A nurse learns that which of the following is the single biggest risk factor for developing cancer?

Choice A rationale:
While a young patient who lives alone may need some assistance with post-discharge care, they have nearby family and friends who can likely provide this support. This patient's situation does not present the same level of complexity and risk as the other patients described in the options.
The presence of nearby family and friends can offer practical and emotional support, helping with tasks such as transportation, meal preparation, and medication management. This social support network can play a crucial role in ensuring a smooth transition from the hospital to home.
Additionally, the patient's young age suggests a higher likelihood of physical and cognitive abilities that can facilitate self-care and adherence to discharge instructions.
Choice B rationale:
The older adult who lives alone and has memory loss has the greatest need for the nurse to consult with other members of the healthcare team regarding post-discharge care. This patient's situation presents several significant challenges that necessitate a collaborative approach to ensure safety and well-being:
Memory loss: The patient's memory loss may impair their ability to follow discharge instructions, manage medications, and maintain personal safety. This raises concerns about potential medication errors, missed appointments, and risks of falls or accidents.
Living alone: The patient's lack of immediate support at home further compounds these risks. Without someone to provide reminders, assistance with tasks, or monitoring for changes in health status, the patient's vulnerability increases.
Potential for social isolation: Living alone with memory loss can also lead to social isolation, which can negatively impact mental and physical health.
Choice C rationale:
While a married young adult who is the primary caregiver for children may face challenges in balancing their own recovery with caregiving responsibilities, they have a spouse who can provide support and assistance. This patient's situation does not present the same degree of risk as the older adult with memory loss living alone.
Choice D rationale:
The middle-aged patient who has undergone knee replacement and requires physical therapy will need support and guidance, but their needs are primarily focused on physical rehabilitation and pain management. These needs can often be addressed through standard discharge planning and coordination with physical therapy services.

Choice A rationale:
Metabolic alkalosis is a condition characterized by an increase in the pH of the blood due to an excess of bicarbonate (HCO3-) in the body. It is not typically caused by severe diarrhea. In fact, diarrhea can often lead to a loss of bicarbonate, which can contribute to metabolic acidosis.
Causes of metabolic alkalosis include: excessive vomiting, use of diuretics, and excessive intake of alkali such as antacids. Clinical manifestations of metabolic alkalosis include: muscle twitching, paresthesias, seizures, confusion, and lethargy.
Choice B rationale:
Respiratory alkalosis is a condition characterized by a decrease in the partial pressure of carbon dioxide (PaCO2) in the blood, leading to an increase in blood pH. It is caused by hyperventilation, which removes excess CO2 from the body. Severe diarrhea does not typically cause hyperventilation.
Causes of respiratory alkalosis include: anxiety, hyperventilation syndrome, high altitude sickness, and pulmonary embolism. Clinical manifestations of respiratory alkalosis include: lightheadedness, dizziness, paresthesias, palpitations, and tetany.
Choice C rationale:
Respiratory acidosis is a condition characterized by an increase in the partial pressure of carbon dioxide (PaCO2) in the blood, leading to a decrease in blood pH. It is caused by hypoventilation, which prevents the body from removing enough CO2. Severe diarrhea does not typically cause hypoventilation.
Causes of respiratory acidosis include: chronic obstructive pulmonary disease (COPD), pneumonia, asthma, and neuromuscular disorders.
Clinical manifestations of respiratory acidosis include: headache, confusion, somnolence, and coma.
Choice D rationale:
Metabolic acidosis is a condition characterized by a decrease in the pH of the blood due to an excess of acid in the body or a loss of bicarbonate. Severe diarrhea can lead to metabolic acidosis through several mechanisms:
Loss of bicarbonate in the stool: Diarrhea often contains a significant amount of bicarbonate, which can be lost from the body in large amounts during severe diarrheal episodes. This loss of bicarbonate can lead to a decrease in the blood's pH, resulting in metabolic acidosis.
Dehydration: Severe diarrhea can also lead to dehydration, which can concentrate acids in the blood and contribute to metabolic acidosis.
Lactic acidosis: In some cases, severe diarrhea can also cause lactic acidosis, a type of metabolic acidosis that occurs when there is a buildup of lactic acid in the body. This can happen due to impaired circulation or tissue hypoxia, which can occur as a complication of severe diarrhea.