A 63-Year-Old Man Comes to the Office for Routine Follow-Up

question 256

Multiple Choice

A 63-year-old man comes to the office for routine follow-up a month after being prescribed morphine for chronic, treatment-resistant back pain.  The patient says that his pain is greatly reduced since starting the morphine.  He has been able to begin a light exercise regimen for the first time in over 2 years.  His other medical conditions include hypertension, type 2 diabetes mellitus, allergic rhinitis, and major depressive disorder.  Temperature is 36.1 C (97 F) , blood pressure is 118/84 mm Hg, pulse is 62/min, and respirations are 12/min.  The patient has normal range of motion of the spine, and movement is associated with a reduction in pain compared with previous examinations.  As part of prescription drug misuse monitoring, the physician performs a random urine drug screen that is positive for opioids and phencyclidine (PCP) .  The patient insists that he is not taking PCP.  Which of the following medications could be causing a false-positive result on his urine drug screen?

• A)Atenolol
• B)Bupropion
• C)Dextromethorphan
• D)Phenylephrine
• E)Propranolol

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Definitions:

Ideal Free Distribution

A theory suggesting that animals distribute themselves among resources in a way that maximizes their individual access to resources without competition.

Intraspecific Competition

Competition for resources among members of the same species, which can influence survival, reproduction, and population dynamics.

Reproductive Success

The successful production of viable offspring by an organism, contributing to its genetic representation in the future generations.

Resource-Holding Potential

The ability of an individual or group to control valuable resources against competitors, often affecting mating success and survival.