an innovative treatment option for people with upper extremity amputations. Limited patient-relevant long-term outcomes data about transplant success may impede patients' informed treatment decision-making. We assessed perceptions of what constitutes upper extremity vascularized composite allotransplantation success among individuals with upper extremity amputations.

Methods

This multisite study entailed interviews and focus groups with individuals with upper extremity amputations and upper extremity vascularized composite allotransplantation candidates, participants, and recipients. We examined perceptions of transplant success and preferences for five upper extremity vascularized composite allotransplantation outcomes. Qualitative data were analyzed using thematic analysis; and quantitative data were analyzed using descriptive statistics.

Results

In all, 50 individuals participated in interviews (61.7% participation rate), and 37 participated in nine focus groups (75.5% participation rate). Most were White (72%, 73%), had a mean age of 45 and 48 years, and had a unilateral amputation (84%, 59%), respectively. Participants conceptualized upper extremity vascularized composite allotransplantation success as transplant outcomes: (1) restoring function and sensation to enable new activities; (2) accepting the transplanted limb into one's identity and appearance; (3) not having transplant rejection; (4) attaining greater quality of life compared to prosthetics; and (5) ensuring benefits outweigh risks. Participants rated their most important upper extremity vascularized composite allotransplantation outcomes as follows: not having transplant rejection, not developing health complications, grasping objects, feeling touch and temperature, and accepting the upper extremity vascularized composite allotransplantation into your identity.

Conclusion

Individuals with upper extremity amputations maintain several conceptions of vascularized composite allotransplantation success, spanning functional, psychosocial, clinical, and quality of life outcomes. Providers should address patients' conceptions of success to improve informed consent discussions and outcomes reporting for upper extremity vascularized composite allotransplantation.

Patient preferences of patient selection criteria for upper extremity vascularized composite allotransplantation: A qualitative study

Background

Upper extremity vascularized composite allotransplantation is a life-enhancing reconstructive treatment option that aims to improve recipients' quality of life and maximize function. This study assessed upper extremity vascularized composite allotransplantation patient selection criteria perceptions among individuals with upper extremity limb loss. The perceptions of individuals with upper extremity limb loss on patient selection criteria may enable vascularized composite allotransplantation centers to improve criteria to avoid mismatched expectations about the posttransplant vascularized composite allotransplantation experience and outcomes. Realistic patient expectations may increase patient adherence, improve outcomes, and reduce vascularized composite allotransplantation graft loss.

Methods

We conducted in-depth interviews with civilian and military service members with upper extremity limb loss and upper extremity vascularized composite allotransplantation candidates, participants, and recipients from three US institutions. Interviews assessed perceptions of patient selection criteria for suitability as a candidate for upper extremity vascularized composite allotransplantation. Thematic analysis was used to analyze qualitative data.

Results

A total of 50 individuals participated (66% participation rate). Most participants were male (78%), White (72%), with a unilateral limb loss (84%), and a mean age of 45 years. Six themes emerged regarding upper extremity vascularized composite allotransplantation patient selection criteria, including support for candidates who: (1) are of younger age, (2) are in good physical health, (3) have mental stability, (4) are willing to "put in the work," (5) have specific amputation characteristics, and (6) have sufficient social support. Patients had preferences about selecting candidates with unilateral versus bilateral limb loss.

Conclusions

Our findings suggest that numerous factors, including medical, social, and psychological characteristics, inform patients' perceptions of patient selection criteria for upper extremity vascularized composite allotransplantation. Patient perceptions of patient selection criteria should inform the development of validated screening measures that optimize patient outcomes.

Continuous versus Pulsatile Flow in 24-Hour Vascularized Composite Allograft Machine Perfusion in Swine: A Pilot Study

INTRODUCTION

Multiple perfusion systems have been investigated on vascularized composite allografts, with various temperatures and different preservation solutions, most using continuous flow (CF). However, physiological flow is pulsatile and provides better outcomes in kidney and lung ex vivo perfusions. The objective of this pilot study is to compare pulsatile flow (PF) with CF in our 24-h subnormothermic machine perfusion protocol for swine hindlimbs.

METHODS

Partial hindlimbs were harvested from Yorkshire pigs and perfused with a modified Steen solution at 21°C for 24 h either with CF (n = 3) or with pulsatile flow (PF) at 60 beats/min (n = 3). Perfusion parameters, endothelial markers, and muscle biopsies were assessed at different timepoints.

RESULTS

Overall, lactate levels were significantly lower in the PF group (P = 0.001). Glucose uptake and potassium concentration were similar in both groups throughout perfusion. Total nitric oxide levels were significantly higher in the PF group throughout perfusion (P = 0.032). Nitric oxide/endothelin-1 ratio also tends to be higher in the PF group, reflecting a potentially better vasoconductivity with PF, although not reaching statistical significance (P = 0.095). Arterial resistances were higher in the PF group (P < 0.001). Histological assessment did not show significant difference in muscular injury between the two groups. Weight increased quicker in the CF group but reached similar values with the PF after 24 h.

CONCLUSIONS

This pilot study suggests that PF may provide superior preservation of vascularized composite allografts when perfused for 24 h at subnormothermic temperatures, with potential improvement in endothelial function and decreased ischemic injury.

Psychosocial predictors in upper-extremity vascularized composite allotransplantation: A qualitative study of multidimensional experiences including patients, healthcare professionals, and close relatives

Background

The impact of patient-specific psychosocial factors on functional outcomes after upper-extremity (UE) vascularized composite allotransplantation (VCA) is poorly understood. The objective of this study was to identify relevant psychosocial predictors for success or failure of UE VCA in an Austrian cohort.

Methods

A qualitative study was undertaken consisting of semi-structured interviews with UE VCA staff, transplanted patients, and close relatives. Participants were asked about their perceptions of factors that either favored or hindered a successful transplant outcome, including functional status before surgery, preparation for transplant, decision-making, rehabilitation and functional outcome after surgery, and family and social support. Interviews were conducted online and recorded with the consent of interviewees.

Results

Four bilateral UE VCA patients, 7 healthcare professionals, and a sister of a patient participated in the study. Thematic analysis revealed the importance of an expert interdisciplinary team with adequate resources for patient selection. Psychosocial aspects of prospective candidates are crucial to evaluate as they contribute to success. Both patients and providers may be impacted by public perceptions of UE VCA. Functional outcomes are optimized with a life-long commitment to rehabilitation as well as close, ongoing provider involvement.

Conclusion

Psychosocial factors are important elements in the assessment and follow-up care for UE VCA. To best capture psychosocial elements of care, protocols must be individualized, patient-centered, and interdisciplinary. Investigating psychosocial predictors and collecting outcomes is, thus, critical to justifying UE VCA as a medical intervention and to providing accurate and salient information to prospective candidates.

Psychosocial and bioethical challenges and developments for the future of vascularized composite allotransplantation: A scoping review and viewpoint of recent developments and clinical experiences in the field of vascularized composite allotransplantation

Vascularized Composite Allotransplantation (VCA) has evolved in recent years, encompassing hand, face, uterus, penile, and lower extremity transplantation. Accordingly, without centralized oversight by United States Organ Procurement and Transplantation Network (OPTN) or European Programs, centers have developed their own practices and procedures that likely vary, and accordingly, present different levels of rigor to the evaluation process, internationally. The importance of psychosocial factors in the selection process and treatment course has been widely recognized, and therefore, several approaches have been developed to standardize and guide care of VCA candidates and recipients. We propose to develop an international multidisciplinary platform for the exchange of expertise that includes clinical, patient, and research perspectives. Patient perspectives would derive from peer education and the assessment of patient-reported outcomes. To establish a foundation for such a platform, future research should review and combine current VCA protocols, to develop the ethical framework for a standardized psychosocial evaluation and follow-up of VCA candidates and recipients. This review presents a comprehensive overview of recent results in the field of VCA, developments in structural aspects of VCA, and provides viewpoints driven from clinical experience.

Social support and transplantation

PURPOSE OF REVIEW

Social support has many benefits for patients undergoing organ transplantation, though inclusion of it as criteria for transplant listing has been debated. This review highlights recent developments in the research regarding social support and organ transplantation, including the impact of social support on transplantation and caregivers, interventions, COVID-19, and ethical perspectives.

RECENT FINDINGS

Social support and perceived social support have benefits for transplant patients, including increased quality of life and adherence. The providers of social support may also be impacted and the impact may vary based on patient and caregiver characteristics, including organ group and caregiver ethnicity. Debates regarding COVID-19 vaccine requirements for caregivers and ethical concerns about the inclusion of social support as criteria for transplant listing are also explored.

SUMMARY

Transplant patients benefit from social support, though additional research is needed on the impact of social support on transplant outcomes and the utility of the use of social support as criteria for transplant listing. There is also a need for more robust research on diverse caregiver populations, including the identification and use of supportive interventions for caregivers.

A Provider Perspective of Psychosocial Predictors of Upper-Extremity Vascularized Composite Allotransplantation Success

PURPOSE

We performed a qualitative study to understand the psychosocial factors associated with success in upper-extremity vascularized composite allotransplantation from the perspective of transplant providers.

METHODS

We recruited 13 providers actively involved in upper-extremity vascularized composite allotransplantation. Participants included physicians, nurses, social workers, occupational therapists, and research administrators. We conducted semistructured face-to-face focus group interviews using a guide that explored providers' perceptions of qualities contributing to transplant outcome. Topics included social support networks and their influence on recovery, barriers to treatment compliance and successful posttransplant rehabilitation, and the process of setting patients' expectations. We performed a thematic analysis that produced a list of themes, subthemes, and proposed hypotheses explaining how the themes related to the study's guiding questions.

RESULTS

The analysis identified numerous factors that contribute to transplant success: (1) recipients' prior experiences modify their ability to cope and adapt after transplantation, (2) behaviors and characteristics such as positivity influence candidacy and may be predictive of successful outcomes, and (3) social support is essential for improved function and compliance. The provider care team cited difficulty in predicting recipient compliance and in setting realistic expectations.

CONCLUSIONS

Motivated recipients with developed coping and resiliency, a positive attitude, and stable, physically-able caregivers are perceived by providers to have greater success after transplantation.

CLINICAL RELEVANCE

Findings from this work may help providers determine optimal candidates for upper-extremity vascularized composite allotransplantation.