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ORIGINAL RESEARCH article

Front. Surg., 28 April 2021
Sec. Vascular Surgery
This article is part of the Research Topic State of the Art in Vascular Access for Hemodialysis View all 5 articles

Vascular Access Perspectives in Patients After Kidney Transplantation

\nKrzysztof Letachowicz
Krzysztof Letachowicz1*Miros&#x;aw BanasikMirosław Banasik1Anna KrlickaAnna Królicka2Oktawia MazanowskaOktawia Mazanowska1Tomasz Go&#x;&#x;biowskiTomasz Gołębiowski1Hanna Augustyniak-BartosikHanna Augustyniak-Bartosik1S&#x;awomir ZmonarskiSławomir Zmonarski1Dorota Kami&#x;skaDorota Kamińska1Magdalena Kuriata-KordekMagdalena Kuriata-Kordek1Magdalena KrajewskaMagdalena Krajewska1
  • 1Department of Nephrology and Transplantation Medicine, Wroclaw Medical University, Wrocław, Poland
  • 2Faculty of Medicine, Wroclaw Medical University, Wrocław, Poland

Introduction: More attention has been paid to the influence of arteriovenous fistula (AVF) on the cardiovascular system. In renal transplant recipients, some beneficial effect of an elective vascular access (VA) ligation was observed in patients with a high AVF flow. However, this strategy is not widely accepted and is in contradiction to the rule of vasculature preservation for possible future access. The aim of our study is to elucidate the vascular access function and VA perspective in the kidney transplantation (KTx) population.

Materials and Methods: KTx patients with a stable graft function were recruited to participate in this single center observational study (NCT04478968). The measurement of VA flow and vessel mapping for future vascular access was performed by a color Doppler ultrasound. The study group included 99 (63%) males and 58 (37%) females; the median age was 57 (IQR 48–64) years. The median time from the transplantation to the baseline visit was 94 (IQR 61–149) months. Median serum creatinine concentration was 1.36 (IQR 1.13–1.67) mg/dl.

Results: Functioning VA was found in 83 out of 157 (52.9%) patients. The sites were as follows: snuffbox in six (7.2%), wrist in 41 (49.4%), distal forearm in 18 (21.7%), middle or proximal forearm in eight (9.6%), upper-arm AV graft in one (1.2%), and upper-arm AVFs in nine (10.8%) patients, respectively. Blood flow ranged from 248 to 7,830 ml/min; the median was 1,134 ml/min. From the transplantation to the study visit, 66 (44.6%) patients experienced access loss. Spontaneous thrombosis was the most common, and it occurred in 60 (90.9%) patients. The surgical closure of VA was performed only in six (4%) patients of the study group with a functioning VA at the time of transplantation. Access loss occurred within the 1st year after KTx in 33 (50%) patients. Majority (50 out of 83, 60.2%) of the patients with an active VA had options to create a snuffbox or wrist AVF on the contralateral extremity. In a group of 74 patients without a functioning VA, the creation of a snuffbox or wrist AVF on the non-dominant and dominant extremity was possible in seven (9.2%) and 40 (52.6%) patients, respectively. In 10 (13.1%) patients, the possibilities were limited only to the upper-arm or proximal forearm VA on both sides. Access ligation was considered by 15 out of 83 (18.1%) patients with a patent VA.

Conclusions: In the majority of the patients, vascular access blood flow was below the threshold of the negative cardiovascular effect of vascular access. Creation of a distal AVF is a protective measure to avoid a high flow and preserve the vessels for future access. The approach to VA should be individualized and adjusted to the patient's profile.

Introduction

Arteriovenous fistula (AVF) is considered as the optimal vascular access (VA) for hemodialysis, but its broad use is limited by multiple factors. The most important ones are comorbidities, quality of the vascular bed, and organizational issues (1, 2). The latter is illustrated by huge differences in the proportion of patients starting dialysis with use of a catheter and the percentage of forearm AVFs (3, 4). However, for a large group of patients, the dialysis is not an ultimate option and they undergo kidney transplantation (KTx). In this group, dialysis access is needed temporarily. In patients who have a transplanted kidney, the type of VA has not influenced the mortality and all-cause allograft loss (5). In recent years, the interest in VA in KTx recipients is growing. The main research topics are: cardiac impact, potential renal function preservation, transplantation-dialysis transition, patients and professionals' opinion (69). The problems of vascular access for dialysis could not be perceived until the very late phases of renal failure (despite regular follow up) in patients with a failing renal transplant resulting in a more frequent use of a catheter (10). Worse VA quality metrics were observed in other cohorts (11). The next important issue seems to be the AVF impact on the cardiovascular system. Beneficial effect in the form of a left ventricular mass reduction was observed after an elective AVF ligation in patients with a high vascular access flow (Qa). However, this strategy is not widely accepted. The question “to ligate or not to ligate” is still unanswered (12), but the aim of vessel preservation is essential (13). Vessel protection is one of the cornerstones of the End-Stage Kidney Disease plan (14). The aim of our study is to elucidate the AVF function and vascular access perspective in the KTx population.

Materials and Methods

Between July and October 2020, 157 patients at least 12 months after KTx were recruited to participate in a prospective observational study. The aim of the study was to recruit 75 patients with a functional AVF and 75 without VA. The study protocol was approved by the Institutional Ethical Committee at Wroclaw Medical University (KB-43/2020) and the study was registered (NCT04478968). All patients were served by the Department of Nephrology and Transplantation Medicine in Wroclaw Medical University. Written informed consent was obtained from all patients. Apart from the routine visit, all patients were assessed by an interventional nephrologist with an experience in access creation and monitoring. Clinical data were collected. They included information on the demographics, comorbidities, vascular access history and function, and routine laboratory data. The presence of a heart disease was defined as a history of coronary artery disease, valvular heart disease, or arrhythmia. Patients with dyspnea, peripheral edemas, or crackles on auscultation were classified as symptomatic. Patients were asked for their opinion on the ligation of VA. Clinical assessment of vascular access was performed. The AVFs were inspected, palpated, and the character of bruit was assessed. Finally, an arm elevation test was done (15). On the basis of physical examination, the functioning AVFs were categorized into four groups, from dysfunction to suspicion of high-flow. The vasculature of both upper extremities was assessed with an ultrasound. All ultrasound examinations were performed with the Samsung HS50 system. The extremities without a functioning arteriovenous fistula were screened to find the most distal possible site for future vascular access. Minimal vessel diameter suitable for AVF creation was set on 1.5 mm (and 2 mm in case of atherosclerosis) for an artery and 2 mm for a vein. Arteriovenous fistula flow was assessed in accordance with the guidelines (16). The characteristic of the studied cohort was summarized in Table 1. Most of the patients had been treated with hemodialysis before KTx. Majority of patients (151, 96.2%) received a graft from a deceased donor.

TABLE 1
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Table 1. Characteristics of the study group.

Statistical Analysis

All statistical analyses were performed using the Statistical 13.3 (StatSoft, Poland). The normality of data distribution was tested with the Shapiro–Wilk test. Categorical variables were presented as proportions and compared using the Chi Square test. Continuous data were presented as median and interquartile range. Non-parametric Mann–Whitney U and Kruskall-Wallis tests were used for numerical data analysis. A p-value below 0.05 was considered statistically significant.

Results

At the time of transplantation, 142 (90.4%) patients had been dialyzed with AVFs, three (1.9%) with AVG, three (1.9%) with a tunneled catheter, seven (4.4%) patients were on a peritoneal dialysis, and two (1.3%) patients had been transplanted preemptively. Two females had had a functioning vascular access on both upper extremities (dysfunctional AVFs and forearm AVF or AVG on the opposite site, respectively). Only four (2.5%) patients had never experienced any attempt of AVF creation: one patient underwent preemptive transplantation from a living donor and three patients were on a peritoneal dialysis. Functioning arteriovenous VA was present in 148 (94.2%) patients. Vascular access was located in the distal part of the extremity, in the proximal forearm, and on the upper arm in 120 (81.1%), eight (5.4%), and 20 (13.5%) patients with a proportion of first access of 72.5, 12.5, and 35%, respectively.

From the transplantation to the study visit, 66 (44.6%) patients experienced access loss. Spontaneous thrombosis was the most common, and it occurred in 60 (90.9%) patients. In three individuals, surgical revision was necessary. The surgical closure of VA was performed only in six patients (4% of the study group with a functioning AVF at the time of KTx). Access loss occurred within the 1st year after KTx in 33 (50%) patients. In 16 (24.2%) patients, access thrombosis was diagnosed in the 1st month after KTx. The comparison of groups with a functioning VA and after VA with spontaneous thrombosis is presented in Table 2.

TABLE 2
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Table 2. Comparison of patients with a functioning and thrombosed AVF.

On the study visit, a functioning AVF was found in 83 out of 157 (52.9%) patients. The AVF sites were as follows: snuffbox in six (7.2%), wrist in 41 (49.4%), distal forearm in 18 (21.7%), middle or proximal forearm in eight (9.6%), upper-arm AVG in one (1.2%), and upper-arm AVFs in nine (10.8%) patients, respectively. Blood flow ranged from 248 to 7,830 ml/min; the median was 1,134 ml/min. Median Qa was lower in patients with a diagnosis of diabetes mellitus compared to the patients without a comorbidity, 902 (492–1,362) vs. 1,185 (901–1,619) ml/min, p = 0.027. In 22 (26.5%) patients, Qa was higher than 1,500 ml/min. Patients with high-flow AVFs were younger than patients with AVFs with a Qa < 1,500 ml/min, 53.5 (48–59) vs. 61 (49–66) years old, p = 0.02. AVFs with a Qa > 1,500 ml/min were located more proximally (distal AVF in 68.2% in comparison to 88.5% in group with a lower Qa, p = 0.047). Mild symptoms of heart failure were observed in 25 (15.9%) KTx recipients. In symptomatic patients, the proportion of functioning AVF was similar compared to asymptomatic patients (60% vs. 51.5%, p = 0.43), Qa [1,135 (629–1,509) vs. 1,146 (827–1,551) ml/min, p = 0.71], and serum creatinine concentration [1.38 (1.15–1.75) vs. 1.35 (1.12–1.64) mg/dl, p = 0.75] were similar. However, the symptomatic patients were older [64 (61–69) vs. 55 (45–63) years old, p < 0.0001], the Charlson comorbidity index [5 (47) vs. 4 (35), p = 0.0003], and the prevalence of heart disease were higher (72 vs. 26.5%, p < 0.0001) compared to patients without symptoms of heart failure.

On the basis of clinical assessment, VA were qualified to one of four groups: dysfunction, moderate, excellent function, and high-flow. The Qa values were different between groups; 957 (454–1,203), 847 (559–1,047), 1,279 (982–1,522), and 3,434 (2,258–5,223) ml/min, respectively, p < 0.0001 (Figure 1). In four patients, signs of cephalic arch stenosis were observed and two patients had complained from mild extremity edema.

FIGURE 1
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Figure 1. Vascular access flows in relation to AVF function assessed by physical examination.

We had noticed that 14 (8.9%) patients had problems with the vascular access creation or had very limited vascular access options. History of coronary angiography from the radial artery, subclavian vein catheterization, and presence of pacemaker were found in seven (4.4%), five (3.2%), and six (3.8%) patients, respectively. Proportion of patent VA in a group of patients more than 10 years after transplantation was lower than in patients with a shorter KTx vintage, 64 from 102 (62.7%) vs. 19 from 55 (34.5%) patients, p = 0.0007. The majority of patients (50 of 83, 60.2%) with an active AVF had options to create a snuffbox or wrist AVF on the contralateral extremity. In 76 out of 83 (91.6%) patients, the creation of a forearm AVF was possible. In a group of 74 patients without a functioning VA, the creation of a snuffbox or wrist AVF on the non-dominant and dominant extremity was possible in seven (9.2%) and 40 (52.6%) patients, respectively. In 10 (13.1%) patients, the possibilities were limited only to the upper-arm or proximal forearm on both sides. In a subgroup of 124 patients with one or two VA attempts, there were 71 (57.3%) functioning and 53 (42.7%) occluded AVFs in contrary to 29 patients with at least three VA attempts, there were 12 (41.4%) functioning and 17 (58.6%) occluded AVFs (p = 0.12). The proportions of distal AVFs were as follows: 89.6, 92.1, 41.7, and 35.3%, respectively (p < 0.0001). Distal AVF was an option in 66 (88%) and five (41.7%) patients (<3 vs. ≥3 VA attempts) contralateral to the functioning VA (p < 0.0001). In patients with an occluded AVF, a new VA could be created in the distal part of the dominant or non-dominant extremity in 46 (86.8%) and five (29.4%) patients (<3 vs. ≥3 VA attempts) (p < 0.0001), respectively. Access ligation was considered by 15 out of 83 (18.1%) patients with a patent AVF.

Discussion

The approach to a functioning AVF in renal transplant recipients is ambiguous. Vascular access function is not routinely assessed in patients after renal transplantation. Routine VA surveillance was performed only by 29% of the responders to a survey investigating the preferences for management of VA after transplantation (9). A large proportion of patients with a failed graft reinitiating dialysis with catheter is a proof of suboptimal care in this area. Based on the data from the United States Renal Data System, it was found that in the first quarter after dialysis restart catheters were used in 53.1% of patients. AVF use was 37.4%, and it increased to 62.6% in the fourth quarter (10). In a Canadian cohort, starting dialysis after KTx failure, only 13%, 26%, and 38% of patients had an AV access creation in the postdialysis period at three, six, and 12 months, respectively (11). On the other hand, Manca et al. reported that 49 out of 89 patients restarted hemodialysis with the use of a still functioning AVF, and in the next 40 patients, a new VA had to be created (17). It is in line with the observation of Weyde et al. where a patent AVF that could be used immediately as VA was found in 49% of KTx recipients restarting dialysis. Proximal re-anastomosis on the forearm was successfully performed in 82 out of 112 patients (18). This approach resulted in a high prevalence of AVF in patients with a history of failed KTx (19).

In the present study, we sought to assess the quality of vascular access in a group of KTx recipients. In the majority of the studies in KTx patients, the function of vascular access was not considered except in focusing on its potential role. In those projects, usually only patients with high flow AVFs were included. We found that despite the distal location of AVF in the majority of our patients, the Qas were high but usually were below the threshold for hyperkinetic AVF. On the other side, the proportion of dysfunctional AVFs was low. Moreover, the majority of stenosis were located proximally, not close to the anastomosis as usual in the case of wrist AVFs. We were also able to identify patients who are at risk of a high-flow AVF on the basis of physical examination and also patients with limited vascular access perspectives. Finally, majority of the patients did not want to close the AVF. It is in line with our questionnaire-based study (8). It could be a consequence of our former view that the cardiovascular effect of a functioning AVF is mild and high prevalence of distal AVFs. We have to mention that the blood pressures recorded on the study visit were beyond the recommended values. The nature of this observation has to be explained but we suspect that it was related to the increased stress related to visits during the COVID-19 outbreak. Many patients participating in the study attended our transplantation office after missing a previously scheduled appointment. Moreover, visit to the clinic was related with filling questionnaires and crossing a few checkpoints. It is sure that the COVID-19 pandemic's impact on lifestyle factors, behaviors, and environmental changes are likely to have an influence on blood pressure control and cardiovascular risk (20).

Creation of AVF leads to hemodynamic effects like a decrease in blood pressure and total peripheral resistance, and an increase in heart rate, stroke volume, and cardiac output. After a few weeks, a blood volume and left ventricle diastolic diameter increase could occur. Further consequences of AVF creation are left ventricle hypertrophy, diastolic and systolic dysfunction, and increase in pulmonary flow and pulmonary hypertension (6, 21). Described effects are reversible after access closure, and are, at least partially, related to access flow volume (2224). However, this correlation is not linear (25). It was shown that patients with a left ventricle hypertrophy (LVH) and left atrial enlargement had a worse outcome (26). Closure of AVF is an intervention that results in a decrease in LVH (22, 27). Routine closure of a functioning vascular access after successful KTx is not recommended in the guidelines and should be considered in patients with a refractory heart failure after transplantation (28). Recently, the effect of VA ligation on left ventricular mass was tested in the randomized study performed in stable KTx recipients. It was found that the removal of AVF improved the left ventricle remodeling and resulted in a reduction of NT-proBNP (27). However, it should be noted that in our study cohort, Qa and prevalence of upper arm AVFs were lower. In a recent study of Hetz et al. conducted in KTx patients with a Qa>1,500 ml/min., the prevention of right sided heart failure was noticed after VA ligature (29).

The further effect that could be influenced by fistula closure is the eGFR trajectory. In the observational study, it was found that patients with a persistent AVF at 1 year had a worse kidney function. They also had an increased risk for future allograft loss at 5 years (30). In contrary, Weekers et al. found that the closure of a patent VA significantly accelerated the eGFR decline over the 1-year observation (7). It was in line with the former observation of Golper who reported that the creation of AVF could slow the eGFR trajectory (31). The results of a recent meta-analysis demonstrated that AVF closure was related with an improved cardiac morphology, and a better kidney graft function and AVF closure had been suggested as a considerable approach in patients with a well-functioning allograft (32). Despite the modification of the cardiovascular risk through an intervention on AVF seems to be a promising intervention in KTx recipients, the patients were not convinced to a routine VA ligation (8). An alternative option could be a precision flow reduction by banding with a real-time access flow assessment or banding with the use of a sizing dowel (3335). Using the data from the United States Renal Data Systems, it was found that AV access ligation was uncommon and performed in 4.6% of patients. Ligation was not associated with a post-transplant allograft failure and reduction in the all-cause mortality with AV access ligation. Based on literature data (36) and our own observation, we would not recommend a routine VA closure after KTx. More attention should be given to avoid the creation of high flow AVFs. The shift toward the creation of AVFs at the snuffbox seems to be the right direction (37, 38). We would also advise the routine evaluation of VA in KTx recipients at 1 year after transplantation to stratify the risk of a potential negative cardiovascular effect. Patients with previous multiple AVFs are at an increased risk of exhaustion of vascular access options. They should be very carefully assessed before every intervention on a functioning AVF and referred earlier for VA creation in case of a kidney graft failure progression. We are aware of the limitations of our study. First, it was a single center study. In addition, it involved a relatively small number of participants that constitutes about one eighth of our KTx patients and could not be a representative for the whole cohort. On the other hand, the baseline characteristic of our study group was similar in some aspects to previous reports (3941). Finally, we believe that the problems of vascular access in KTx recipients were appropriately illustrated.

Conclusions

Forearm AVF flows in kidney transplantation patients are below the threshold of the negative cardiovascular effect of vascular access. Creation of distal AVFs is a protective measure to avoid high flow and preserve vessels for future access. The approach to VA should be individualized and adjusted to the patient's profile. Doppler ultrasound assessment of a functioning AVF after a successful kidney transplantation is advisable.

Data Availability Statement

The raw data supporting the conclusions of this article will be made available by the authors on reasonable request.

Ethics Statement

The studies involving human participants were reviewed and approved by Institutional Ethical Committee at Wroclaw Medical University. The patients/participants provided their written informed consent to participate in this study.

Author Contributions

KL contributed to the study concept, acquisition of data, analysis and interpretation of data, and preparation of the manuscript. AK, TG, HA-B, SZ, and MK-K contributed to the acquisition of data and revision of the manuscript. MB, OM, DK, and MK contributed to the study concept, design, and revision of the manuscript. All authors contributed to the article and approved the submitted version.

Funding

This study was supported by Grant 2019/03/X/NZ5/01770 of the National Science Center, Poland.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Keywords: vascular access, arteriovenous fistula, end-stage kidney disease, hemodialysis, hemodialysis catheter, kidney transplantation, vascular access after transplantation

Citation: Letachowicz K, Banasik M, Królicka A, Mazanowska O, Gołębiowski T, Augustyniak-Bartosik H, Zmonarski S, Kamińska D, Kuriata-Kordek M and Krajewska M (2021) Vascular Access Perspectives in Patients After Kidney Transplantation. Front. Surg. 8:640986. doi: 10.3389/fsurg.2021.640986

Received: 12 December 2020; Accepted: 16 March 2021;
Published: 28 April 2021.

Edited by:

Raffaele Serra, University of Catanzaro, Italy

Reviewed by:

Efstratios Georgakarakos, Democritus University of Thrace, Greece
Marian Klinger, Opole University, Poland

Copyright © 2021 Letachowicz, Banasik, Królicka, Mazanowska, Gołębiowski, Augustyniak-Bartosik, Zmonarski, Kamińska, Kuriata-Kordek and Krajewska. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Krzysztof Letachowicz, krzysztof.letachowicz@umed.wroc.pl

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