Acute Cystitis (Urinary Tract Infection)

A 28-year-old female patient presents to the emergency department with complaints of urinary symptoms. Which assessment finding would be most characteristic of acute cystitis?

1 Flank pain and costovertebral angle tenderness
2 Dysuria and urinary frequency with suprapubic discomfort ✓ 정답
3 Oliguria with proteinuria and hematuria
4 High fever with chills and nausea

해설

Dysuria and urinary frequency with suprapubic discomfort are the classic triad most characteristic of acute cystitis, distinguishing it from upper UTI symptoms like flank pain or high fever.

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Understanding the Clinical Presentation of Acute Cystitis

To differentiate acute cystitis from other urinary and renal pathologies, it is essential to anchor the assessment in the anatomical location of the infection. Acute cystitis is an infection of the urinary bladder and represents the most common urinary tract infection (UTI) in women ^[1]. The pathophysiology is driven by bacterial invasion of the bladder mucosa, most often by uropathogens ascending via the urethra. Women are disproportionately affected due to the anatomical proximity of the urethral meatus to the rectum and a shorter urethral length, which facilitates easier bacterial entry ^[1].

The clinical manifestation of acute cystitis is a direct result of localized bladder mucosal inflammation and irritation. The typical clinical features include urinary frequency, urgency, dysuria, and suprapubic discomfort ^[1]. These symptoms are hallmarks of a lower urinary tract infection. The inflammatory response causes the detrusor muscle to become hyperirritable, leading to frequent, often urgent, and painful voiding of small volumes. Suprapubic pain or tenderness reflects the bladder's anatomical location in the pelvis.

In contrast, the other options describe findings associated with upper urinary tract involvement or systemic illness. Flank pain and costovertebral angle (CVA) tenderness are classic indicators of pyelonephritis, an infection that has ascended from the bladder to the renal parenchyma. High fever with chills and nausea signifies a systemic inflammatory response, which, by definition, is absent in acute uncomplicated cystitis. The condition is defined as a UTI confined to the lower urinary tract without systemic manifestations ^[1]. Finally, oliguria with proteinuria is more suggestive of intrinsic kidney injury, such as acute glomerulonephritis, rather than an isolated bladder infection. While macroscopic hematuria can occur in acute hemorrhagic cystitis, it is the constellation of dysuria, frequency, and suprapubic pain that forms the most characteristic and specific clinical picture for a localized bladder infection ^[4].

References (research sources)

[1]
Acute CystitisResearch articleGill R, Leslie SW, Minter DA. (2026)
[4]
Women with isolated acute cystitis and macroscopic haematuria. Is further investigation needed?Research articleHassan R, Ljungstedt R, Ågren E, Olsson S, Sabir E, Abuhasanein S. (2025) · DOI: 10.2340/sju.v60.44702

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A 28-year-old female patient presents to the emergency department with complaints of urinary symptoms. Which assessment finding would be most characteristic of acute cystitis?

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