BACKGROUND Chronic subdural hematoma (CSDH) is fundamentally treatable with about 2-31% recurrence rate. Recently, there has been renewed interest in the association between Blood Urea Nitrogen (BUN) and intracranial lesion. Therefore, this paper attempts to show the relationship between BUN and CSDH recurrence.
METHODS A total of 661 CSDH cases with Burr-hole Irrigation (BHI) were enrolled from December 2014 to April 2019. The analyzed parameters included age, gender, comorbidities, laboratory investigations, medication use and hematoma location. The cases were divided into recurrence and non-recurrence groups while postoperative BUN concentration was further separated into quartiles (Q1 ≤ 4.0 mmol/L, 4.0 < Q2 ≤ 4.9 mmol/L, 4.9 < Q2 ≤ 6.4 mmol/L, Q4 > 6.4 mmol/L). Restricted cubic spline regressions and logistic regression models were performed to estimate the effect of BUN on CSDH recurrence.
RESULTS CSDH recurrence was observed in 97(14.8%) cases. Significant distinctions were observed between recurrence and non-recurrence groups in BUN quartiles of cases ( P =0.004). After adjusting for the potential confounders, the odds ratio of recurrence was 3.124 (95%CI =1.509–6.468, p = 0.002) for the highest quartile of BUN compared with the lowest quartile. In multiple-adjusted spline regression, high BUN level visually showed significantly high OR value of recurrence risk.
CONCLUSIONS Elevated BUN at post-operation is significantly associated with the recurrence of CSDH, and it is indicated that high levels of serum BUN after evacuation may be served as a risk factor for CSDH recurrence.

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On 28 Oct, 2020
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Invitations sent on 20 Aug, 2020
On 18 Aug, 2020
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Posted 18 Mar, 2020
On 05 Aug, 2020
Received 29 Jul, 2020
On 25 Jul, 2020
Received 29 Jun, 2020
On 24 May, 2020
Invitations sent on 24 Mar, 2020
On 11 Mar, 2020
On 10 Mar, 2020
On 10 Mar, 2020
On 10 Mar, 2020
On 28 Oct, 2020
On 27 Oct, 2020
On 26 Oct, 2020
On 26 Oct, 2020
On 23 Oct, 2020
On 25 Aug, 2020
Invitations sent on 20 Aug, 2020
On 18 Aug, 2020
On 17 Aug, 2020
On 17 Aug, 2020
Posted 18 Mar, 2020
On 05 Aug, 2020
Received 29 Jul, 2020
On 25 Jul, 2020
Received 29 Jun, 2020
On 24 May, 2020
Invitations sent on 24 Mar, 2020
On 11 Mar, 2020
On 10 Mar, 2020
On 10 Mar, 2020
On 10 Mar, 2020
BACKGROUND Chronic subdural hematoma (CSDH) is fundamentally treatable with about 2-31% recurrence rate. Recently, there has been renewed interest in the association between Blood Urea Nitrogen (BUN) and intracranial lesion. Therefore, this paper attempts to show the relationship between BUN and CSDH recurrence.
METHODS A total of 661 CSDH cases with Burr-hole Irrigation (BHI) were enrolled from December 2014 to April 2019. The analyzed parameters included age, gender, comorbidities, laboratory investigations, medication use and hematoma location. The cases were divided into recurrence and non-recurrence groups while postoperative BUN concentration was further separated into quartiles (Q1 ≤ 4.0 mmol/L, 4.0 < Q2 ≤ 4.9 mmol/L, 4.9 < Q2 ≤ 6.4 mmol/L, Q4 > 6.4 mmol/L). Restricted cubic spline regressions and logistic regression models were performed to estimate the effect of BUN on CSDH recurrence.
RESULTS CSDH recurrence was observed in 97(14.8%) cases. Significant distinctions were observed between recurrence and non-recurrence groups in BUN quartiles of cases ( P =0.004). After adjusting for the potential confounders, the odds ratio of recurrence was 3.124 (95%CI =1.509–6.468, p = 0.002) for the highest quartile of BUN compared with the lowest quartile. In multiple-adjusted spline regression, high BUN level visually showed significantly high OR value of recurrence risk.
CONCLUSIONS Elevated BUN at post-operation is significantly associated with the recurrence of CSDH, and it is indicated that high levels of serum BUN after evacuation may be served as a risk factor for CSDH recurrence.

Figure 1

Figure 2
This is a list of supplementary files associated with this preprint. Click to download.
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