Construction and validation of a predictive model for postoperative urinary retention after lumbar interbody fusion surgery.

BACKGROUND: Postoperative urine retention (POUR) after lumbar interbody fusion surgery may lead to recatheterization and prolonged hospitalization. In this study, a predictive model was constructed and validated. The objective was to provide a nomogram for estimating the risk of POUR and then reducing the incidence. METHODS: A total of 423 cases of lumbar fusion surgery were included; 65 of these cases developed POUR, an incidence of 15.4%. The dataset is divided into a training set and a validation set according to time. 18 candidate variables were selected. The candidate variables were screened through LASSO regression. The stepwise regression and random forest analysis were then conducted to construct the predictive model and draw a nomogram. The area under the curve (AUC) of the receiver operating characteristic (ROC) curve and the calibration curve were used to evaluate the predictive effect of the model. RESULTS: The best lambda value in LASSO was 0.025082; according to this, five significant variables were screened, including age, smoking history, surgical method, operative time, and visual analog scale (VAS) score of postoperative low back pain. A predictive model containing four variables was constructed by stepwise regression. The variables included age (ß = 0.047, OR = 1.048), smoking history (ß = 1.950, OR = 7.031), operative time (ß = 0.022, OR = 1.022), and postoperative VAS score of low back pain (ß = 2.554, OR = 12.858). A nomogram was drawn based on the results. The AUC of the ROC curve of the training set was 0.891, the validation set was 0.854 in the stepwise regression model. The calibration curves of the training set and validation set are in good agreement with the actual curves, showing that the stepwise regression model has good prediction ability. The AUC of the training set was 0.996, and that of the verification set was 0.856 in the random forest model. CONCLUSION: This study developed and internally validated a new nomogram and a random forest model for predicting the risk of POUR after lumbar interbody fusion surgery. Both of the nomogram and the random forest model have high accuracy in this study.

Current opinion: postpartum urinary disorders.

PURPOSE OF REVIEW: The aim of this study was to describe the common postpartum urinary sequelae including urinary retention and incontinence, and to summarize the management of these conditions. RECENT FINDINGS: Despite the high frequency of urinary disorders in obstetrics, screening and management protocols are rarely utilized by providers. Large variation exists in the literature regarding assessment of postpartum urinary retention, values of postvoid residuals and management of indwelling catheters in the immediate postpartum population. Recent expert guidance outlines a strategy for managing this condition.Research also highlights that screening for peripartum urinary incontinence is not a routine practice. The diagnosis is made more challenging by the fact that patients commonly understate and over-normalize their symptoms. Emerging studies have found that pelvic floor muscle training is cost-effective, preventive, and may improve symptoms in the postpartum setting. SUMMARY: Increased awareness of urinary disorders in pregnancy and postpartum is imperative for appropriate diagnosis and management. Instituting standardized voiding protocols postpartum will allow providers to avoid undiagnosed postpartum urinary retention and its repercussions. Improved screening and education regarding urinary incontinence in the peripartum is important for early management, such as pelvic floor muscle training, and improved quality of life.

[Urine retention-From the symptom to the structure]. / Harnverhalt ­ vom Symptom zur Struktur.

Urinary retention describes the inability to urinate. Based on the symptoms and the amount of the initial residual urine formation, a differentiation can be made between acute and chronic forms. The cause can be a subvesical obstruction or a bladder atony. In addition to emergency treatment in the form of initial relief of the strain on the bladder by insertion of a catheter, the indication for a definitive treatment with a clarification of the question whether an acute or chronic event is present is also important. Although the selection of the catheter is subject to few criteria, the further structured approach is complex. Both decision trees are presented in this article.

Postoperative Urinary Retention.

ABSTRACT: This clinical consensus statement on the management of postoperative (<6 weeks) urinary retention (POUR) reflects statements drafted by content experts from the American Urogynecologic Society's POUR writing group. The writing group used a modified Delphi process to evaluate statements developed from a structured literature search and assessed for consensus. After the definition of POUR was established, a total of 37 statements were assessed in the following 6 categories: (1) incidence of POUR, (2) medications, (3) patient factors, (4) surgical factors, (5) urodynamic testing, and (6) voiding trials. Of the 37 original statements, 34 reached consensus and 3 were omitted.

The Diagnostic Accuracy of a Retrograde Voiding Trial for Restoration of Spontaneous Voiding Function after Prolapse and Urinary Incontinence Surgery.

STUDY OBJECTIVE: To assess the diagnostic accuracy of a retrograde voiding trial for the restoration of spontaneous voiding function after prolapse and urinary incontinence surgery and thereby determine whether the retrograde method can be a reliable alternative to the spontaneous voiding trial. DESIGN: A retrospective cohort study. SETTING: A single tertiary hospital in South Korea. PATIENTS: Women who underwent operations for prolapse, urinary incontinence, or both. INTERVENTION: Sequential voiding trials on postoperative day 1 or 2-retrograde voiding trial followed by spontaneous voiding trial. MEASUREMENTS AND MAIN RESULTS: Of the 408 women analyzed, 278 (68.1%) passed the spontaneous voiding trial on the first day of assessment and none experienced urinary retention after a successful voiding trial. Receiver operating characteristic analyses of retrograde voiding trials evaluating voided volume (VV), postvoid residual (PVR), and voiding efficiency (VE) all demonstrated high diagnostic accuracy for restoration of spontaneous voiding function, whereas measuring PVR and VE had better discriminative ability than VV (area under the curve [95% confidence interval] = 0.93 [0.90-0.95] for PVR, 0.94 [0.91-0.96] for VE, and 0.88 [0.85-0.91] for VV; DeLong's test between PVR/VE and VV p < .01). The optimal cutoffs determined by the Youden index were 200 mL for VV (sensitivity 85.0%, specificity 78.0%), 100 mL for PVR (sensitivity 84.0%, specificity 87.0%), and 66.7% for VE (sensitivity 86.0%, specificity 88.0%). CONCLUSIONS: The retrograde voiding trial is an accurate predictor for restoration of spontaneous voiding function after prolapse and incontinence surgery and can be a useful alternative to the spontaneous voiding trial.

Pre-operative prediction of post-operative urinary retention in lumbar surgery: a prospective validation of machine learning model.

PURPOSE: Predicting urinary retention is difficult. The aim of this study is to prospectively validate a previously developed model using machine learning techniques. METHODS: Patients were recruited from pre-operative clinic. Prediction of urinary retention was completed pre-operatively by 4 individuals and compared to ground truth POUR outcomes. Inter-rater reliability was calculated with intercorrelation coefficient (2,1). RESULTS: 171 patients were included with age 63 ± 14 years, 58.5% (100/171) male, BMI 30.4 ± 5.9 kg/m2, American Society of Anesthesiologists class 2.6 ± 0.5, 1.7 ± 1.0 levels, 56% (96/171) fusions. The observed rate of POUR was 25.7%. The model's performance was found to be 0.663 (0.567-0.759). With a regression model probability cutoff of 0.24 and a neural network cutoff of 0.23, the following predictive power was achieved: specificity 90.6%, sensitivity 22.7%, negative predictive value 77.2%, positive predictive value 45.5%, and accuracy 73.1%. Intercorrelation coefficient for the regression aspect of the model was found to be 0.889 and intercorrelation coefficient for the neural network aspect of the model was found to be 0.874. CONCLUSIONS: This prospective study confirms performance of the prediction model for POUR developed with retrospective data, showing great correlation. This supports the use of machine learning techniques in the prediction of postoperative complications such as urinary retention.

6.2 l of residual urine without recognized pathology in the urinary tract before knee arthroplasty.

This is a rare case report in an elective orthopaedic setting, in which a 72-year-old man without known urologic disorders presented with a 6.2 l post-void residual urine (PVR) before a planned knee arthroplasty surgery. The PVR was found because of a newly established local guideline in an orthopaedic department regarding examination and treatment for PVR. The guideline was made in collaboration with urologists to improve the quality of treatment. Early diagnosis and treatment may prevent chronic bladder injury, urinary tract infections, urosepsis and kidney damage.

Assessment of patient satisfaction with home vs office indwelling catheter removal placed for urinary retention after female pelvic floor surgery: a randomized controlled trial.

BACKGROUND: Postoperative urinary retention is burdensome for patients. We seek to improve patient satisfaction with the voiding trial process. OBJECTIVE: This study aimed to assess patient satisfaction with location of indwelling catheter removal placed for urinary retention after urogynecologic surgery. STUDY DESIGN: All adult women who were diagnosed with urinary retention requiring postoperative indwelling catheter insertion after undergoing surgery for urinary incontinence and/or pelvic organ prolapse were eligible for this randomized controlled study. They were randomly assigned to catheter removal at home or in the office. Those who were randomized to home removal were taught how to remove the catheter before discharge, and were discharged home with written instructions, a voiding hat, and 10-mL syringe. All patients had their catheter removed 2 to 4 days after discharge. Those patients who were allocated to home removal were contacted in the afternoon by the office nurse. Subjects who graded their force of urine stream 5, on a scale of 0 to 10, were considered to have safely passed their voiding trial. For patients randomized to the office removal group, the voiding trial consisted of retrograde filling the bladder to maximum they could tolerate up to 300 mL. Urinating >50% of instilled volume was considered successful. Those who were unsuccessful in either group had catheter reinsertion or self-catheterization training in the office. The primary study outcome was patient satisfaction, measured based on patients' response to a question, "How satisfied were you with the overall removal process of the catheter?" A visual analogue scale was created to assess patient satisfaction and 4 secondary outcomes. A sample size of 40 participants per group were needed to detect a 10 mm difference in satisfaction between groups on the visual analogue scale. This calculation provided 80% power and an alpha of 0.05. The final number accounted for 10% loss to follow up. We compared the baseline characteristics, including urodynamic parameters, relevant perioperative indices, and patient satisfaction between the groups. RESULTS: Of the 78 women enrolled in the study, 38 (48.7%) removed their catheter at home and 40 (51.3%) had an office visit for catheter removal. Median and interquartile range for age, vaginal parity, and body mass index were 60 (49-72) years, 2 (2-3), and 28 (24-32) kg/m2, respectively, in the overall sample. Groups did not differ significantly in age, vaginal parity, body mass index, previous surgical history, or type of concomitant procedures. Patient satisfaction was comparable between the groups, with a median score (interquartile range) of 95 (87-100) in the home catheter removal group and 95 (80-98) in the office catheter removal group (P=.52). Voiding trial pass rate was similar between women who underwent home (83.8%) vs office (72.5%) catheter removal (P=.23). No participants in either group had to emergently come into the office or hospital due to inadequate voiding afterwards. Within 30 days post operatively, a lower proportion of women in the home catheter removal group (8.3%) had urinary tract infection, compared to patients in the office catheter removal group (26.3%) (P=.04). CONCLUSION: In women with urinary retention after urogynecologic surgery, there is no difference in satisfaction concerning the location of indwelling catheter removal when comparing home and office.

A guide to diagnosing and treating benign prostatic hypertrophy.

Benign prostatic hypertrophy (BPH) is a condition where the prostate becomes enlarged. It affects all men and is part of the ageing process. Globally, the incidence rates of BPH have risen by 70% between 2000-2019. When left untreated, it can lead to acute urinary retention, impaired bladder emptying, urinary tract infections, bladder stones, kidney failure or gross haematuria. In this article, Linda Nazarko describes the causes and consequences of BPH along with treatment options that are available for it.

Urinary Retention Suggesting Aseptic Meningitis: Meningitis-Retention Syndrome Without Physical Signs of Meningeal Irritation.

Meningitis-retention syndrome (MRS) is the combination of aseptic meningitis and acute urinary retention that occurs in the absence of other neurological diseases. The cause(s) of MRS remain unclear. A 57-year-old Japanese woman was referred to our hospital for the evaluation of persistent fever and headache. The fever's cause was initially unclear, but the presence of urinary retention raised concern about possible aseptic meningitis despite no physical indications of meningeal irritation. Only typical cases of MRS have been reported thus far to our knowledge, and it is important that clinicians are aware of MRS when it presents in this atypical form.

Meningitis-retention syndrome: a review and update of an unrecognized clinical condition.

OBJECTIVES: We summarized the clinical and radiological characteristics of meningitis-retention syndrome (MRS), its therapeutic options, and urological outcome, to better understand the pathogenesis of this syndrome and to evaluate the effectiveness of corticosteroids in reducing the period of urinary retention. METHODS: We reported a new case of MRS in a male adolescent. We also reviewed the previously 28 reported cases of MRS, collected from inception up to September 2022. RESULTS: MRS is characterized by aseptic meningitis and urinary retention. The mean length of the interval between the onset of the neurological signs and the urinary retention was 6.4 days. In most cases, no pathogens were isolated in cerebrospinal fluid, except for 6 cases in which Herpesviruses were detected. The urodynamic study resulted in a detrusor underactivity, with a mean period for urination recovery of 4.5 weeks, regardless of therapies. DISCUSSION: Neurophysiological studies and electromyographic examination are not pathological, distinguishing MRS from polyneuropathies. Although there are no encephalitic symptoms or signs, and the magnetic resonance is often normal, MRS may represent a mild form of acute disseminated encephalomyelitis, without radiological detectable medullary involvement, due to the prompt use of steroids. It is believed that MRS is a self-limited disease, and no evidence suggests the effectiveness of steroids, antibiotics, and antiviral treatment in its clinical course.

[Urine retention-From the symptom to the structure]. / Harnverhalt ­ vom Symptom zur Struktur.

Urinary retention describes the inability to urinate. Based on the symptoms and the amount of the initial residual urine formation, a differentiation can be made between acute and chronic forms. The cause can be a subvesical obstruction or a bladder atony. In addition to emergency treatment in the form of initial relief of the strain on the bladder by insertion of a catheter, the indication for a definitive treatment with a clarification of the question whether an acute or chronic event is present is also important. Although the selection of the catheter is subject to few criteria, the further structured approach is complex. Both decision trees are presented in this article.

Postpartum urinary retention: an expert review.

Postpartum urinary retention is a relatively common condition that can have a marked impact on women in the immediate days following childbirth. If left untreated, postpartum urinary retention can lead to repetitive overdistention injury that may damage the detrusor muscle and the parasympathetic nerve fibers within the bladder wall. In rare circumstances, postpartum urinary retention may even lead to bladder rupture, which is a potentially life-threatening yet entirely preventable complication. Early diagnosis and timely intervention are necessary to decrease long-term consequences. There are 3 types of postpartum urinary retention: overt, covert, and persistent. Overt retention is associated with an inability to void, whereas covert retention is associated with incomplete bladder emptying. Persistent urinary retention continues beyond the third postpartum day and can persist for several weeks in rare cases. Recognition of risk factors and prompt diagnosis are important for proper management and prevention of negative sequelae. However, lack of knowledge by providers and patients alike creates barriers to accessing and receiving evidence-based care, and may further delay diagnosis for patients, especially those who experience covert postpartum urinary retention. Nationally accepted definitions and management algorithms for postpartum urinary retention are lacking, and development of such guidelines is essential for both patient care and research design. We propose intrapartum recommendations and a standardized postpartum bladder management protocol that will improve patient outcomes and contribute to the growing body of evidence-based practice in this field.

[Urinary retention in young female patients]. / Blasenentleerungsstörung bei jungen Patientinnen.

INTRODUCTION: This practice case describes a 28-year-old female patient suffering from unclear residual urine formation. Urogynecologic examination reveals a severely hypercapacitated bladder with atonic detrusor. After ruling out other gynecologic and neurologic differential diagnoses, the diagnosis of Fowler syndrome was made. This is a painless residual urine formation with typical pelvic floor EMG with detrusor sphincter dyscoordination. Causal therapies do not exist. Sacral neuromodulation, percutaneous tibial nerve stimulation, or intermittent self-catheterization.

Immediate versus early (24-hours) urinary catheter removal after elective minimally invasive colonic resection: study protocol for a randomized, multicenter, non-inferiority trial.

BACKGROUND: Enhanced Recovery After Surgery (ERAS) represents the standard of care in colorectal surgery. Among ERAS items, early removal of urinary catheter (UC) is considered a key issue, though adherence to this specific item still varies among centers. UC placement allows for monitoring of post-operative urinary output but relates to an increased risk of urinary tract infection (UTI), reduced mobility, and patient's discomfort. Several studies investigated the role of early UC removal specifically looking at the rate of acute urinary retention (AUR) but most of them were retrospective, single-center, underpowered, cohort studies. The main purpose of this study is to compare the rate of AUR after immediate (at the end of the surgery) versus early (within 24 h from the completion of surgery) removal of UC in patients undergoing minimally invasive colonic resection (MICR). The secondary outcomes focus on goals that could be positively impacted by the immediate removal of the UC at the end of the surgery. In particular, the rate of UTIs, perception of pain, time-to-return of bowel and physical functions, postoperative complications, and length of hospital stay will be measured. METHODS: This is a prospective, randomized, controlled, two-arm, multi-center, study comparing the rate of AUR after immediate versus early removal of UC in patients undergoing MICR. The investigators hypothesize that immediate UC removal is non-inferior to 24-h UC removal in terms of AUR rate. Randomization is at the patient level and participants are randomized 1:1 to remove their UC either immediately or within 24 h from the completion of surgery. Those eligible for inclusion were patients undergoing any MICR with an anastomosis above the peritoneal reflection. Those patients who need to continue urinary output monitoring after the surgery will be excluded. The number of patients calculated to be enrolled in each group is 108 based on an expected AUR rate of 3% for the 24-h UC removal group and considering acceptable an AUR of 9% for the immediate UC removal group. DISCUSSION: The demonstration of a non-inferiority of immediate versus 24-h removal of UC would call into question the usefulness of urinary drainage in the setting of MICR. TRIAL REGISTRATION: ClinicalTrials.gov NCT05249192. Prospectively registered on February 21, 2022.

The voiding VAS score is a simple and useful method for predicting POUR after laparoscopy for benign gynaecologic diseases: a pilot study.

The aim of this study was to identify an appropriate scoring system for predicting postoperative urinary retention (POUR) after gynaecological laparoscopic surgery for benign disease. We analysed 99 patients who underwent gynaecological laparoscopic surgery for benign disease. All patients were asked to complete self-administered questionnaires, including the International Prostate Symptom Score (IPSS), voiding visual analogue scale (VAS), and Brief Pain Inventory-Korean version. Of the 99 patients, 27 (27.3%) experienced urinary retention at least once, while 72 (72.7%) did not. The preoperative and postoperative IPSS scores were not associated with the development of POUR. However, the voiding VAS score was significantly lower in patients that developed POUR (p = .014). In conclusion, our results show that the voiding VAS score is a simple and useful method for identifying patients at risk of POUR after gynaecologic laparoscopic surgery for benign disease. IMPACT STATEMENTWhat is already known on this subject? Postoperative urinary retention (POUR) is an often underestimated complication defined as inability to void during the postoperative period despite a full bladder. Undetected POUR may lead to complications such as urinary tract infection, bladder distention, and bladder dysfunction. Routine assessment of POUR by bladder ultrasonography in all surgical patients places a larger workload on the nursing staff.What do the results of this study add? Among the self-scoring assessment tools, the voiding VAS provided the most accurate reflection of POUR in patients undergoing gynaecologic laparoscopic surgery for benign disease.What are the implications of these findings for clinical practice and/or further research? As laparoscopy is the most widely employed surgical procedure in gynaecology, our findings could have significant implications for postoperative care in daily clinical practice.

The efficacy of force of stream assessment for post-operative catheter management: a retrospective cohort study.

INTRODUCTION AND HYPOTHESIS: Postoperative urinary retention is common after urogynecologic procedures. Our objective is to determine the efficacy of force of stream (FOS) assessment without a visual analog scale for postoperative catheter management. METHODS: We conducted a retrospective cohort study of 110 women undergoing an inpatient gynecologic procedure. They were asked to subjectively assess FOS after surgery without a visual analog scale. If it was 50% or better than the usual preoperative void, they were discharged home without a catheter. If < 50%, the catheter was replaced and the patients were sent home and asked to follow up in 3 to 5 days for another void trial. RESULTS: Average age was 56.9 ± 10.2 years; 63.6% underwent surgery for pelvic organ prolapse, 23.6% underwent sling for urinary incontinence, and 12.7% underwent a combination of both. Force of stream was > 50% in 93.6% of the patients; 6.4% had force of stream < 50% and hence were discharged home with a Foley catheter. Only two patients (1.8%) were discharged without a Foley catheter and returned to the emergency department for signs of urinary retention. Sensitivity, specificity, positive and negative predictive values were 77.8%, 100%, 100% and 98.1%, respectively. CONCLUSION: The subjective assessment of flow of stream is a reliable and safe method to assess postoperative voiding. Given it is less invasive than backfilling the bladder and easier than using a bladder scan, it should be the primary method to assess postoperative voiding.

Acute urinary retention.

Acute urinary retention is a common clinical presentation in emergency departments in the UK and is responsible for over 30 000 hospital admissions annually. Awareness of the latest advice and guidelines regarding its presentation, investigation and management is paramount to improve patient outcomes and reduce morbidity. Immediate management of acute urinary retention relies on timely bladder decompression by catheterisation. Knowledge of the routes and types of catheterisation, including the associated risks, complications and contraindications, is essential to allow rapid and early intervention, thus preventing further complications. Differences in the presentation of patients with acute urinary retention reflect varying aetiologies, the knowledge of which determines long-term management and prognosis.