Urinary complications US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Urinary complications. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Urinary complications US Medical PG Question 1: A 37-year-old woman presents with an inability to void in the hours after giving birth to her first child via vaginal delivery. Her delivery involved the use of epidural anesthesia as well as pelvic trauma from the use of forceps. She is currently experiencing urinary leakage and complains of increased lower abdominal pressure. Which of the following is the most appropriate treatment for this patient’s condition?
- A. Pessary insertion
- B. Pelvic floor muscle strengthening
- C. Antimuscarinic drugs
- D. Midurethral sling
- E. Urethral catheterization (Correct Answer)
Urinary complications Explanation: ***Urethral catheterization***
- The patient is experiencing **postpartum urinary retention** (inability to void) and **overflow incontinence** (urinary leakage due to bladder overdistension), alongside increased lower abdominal pressure, all indicative of an overfilled bladder.
- **Urethral catheterization** is the most appropriate immediate treatment to relieve bladder distension, prevent kidney damage, and allow bladder recovery.
*Pessary insertion*
- **Pessaries** are used for pelvic organ prolapse or stress urinary incontinence, not for acute postpartum urinary retention.
- They provide structural support but do not address the inability to void in an overdistended bladder.
*Pelvic floor muscle strengthening*
- **Pelvic floor exercises** are beneficial for stress incontinence or mild degrees of prolapse.
- They are contraindicated in acute urinary retention as they may worsen the inability to void if the issue is a failure of bladder contractility or urethral relaxation.
*Antimuscarinic drugs*
- **Antimuscarinics** relax the detrusor muscle and are used to treat overactive bladder symptoms (e.g., urgency, frequency).
- They would worsen bladder emptying in a patient with urinary retention.
*Midurethral sling*
- A **midurethral sling** is a surgical procedure for stress urinary incontinence.
- It is an invasive treatment for a chronic condition and is not appropriate for acute postpartum urinary retention.
Urinary complications US Medical PG Question 2: A 26-year-old female presents to her primary care physician concerned that she has contracted a sexually transmitted disease. She states that she is having severe pain whenever she urinates and seems to be urinating more frequently than normal. She reports that her symptoms started after she began having unprotected sexual intercourse with 1 partner earlier this week. The physician obtains a urinalysis which demonstrates the following, SG: 1.010, Leukocyte esterase: Positive, Nitrites: Positive, Protein: Trace, pH: 5.0, RBC: Negative. A urease test is performed which is negative. This patient has most likely been infected with which of the following organisms?
- A. Enterobacter cloacae
- B. Staphylococcus saprophyticus
- C. Proteus mirabilis
- D. Klebsiella pneumoniae
- E. Escherichia coli (Correct Answer)
Urinary complications Explanation: ***Escherichia coli***
- The urinalysis findings of **positive leukocyte esterase**, **nitrites**, and **trace protein** with a slightly acidic pH (5.0) are highly suggestive of a **urinary tract infection (UTI)**.
- *E. coli* is the most common cause of UTIs, especially in young, sexually active women, and is typically **urease-negative**, consistent with the information provided.
- *E. coli* accounts for **80-90% of uncomplicated UTIs** and produces nitrites from dietary nitrates, making it the most likely pathogen in this clinical scenario.
*Enterobacter cloacae*
- While *Enterobacter cloacae* can cause UTIs, it is less common than *E. coli* in uncomplicated cases and is often associated with nosocomial infections or those in immunocompromised individuals.
- Its urease activity can vary, so a negative urease test doesn't rule it out completely but makes *E. coli* a more likely primary choice in this context.
*Staphylococcus saprophyticus*
- *S. saprophyticus* is a common cause of UTIs in young, sexually active women (second most common cause after *E. coli*) and is typically **urease-negative**, which is consistent with the negative test.
- However, the presence of **positive nitrites** points more strongly towards **Gram-negative bacteria** like *E. coli*, as *S. saprophyticus* is a **Gram-positive coccus** that does not produce nitrite reductase and therefore does not convert nitrates to nitrites.
*Proteus mirabilis*
- *Proteus mirabilis* is known for causing UTIs and is characteristically **urease-positive**, leading to alkaline urine (higher pH) and sometimes **struvite stones**.
- The **negative urease test** and acidic urine pH (5.0) in this case effectively rule out *Proteus mirabilis*.
*Klebsiella pneumoniae*
- *Klebsiella pneumoniae* can cause UTIs and is generally **urease-negative**, but it is less frequently the cause of uncomplicated UTIs compared to *E. coli*.
- Although it can produce nitrites, *E. coli* remains the most common etiology in this clinical scenario.
Urinary complications US Medical PG Question 3: Nine days after being treated for a perforated gastric ulcer and sepsis, a 78-year-old woman develops decreased urinary output and malaise. She required emergency laparotomy and was subsequently treated in the intensive care unit for sepsis. Blood cultures grew Pseudomonas aeruginosa. The patient was treated with ceftazidime and gentamicin. She has type 2 diabetes mellitus, arterial hypertension, and osteoarthritis of the hips. Prior to admission, her medications were insulin, ramipril, and ibuprofen. Her temperature is 37.3°C (99.1°F), pulse is 80/min, and blood pressure is 115/75 mm Hg. Examination shows a healing surgical incision in the upper abdomen. Laboratory studies show:
Hemoglobin count 14 g/dL
Leukocyte count 16,400 mm3
Segmented neutrophils 60%
Eosinophils 2%
Lymphocytes 30%
Monocytes 6%
Platelet count 260,000 mm3
Serum
Na+ 137 mEq/L
Cl- 102 mEq/L
K+ 5.1 mEq/L
Urea nitrogen 25 mg/dL
Creatinine 4.2 mg/dL
Fractional excretion of sodium is 2.1%. Which of the following findings on urinalysis is most likely associated with this patient's condition?
- A. RBC casts
- B. WBC casts
- C. Waxy casts
- D. Muddy brown casts (Correct Answer)
- E. Pigmented casts
Urinary complications Explanation: ***Muddy brown casts***
- The patient's presentation with **decreased urinary output**, **malaise**, and significantly **elevated creatinine** (4.2 mg/dL) after recent sepsis and treatment with nephrotoxic drugs (gentamicin) strongly suggests **acute tubular necrosis (ATN)**.
- **Muddy brown casts** are pathognomonic for **acute tubular necrosis**, indicating damage to the renal tubules.
*RBC casts*
- **Red blood cell (RBC) casts** are indicative of **glomerulonephritis** or severe glomerular damage, which is not suggested by the clinical picture.
- While the patient has hypertension and diabetes, her current acute kidney injury (AKI) is more consistent with ATN given the recent sepsis and aminoglycoside use.
*WBC casts*
- **White blood cell (WBC) casts** are characteristic of **pyelonephritis** (kidney infection) or **interstitial nephritis**.
- Although she had sepsis, there is no direct evidence of pyelonephritis, and interstitial nephritis would present differently.
*Waxy casts*
- **Waxy casts** are associated with **chronic kidney disease** and indicate severe, longstanding tubular atrophy and urine stasis.
- While she has risk factors for chronic kidney disease (diabetes, hypertension), her acute decline points to an acute process like ATN, making waxy casts less likely as the primary finding.
*Pigmented casts*
- **Pigmented casts** (e.g., myoglobin casts in rhabdomyolysis or hemoglobin casts in hemolysis) are seen in conditions involving the release of large amounts of pigments into the bloodstream.
- While sepsis can cause hemolysis or muscle breakdown, **muddy brown casts** specifically refer to the granular, pigmented casts seen in ATN due to damaged tubular cells and heme pigments. "Pigmented casts" is a broader term, and "muddy brown casts" is more specific to ATN.
Urinary complications US Medical PG Question 4: A 40-year-old woman was admitted to the surgical service after an uncomplicated appendectomy. She underwent surgery yesterday and had an uneventful postoperative course. However, she now complains that she is unable to completely void. She also complains of pain in the suprapubic area. You examine her and confirm the tenderness and fullness in the suprapubic region. You ask the nurse to perform a bladder scan, which reveals 450cc. What is the next appropriate step in management?
- A. Catheterization (Correct Answer)
- B. Oral bethanechol chloride
- C. Neostigmine methylsulfate injection
- D. Intravenous furosemide
- E. Intravenous neostigmine methylsulfate
Urinary complications Explanation: **Catheterization**
- The patient is presenting with **acute urinary retention**, confirmed by the inability to void, suprapubic pain, and a bladder scan showing 450cc, which exceeds the typical threshold for intervention (often 200-300cc).
- **Immediate catheterization** (usually Foley catheterization) is necessary to drain the bladder, relieve discomfort, and prevent complications like bladder distension injury or hydronephrosis.
*Oral bethanechol chloride*
- Bethanechol is a **cholinergic agonist** used to stimulate bladder contraction in cases of hypotonic bladder, but it is not appropriate for acute, complete urinary retention requiring immediate drainage.
- Its onset of action is too slow for the urgency of acute retention, and it would not resolve the immediate discomfort or risk of bladder damage.
*Neostigmine methylsulfate injection*
- Neostigmine is an **acetylcholinesterase inhibitor** that increases acetylcholine levels, potentially improving bladder contractility, but it is not typically the first-line treatment for acute postoperative urinary retention.
- Like bethanechol, it doesn't provide the rapid relief of bladder distension that catheterization does and is more often considered for chronic or neurogenic bladder dysfunction once acute retention is managed.
*Intravenous furosemide*
- Furosemide is a **loop diuretic** that increases urine production, which would exacerbate the problem in a patient with acute urinary retention.
- Increasing urine output without the ability to void would worsen bladder distension and patient discomfort, making it a contraindicated intervention.
*Intravenous neostigmine methylsulfate*
- While neostigmine can be given intravenously, its use in acute postoperative urinary retention is **not a primary treatment**.
- Its effect is slower than direct bladder drainage, and the immediate priority is to decompress the bladder to relieve symptoms and prevent complications.
Urinary complications US Medical PG Question 5: A 58-year-old man presents to the Emergency Department after 3 hours of intense suprapubic pain associated with inability to urinate for the past day or two. His medical history is relevant for benign prostatic hyperplasia (BPH) that has been under treatment with prazosin and tadalafil. Upon admission, he is found to have a blood pressure of 180/100 mm Hg, a pulse of 80/min, a respiratory rate of 23/min, and a temperature of 36.5°C (97.7°F). He weighs 84 kg (185.1 lb) and is 175 cm (5 ft 7 in) tall. Physical exam, he has suprapubic tenderness. A bladder scan reveals 700 ml of urine. A Foley catheter is inserted and the urine is drained. Initial laboratory tests and their follow up 8 hours after admission are shown below.
Admission 8 hours after admission
Serum potassium 4.2 mmol/L Serum potassium 4.0 mmol/L
Serum sodium 140 mmol/L Serum sodium 142 mmol/L
Serum chloride 102 mmol/L Serum chloride 110 mmol/L
Serum creatinine 1.4 mg/dL Serum creatinine 1.6 mg/dL
Serum blood urea nitrogen 64 mg/dL Serum blood urea nitrogen 62 mg/dL
Urine output 250 mL Urine output 260 mL
A senior attending suggests a consultation with Nephrology. Which of the following best justifies this suggestion?
- A. Estimated glomerular filtration rate (eGFR)
- B. Urine output (Correct Answer)
- C. Serum creatinine (SCr)
- D. Serum blood urea nitrogen (BUN)
- E. Serum potassium
Urinary complications Explanation: ***Urine output***
- The patient's **urine output is severely reduced** at 260 mL over 8 hours (approximately **32.5 mL/hour**), which constitutes **oliguria** (defined as <0.5 mL/kg/hr; this patient at 84 kg should produce ≥42 mL/hr).
- Despite **relief of the post-renal obstruction** via Foley catheterization, the persistent oliguria indicates **intrinsic kidney injury** rather than simple mechanical obstruction.
- The combination of **oliguria persisting after decompression** + **rising serum creatinine** (1.4→1.6 mg/dL) meets **KDIGO criteria for Stage 2 AKI** (urine output <0.5 mL/kg/hr for ≥12 hours).
- This requires **urgent nephrology consultation** to assess for acute tubular necrosis (ATN), guide fluid management during potential post-obstructive diuresis, and consider renal replacement therapy if oliguria worsens.
*Serum creatinine (SCr)*
- The serum creatinine **rose from 1.4 to 1.6 mg/dL** despite bladder decompression, which is concerning and suggests intrinsic renal injury.
- However, creatinine is a **lagging indicator** of kidney function - it takes 24-48 hours to reflect acute changes in GFR, whereas **urine output is a real-time indicator** of kidney function.
- While the rising creatinine supports the need for nephrology involvement, **urine output is the more immediate and actionable parameter** that prompted the attending's suggestion at this early time point.
*Estimated glomerular filtration rate (eGFR)*
- eGFR is **calculated from serum creatinine** using equations that assume steady-state conditions, which **do not apply in acute kidney injury**.
- In the **acute setting with rapidly changing kidney function**, eGFR calculations are unreliable and can significantly overestimate or underestimate true GFR.
- Clinicians rely more on **urine output and serial creatinine measurements** rather than eGFR when managing AKI.
*Serum blood urea nitrogen (BUN)*
- The BUN decreased slightly from 64 to 62 mg/dL, remaining elevated but showing minimal change after catheterization.
- Elevated BUN can reflect **pre-renal azotemia, dehydration, or upper GI bleeding** and is less specific for intrinsic kidney injury than oliguria.
- The **BUN:Cr ratio** is approximately 40:1 (64/1.6), suggesting a **pre-renal component**, but this alone doesn't justify urgent nephrology consultation as strongly as the persistent oliguria does.
*Serum potassium*
- Serum potassium levels remain **normal** (4.2→4.0 mmol/L) and do not indicate a metabolic emergency.
- While **hyperkalemia** is a common complication of AKI that would warrant nephrology involvement, this patient's potassium is well-controlled and not the driving concern at this time.
Urinary complications US Medical PG Question 6: A 40-year-old sailor is brought to a military treatment facility 20 minutes after being involved in a navy ship collision. He appears ill. He reports a sensation that he needs to urinate but is unable to void. His pulse is 140/min, respirations are 28/min, and blood pressure is 104/70 mm Hg. Pelvic examination shows ecchymoses over the scrotum and perineum. There is tenderness over the suprapubic region and blood at the urethral meatus. Digital rectal examination shows a high-riding prostate. Abdominal ultrasound shows a moderately distended bladder. X-rays of the pelvis show fractures of all four pubic rami. Which of the following is the most likely cause of this patient's symptoms?
- A. Tearing of the anterior urethra
- B. Rupture of the corpus cavernosum
- C. Tearing of the posterior urethra (Correct Answer)
- D. Tearing of the ureter
- E. Rupture of the bladder
Urinary complications Explanation: ***Tearing of the posterior urethra***
- The combination of **pelvic fractures**, **blood at the urethral meatus**, inability to void despite a sensation to do so, and a **high-riding prostate** are classic signs of posterior urethral injury.
- The posterior urethra, particularly the membranous portion, is vulnerable to shear forces and tearing during severe pelvic trauma.
*Tearing of the anterior urethra*
- Anterior urethral injuries are typically associated with a **straddle injury** or direct trauma to the perineum, not necessarily pelvic fractures.
- While blood at the meatus can occur, the **high-riding prostate** and extensive pelvic fractures point away from an isolated anterior injury.
*Rupture of the corpus cavernosum*
- This is usually a result of "penile fracture" during sexual intercourse and presents with sudden pain, detumescence, and a characteristic "eggplant" deformity, which are not described here.
- It does not explain the inability to void, high-riding prostate, or association with pelvic fractures.
*Tearing of the ureter*
- Ureteral injuries are typically associated with penetrating trauma or iatrogenic injury during surgery; they rarely occur with blunt pelvic trauma of this nature.
- Symptoms would include flank pain, hematuria, or urine leakage into the retroperitoneum, not significant urethral bleeding or a high-riding prostate.
*Rupture of the bladder*
- Bladder rupture can be intra- or extraperitoneal and is often associated with pelvic fractures. However, it typically causes gross hematuria and often free fluid in the peritoneum (intraperitoneal rupture) or extravasation into the space of Retzius (extraperitoneal rupture).
- While a distended bladder is noted, the presence of **blood at the urethral meatus** and a **high-riding prostate** strongly implicate urethral injury rather than primarily bladder rupture.
Urinary complications US Medical PG Question 7: A previously healthy 26-year-old woman comes to the physician because of a 2-day history of pain with urination. She has been sexually active with two partners over the past year. She uses condoms for contraception. Vital signs are within normal limits. Physical examination shows suprapubic tenderness. Urinalysis shows neutrophils and a positive nitrite test. Urine culture grows gram-negative, oxidase-negative rods that form greenish colonies on eosin-methylene blue agar. Which of the following virulence factors of the causal organism increases the risk of infection in this patient?
- A. Fimbriae (Correct Answer)
- B. Lecithinase
- C. IgA protease
- D. Biofilm production
- E. Lipoteichoic acid
Urinary complications Explanation: ***Fimbriae***
- The patient's symptoms (dysuria, suprapubic tenderness), urinalysis findings (neutrophils, positive nitrite), and culture results (gram-negative, oxidase-negative rods, greenish colonies on EMB agar) are highly suggestive of a **urinary tract infection (UTI)** caused by **Escherichia coli**.
- **P-fimbriae (pili)** are crucial virulence factors for *E. coli* in UTIs, enabling the bacteria to **adhere to uroepithelial cells** and colonize the urinary tract.
*Lecithinase*
- **Lecithinase (alpha-toxin)** is a virulence factor primarily associated with bacteria like *Clostridium perfringens*, causing gas gangrene, and some *Bacillus cereus* strains.
- It is not a significant virulence factor for *E. coli* in the context of UTIs.
*IgA protease*
- **IgA protease** is an enzyme produced by bacteria such as *Neisseria gonorrhoeae*, *Neisseria meningitidis*, and *Haemophilus influenzae*.
- It cleaves IgA antibodies, preventing their protective effects at mucosal surfaces, but it is not a primary virulence factor for *E. coli* in UTIs.
*Biofilm production*
- While *E. coli* can form biofilms, particularly in chronic infections or on catheters, **biofilm production** is not the primary mechanism that increases the **initial risk** of acquiring an acute uncomplicated UTI in a healthy individual.
- The *initial* adherence to uroepithelium, facilitated by fimbriae, is key for colonization and infection establishment.
*Lipoteichoic acid*
- **Lipoteichoic acid** is a major component of the cell wall in **Gram-positive bacteria** and contributes to their immune stimulation and adherence properties.
- The causative organism in this case is a **Gram-negative rod**, making lipoteichoic acid an irrelevant virulence factor.
Urinary complications US Medical PG Question 8: A 63-year-old man undergoes uncomplicated laparoscopic cholecystectomy for acute cholecystitis and is admitted to the surgical ward for postoperative management. On postoperative day 1, routine laboratory studies reveal an increase in serum creatinine to 1.46 mg/dL from 0.98 mg/dL before the operation; BUN is 37 mg/dL, increased from 18 mg/dL on prior measurement; K is 4.8 mEq/L and CO2 is 19 mEq/L. The patient has an indwelling urinary catheter in place, draining minimal urine over the last few hours. Which of the following is the most appropriate next step in management?
- A. Initiate emergent hemodialysis
- B. Obtain bilateral renal ultrasonography
- C. Obtain urinalysis
- D. Evaluate urinary catheter for obstruction (Correct Answer)
- E. Administer IV fluid bolus
Urinary complications Explanation: ***Evaluate urinary catheter for obstruction***
- The patient presents with **acute kidney injury (AKI)** evidenced by elevated BUN and creatinine, along with minimal urine output, raising suspicion for a **post-renal obstruction**.
- Given the presence of an indwelling urinary catheter, a **mechanical obstruction** (e.g., kink, clot) is the most immediate and easily reversible cause to investigate.
*Initiate emergent hemodialysis*
- While the patient has AKI, there are no immediate life-threatening indications for **emergent hemodialysis** such as severe hyperkalemia, refractory acidosis, or pulmonary edema.
- Furthermore, investigating and potentially reversing the cause of AKI should precede considering dialysis.
*Obtain bilateral renal ultrasonography*
- **Renal ultrasonography** is appropriate for evaluating post-renal causes after simpler causes of obstruction, such as a catheter issue, have been ruled out.
- It would be used to assess for hydronephrosis, which indicates **ureteral or bladder outlet obstruction**.
*Obtain urinalysis*
- A **urinalysis** can help characterize intrinsic renal causes of AKI (e.g., ATN, interstitial nephritis) but is less helpful in initial assessment of a suspected acute obstruction related to a catheter.
- The immediate priority is to rule out a mechanical issue with the indwelling catheter.
*Administer IV fluid bolus*
- The patient's BUN/creatinine ratio (approximately 25:1) suggests a potential **pre-renal etiology** (volume depletion), but the minimal urine output with an indwelling catheter warrants ruling out obstruction first.
- Administering fluids without addressing a potential obstruction could worsen patient outcome if the obstruction is present.
Urinary complications US Medical PG Question 9: Three hours after undergoing open proctocolectomy for ulcerative colitis, a 42-year-old male complains of abdominal pain. The pain is localized to the periumbilical and hypogastric regions. A total of 20 mL of urine has drained from his urinary catheter since the end of the procedure. Temperature is 37.2°C (98.9°F), pulse is 92/min, respirations are 12/min, and blood pressure is 110/72 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 99%. Physical examination shows a 20 cm vertical midline incision and an ileostomy in the right lower quadrant. There is no fluid drainage from the surgical wounds. The urinary catheter flushes easily and is without obstruction. Cardiopulmonary examination shows no abnormalities. Serum studies show a blood urea nitrogen of 30 mg/dL and a creatinine of 1.3 mg/dL. Which of the following is the most appropriate next step in management?
- A. Administer tamsulosin
- B. Administer intravenous furosemide
- C. Obtain an abdominal CT
- D. Start ciprofloxacin
- E. Administer intravenous fluids (Correct Answer)
Urinary complications Explanation: ***Administer intravenous fluids***
- The patient's **oliguria** (20 mL urine over 3 hours, ~7 mL/hour) post-surgery, elevated **BUN (30 mg/dL)**, and **creatinine (1.3 mg/dL)** with a **BUN:Cr ratio >20:1** suggest **prerenal acute kidney injury** due to **hypovolemia**.
- Post-operative fluid losses from **third-spacing**, blood loss, and insensible losses commonly cause hypovolemia after major abdominal surgery.
- **Intravenous fluids** are the most appropriate initial step to restore intravascular volume and improve renal perfusion.
*Administer tamsulosin*
- **Tamsulosin** is an alpha-blocker used to relax smooth muscle in the prostate and bladder neck, primarily for **urinary retention** due to benign prostatic hyperplasia.
- This patient's oliguria is due to **prerenal azotemia** from hypovolemia, not prostatic obstruction, and the catheter flushes easily without obstruction.
*Administer intravenous furosemide*
- **Furosemide** is a loop diuretic that increases urine output, but administering it in the context of **prerenal acute kidney injury** can worsen hypovolemia and further compromise renal function.
- Diuretics are generally contraindicated in oliguria due to hypovolemia and should only be considered after volume resuscitation.
*Obtain an abdominal CT*
- While an abdominal CT can diagnose surgical complications, there are no immediate signs of a surgical emergency like **anastomotic leak** or **bowel obstruction**.
- Addressing the likely **hypovolemia** is more urgent and should precede further imaging in this scenario.
*Start ciprofloxacin*
- The patient does not show signs of infection, such as fever or localized signs of bacterial peritonitis, making **antibiotics** like ciprofloxacin inappropriate as the initial management step.
- The elevated BUN and creatinine are more indicative of volume depletion than infection.
Urinary complications US Medical PG Question 10: A 55-year-old man presents to his primary care physician for a wellness checkup. The patient has a past medical history of alcohol abuse and is currently attending alcoholics anonymous with little success. He is currently drinking roughly 1L of hard alcohol every day and does not take his disulfiram anymore. Which of the following findings is most likely to also be found in this patient?
- A. Dysdiadochokinesia (Correct Answer)
- B. Microcytic anemia
- C. Constipation
- D. Decreased CNS NMDA activity
- E. Increased transketolase activity
Urinary complications Explanation: ***Dysdiadochokinesia***
- Chronic **alcohol abuse** can lead to cerebellar degeneration, a condition characterized by damage to the **cerebellum**.
- **Dysdiadochokinesia**, the impaired ability to perform rapidly alternating movements, is a classic sign of **cerebellar dysfunction**.
*Microcytic anemia*
- **Chronic alcohol abuse** typically causes **macrocytic anemia** due to folate deficiency, or less commonly, iron deficiency anemia from gastrointestinal bleeding.
- **Microcytic anemia** is usually associated with **iron deficiency** (often due to chronic blood loss) or **thalassemia**, neither of which are suggested here.
*Constipation*
- While various factors can cause constipation, **chronic alcohol abuse** is more commonly associated with **diarrhea** due to alterations in gut motility and malabsorption.
- Constipation is not a direct or prominent feature of **alcoholism**.
*Decreased CNS NMDA activity*
- **Chronic alcohol abuse** leads to an **upregulation of NMDA receptors** in the brain as a compensatory mechanism against alcohol's inhibitory effects on the central nervous system.
- When alcohol consumption ceases, this upregulated NMDA activity contributes to the **excitatory symptoms of alcohol withdrawal**, such as seizures and delirium tremens.
*Increased transketolase activity*
- **Transketolase activity** is usually **decreased** in chronic alcoholics due to **thiamine deficiency**, as thiamine (vitamin B1) is a critical cofactor for this enzyme.
- A **decrease** in transketolase activity is a key diagnostic indicator for thiamine deficiency, which contributes to conditions like **Wernicke-Korsakoff syndrome**.
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