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Is Hydronephrosis a Complication after Anterior Lumbar Surgery?

ABSTRACT: Study Design Prospective follow-up design. Objective Ureteral injury is a recognized complication following gynecologic surgery and can result in hydronephrosis. Anterior lumbar surgery includes procedures like anterior lumbar interbody fusion (ALIF) and total disk replacement (TDR). Anterior approaches to the spine require mobilization of the great vessels and visceral organs. The vascular supply to the ureter arising from the iliac arteries may be compromised during midline retraction of the ureter, which could theoretically lead to ureter ischemia and stricture with subsequent hydronephrosis formation. Methods Potential candidates with previous ALIF or TDR via anterior retroperitoneal access between January 2008 and March 2012 were chosen from those operated on by a single surgeon in a university hospital setting (n = 85). Renal ultrasound evaluation of hydronephrosis was performed on all participants. Simple descriptive and inferential statistics were used to generate results. Results A total of 37 voluntary participants were recruited (23 male, 14 female subjects; average age 51.8 years). The prevalence of hydronephrosis in our population was 0.0% (95% confidence interval 0 to 8.1%). Conclusions Retraction of the ureter across the midline in ALIF and TDR does not result in an increase in hydronephrosis and appears to be a safe surgical technique.

SUBMITTER: Parks RM

PROVIDER: S-EPMC4671910 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Study designMultivariate analysis of prospectively collected registry data.ObjectiveUsing multivariate analysis to determine significant risk factors for medical complication after lumbar spine surgery.Summary of background dataSeveral studies have examined the occurrence of medical complication after spine surgery. However, many of these studies have been done utilizing large national databases. Although these allow for analysis of thousands of patients, potentially influential covariates are not accounted for in these retrospective studies. Furthermore, the accuracy of these retrospective data collection in these databases has been called into question.MethodsThe Spine End Results Registry (2003–2004) is a collection of prospectively collected data on all patients who underwent spine surgery at our two institutions. Extensive demographic and medical information were prospectively recorded as described previously by Mirza et al. Complications were defined in detail a priori and were prospectively recorded for at least 2 years after surgery. We analyzed risk factors for medical complication after lumbar spine surgery using univariate and multivariate analysis.ResultsWe analyzed data from 767 patients who met out inclusion criteria. The cumulative incidences of complication after lumbar spine surgery per organ system are as follows: cardiac, 13%; pulmonary, 7%; gastrointestinal, 6.7%; neurological, 8.2%; hematological, 17.5%; and urologic complications, 10.3%. The occurrence of cardiac or respiratory complication after lumbar spine surgery was significantly associated with death within 2 years (relative risk: 6.09 and 10.9, respectively). Several significant risk factors were identified for organ-specific complications. Among these, surgical invasiveness appeared to be the largest risk factor for cardiac, pulmonary, neurological, and hematological complications.ConclusionRisk factors identified in this study can be beneficial to clinicians and patients alike when considering surgical treatment of the lumbar spine. Future analyses and models that predict the occurrence of medical complication after lumbar spine surgery may be of further benefit for surgical decision making.

Project description:Cross-sectional study with prospective recruitment.To determine the relationship of pain intensity (back and leg) on patients' acceptance of surgical complication risks when deciding whether or not to undergo lumbar spinal fusion.To formulate informed decisions regarding lumbar fusion surgery, preoperative discussions should include a review of the risk of complications balanced with the likelihood of symptom relief. Pain intensity has the potential to influence a patient's decision to consent to lumbar fusion. We hypothesized that pain intensity is associated with a patient's acceptance of surgical complication risks.Patients being seen for the first time by a spine surgeon for treatment of a nontraumatic or non-neoplastic spinal disorder completed a structured questionnaire. It posed 24 scenarios, each presenting a combination of risks of 3 complications (nerve damage, wound infection, and nonunion) and probabilities of symptom relief. For each scenario, the patient indicated whether he or she would or would not consent to a fusion for low back pain (LBP). The sum of the scenarios in which the patient responded that he or she would elect surgery was calculated to represent acceptance of surgical complication risks. A variety of other data were also recorded, including age, sex, education level, race, history of nonspinal surgery, duration of pain, and history of spinal injections. Data were analyzed using bivariate and multivariate regression analyses.The mean number of scenarios accepted by 118 enrolled subjects was 10.2 (median, 8; SD, 8.5; range, 0-24, or 42.5% of scenarios). In general, subjects were more likely to accept scenarios with lower risks and higher efficacy. Spearman rank correlation estimates demonstrated a moderate association between the LBP intensity and acceptance of surgical complication risks (r = 0.37, P = 0.0001) whereas leg pain intensity had a weak but positive correlation (r = 0.19, P = 0.04). In bivariate analyses, a history of spinal injections was strongly associated with patients' acceptance of surgical complication risks and willingness to proceed with surgery (54.5% of scenarios accepted for those who had a history of spinal injections vs. 27.6% for those with no history of spinal injections, P = 0.0001). White patients were more willing to accept surgery (45.9% of scenarios) than non-white patients (28.4%, P = 0.03). With the available numbers, age, sex, history of nonspinal surgery, education, and the duration of pain demonstrated no clear association with acceptance of surgical complication risks. Although education overall was not an influential factor, more educated males had greater risk tolerance than less educated males whereas more educated females had less risk tolerance than less educated females (P = 0.023). In multivariate analysis, LBP intensity remained a highly statistically significant correlate (P = 0.001) of the proportion of scenarios accepted, as did a history of spinal injections (P = 0.001) and being white (0.03).The current investigation indicates that the intensity of LBP is the most influential factor affecting a patient's decision to accept risk of complication and symptom persistence when considering lumbar fusion. This relationship has not been previously shown for any surgical procedure. These data could potentially change the manner in which patients are counseled to make informed choices about spinal surgery. With growing interest in adverse events and complications, these data could be important in establishing guidelines for patient-directed surgical decision making.

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Is Hydronephrosis a Complication after Anterior Lumbar Surgery?

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