Which one of the following is most true about psychological aging?

What medication should be avoided when prescribing prophylactic therapy for headaches?

An 82-year-old man, Mr. A, complains of worsening nocturia, occurring four times per night. His other lower urinary tract symptoms are slow stream, occasional urgency, and urgency-related leakage once weekly. Medical problems include poorly controlled hypertension, diastolic heart failure, hyperlipidemia, osteoarthritis, and prediabetes. His medications include lisinopril 20 mg daily, metoprolol succinate 75 mg daily, atorvastatin 10 mg daily, metformin 500 mg twice daily, hydrocodone-acetaminophen as needed, and aspirin 81 mg daily. Amlodipine 5 mg daily was recently added by his cardiologist. On review of systems, Mr. A complains that nocturia is causing daytime fatigue, and he is more constipated. Physical examination is notable for blood pressure 162/83 mmHg, heart rate 60 beats per minute, clear lungs, soft abdomen, enlarged prostate, and 21 pre-tibial edema.

An 80-year-old woman has no weight loss, no pain, and no distention but over 2 years increasingly complains of constipation despite adequate medical treatment. A colonoscopy is negative. An abdominal CT is performed. It reveals well-circumscribed pelvic masses, the largest adherent to the ovarian ligament. The best first step is:

What is the primary cause of hypovolemic shock?