Neurological Complications After Renal Transplantation: A Systematic Review and Meta-Analysis

Association between the age-adjusted Charlson Comorbidity Index and complications after kidney transplantation: a retrospective observational cohort study

BACKGROUND

Complications following kidney transplantation elevate the risks of readmission and mortality. The aim of this study was to assess the association between the age-adjusted Charlson Comorbidity Index (ACCI) and postoperative complications among kidney transplant (KT) recipients.

METHODS

Between January 2015 and March 2021, a study involving 886 kidney transplant recipients at the Third Affiliated Hospital of Sun Yat-sen University was conducted. Postoperative complications were defined by the Clavien-Dindo Classification of Surgical Complications. Target Maximum Likelihood Estimation (TMLE) was employed to assess the association between ACCI and postoperative complications. The odds ratio (OR) was computed to determine the relationship between ACCI and postoperative complications. Subsequent interaction and stratified analyses were performed to assess the robustness of the findings.

RESULTS

Out of 859 KT participants ultimately included in the study, 30.7% were documented to have encountered postoperative complications. Participants with an ACCI value exceeding 3 exhibited a notably increased risk of postoperative complications following multivariable adjustment [aOR = 1.64, 95% CI [1.21,2.21], p = 0.001]. Congestive heart failure (OR = 16.18, 95% CI [1.98-132.17], p < 0.001), peripheral vascular disease (OR = 2.32, 95% CI [1.48-3.78], p < 0.001), and chronic obstructive pulmonary disease (OR = 6.05, 95% CI [2.95-12.39], p < 0.001) emerged as the top three preoperative comorbidities significantly linked to postoperative complications in ACCI.

CONCLUSION

An ACCI value exceeding 3 preoperatively constituted a risk factor for postoperative complications among KT patients.

Current recommendations regarding evaluation of cognitive functioning in organ transplant candidates

PURPOSE OF REVIEW

Cognitive impairment is associated with negative effects on solid organ transplant candidates, recipients, and their care partners. However, because of the heterogeneity of mechanisms, presentations, and assessment measures, research suggests a wide array of impairments, patterns of impairments, and unclear trajectories posttransplant. This review provides an abbreviated synthesis of recent research on cognitive impairments observed in organ-eligible candidates and potential trajectories through posttransplant, current clinical recommendations regarding integration of assessment into routine clinical transplant practice, as well as recommendations for future research.

RECENT FINDINGS

Transplantation may resolve certain disease-contributing factors to cognitive impairments but also introduces new potential neurocognitive assaults. Recent studies in kidney and lung recipients document continued impairments in subsets of patients, particularly those identified as frail. For liver candidates, new assessment measures of hepatic encephalopathy have been developed and preliminarily tested with potential for translation into routine clinical care. Clinical implications, as well as ethical considerations are discussed.

SUMMARY

Although guidelines agree that cognitive assessment is an important part of the organ transplantation process, many questions remain of how to best assess cognition and intervene when cognitive impairment is identified in transplant populations. Further research should focus on prospective, longitudinal assessments in transplant-eligible populations through posttransplant.

Spinal Stroke following Kidney Transplant

Complications are a part of surgery. Spinal infarctions are a dreaded complication of aortic surgery. We present a patient who developed a spinal infarct after a kidney transplant. We were unable to find a causative factor in our search for etiology. In our review of the literature, we were unable to find a similar report. We present this case report to highlight a rare complication of kidney transplantation and to reinforce that patients requiring kidney transplant are complex patients with multiple comorbidities that can cause a multitude of complications in the periop period.

Headache changes after kidney transplant

Headache is considered as a possible complication of dialytic treatment in chronic kidney disease (CKD). The aim of this study was to evaluate possible change in headache characteristics after kidney transplantation in patients with CKD. During a 1-year period, we enrolled 110 subjects submitted to a kidney transplant in the previous 5 years. Headache characteristics before and after the transplant were investigated by a specific questionnaire. Possible effects of pharmacological therapies were also evaluated. 65.5% of patients complained of headache before the transplant (38.2% migraine and 14.5% dialysis headache). After transplant, 53.6% of patients reported changes in headache characteristics. In particular, 27.3% of the patients had a complete resolution, 19.1% presented a headache improvement and 7.2% showed a worsening. In both migraine and dialysis headache subgroups, steroids, beta-blockers and calcium channel blockers were associated with a significant improvement of headache. Kidney transplantation seems to impact significantly headache frequency and severity in patients with CKD. A careful evaluation and use of targeted treatments could improve both patients' compliance to therapies and quality of life.

Immunosuppression-related neurological disorders in kidney transplantation

A large number of neurological disorders can affect renal transplant recipients, potentially leading to disabling or life-threatening complications. Prevention, early diagnosis and appropriate management of these conditions are critical to avoid irreversible lesions. A pivotal role in the pathogenesis of common post-transplant neurological disorders is played by immunosuppressive therapy. The most frequently administered regimen consists of triple immunosuppression, which comprises a calcineurin inhibitor (CNI), a purine synthesis inhibitor and glucocorticoids. Some of these immunosuppressive drugs may lead to neurological signs and symptoms through direct neurotoxic effects, and all of them may be responsible for the development of tumors or opportunistic infections. In this review, after a brief summary of neurotoxic pathogenetic mechanisms encompassing recent advances in the field, we focus on the clinical presentation of more common and severe immunosuppression-related neurological complications, classifying them by characteristics of urgency and anatomic site. Our goal is to provide a general framework that addresses such clinical issues with a multidisciplinary approach, as these conditions require.

An Approach to Neurological Disorders in a Kidney Transplant Recipient

Kidney transplantation is the preferred treatment modality in patients with ESKD. However, there are associated complications that arise from immunosuppressive medications, infections, and associated comorbidities. Neurologic disorders frequently develop in patients who have received a kidney transplant, which in turn increases the associated morbidity and mortality. This review discusses the common neurologic disorders after kidney transplantation, including infections, cognitive decline, drug-related conditions, malignancy, seizure, and other neurologic complications.

Uncommon Complications in the First Year After Renal Transplantation

INTRODUCTION

Classic post-transplant complications are highly studied and monitored; however, other unusual complications may occur due to immunosuppression. The objective of this study is to show these rare complications in a kidney transplant center.

MATERIAL AND METHODS

Retrospective, observational, longitudinal study of renal transplants carried out from 2013 to 2017 in the Renal Transplant Unit of the National Medical Center Siglo XXI. A total of 790 transplants were performed, with surveillance for 1 year and rare events described. An analysis of frequencies and percentages of the events was performed using the statistical package SPSS version 25.

RESULTS

Of the 790 patients, 110 (13.92%) experienced rare events, classified into 9 types of complications.

DISCUSSION AND CONCLUSIONS

Complications exist in renal transplantation that are often ignored or minimized. A considerable number have been observed in this study, 110 events (13.92%); this result allows us to consider multiple possibilities in a kidney transplant program, especially infectious complications (34 patients) and surgical complications (29 cases). With the increase in diabetic receptor transplantation, metabolic complications will surely increase in the coming years.