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Cystitis
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"cystitis" AND "urinary tract infection"
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Here is a thorough overview of cystitis based on Harrison's Principles of Internal Medicine 22E (2025) and Goldman-Cecil Medicine:
Cystitis
Definition
Cystitis is inflammation of the bladder, most commonly caused by bacterial infection (urinary tract infection, UTI). It is classified as:
- Uncomplicated - occurs in otherwise healthy, non-pregnant, non-catheterized women
- Complicated - occurs in men, pregnant women, catheterized patients, or those with structural/functional urinary tract abnormalities
Symptoms
| Symptom | Notes |
|---|---|
| Dysuria | Burning or pain on urination |
| Urinary frequency | Urge to urinate more often |
| Urinary urgency | Sudden, strong need to urinate |
| Suprapubic discomfort/tenderness | Pain over the bladder |
| Nocturia | New or worsened night-time urination |
| Gross hematuria | Blood in urine |
Red flags: Fever, rigors, and flank/back pain are NOT consistent with uncomplicated cystitis - they suggest pyelonephritis, prostatitis, or bloodstream infection and require further workup.
Diagnosis
- Women with classic symptoms: Can be treated empirically on history alone
- Urine dipstick: Useful but a negative result does not fully rule out UTI in symptomatic women
- Urine culture: Required in pregnant patients, suspected resistant organisms, or recurrent UTI
- Men: Urine culture always needed to differentiate bacterial cystitis from chronic pelvic pain syndrome (no bacteriuria, not treated with antibiotics)
Common Pathogens
- Escherichia coli (most common, ~80% of community-acquired cases)
- Staphylococcus saprophyticus (young women)
- Klebsiella, Proteus, Enterococcus (less common)
Treatment
First-Line Antibiotics (Acute Uncomplicated Cystitis)
| Drug | Dose | Duration (Women) | Duration (Men) |
|---|---|---|---|
| Nitrofurantoin | 100 mg twice daily | 5-7 days | 5-7 days |
| TMP-SMX | 1 DS tablet twice daily | 3 days | 7 days |
| Fosfomycin | 3 g sachet | 1 day (single dose) | Every other day x 3 doses |
| Pivmecillinam | 400 mg twice daily | 3-7 days | - |
- Nitrofurantoin has the fewest adverse effects and best clinical/microbiologic resolution at 28 days
- Fosfomycin is particularly useful when multidrug-resistant (MDR) E. coli is suspected
- Pivmecillinam was FDA-approved for cystitis in the United States in 2024
Second-Line Agents
- Fluoroquinolones (3 days in women, 7 days in men) - NOT recommended first-line due to toxicity concerns and resistance promotion
- Beta-lactams (5-7 days) - about 10% less effective than first-line agents; preferred in pregnancy (nitrofurantoin or oral cephalosporins)
Symptomatic Relief
- Phenazopyridine (100 mg, 1-2 tablets up to 3x/day for up to 2 days) for acute pain relief - must be used with antibiotics, NOT alone; can stain soft contact lenses
Special Populations
- Pregnant women: Urine culture always needed; treat with nitrofurantoin or oral cephalosporins (safe for fetus)
- Men: Cystitis is uncommon - must first exclude prostatitis and pyelonephritis; treat for 7 days minimum
- Recurrent UTI: Consider early self-treatment strategy; base antibiotic choice on culture/sensitivity
Cystitis vs. Pyelonephritis
| Feature | Cystitis | Pyelonephritis |
|---|---|---|
| Fever | Absent | Present |
| Flank/back pain | Absent | Present |
| Systemic symptoms | Absent | Nausea, vomiting, rigors |
| Confined to | Bladder | Kidney(s) |
Sources: Harrison's Principles of Internal Medicine 22E (2025), Goldman-Cecil Medicine International Edition
The recent literature (2025-2026) is exploring phage therapy as a future option for antibiotic-resistant UTIs (PMID 40435529), though this remains investigational and is not yet standard of care.
What is watershed in anterior abdomen
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Watershed of the Anterior Abdominal Wall
The watershed of the anterior abdominal wall is a curved boundary zone located just above the umbilicus and below the costal arch. It is the dividing line between two distinct lymphatic (and venous) drainage territories of the anterior trunk wall.
What It Means
The watershed marks where lymphatic flow switches direction - above this line, lymph drains upward toward the axillary nodes; below it, lymph drains downward toward the superficial inguinal nodes.
The Two Drainage Zones
| Zone | Drains To | Final Collection |
|---|---|---|
| Supraumbilical (above watershed) | Axillary lymph nodes | Right lymphatic duct (right upper quadrant) or Thoracic duct (other quadrants) |
| Infraumbilical (below watershed) | Superficial inguinal lymph nodes | Thoracic duct |
This follows the same general pattern as venous drainage of the anterior trunk wall.
The Diagram (THIEME Atlas of Anatomy)
The image above clearly labels the "Watershed" line on the anterior trunk wall, showing:
- The upper zone (green) - draining to axillary nodes
- The lower zone (purple/blue) - draining to superficial inguinal nodes
- Arrows showing the direction of lymph flow
Special Note at the Umbilical Region
At the umbilicus itself, there are direct connections between the lymphatics of the anterior abdominal wall and the intra-abdominal lymphatics. This means metastatic cancer can spread from intra-abdominal organs to the umbilical skin - a phenomenon known as Sister Mary Joseph's nodule (umbilical metastasis).
There is also considerable variation in drainage at the actual umbilical level, which is why sentinel node mapping is important when assessing tumors in this region.
Clinical Significance
- A tumor above the watershed (e.g., upper abdominal wall skin cancer) will spread to axillary nodes
- A tumor below the watershed will spread to inguinal nodes
- Tumors at or near the watershed can spread to either or both node groups - making surgical planning complex
- The watershed concept also applies to colonic blood supply: the splenic flexure and sigmoid colon are vascular watershed zones prone to ischemia
Sources: THIEME Atlas of General Anatomy and Musculoskeletal System; Fischer's Mastery of Surgery, 8th Edition
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