Urinary Tract Infections: Cystitis and Pyelonephritis Overview

Cystitis:
- Inflammation of the bladder.
- Characterized by:
- Dysuria (painful urination)
- Urinary frequency or urgency
- Hematuria (blood in urine)
- Suprapubic pain
- Considered a lower urinary tract infection (UTI).
Pyelonephritis:
- Inflammation of the kidneys.
- Characterized by:
- Similar symptoms to cystitis
- Systemic symptoms such as fever and chills
- Costovertebral angle tenderness (CVA tenderness)
- Mental status changes, malaise, shaking, rigors, tachypnea, tachycardia
- Considered an upper urinary tract infection.

UTIs are more common in females (30-40% experience an episode yearly).
- Urethra's shorter length facilitates bacteria colonization.
Peaks in:
- Age 20-40: Sexual intercourse
- Age 55-60: Decline in estrogen levels
Elderly present atypically with:
- Acute confusion, functional decline, falls

Importance of ruling out other causes of confusion in elderly patients.
Urinalysis (UA)
- Obtain culture if indicated, especially if symptoms are present.
- Urgency in prescribing empiric antibiotics if the patient is declining.
- Avoid UA if there is only an odor or color change without symptoms.
- Routine catheter placement doesn’t warrant UA.
Urine culture interpretation:
- >100,000 CFU/mL in females;
  in men, ≥10,000 CFU/mL is significant.

Key Indicators:
- Specific Gravity: Elevated indicates dehydration.
- Nitrates: Presence indicates nitrate-reducing microorganism (e.g., E. Coli).
- Leukocyte Esterase: Indicates presence of white blood cells (WBCs).
Consider microscopy results:
- >10 white cells per hyperfield suggests infection.
- Epithelial cells >100 suggest contamination.

Common pathogens:
- Gram-Negative: E. Coli, Klebsiella, Proteus
- Others: Staph aureus (test blood cultures if present in urine)
Cautions: Group B Strep, Enterococcus faecalis are often contaminants.

First-line agents:
- Nitrofurantoin (Macrobid) - 5 days
- Trimethoprim-sulfamethoxazole (Bactrim) - 3 days
- Fosfomycin - one-time dose
Alternatives:
- Beta-lactams (e.g., Cephalexin, Cefdinir)
- Fluoroquinolones as second-line (e.g., Cipro, Levaquin) with caution regarding side effects.

Treatment:
- IV antibiotics: Ceftriaxone
- Alternatives: Zosyn, aminoglycosides, and more targeted therapy based on culture.

Consider risk factors for multidrug-resistant organisms
Treatment includes:
- IV antibiotics (Ceftriaxone, Zosyn for resistant cases)
- Transition to oral therapy after improvement and culture results
- Duration of treatment: generally 10-14 days for pyelonephritis

Midstream clean catch results should be analyzed with symptoms in mind.
Pyuria, nitrates, leukocyte esterase indicates UTI but not diagnostic on their own.
Simple UTIs can be treated with short courses of Bactrim or nitrofurantoin; consider patient tolerances and allergies.
Pregnant women should be treated cautiously with appropriate antibiotics, avoiding harmful substances.

For complex cases (e.g., elderly male with recurrent symptoms), consider IV fluids, broad-spectrum IV antibiotics until cultures identify specific pathogens.
For stable young females, simpler treatment options (e.g., Bactrim) may suffice for uncomplicated UTIs.

Understanding the differences between cystitis and pyelonephritis is crucial for treatment decisions.
Consider age, gender, and comorbidities when diagnosing UTIs.
Accurate lab results, patient history, and clinical presentation are essential in guiding treatment.
There are specific considerations and treatments for uncomplicated versus complicated UTIs.