RESUMO
BACKGROUND AND AIMS: Adequate bowel preparation (BP) is crucial for the diagnosis of colorectal diseases. Identifying patients at risk of inadequate BP allows for targeted interventions and improved outcomes. We aimed to develop a model for predicting inadequate BP based on preparation-related factors. METHODS: Adult outpatients scheduled for colonoscopy between May 2022 and October 2022 were enrolled. One set (N = 913) was used to develop and internally validate the predictive model. The primary predictive model was displayed as a nomogram and then modified into a novel scoring system, which was externally validated in an independent set (N = 177). Inadequate BP was defined as a Boston Bowel Preparedness Scale (BBPS) score of less than 2 for any colonic segment. The model was evaluated by the receiver operating characteristic (ROC) curve, calibration plots, and decision curve analysis (DCA). RESULTS: Independent factors included in the prediction model were stool frequency ≤ 5 (15 points), preparation-to-colonoscopy interval ≥ 5 h (15 points), incomplete dosage (100 points), non-split dose (90 points), unrestricted diet (88 points), no additional water intake (15 points), and last stool appearance as an opaque liquid (0-80 points). The training set exhibited the following performance metrics for identifying BP failure: area under the curve (AUC) of 0.818, accuracy (ACC) of 0.818, positive likelihood ratio (PLR) of 2.397, negative likelihood ratio (NLR) of 0.162, positive predictive value (PPV) of 0.850, and negative predictive value (NPV) of 0.723. In the internal validation set, these metrics were 0.747, 0.776, 2.099, 0.278, 0.866, and 0.538, respectively. The external validation set showed values of 0.728, 0.757, 2.10, 0.247, 0.782, and 0.704, respectively, indicating strong discriminative ability. Calibration curves demonstrated close agreement, and DCA indicated superior clinical benefits at a threshold probability of 0.73 in the training cohort and 0.75 in the validation cohort for this model. CONCLUSIONS: This novel scoring system was developed from a prospective study and externally validated in an independent set based on 7 easily accessible variables, demonstrating robust performance in predicting inadequate BP.
Assuntos
Colonoscopia , Nomogramas , Humanos , Feminino , Masculino , Pessoa de Meia-Idade , Colonoscopia/métodos , Idoso , Adulto , Curva ROC , Catárticos/administração & dosagemRESUMO
Background: Anterograde mechanical colon cleansing is routinely done before colorectal surgery. However there is no firm evidence about its usefulness. Aim: To assess the usefulness of anterograde mechanical colon cleansing in colon surgery. Patients and Methods: Participants requiring elective colorectal surgery were randomized to receive anterograde mechanical bowel cleansing with two doses of oral sodium phosphate (Oral fleet) or a liquid diet 24 hours prior to surgery, after signing an informed consent. Both groups received antimicrobial prophylaxis. Problems associated with bowel cleansing, subjective assessment of bowel preparation by the surgeon and postoperative complications were recorded. Results: One hundred twenty two participants were studied (73 females). Fifty three percent of patients had concomitant diseases such as hypertension and diabetes mellitus. Sixty patients were subjected to anterograde bowel cleansing and 62 were ascribed to the liquid diet group. Surgeons evaluated colon cleansing as good in 49 and 37 patients with and without anterograde mechanical cleansing, respectively and as regular in 8 and 23 patients, respectively (X2 = 9.1 p = 0.01). Tolerance to cleansing was evaluated as good, fair and poor by 50, 30 and 20 percent of patients, respectively. One patient had a bowel obstruction associated with the use of sodium phosphate. Postoperative complications occurred in 14 and 23 patients subjected or not to cleansing, respectively (p = 0.06). Septic complications occurred in 11 and 3 cases with and without colon cleansing, respectively (p < 0.01). Conclusions: Anterograde mechanical colon cleansing was associated with a higher incidence of septic complications in this series of patients.
Introducción: El uso de la preparación mecánica anterógrada (PMA) es una práctica rutinaria en cirugía colorrectal pero con escasas bases en la evidencia científica. Objetivo: Determinar la utilidad de la PMA en una serie prospectiva y aleatoria de cirugía colorrectal electiva. Resultados: La serie corresponde a 122 pacientes, 60 de los cuales recibe PMA. Los datos epidemiológicos muestran que los grupos son comparables. En esta serie se encuentra un riesgo de morbilidad global aumentado al doble en los pacientes que reciben PMA, así como un riesgo de infección superficial del sitio quirúrgico seis veces mayor. No se encuentran diferencias en las infecciones profundas, dehiscencia de anastomosis ni en las reintervenciones. Las complicaciones asociadas a la PMA se presentaron sólo en un caso, 10 que no alcanza significación estadística. Conclusiones: De acuerdo a nuestros resultados, no se justifica la utilización rutinaria de PMA.