Temporary central venous catheter at hemodialysis initiation and reasons for use: a cross-sectional study
Renal Replacement Therapy volume 7, Article number: 2 (2021)
Creating permanent vascular access (VA) is recommended before hemodialysis initiation in patients with end-stage renal disease (ESRD). Although many patients are still introduced to hemodialysis with temporary central venous catheters (CVCs), the reasons for their use remain unclear. We aimed to clarify the characteristics of Japanese patients introduced to hemodialysis using temporary CVCs, the reasons for their use, and whether this rate can be reduced in the future.
We conducted this cross-sectional study in an acute care general hospital in Japan. We enrolled 393 patients aged ≥ 18 years who received a permanent VA creation for initiating hemodialysis. We classified participants into the temporary CVC group or the permanent VA group according to the VA type at hemodialysis initiation and compared their backgrounds. We identified why permanent VA could not be used at hemodialysis initiation for patients in the temporary CVC group.
Of the 393 patients, 137 (35%) initiated hemodialysis with a temporary CVC, and arteriovenous fistulas (AVFs) were created as the first VA in all patients during hospitalization following hemodialysis initiation. The remaining 256 patients (65%) initiated hemodialysis via AVF cannulation. The duration of predialysis nephrology care was significantly shorter in the temporary CVC group than that in the permanent VA group. The median time from AVF creation to the first successful cannulation was also shorter in the temporary CVC group (8 vs. 66 days, P < 0.001), but the estimated glomerular filtration rate values at hemodialysis initiation did not differ. Reasons for temporary CVC use were varied and complex. Problems on the part of healthcare providers, patient behavioral issues, and characteristics of causative kidney disease itself were underlying reasons. Delayed referral to a nephrologist was less frequent than expected (16%) and the most commonly reported reason (20%) was that a nephrologist was unable to predict the timing of hemodialysis initiation.
Patients with ESRD should be referred to a nephrologist earlier for AVF creation. However, given the already relatively high rate of hemodialysis initiation with permanent VA in Japan, we considered it surprisingly difficult to further reduce the temporary CVC usage rate in Japan.
The number of patients with end-stage renal disease (ESRD) continues to increase, with more than 2 million patients being treated for ESRD worldwide. Of the three renal replacement therapies (RRTs)—hemodialysis (HD), peritoneal dialysis (PD), and kidney transplantation—the largest proportion of patients were receiving HD . Maintaining easily usable vascular access (VA) is critical in patients on HD , and this access is greatly influenced by how the initial VA was created [3, 4]. The Japanese Society for Dialysis Therapy (JSDT) clinical guidelines for the construction and repair of VA recommends that the timing of VA creation should be determined based on the clinical symptoms and an estimated glomerular filtration rate (eGFR) of 15 mL/min/1.73 m2 or less. It also advises predicting the timing of HD initiation from laboratory data and clinical symptoms and creating an arteriovenous fistula (AVF), which is the most common type of VA, at least 2 to 4 weeks before the initial cannulation .
These recommendations are based on reports from the JSDT Statistic Survey indicating that the mortality rate was significantly lower in patients who received permanent VA creation 1 to 6 months before HD initiation than in patients who received permanent VA creation between 1 month and the day before HD initiation ; likewise, the Dialysis Outcomes and Practice Patterns Study (DOPPS) indicated that receiving the first cannulation within 2 weeks after AVF creation increased VA failure . Additionally, HD initiation with a temporary central venous catheter (CVC) has been reported to have higher costs and longer hospital stays than permanent VA, such as an AVF and arteriovenous graft (AVG) .
However, in many cases, HD must be initiated with a temporary CVC in emergency situations due to delayed consultations or rapidly progressive renal diseases. Additionally, it is difficult to create a well-timed VA because the practical conditions of the community and facility, including the surgeon’s intensions and operating room availability, are complicated . By comparison, 80% of patients in the USA used a temporary CVC at HD initiation  whereas this rate was approximately 30% in Japan [9, 10].
Although decreasing the rate of using a temporary CVC at HD introduction would both improve patient prognosis and control healthcare costs by reducing hospitalization time and VA failure, few reports have identified the characteristics and reasons associated with initiating HD with a temporary CVC . We believe that it is possible to identify strategies for reducing the rate of HD initiation with a temporary CVC by determining the reasons for using a temporary CVC at HD initiation. Therefore, this study aimed to clarify the characteristics of patients who were initiated on HD with a temporary CVC and to determine why temporary CVCs were used for reducing the rate of HD initiation with temporary CVCs in the future. We also surveyed the types of permanent VA created and the time from the creation to the first cannulation of permanent VA.
Study design and participants
This cross-sectional study was conducted in a single facility of the Iwate Prefectural Central Hospital, an acute care general hospital in Japan. The inclusion criteria were as follows: (1) patients who had received permanent VA creation at our department for the introduction of chronic HD between April 2014 and March 2019; (2) 18 years of age or older; and (3) patients in whom HD was initiated by March 2020 at our hospital or two related facilities. Data on 414 patients who met these criteria were extracted from medical records, including surgical registers and dialysis patient lists. The exclusion criteria were as follows: (1) patients who discontinued HD due to recovery of renal function (n = 9), (2) patients with a history of PD (n = 8), (3) patients with a history of HD (n = 1), and (4) patients who died during hospitalization following HD initiation (n = 3). Thus, 393 patients were enrolled in this study (Fig. 1). We classified the participants into the temporary CVC group or the permanent VA group according to the type of VA at HD initiation and compared their background characteristics.
Clinical data at HD initiation were obtained from medical records and included age, sex, causative disease leading to ESRD, eGFR, serum creatinine levels, and hemoglobin levels. The eGFR was calculated using the three-variable Japanese equation (age, sex, and serum creatinine) . The periods in which the patients received predialysis medical care from nephrologists were categorized as follows: 0–6 months, 6–12 months, 1–2 years, 2–5 years, or > 5 years.
Identification of the reasons for using a temporary CVC at HD initiation
We reviewed medical records to identify why the patients in the temporary CVC group were unable to establish permanent VA at HD initiation. The reason was determined by the concurrence of two nephrologists. We also surveyed the types of first permanent VA created in the CVC group and the time from HD initiation to the creation and first cannulation of permanent VA.
The preferred types of VA in our department
The most preferred type of VA was radio-cephalic AVF, followed by brachio-cephalic AVF, and ulno-basilic AVF. Several AVGs and subcutaneously fixed superficial arteries had been created when AVFs could not be created, but no tunneled CVCs were created for several years in our department.
The clinical parameters are shown as the mean ± standard deviation, median (25th–75th percentiles), or percentage, as appropriate. The Student’s t test and Mann-Whitney U test were used to compare normally and non-normally distributed variables between two groups, respectively. Chi-square tests of independence were used to compare categorical variables between the groups. We also performed a multiple logistic regression analysis to determine the characteristics associated with temporary CVC use in patients with chronic kidney disease (CKD). Statistical analyses were performed using STATA version 15.8 (Stata Corp., College Station, TX). P < 0.05 was considered statistically significant.
Patient groups and their first permanent VA
Of the 393 patients included in this study, HD was initiated using a temporary CVC in 137 (35%). An AVF was created in all patients in the temporary CVC group during hospitalization following HD initiation, and most patients were transferred to a maintenance dialysis facility after their AVF became usable. All of the remaining 256 patients (65%) initiated HD via AVF cannulation. None of the patients in either group had an AVG or tunneled CVC established as their first permanent VA (Fig. 1).
Comparison of patient backgrounds between the temporary CVC group and the permanent VA group
The patient backgrounds of both groups are shown in Table 1. There was no difference in the mean age between the temporary CVC group (67.4 ± 14.4 years) and the permanent VA group (66.2 ± 14.7 years). Males accounted for more than two-thirds of the patients in both groups. In the temporary CVC group, 60% of the patients had been treated by a nephrologist for less than 6 months, and only 35% had been treated by a nephrologist for more than 1 year. By contrast, in the permanent VA group, 71% of the patients had received predialysis nephrology care for more than 1 year, and only 18% had received such care for less than 6 months (P < 0.001). In both groups, diabetic kidney disease was the most common cause of ESRD, followed by hypertensive nephrosclerosis and chronic glomerulonephritis. The temporary CVC group comprised more patients with rapidly progressive glomerulonephritis (RPGN) and acute kidney injury (AKI) than that in the permanent VA group (9.5% vs. 2.7% and 3.6% vs. 0%, respectively, P = 0.004). A slightly higher percentage of patients in the permanent VA group had diabetic kidney disease than in the temporary CVC group (39% vs. 33%, respectively). The median serum creatinine level in the temporary CVC group (7.90 mg/dL (25th–75th percentiles, 6.76–9.69)) was significantly lower than that in the permanent VA group (8.64 mg/dL (7.28–10.37)) (P = 0.017), but the eGFR values did not differ significantly (5.34 (4.36–6.65) and 5.03 (4.14–6.06) mL/min/1.73 m2, respectively (P = 0.057)).
Multiple logistic regression analysis to determine characteristics associated with temporary CVC use in patients with CKD only (Table 2)
After the exclusion of RPGN and AKI, 368 patients with CKD remained. Age, sex, and kidney disease due to ESRD were not associated with temporary CVC use. Nephrology care had a strong negative association with temporary CVC use, with an odds ratio of 0.643 per one category increase (P < 0.001). eGFR and hemoglobin levels were also significantly associated with temporary CVC use, although the causal relationship was unclear.
The time to the first successful cannulation of permanent VAs
All patients in both groups had an AVF created as their first type of permanent VA. The median time from the AVF creation to the first successful cannulation was significantly shorter in the temporary CVC group than in the permanent VA group (8 vs. 66 days, Table 2, P < 0.001). As shown in Fig. 2a, more than 80% of patients in the temporary CVC group had an AVF successfully punctured within 14 days after AVF creation. Therefore, HD at the initial puncture was often performed in a single-needle mode. By contrast, in the permanent VA group, 175 patients (68%) were punctured after 30 days, and 46 patients (18%) were punctured after 6 months (Fig. 2b). In the temporary CVC group, the median time from HD initiation to AVF creation was 10 days (6–17), and the median time from HD initiation to the first successful cannulation of AVF was 19 days (14–24). Thus, more than half of these patients used their temporary CVC for less than 3 weeks.
Reasons for using a temporary CVC at HD initiation
The reasons for using a temporary CVC at HD initiation were varied and complex. These reasons could be categorized into nine groups based on the discussion and agreement of two nephrologists and are listed in Table 3 in a descending order of number. The most commonly reported reason (20%) for using a temporary CVC was the physician being unable to predict the timing of HD initiation despite the patient attending our outpatient clinic for CKD. Delayed referral was reported less frequently than expected (16%), and a surprisingly high 15% of patients reported temporary CVC use because of acute exacerbation of kidney function from infection, cardiovascular disease, gastrointestinal disease, etc. Furthermore, 24% of the reasons for temporary CVC use were related to problems with patients’ behavior, including patients who could not reach a decision to create permanent VA for their hesitation and refusal and patients who had not seen a physician. The various characteristics of the causative kidney disease itself were responsible for initiating temporary CVC use in approximately 20% of such patients, including the patients with RPGN or AKI, patients whose edema was significantly worse, and patients on immunosuppressive therapy for non-diabetic nephrotic syndrome. HD could not be initiated in seven cases (5%) using a created AVF because of obstruction or underdevelopment. In summary, problems on the part of healthcare providers, patient behavioral issues, and the characteristics of causative kidney disease itself were the underlying reasons for using a temporary CVC at HD initiation.
Patient characteristics stratified by the reasons for using a temporary CVC at HD initiation
The patient characteristics stratified by the reasons for using a temporary CVC at HD initiation are shown in Additional file 1. The patients who had not seen a physician or who had their hospital visits interrupted were the youngest with a mean age of 57 years and had the lowest mean hemoglobin level (7.3 g/dL). The highest eGFR was found in patients on immunosuppressive therapy for non-diabetic nephrotic syndrome (median of 13.68 mL/min/1.73 m2). The patients who required urgent HD initiation because of RPGN or AKI comprised a higher percentage of women (53%); these patients also had the lowest median eGFR (3.96 mL/min/1.73 m2). Diabetic kidney disease was present in two-thirds of the patients who had initiated HD using temporary CVC due to severe edema. Not surprisingly, the duration of nephrologist treatment was extremely short in the patients who already presented with ESRD at our referral despite attending another outpatient clinic and in patients who had not seen a physician or had interrupted their hospital visits. Thus, the categorized groups had patient characteristics consistent with their respective reasons for temporary CVC use.
This study in a Japanese acute care general hospital showed that 35% of patients were introduced to HD with a temporary CVC. The remaining 65% were introduced to HD with an AVF. The present study also revealed that a usable AVF, which was not an AVG or a tunneled CVC, could be created even in patients of the temporary CVC group during consecutive hospitalization following HD initiation. The most significant difference between the two groups was the duration of predialysis nephrology care. In the temporary CVC group, 60% of patients had been treated by a nephrologist for less than 6 months whereas only 18% of patients in the permanent VA group had been treated for less than 6 months. Additionally, the time to the first puncture of the AVF was significantly shorter in the temporary CVC group than in the permanent VA group. We found that the reasons for using a temporary CVC at HD initiation were varied and complex. Problems on the part of healthcare providers, patient behavioral issues, and the characteristics of causative kidney disease itself were the underlying reasons.
All patients in this study received an AVF creation as their first permanent type of VA, which had the best prognosis of all types of VA. Considering that approximately 90% of chronic HD patients in Japan use AVFs and just under 10% use AVGs , this was a very favorable result. The rate of using a temporary CVC at HD initiation was reported to be approximately 20–30% in Japan [9, 14]. This slightly higher proportion in the present study might be due to the higher rate of RPGN and AKI in patients undergoing HD initiation compared with a Japan nationwide report . Additionally, patients who started HD using a temporary CVC in this study could use an AVF at a median of 19 days, and all patients could use an AVF within 90 days. Compared to the USA, where 68% of patients were still using a CVC at 90 days after HD initiation , we found that AVFs were created promptly in the patients in whom HD was initiated with a temporary CVC in this study. Although various international comparisons have been conducted by the DOPPS, the rate of initiating HD with a temporary CVC should be compared, and a numerical target should be determined in the practice guidelines.
In the present study, AVFs were punctured earlier in the temporary CVC group compared with previous studies. The late referral to a nephrologist and the short duration of predialysis nephrology care were reported to increase the rate of HD initiation with a temporary CVC and lead to early AVF cannulation [16, 17]. Although this study did not investigate patient prognosis, a late referral and HD initiation with a temporary CVC have been reported to be associated with poor prognosis [18, 19], and early AVF puncture has been shown to increase AVF failure [9, 16]. Thus, particular attention should be paid to AVF failure in patients with a temporary CVC.
To date, few studies have investigated the reasons for using a temporary CVC at HD initiation. A previous study more than 20 years ago cited late referral to a nephrologist, late referral to a surgeon, and late decision-making of the patient as the main reasons for using temporary CVCs . However, the primary reason identified in this study was the failure of an attending nephrologist to predict the timing of dialysis initiation; only 16% of a temporary CVC use was attributed to a late referral. Furthermore, we should emphasize that in our hospital, we, the nephrologists who decided to initiate HD, created the permanent VA ourselves and were easily able to coordinate the date of surgery; thus, there was no delay in referral to the surgeon and few environmental factors that delayed the creation of VA.
It was unclear why AVF could be created in all subjects of the present study, but it might be the result of efforts to create an AVF as much as possible by the nephrologists who were managing VA after HD introduction themselves. Compared with the USA and European countries, the small number of obese patients in Japan might have affected the creation and maturation of AVFs . We have found it difficult to create an AVF in patients with a body mass index of 30 or higher . However, we should not neglect our efforts to create an AVF because an AVF is considered the type of VA with the highest patency rate even in obese patients .
In the present study, the duration of predialysis nephrology care was significantly shorter in the temporary CVC group than in the permanent VA group, and duration of predialysis nephrology care was revealed to have a strong association with temporary CVC use in the multiple logistic regression analysis. Although late referral to a nephrologist was not a direct cause for using a temporary CVC at HD initiation in many patients, the shorter duration of predialysis nephrology care might have had an indirect effect, particularly on the group of patients who could not make the decision to receive permanent VA creation for their hesitation and refusal. Patients’ conditions including the type of VA at HD initiation have been reported to influence their prognosis after the initiation of HD [10, 21, 22]. Therefore, an attending physician should refer CKD patients to a nephrologist at least 6 months before the predicted initiation of HD based on the declining eGFR.
We found that there were some patients in whom HD had to be initiated using CVCs in the current medical standard, including some patients with AKI and external factors such as infectious diseases and some with edema so severe that AVF could not be created. This study also revealed that the timing for starting dialysis was unpredictable in many patients despite having visited a nephrologist. Although a previous study discussed how to predict dialysis initiation , it may be difficult even for nephrologists to accurately predict the timing for dialysis initiation, and the development of a more accurate tool to predict dialysis initiation may be needed. In addition, there is a large difference in attitudes concerning the creation of an AVF before initiating HD. Opinions differ not only between physicians in different facilities but also between physicians of the same facility. We therefore consider it necessary to spread the significance of AVF creation before initiating HD to many physicians. Conversely, 18% of patients in the permanent VA group started HD at least 6 months after AVF creation, and several patients were initiated HD using a CVC due to an AVF obstruction. In Japan, the mortality rate before beginning dialysis in CKD patients is lower than that in the USA or European countries [24, 25]. However, we must be careful not to create AVFs too early because the increased risk of AVF obstruction has been reported in Japan when AVFs are created too early .
The time to the first cannulation from AVF creation in the CVC group was very short in this study compared with other countries . Two main reasons for this difference were considered. First, this may have been performed to reduce the risk of infection. Because the long implantation of temporary CVCs is known to increase the risk of catheter infection , shortening the duration of their use might have been a priority in the subjects of this study. Secondly, AVF punctures might have been performed earlier so the patients could be discharged earlier because of the emphasis on shortening the length of hospital stay given Japan’s insurance practice. However, since early AVF cannulation may be more problematic in the long term, it is necessary to examine whether early AVF cannulation increases AVF failures after HD initiation in the subjects of this study in the future.
This study has some strengths compared to a similar survey in the past , such as collecting more details and performing a comparison with the permanent VA group. However, the results should be understood under some limitations. First, because this study was conducted at a single center in the northeast area of Japan, the findings in this study might not be generalizable to patients outside of Japan under different healthcare systems. Furthermore, more than 90% of patients with ESRD chose HD as their first RRT in our department where this study was conducted. In situations where more CKD patients choose PD or preemptive kidney transplantation as their first RRT, the number of patients who initiated HD with a permanent VA may decrease and the using rate of temporary CVC may increase. Second, because this was a cross-sectional study, we could not clarify the patients’ survival and VA prognosis in the temporary CVC group.
This study revealed the characteristics and reasons why patients were initiated on HD with a temporary CVC. ESRD patients should be referred to a nephrologist earlier for AVF creation. However, we found that the reasons for using a temporary CVC at HD initiation were varied and complex. Given the already relatively high rate of HD initiation with permanent VA in Japan, it may be surprisingly difficult to further reduce the rate of temporary CVC use at HD initiation by changing the behavior of healthcare providers and CKD patients. Future international prospective studies are necessary to reveal more details of the reasons for using a temporary CVC at HD initiation worldwide, and we hope the rate of temporary CVC use is gradually reduced as much as possible in the future.
Availability of data and materials
The datasets used and/or analyzed during the present study are available from the corresponding author upon reasonable request.
Acute kidney injury
Chronic kidney disease
Central venous catheter
Dialysis Outcomes and Practice Patterns Study
Estimated glomerular filtration rate
End-stage renal disease
Japan Society for Dialysis Therapy
Rapidly progressive glomerulonephritis
Renal replacement therapy
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This work originated from the Iwate Prefectural Central Hospital.
This study was not supported by any grant or sponsor.
Ethics approval and consent to participate
The Ethics Committee of Iwate Prefectural Central Hospital approved this study, and it was conducted in accordance with the ethical principles of the Declaration of Helsinki. We did not obtain written informed consent from the patients because the ethical guidelines for epidemiological research in Japan do not require informed consent for a cross-sectional study using only existing medical records.
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Nakaya, I., Goto, T., Nakamura, Y. et al. Temporary central venous catheter at hemodialysis initiation and reasons for use: a cross-sectional study. Ren Replace Ther 7, 2 (2021). https://doi.org/10.1186/s41100-021-00318-y