Which of the following is recommended in diagnosing an uncomplicated urinary tract infection (UTI)?
Urinalysis to identify the red blood cells (RBCs)
Urine culture to identify specific bacteria causing the UTI
Urine dipstick to identify leukocyte esterase or nitrite reductase
Renal ultrasound
The Correct Answer is C
A. Identifying red blood cells in the urine, or hematuria, can occur with a UTI but is non-specific and can be caused by stones, trauma, or malignancy. While it provides additional clinical context, the presence of RBCs alone is not a primary diagnostic criterion for an uncomplicated infection. The focus of the diagnosis remains on markers of bacterial presence and the host's inflammatory response.
B. A urine culture is the gold standard for identifying bacteria, but it is generally not recommended for the initial diagnosis of an uncomplicated UTI in healthy women. Cultures take 24 to 48 hours to yield results, whereas treatment is usually initiated based on rapid screening and clinical symptoms. Cultures are reserved for complicated cases, pregnancy, or when initial treatment has failed.
C. A urine dipstick is the primary recommended tool for diagnosing uncomplicated UTIs because it provides immediate results for leukocyte esterase and nitrites. Leukocyte esterase indicates the presence of white blood cells (pyuria), while nitrites indicate the presence of gram-negative bacteria like E. coli that reduce nitrates. This rapid test allows for the prompt initiation of targeted antibiotic therapy
D. A renal ultrasound is an imaging study used to visualize the structure of the kidneys and is not indicated for the diagnosis of an uncomplicated UTI. It is used primarily to rule out complications like hydronephrosis, abscesses, or structural abnormalities in patients with recurrent or severe infections. For a standard, simple bladder infection, imaging provides no useful diagnostic information and increases healthcare costs.
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Related Questions
Correct Answer is B
Explanation
A. Left ventricular hypertrophy is a common cardiovascular complication of uremia due to chronic fluid overload and systemic hypertension. The heart must pump against increased afterload and manage higher stroke volumes, leading to pathological remodeling of the cardiac muscle. This structural change significantly increases the risk of heart failure and arrhythmias in renal patients.
B. All choices are correct because uremia affects virtually every organ system through the accumulation of nitrogenous wastes and electrolyte imbalances. The multisystemic nature of chronic kidney disease encompasses cardiac remodeling, skeletal instability, and respiratory complications. Understanding these diverse manifestations is crucial for the comprehensive management of patients with advanced renal failure and uremic syndrome.
C. Spontaneous fractures and bone pain result from renal osteodystrophy, a complex disorder of mineral and bone metabolism. As kidneys fail, they cannot activate vitamin D or excrete phosphate, leading to secondary hyperparathyroidism and calcium resorption from the skeleton. This leaves the bones structurally weakened, brittle, and highly susceptible to injury even with minimal physical stress.
D. Pulmonary edema occurs in uremic patients primarily due to sodium and water retention and increased alveolar-capillary permeability. When the kidneys lose their ability to maintain fluid homeostasis, excess intravascular volume backs up into the pulmonary circulation. This leads to the extravasation of fluid into the lung parenchyma, severely impairing gas exchange and causing acute respiratory distress.
Correct Answer is D
Explanation
A. The formation of prostatic cysts is an anatomical abnormality that can occur within the gland, but it is not the defining mechanism of BPH. BPH is specifically characterized by cellular hyperplasia rather than the development of fluid-filled sacs. Cysts may cause similar obstructive symptoms, but they represent a different pathological entity than benign glandular enlargement.
B. Increased production of androgens is not the cause of BPH; rather, the condition is driven by the intraprostatic conversion of testosterone to dihydrotestosterone (DHT) via 5-alpha reductase. While androgens are necessary for the development of BPH, systemic levels do not necessarily increase. The pathology stems from the sensitivity of prostatic tissue to DHT over time.
C. Inflammation and infection of the prostate gland are defined as prostatitis, which can cause acute or chronic pelvic pain and urinary symptoms. While BPH and prostatitis can coexist, the primary mechanism of BPH is non-inflammatory cellular growth. Chronic infection may exacerbate urinary symptoms, but it does not drive the benign proliferative changes of the transition zone.
D. Progressive enlargement of the prostate gland is the fundamental pathophysiological mechanism of BPH, resulting from the hyperplasia of epithelial and stromal cells. This growth primarily occurs in the transition zone, which surrounds the proximal urethra. As the gland expands, it causes mechanical compression of the urethral lumen, leading to the clinical manifestations of lower urinary tract obstruction.
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