Overview
Acute pyelonephritis is a severe form of urinary tract infection characterized by inflammation of the renal parenchyma, often leading to significant morbidity including potential kidney scarring and acute renal failure 124.Diagnosis
Clinical signs include fever, flank pain, and systemic toxicity 1.
Urinalysis typically shows pyuria and bacteriuria 1.
Imaging studies (e.g., ultrasound, CT scan) help confirm diagnosis and assess complications like hydronephrosis 3.
Renal scintigraphy can evaluate for kidney scarring post-infection 1.Management
First-line treatment: Intravenous antibiotics targeting the causative organism (e.g., fluoroquinolones, cephalosporins) 12.
Supportive care: Hydration, pain management, and monitoring for complications 2.
Adjunctive therapy: Dexamethasone (0.30 mg/kg/day intravenously twice daily for 3 days) may be considered to prevent kidney scarring in pediatric patients, though evidence is moderate 1 (Evidence: Moderate).
Surgical intervention: Percutaneous nephropyelostomy recommended for severe cases with acute pyohydronephrosis 3 (Evidence: Weak).Special Populations
Pediatrics: Dexamethasone use explored for reducing kidney scarring; further studies needed 1 (Evidence: Moderate).
Comorbidities: Patients with alcoholism may have increased risk of renal papillary necrosis and poor renal recovery 2 (Evidence: Weak).Key Recommendations
Initiate intravenous antibiotic therapy targeting the causative organism promptly for acute pyelonephritis (Evidence: Strong 12).
Consider percutaneous nephropyelostomy in cases of severe acute pyohydronephrosis as a definitive management strategy (Evidence: Weak 3).
Evaluate pediatric patients for potential adjunctive dexamethasone therapy to mitigate kidney scarring risk, acknowledging moderate evidence support (Evidence: Moderate 1).References
1 Rius-Gordillo N, Ferré N, González JD, Ibars Z, Parada-Ricart E, Fraga MG et al.. Dexamethasone to prevent kidney scarring in acute pyelonephritis: a randomized clinical trial. Pediatric nephrology (Berlin, Germany) 2022. link
2 Jones BF, Nanra RS, White KH. Acute renal failure due to acute pyelonephritis. American journal of nephrology 1991. link
3 Barbaric ZL, Davis RS, Frank IN, Linke CA, Lipchik EO, Cockett AT. Percutaneous nephropyelostomy in the management of acute pyohydronephrosis. Radiology 1976. link
4 Bailey RR, Little PJ, Rolleston GL. Renal damage after acute pyelonephritis. British medical journal 1969. link