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Antenatal Hydronephrosis
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Definition: AP diameter renal pelvis > 4mm @ 20 wk EGA AP diameter renal pelvis > 7mm @ 30 wk EGA Incidence: 5% of pregnancies
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Antenatal Hydronephrosis Standard work-up: –Postnatal ultrasound Look for –AP diameter –Calyceal/ureteral dilation –Renal size –Corticomedullary differentiation –Thinned/hyperechoic cortex –Cortical cysts –Ureterocele –Ectopic ureteral insertion Best after first 24 hours of life/when not volume depleted
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ANH: Work-up (cont.) –VCUG Vesicoureteral reflux Posterior urethral valves Ureterocele –Antibiotics (Amoxicillin 10mg/kg/day) until VCUG done (and normal)
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Is a VCUG Necessary? Ismaili et al., Journal of Pediatrics, June 2004 –258 pts with ANH –81 w/u WNL –49 uncomplicated duplication or dilation resolved –83 with significant findings 27 UPJ 23 primary VUR 15 primary megaureter 10 complicated duplication (ureterocele/ectopic ureter) 3 MCDK 2 posterior urethral valves 2 horseshoe kidney 1 renal dysplasia
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Ismaili Article Continued Normal postnatal US 3% abnormal VCUG AP diameter 7-10mm -- 64% had significant findings AP diameter >10mm -- 100% had significant findings Recommends no VCUG if US wnl This is in sharp contrast to several earlier studies
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Phan, et al., Pediatric Nephrology, October 2003 68/111 pts with ANH and AP diameter <10mm (including several wnl) 16 (24%) had VUR
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Anderson, et al., Pediatric Nephrology, November 1997 Postnatal renal sonogram could not predict presence of VUR in pts with AP diameter >4mm antenatally 9% of pts with nl postnatal US had VUR
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Farhat, et al., Journal of Urology, September 2000 27 % of pts with VUR (w/u prompted by ANH) had a normal postnatal RBUS
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Herndon, et al., Journal of Urology, September 1999 Of pts later dx’d with VUR (as part of ANH w/u) 88% had AP diameter <10mm 25% had nl postnatal RBUS Only 26 ureters (of 112 refluxing units) dilated on RBUS
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Radiology 1993 25% of patients with ANH and nl postnatal RBUS had VUR on VCUG
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Breakdown of postnatal dx 60%--normal 25%--UPJ (includes those that require no intervention) 15%--VUR 1-2% other (diagnoses may overlap)
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When to get an IVP/Mag 3 More reliable results after 8-12 weeks of life Mag 3 nuclear renogram preferred Most algorithms now are based on delayed T ½ on nuclear renogram and changes in differential function
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Mag 3 Nuclear Renogram with Lasix Washout AP diameter >10mm After 12 weeks of life Differential function Drainage (measured as time to drainage of ½ volume of renal pelvis from administration of Lasix [or peak of tracer]), but the actual image may be more revealing, depending on region of interest drawn
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When to intervene Differential function < 40% Progressive decrease in differential function on sequential nuclear renograms
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Onen, Jayanthi, and Koff. Journal of Urology. September 2002 Looks at bilateral Initial evaluation: US, nuclear renogram, serum creatinine 13/38 kidneys required pyeloplasty— criteria: worsening hydronephrosis, decrease in relative function >10% Mean time to maximal improvement by US post-op 14 months in operated group 10 months in nonoperative group
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Other Reasons for Intervention Symptomatic –Failure to thrive –UTI
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IVP Megaureter Persistence of AP diameter >10mm, but preserved function at one year
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DMSA Multicystic Dysplastic Kidney Assure that there is no function before abandoning kidney 42% of kidneys dx’d as MCDK kidneys antenatally are actually hydronephrosis/UPJ obstruction
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Conclusions Most diagnoses made based on a finding of prenatal hydronephrosis can be handled conservatively. However, until we have better ways to predict who will require intervention, a complete work-up, including RBUS and VCUG is warranted in all pts with an AP renal diameter >4mm prenatally.
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Urinary Tract Infections in Children Incidence –Neonates: M > F –Thereafter: F > M
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Organisms Enterobacteriaciae –Escherichia (80%) –Klebsiella –Enterobacter –Citrobacter –Proteus –Providencia –Morganella –Serratia –Salmonella
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Other Organisms Pseudamonas Staphylococcus Enterobacter
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Risk Factors Perineal colonization Family hx Presence of a prepuce –10x risk –Periurethral colonization—circ eliminates this –Adherence of P fimbriated E. coli to prepuce Urethral length Urine pH (6-7 favors growth) Urine concentration—dilute has less nutrients Dysfunctional elimination
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Risk Factors— Dysfunctional Elimination Residual urine Increased intravesical pressure Bladder overdistension Constipation –24% day wetters –34% night wetters 90% of pts with UTI and no structural anomalies had dysfunctional elimination
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Not Risk Factors Bubble baths Improper wiping
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Risk Factors Upper Tract Infections Antigen P1 blood group receptors Vesicoureteral Reflux –25-50% of patients with pyelonephritis have VUR –Less virulent strains of E. coli can cause pyelo inpatients with VUR Obstruction Heredity
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Presentation Nonverbal Patient –Irritability –Poor feeding –Failure to thrive –Vomiting –Diarrhea –Fever Verbal Patient –Urgency –Frequency –Enuresis –Dysuria –Fever
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Diagnosis Urine Culture is ABSOLUTELY NECESSARY Symptoms are not enough History is not enough Of patients with dysuria, urgency, frequency, enuresis 18% had + UCX, 40% had URI (yes, respiratory infection!) Local symptoms could be the same with vulvitis, urethritis, dysfunctional voiding, dehydration
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Urine Cultures Bagged specimens are only valuable when negative Voided, midstream catch Catheterized best, and necessary in the pre-potty training age, especially if there is a fever and the diagnosis of UTI is going to lead to further testing
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Diagnosis UA –WBC 70% reliable –Bacteria on a centrifuged urine UTI if WBC>10/mL & UCx >50k cfu/mL Dipstick LE 52.9%, Nitrite 31.4% sensitive Nitrites require 4hrs of bacterial incubation to be + LE may give false positive after prolonged exposure to air
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Level of Infection Cystitis –Symptoms Dysuria Frequency Urgency 2 o enuresis Usually no systemic symptoms
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Level of Infection Pyelonephritis –Fever –Flank pain –Pyuria –UCx positive –Elevated serum WBC, ESR, CRP
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Asymptomatic Bacteruria Positive urine culture No urinary symptoms Only 4% later progress to symptomatic infection The organism may be commensal and protective to prevent infection with a more virulent organism In the absence of VUR, no treatment necessary, but look for voiding dysfunction
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Pyelonephritis (continued Diagnosis: UCx and pyuria, but DMSA to be absolutely certain (in the first several days of symptoms) Risks from episodes of pyelo –Focal ischemia –Inflammatory changes –Renal scarring –Hypertension –Renal insufficiency
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Treatment Lower Tract (no fever) –Treat 3-5 days –Start with TMP-SMX, nitrofurantoin or cephalosporin –Amoxil may change gut flora and lead to future infections with resistant organisms –FQ ok if there is no other oral agent to use
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Treatment Pyelonephritis –Treat 10-14 days –Start with Bactrim of Cephalosporin until culture is back –Hospitalization in severe cases Abscess –UCx may be negative –Parenteral abx x 10 days then 14d oral therapy
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Work-up after a UTI Who? –Fever or documented pyelonephritis –<5yo What –RBUS (prior to discharge & yes, kidneys & bladder) –VCUG once afebrile –DMSA Prophylactic antibiotics until work-up
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Prophylaxis Vesicoureteral reflux No Reflux, but <1yo –30-75% recurrence in the first year Frequent symptomatic UTIs
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