AOCNP Radiation Therapy Principles and Side Effects 5

Question 1

A male patient completes prostate radiation therapy and reports erectile dysfunction 18 months later. The MOST likely etiology of this late effect is:

Accepted Answer

Radiation-induced fibrosis of the neurovascular bundles and penile vasculature

Answer

Late radiation-induced erectile dysfunction is primarily caused by damage to the neurovascular bundles lateral to the prostate and radiation arteritis affecting penile blood flow.

Question 2

Which grading system is most commonly used in clinical trials to standardize reporting of radiation therapy adverse effects?

Accepted Answer

NCI Common Terminology Criteria for Adverse Events (CTCAE)

Answer

The NCI CTCAE is the standard system used in oncology clinical trials to classify and grade adverse events including radiation-related toxicities.

Question 3

A patient with esophageal cancer develops odynophagia and dysphagia during the third week of concurrent chemoradiation. CT shows mucosal thickening of the esophagus without perforation. What is the most appropriate management?

Accepted Answer

Provide symptomatic management with viscous lidocaine, analgesics, and nutritional support

Answer

Acute radiation esophagitis is expected during chemoradiation for esophageal cancer and is managed symptomatically with analgesics, mucosal coating agents, and nutritional optimization while continuing treatment.

Question 4

In brachytherapy for cervical cancer, the point 'Point A' is used to prescribe dose. Where is Point A located?

Accepted Answer

2 cm superior to the cervical os and 2 cm lateral to the uterine canal

Answer

Point A is defined as 2 cm superior to the cervical os (or vaginal fornix) and 2 cm lateral to the uterine canal, representing the region of the parametria and paracervical triangle.

Question 5

Which of the following radiation sensitizers works by mimicking oxygen and thereby enhancing radiation-induced DNA damage in hypoxic tumor cells?

Accepted Answer

Nimorazole

Answer

Nimorazole is a nitroimidazole hypoxic cell sensitizer that mimics oxygen, fixing radiation-induced free radical damage in hypoxic tumor cells that would otherwise be repaired.

AOCNP - Advanced Oncology Certified Nurse Practitioner Practice Test

AOCNP - Advanced Oncology Certified Nurse Practitioner Practice Test

AOCNP Radiation Therapy Principles and Side Effects 5