[Validity and reliability of bladder ultrasound imaging for noninvasive estimation of urine volume in a major outpatient surgery department]. / Validez y fiabilidad de la ecografía vesical en la estimación no invasiva del volumen de orina en una Unidad de cirugía mayor ambulatoria.

OBJECTIVE: To assess the validity and reliability of bladder ultrasound imaging for noninvasive estimation of urine volume, residual volume after voiding, volume before anesthetic induction and after surgery, and volume on sensing an urge to void. PATIENTS AND METHODS: Study of a prospective series of 47 ASA 1-3 patients aged 18 to 79 years undergoing major outpatient surgical procedures under general anesthesia (n = 24) or regional anesthesia and sedation (n = 23). Urine volume was measured at baseline and on recovery (bladder volume by ultrasound and voided volume in a flask) and at the end of surgery (ultrasound only). The reliability and validity of the ultrasound estimation was calculated. RESULTS: Agreement (intraclass correlation coefficient [ICC]) between 4 ultrasound-image estimations at baseline and the measured amount collected in a flask ranged from 0.70 to 0.86. The inter- and intra-measurement reliability was high, with ICC values greater than 0.80. The median error of estimation by ultrasound, with respect to measurement in the flask, was 23% at baseline and 29% after recovery. The amount in the flask was greater. CONCLUSIONS: Ultrasound monitoring of urine in the bladder is reliable and valid, particularly for small volumes. The procedure is tolerated by patients.

Validez y fiabilidad de la ecografía vesical en la estimación no invasiva del volumen de orina en una Unidad de cirugía mayor ambulatoria / Validity and reliability of bladder ultrasound imaging for noninvasive estimation of urine volume in a major outpatient surgery department

OBJETIVOS: Evaluar la validez y fiabilidad de la ecografíavesical en la estimación no invasiva del volumende orina y del volumen residual postmiccional, antes dela inducción anestésica, tras la intervención y al sentirnecesidad de orinar.PACIENTES Y MÉTODOS: Serie prospectiva de 47 pacientesASA I-III, de 18 a 79 años de edad, intervenidos enrégimen de cirugía mayor ambulatoria y sometidos aanestesia general (24) o a anestesia regional y sedación(23). Se midió el volumen de orina mediante ecografía yen matraz en los tiempos basal y postquirúgico, medianteecografía en el postquirúrgico inmediato. Se estimaronla fiabilidad y la validez de las mediciones.RESULTADOS: La concordancia entre las cuatro tomasbasales realizadas con el ecógrafo en el primer tiempo yentre cada una de ellas, con las determinaciones delmatraz oscila entre 0,70 y 0,86 (coeficiente de correlaciónintraclase). La fiabilidad inter e intramedida es elevada,con coeficientes de correlación intraclase superiores a0,80. Las medianas de error entre el volumen medido conel ecógrafo y con el matraz, en el momento basal y en lareadaptación, fueron del 23 y el 29% a favor del volumenmedido con el matraz.CONCLUSIONES: La monitorización por ultrasonidos delcontenido vesical es un método fiable y válido, especialmentepara volúmenes pequeños, y aceptado por lospacientes(AU)

OBJECTIVE: To assess the validity and reliability ofbladder ultrasound imaging for noninvasive estimationof urine volume, residual volume after voiding, volumebefore anesthetic induction and after surgery, and volumeon sensing an urge to void.PATIENTS AND METHODS: Study of a prospective series of47 ASA 1-3 patients aged 18 to 79 years undergoing majoroutpatient surgical procedures under general anesthesia (n= 24) or regional anesthesia and sedation (n = 23). Urinevolume was measured at baseline and on recovery (bladdervolume by ultrasound and voided volume in a flask)and at the end of surgery (ultrasound only). The reliabilityand validity of the ultrasound estimation was calculated.RESULTS: Agreement (intraclass correlation coefficient[ICC]) between 4 ultrasound-image estimations at baselineand the measured amount collected in a flask rangedfrom 0.70 to 0.86. The inter- and intra-measurement reliabilitywas high, with ICC values greater than 0.80. Themedian error of estimation by ultrasound, with respect tomeasurement in the flask, was 23% at baseline and 29%after recovery. The amount in the flask was greater.CONCLUSIONS: Ultrasound monitoring of urine in thebladder is reliable and valid, particularly for small volumes.The procedure is tolerated by patients(AU)