Which of the following is a common cause of secondary osteoporosis?

Correct Answer: A

Rationale: Rheumatoid arthritis is a common cause of secondary osteoporosis. Chronic inflammation in rheumatoid arthritis can lead to bone loss due to increased osteoclast activity and decreased bone formation. Patients with rheumatoid arthritis are at an increased risk for developing osteoporosis, resulting in decreased bone density and increased fracture risk. Monitoring and managing bone health is an important aspect of care for individuals with rheumatoid arthritis to help prevent osteoporosis-related complications.

Correct Answer: B

Rationale: Urinary incontinence is a common complication associated with prostatectomy for the treatment of benign prostatic hyperplasia (BPH). Prostate surgery, such as a prostatectomy, can disrupt the sphincter muscle that controls the flow of urine from the bladder, leading to temporary or even long-term urinary incontinence in some patients. This usually improves over time with pelvic floor exercises and other treatment options, but it is an important consideration when discussing the potential risks and benefits of prostate surgery with patients. While erectile dysfunction and retrograde ejaculation can also be potential side effects of prostate surgery, urinary incontinence is specifically associated with issues related to bladder control following the procedure. Urethral stricture, although it can occur post prostate surgery, is less common compared to urinary incontinence.

Correct Answer: B

Rationale: Nephrotic syndrome is a kidney disorder characterized by increased glomerular permeability, leading to protein loss in the urine. One of the hallmarks of nephrotic syndrome is hypoalbuminemia, which refers to low levels of albumin in the blood due to its excessive loss in the urine. This loss of albumin results in decreased oncotic pressure, leading to edema and ascites. Hematuria (choice A) is not typically found in nephrotic syndrome but may be present in other kidney conditions. Hyperkalemia (choice C) is not specific to nephrotic syndrome and may be more common in conditions affecting potassium regulation. Hypocalcemia (choice D) is also not a characteristic feature of nephrotic syndrome.

Correct Answer: C

Rationale: The presentation described in the question, including the skin lesion resembling a "bull's eye" rash at the site of a tick bite, is characteristic of Lyme disease. Lyme disease is caused by the spirochete bacterium Borrelia burgdorferi, which is transmitted to humans through the bite of infected black-legged ticks (Ixodes scapularis). The symptoms of Lyme disease include fever, headache, myalgia, and the erythema migrans rash, which appears as a red circular rash with central clearing resembling a bull's eye.

Correct Answer: C

Rationale: The patient is likely infected with Cryptosporidium parvum based on the symptoms of watery diarrhea, abdominal cramps, and nausea after consuming contaminated water. Cryptosporidium is a protozoan parasite that can be transmitted through contaminated water sources, such as streams. Laboratory tests revealing oocysts in the stool sample further support the diagnosis of Cryptosporidium infection, as these oocysts are characteristic of this parasite. Giardia lamblia is another common protozoan parasite that can cause similar symptoms but is usually associated with more foul-smelling, greasy diarrhea. Entamoeba histolytica causes amoebic dysentery, which presents with bloody diarrhea and abdominal pain. Cyclospora cayetanensis also causes watery diarrhea, but it is usually associated with foodborne outbreaks rather than waterborne transmission.