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Pyelonephritis — Clinical Guidelines

Overview

Acute pyelonephritis is a severe urinary tract infection that ascends to the kidney, potentially leading to sepsis, renal abscesses, and complications such as pyonephrosis and emphysematous pyelonephritis 1 2 5.

Diagnosis

Clinical Presentation: Fever, flank pain, dysuria, and systemic signs of infection 1 2.

Laboratory Tests: Elevated white blood cell count, positive urine cultures (common organisms include E. coli, Proteus, and Klebsiella) 1 11.

Imaging: Ultrasound showing enlarged kidney with increased anechoic corticomedullary area; CT may reveal abscesses or gas formation in emphysematous pyelonephritis 21 7.

Differentiation: Ultrasound helps differentiate from obstructive uropathy 21.

Management

Antibiotics: Initial empirical therapy targeting common pathogens (e.g., fluoroquinolones, cephalosporins) 2 4.

Supportive Care: Fluid resuscitation, monitoring for sepsis, and management of complications 2.

Surgical Intervention: Considered for abscess drainage, pyonephrosis, or refractory cases 7 14 17.

Specific Cases:

- Emphysematous Pyelonephritis: Aggressive management including percutaneous drainage or surgery 7 14 15. - Fungal Infections: Tailored antifungal therapy (e.g., nephrectomy for Candida albicans) 9.

Special Populations

Pregnancy: Introduction of clinical pathways improves outcomes; antimicrobial stewardship is crucial 3 4.

Comorbidities: Diabetic patients are at higher risk for severe forms like emphysematous pyelonephritis 7 9.

Pediatrics: Focal xanthogranulomatous pyelonephritis can be misdiagnosed; careful imaging and biopsy may be needed 10.

Key Recommendations

Early Diagnosis and Prompt Antibiotic Therapy: Initiate broad-spectrum antibiotics promptly based on clinical suspicion and urine cultures (Evidence: Strong 2 4).

Imaging for Complicated Cases: Utilize ultrasound and CT for identifying abscesses or complications like pyonephrosis and emphysematosis (Evidence: Moderate 21 7).

Surgical Consultation for Severe Complications: Consider surgical intervention for abscess drainage, pyonephrosis, or refractory cases (Evidence: Moderate 7 14).

Tailored Management for Specific Pathogens: Adjust antimicrobial therapy based on culture and sensitivity results, especially for fungal infections (Evidence: Moderate 9).

Enhanced Care Pathways in Obstetrics: Implement structured clinical pathways to improve outcomes in obstetric patients with pyelonephritis (Evidence: Moderate 3).

References

1 Kumar LP, Khan I, Kishore A, Gopal M, Behera V. Pyonephrosis among Patients with Pyelonephritis Admitted in Department of Nephrology and Urology of a Tertiary Care Centre: A Descriptive Cross-sectional Study. JNMA; journal of the Nepal Medical Association 2023. link 2 Smith AD, Nikolaidis P, Khatri G, Chong ST, De Leon AD, Ganeshan D et al.. ACR Appropriateness Criteria® Acute Pyelonephritis: 2022 Update. Journal of the American College of Radiology : JACR 2022. link 3 Clooney L, Ronayne A, Glennon K, Brennan M, Hickey N, Magee C et al.. Impact of Introduction of a Clinical Pathway for the Management of Pyelonephritis on Obstetric Patients: a Quality Improvement Project. Irish medical journal 2019. link 4 Antonello VS, Cunegatto MC, Rosin ET, Castilhos JX, Beduschi FG, Bumaguin DB et al.. The Use of Mobile Educational Tools to Improve Antimicrobial Prescription for the Treatment of Acute Pyelonephritis in Pregnancy: A Retrospective Cross-sectional Study. Revista brasileira de ginecologia e obstetricia : revista da Federacao Brasileira das Sociedades de Ginecologia e Obstetricia 2019. link 5 Chivima B. Pyelonephritis. Nursing standard (Royal College of Nursing (Great Britain) : 1987) 2014. link 6 . Acute pyelonephritis in brief. Prescrire international 2014. link 7 Dhabalia JV, Nelivigi GG, Kumar V, Gokhale A, Punia MS, Pujari N. Emphysematous pyelonephritis: tertiary care center experience in management and review of the literature. Urologia internationalis 2010. link 8 Punekar SV, Kinne JS, Rao SR, Madiwale C, Karhadkar SS. Xanthogranulomatous pyelonephritis presenting as emphysematous pyelonephritis: a rare association. Journal of postgraduate medicine 1999. link 9 Hildebrand TS, Nibbe L, Frei U, Schindler R. Bilateral emphysematous pyelonephritis caused by Candida infection. American journal of kidney diseases : the official journal of the National Kidney Foundation 1999. link70331-8) 10 Hoeffel JC, Chastagner P, Boman F, Galloy MA, Mainard L. Misleading leads: focal xanthogranulomatous pyelonephritis in childhood. Medical and pediatric oncology 1998. link1096-911x(199802)30:2<122::aid-mpo10>3.0.co;2-q) 11 Koga S, Arakaki Y, Matsuoka M, Ohyama C. Calculous pyelonephritis. International urology and nephrology 1992. link 12 Kwong T, Chiu G, Smith RB. Emphysematous pyelonephritis: case report. The New Zealand medical journal 1990. link 13 Joris L, van Daele G, Timmermans U, Rutsaert RJ. Emphysematous pyelonephritis. Intensive care medicine 1989. link 14 Hudson MA, Weyman PJ, van der Vliet AH, Catalona WJ. Emphysematous pyelonephritis: successful management by percutaneous drainage. The Journal of urology 1986. link45115-9) 15 Johnson JR, Ireton RC, Lipsky BA. Emphysematous pyelonephritis caused by Candida albicans. The Journal of urology 1986. link44736-7) 16 Digamon-Beltran M, Feigman T, Klein SA, Gobbo PN, Cunha BA. Lactobacillemia in pregnancy. Southern medical journal 1985. link 17 Szokoly V, Pintér J. Pyeloplastic surgery in the presence of suppurative pyelonephritis. International urology and nephrology 1985. link 18 Ohba S, Tsuchiya H, Kohno S, Hamazaki M. Ureteritis and pyelitis emphysematosa in a neonate. Pediatric radiology 1984. link 19 Sherwood JA, Dansky AS. Paecilomyces pyelonephritis complicating nephrolithiasis and review of Paecilomyces infections. The Journal of urology 1983. link51287-2) 20 Irwin DH, Howell DW. Equine pyelonephritis and unilateral nephrectomy. Journal of the South African Veterinary Association 1980. link 21 Edell SL, Bonavita JA. The sonographic appearance of acute pyelonephritis. Radiology 1979. link 22 Adler SN. Nonobstructive pyelonephritis initially seen as acute renal failure. Archives of internal medicine 1978. link 23 Carris CK, Schmidt JD. Emphysematous pyelonephritis. The Journal of urology 1977. link58059-3) 24 Morgan OS, Nicholson GD, Johnson PS, Atkinson DW. Xanthogranulomatous pyelonephritis: a report of 2 cases. The British journal of surgery 1975. link

Pyelonephritis