Which medication is recognized by the Registered Nurse (RN) as a dilator for both arteries and veins?

Choice A rationale:

Respiratory distress is not a direct side effect of metformin. While metformin can cause a rare condition called lactic acidosis, which can lead to rapid breathing, respiratory distress is not a primary concern with metformin use.

Respiratory distress typically involves difficulty breathing due to other causes such as asthma, pneumonia, heart failure, or chronic obstructive pulmonary disease (COPD).

Choice B rationale:

Seizures are not a known side effect of metformin.

Seizures are typically associated with neurological conditions, such as epilepsy, or metabolic disturbances such as hypoglycemia or electrolyte imbalances.

Metformin does not directly affect the central nervous system in a way that would increase the risk of seizures.

Choice C rationale:

Lactic acidosis:

This is a rare but serious condition that can occur with metformin use.

It happens when lactic acid builds up in the bloodstream, causing the blood to become too acidic. Symptoms of lactic acidosis include:

Rapid breathing Nausea and vomiting Abdominal pain Muscle weakness Unusual sleepiness Feeling cold

Risk factors for lactic acidosis in patients taking metformin include:

Kidney disease Congestive heart failure Liver disease Dehydration

Excessive alcohol intake Recent surgery or heart attack

It's important to note that lactic acidosis is rare, occurring in about 3 to 10 cases per 100,000 people taking metformin per year.

Renal failure:

Metformin is primarily eliminated by the kidneys.

If kidney function is impaired, metformin can build up in the body, increasing the risk of lactic acidosis. Additionally, metformin can potentially cause kidney damage in rare cases, further worsening kidney function. It's crucial to monitor kidney function regularly in patients taking metformin.

Choice D rationale:

Hyperglycemia (high blood sugar) is not a side effect of metformin.

In fact, metformin is a medication used to lower blood sugar levels in people with type 2 diabetes. It works by:

Decreasing the amount of glucose produced by the liver Improving the body's sensitivity to insulin

Slowing the absorption of glucose from the intestines

Choice A rationale:

Incorrect. Insulin pumps should be removed before bathing or swimming to prevent damage to the device. Water can enter the pump through the infusion set or through the battery compartment, causing it to malfunction. This can lead to inaccurate insulin delivery, which can result in hyperglycemia or hypoglycemia.

Additionally, the adhesive that holds the infusion set in place may not stick well to wet skin, which can increase the risk of the infusion set falling out.

It is important to note that some insulin pumps are now waterproof and can be worn while bathing or swimming. However, it is still important to check the manufacturer's instructions before doing so.

Choice B rationale:

Correct. Even though insulin pumps deliver insulin continuously, people who use them still need to monitor their blood glucose levels regularly. This is because many factors can affect blood glucose levels, such as food intake, exercise, stress, and illness.

Monitoring blood glucose levels allows people to adjust their insulin doses as needed to keep their blood glucose levels within a target range.

Recommended frequency of blood glucose monitoring:

Before meals and snacks Two hours after meals At bedtime

Before and after exercise During times of illness or stress

Whenever they feel symptoms of hypoglycemia or hyperglycemia

Choice C rationale:

Incorrect. People who use insulin pumps still need to count carbohydrates. This is because the amount of insulin that is needed to cover a meal depends on the amount of carbohydrates in the meal.

The insulin pump can be programmed to deliver different amounts of insulin for different meals, snacks, and corrections based on carbohydrate intake. This allows for more precise insulin dosing and better blood glucose control.

Choice D rationale:

Incorrect. Insulin pumps are not designed to help people lose weight. They are designed to help people manage their blood glucose levels.

While some people may lose weight when they start using an insulin pump, this is usually due to improved blood glucose control rather than the pump itself.