Inpatient Diabetes Management — MCQs

10 questions

What is the most appropriate insulin regimen for achieving tight control of blood sugar levels in a 20-year-old male with type 1 diabetes mellitus?

What is the fasting blood glucose level that confirms a diagnosis of diabetes mellitus?

In which of the following situations is intensive management of diabetes typically avoided?

A patient with diabetes mellitus for the past 5 years presents with vomiting and abdominal pain. She is non-compliant with medication and appears dehydrated. Investigations revealed a blood sugar value of 500 mg/dl and the presence of ketone bodies. What is the next best step in management of this patient?

In a comatose patient with a blood glucose level of 750 mg/dL, which test is most important to perform in addition to serum potassium?

In a patient presenting with diabetic ketoacidosis (DKA), what is the most appropriate immediate treatment?

A G1 P0 woman at 36 weeks presents with newly diagnosed gestational diabetes. What is the most appropriate initial management?

Which of the following insulin preparations has the longest duration of action?

Insulin of choice for the treatment of diabetic ketoacidosis is:

Q10

All of the following are selective indications for the use of hypotonic solutions, except:

Inpatient Diabetes Management Indian Medical PG Practice Questions and MCQs

Question 1: What is the most appropriate insulin regimen for achieving tight control of blood sugar levels in a 20-year-old male with type 1 diabetes mellitus?

A. Morning injections of insulin detemir with insulin aspart at mealtimes. (Correct Answer)
B. Morning injection of NPH insulin and evening injection of regular insulin.
C. Morning injections of insulin lispro with evening injections of insulin glulisine.
D. Evening injections of mixed regular insulin and insulin glargine for basal control.

Explanation: **Morning injections of insulin detemir with insulin aspart at mealtimes.** - This regimen involves a **long-acting basal insulin (insulin detemir)** to provide continuous background insulin coverage and a **rapid-acting insulin (insulin aspart)** to cover carbohydrate intake at meals, allowing for **tight glycemic control** and flexibility [1]. - This approach closely mimics the body's natural insulin secretion patterns, which is critical for managing **Type 1 Diabetes Mellitus** effectively in a young, active individual [1]. *Morning injection of NPH insulin and evening injection of regular insulin.* - **NPH insulin** is an intermediate-acting insulin with a less predictable peak and duration compared to long-acting analogs, making **tight control** more challenging due to increased risk of hypoglycemia and hyperglycemia. - Using **regular insulin** for the evening, without specific mealtime dosing, is less flexible and precise for managing postprandial glucose excursions compared to rapid-acting insulins. *Morning injections of insulin lispro with evening injections of insulin glulisine.* - Both **insulin lispro** and **insulin glulisine** are rapid-acting insulins designed to be taken with meals; using them as basal insulin without a separate long-acting component would lead to **poor basal control** and a high risk of hypoglycemia. - This regimen lacks a proper **basal insulin** component, which is essential for maintaining fasting glucose levels and preventing hyperglycemia between meals. *Evening injections of mixed regular insulin and insulin glargine for basal control.* - **Regular insulin** is a short-acting insulin and not suitable for basal control; its inclusion in a mixed dose for basal control would lead to significant fluctuations and difficulties in achieving stable glucose levels. - While **insulin glargine** is a good basal insulin, mixing it with regular insulin is generally not recommended as it can alter the **pharmacokinetic profile** of both insulins and complicate dosing [1].

Question 2: What is the fasting blood glucose level that confirms a diagnosis of diabetes mellitus?

A. >200
B. <100
C. ≥126 (Correct Answer)
D. 101-125

Explanation: ≥126 - A fasting plasma glucose (FPG) level of ≥126 mg/dL on two separate occasions is a diagnostic criterion for diabetes mellitus [1]. - This threshold indicates persistent hyperglycemia beyond what is considered normal. <100 - A fasting plasma glucose level <100 mg/dL is considered normal and does not indicate diabetes or prediabetes [1]. - This range reflects healthy glucose regulation in the body. 101-125 - A fasting plasma glucose level between 100-125 mg/dL indicates prediabetes or impaired fasting glucose (IFG) [1]. - While not diabetes, it signifies an increased risk for developing type 2 diabetes. >200 - A random plasma glucose (RPG) level >200 mg/dL with classic symptoms of diabetes (e.g., polyuria, polydipsia, unexplained weight loss) can confirm diabetes [1]. - However, for a fasting blood glucose alone to confirm diabetes, it needs to be ≥126 mg/dL, and a level >200 mg/dL would be an even more severe manifestation.

Question 3: In which of the following situations is intensive management of diabetes typically avoided?

A. Stable diabetes with no complications
B. Diabetes in a well-controlled state
C. Diabetes with stable renal function post-transplant
D. Diabetes with acute myocardial infarction (Correct Answer)

Explanation: Diabetes with acute myocardial infarction - In the setting of **acute myocardial infarction (AMI)**, aggressive **glucose lowering** can increase the risk of **hypoglycemia** and is generally avoided due to potential for worse outcomes [1]. - The primary focus in AMI is on cardiovascular stabilization, and overly tight glycemic control can lead to **metabolic stress** and adverse events, particularly in patients with a high prevalence of cardiovascular disease [1]. *Stable diabetes with no complications* - Patients with **stable diabetes** and no complications are often candidates for **intensive management** to prevent long-term microvascular and macrovascular complications [1]. - The goal is to maintain near-normal glucose levels to reduce the risk of future disease progression [1]. *Diabetes in a well-controlled state* - **Well-controlled diabetes** usually indicates that current management is effective, but further **intensification** might be considered to achieve optimal glycemic targets and minimize long-term risks if there's room for improvement. - This scenario does not inherently contraindicate intensive management, as it could still benefit from fine-tuning to achieve even tighter control without undue risk. *Diabetes with stable renal function post-transplant* - Patients with **diabetes** and stable **renal function post-transplant** often require careful but often intensive diabetes management to preserve graft function and prevent cardiovascular complications. - While medication adjustments are necessary due to altered renal clearance, the goal remains to achieve good glycemic control, potentially through intensive strategies.

Question 4: A patient with diabetes mellitus for the past 5 years presents with vomiting and abdominal pain. She is non-compliant with medication and appears dehydrated. Investigations revealed a blood sugar value of 500 mg/dl and the presence of ketone bodies. What is the next best step in management of this patient?

A. Intravenous fluids
B. Intravenous insulin
C. Intravenous fluids with regular insulin (Correct Answer)
D. Intravenous fluids with long-acting insulin

Explanation: Detailed management of diabetic ketoacidosis (DKA) requires both fluid resuscitation and insulin therapy. ***Intravenous fluids with regular insulin*** - The patient presents with classic signs of **diabetic ketoacidosis (DKA)**: hyperglycemia (blood sugar 500 mg/dl), ketone bodies, dehydration, and a history of diabetes non-compliance [1]. - Initial management for DKA involves aggressive **intravenous fluid resuscitation** to correct dehydration and then **intravenous regular insulin** to lower blood glucose and resolve ketosis [2]. *Intravenous fluids with long-acting insulin* - While fluids are essential, **long-acting insulin** is not appropriate for the acute management of DKA because its slow onset of action makes it inefficient for rapidly correcting hyperglycemia and ketosis. - **Regular insulin** is preferred as it has a quicker onset and shorter duration, allowing for more precise titration in an acute setting [2]. *Intravenous fluids* - Although crucial for correcting **dehydration** and improving renal perfusion, fluids alone will not address the underlying **insulin deficiency** and **ketosis** that define DKA. - Without insulin, the body will continue to produce ketones, exacerbating acidosis [3]. *Intravenous insulin* - Giving intravenous insulin without prior or concomitant **fluid resuscitation** can be dangerous, as it can worsen **hypovolemia** and potentially lead to circulatory collapse by shifting glucose and potassium into cells. - It is critical to first restore **circulating volume** before initiating insulin therapy [2].

Question 5: In a comatose patient with a blood glucose level of 750 mg/dL, which test is most important to perform in addition to serum potassium?

A. Serum creatinine
B. Serum sodium
C. Serum ketones
D. Arterial blood gases (Correct Answer)

Explanation: ***Arterial blood gases*** - In a comatose patient with severe hyperglycemia (750 mg/dL), **arterial blood gases (ABGs)** are crucial to assess for **acidosis**, which could indicate **diabetic ketoacidosis (DKA)** or **hyperosmolar hyperglycemic state (HHS)** with lactic acidosis [1], [4]. - The **pH**, **bicarbonate (HCO3-)**, and **pCO2** levels from ABGs help determine the severity and type of metabolic derangement, guiding immediate treatment, especially for potential **cerebral edema** [3], [4]. *Serum creatinine* - While important for assessing **kidney function** in hyperosmolar states, it does not directly evaluate the immediate acid-base status that is critical for neurologic function in a comatose patient. - Renal insufficiency can exacerbate electrolyte imbalances and fluid overload but is secondary to the immediate need for acid-base assessment. *Serum sodium* - **Serum sodium** is important for calculating **effective serum osmolality**, which is elevated in both DKA and HHS, contributing to mental status changes [2]. - However, while important, it does not provide information about the **acid-base balance**, which is a more critical determinant of immediate neurologic stability and treatment in deep coma. *Serum ketones* - **Serum ketones** are essential for distinguishing between **DKA** (high ketones) and **HHS** (low or absent ketones) [4]. - While vital for diagnosis, ketones alone do not give the full picture of **acid-base status** (pH, bicarbonate) which is directly assessed by ABGs and more immediately actionable in managing a severely ill, comatose patient [1].

Question 6: In a patient presenting with diabetic ketoacidosis (DKA), what is the most appropriate immediate treatment?

A. Administration of an oral hypoglycemic agent
B. Administration of bicarbonate
C. Administration of insulin (Correct Answer)
D. Close observation only

Explanation: ***Administration of insulin*** - **Insulin therapy** is critical in DKA to reverse the underlying metabolic abnormalities by stopping ketogenesis and facilitating glucose uptake into cells [1]. - It is typically administered intravenously at a continuous rate, after initial **fluid resuscitation**, to gradually lower blood glucose and resolve acidosis [1]. *Administration of an oral hypoglycemic agent* - **Oral hypoglycemic agents** are ineffective in DKA because these patients typically have an absolute or relative **insulin deficiency** and **profound insulin resistance** due to stress hormones [3]. - Moreover, they are not suitable for acutely ill patients who may have impaired gastrointestinal absorption. *Administration of bicarbonate* - **Bicarbonate administration** is generally not recommended in DKA unless the **pH is extremely low** (e.g., < 6.9 or 7.0) due to potential risks like paradoxical central nervous system acidosis and fluid overload. - The acidosis usually resolves with **insulin therapy** and **fluid resuscitation** as ketone body production ceases and they are metabolized [1]. *Close observation only* - **Diabetic ketoacidosis** is a medical emergency requiring urgent and aggressive intervention, not just observation [2]. - Delaying treatment can lead to severe complications, including **cerebral edema**, **coma**, and **death** [2].

Question 7: A G1 P0 woman at 36 weeks presents with newly diagnosed gestational diabetes. What is the most appropriate initial management?

A. Induction of labor
B. Oral hypoglycemics
C. Diet control (Correct Answer)
D. Insulin

Explanation: ***Diet control (Medical Nutrition Therapy)*** - For newly diagnosed gestational diabetes, **lifestyle modifications**, primarily **dietary changes**, are the **first-line treatment** per ACOG and ADA guidelines - Medical nutrition therapy (MNT) aims to control blood glucose levels through proper nutrition and should be attempted for **1-2 weeks** before considering pharmacologic interventions - Target goals: Fasting glucose <95 mg/dL, 1-hour postprandial <140 mg/dL, 2-hour postprandial <120 mg/dL *Induction of labor* - **Induction of labor** is typically considered for gestational diabetes if there are concerns about **fetal macrosomia** (EFW >4000-4500g), **poor glycemic control despite treatment**, or other maternal-fetal complications - Generally considered at **39-40 weeks** in well-controlled GDM or earlier with complications - Not the initial management for a new diagnosis at 36 weeks without additional concerning features *Oral hypoglycemics* - **Metformin** or **glyburide** may be used as second-line agents when **dietary management fails** to achieve adequate glycemic control after 1-2 weeks - Metformin is increasingly preferred as it does not cross the placenta as readily as glyburide - They are **not the initial step** in management *Insulin* - **Insulin therapy** is indicated when **dietary modifications alone** are insufficient in maintaining target blood glucose levels - Also preferred if oral agents are contraindicated or fail to achieve glycemic targets - Represents a **secondary intervention** when primary non-pharmacological methods are inadequate

Question 8: Which of the following insulin preparations has the longest duration of action?

A. Insulin degludec (Correct Answer)
B. Insulin glargine
C. Isophane insulin (NPH)
D. Insulin detemir

Explanation: ***Insulin degludec*** - **Insulin degludec** forms multi-hexamer chains upon subcutaneous injection, leading to a slow and continuous release of monomers and providing the longest duration of action among available insulin preparations, often exceeding **42 hours**. - Its unique mechanism of action allows for once-daily dosing with less variability and a flatter, more stable pharmacokinetic profile compared to other basal insulins. *Insulin glargine* - **Insulin glargine** precipitates in subcutaneous tissue at physiological pH, forming micro-precipitates from which insulin is slowly absorbed, providing a duration of action of approximately **24 hours**. - Although it is a long-acting insulin, its duration is typically less than that of insulin degludec, and it usually requires once-daily administration. *Insulin detemir* - **Insulin detemir** binds reversibly to albumin in the blood, which delays its absorption and degradation, resulting in a duration of action around **12-24 hours**, depending on the dose. - Due to its variable duration, insulin detemir may sometimes require twice-daily dosing in some patients to maintain basal insulin coverage. *Isophane insulin (NPH)* - **Isophane insulin (NPH)** is an intermediate-acting insulin preparation that is formulated with protamine, which delays its absorption, giving it a duration of action of approximately **10-18 hours**. - NPH insulin has a more pronounced peak action compared to newer long-acting analogues, which can lead to a higher risk of nocturnal hypoglycemia.

Question 9: Insulin of choice for the treatment of diabetic ketoacidosis is:

A. Insulin lispro
B. Insulin glargine
C. NPH insulin
D. Regular Insulin (Correct Answer)

Explanation: ***Regular Insulin*** - **Regular insulin** is the insulin of choice for treating **diabetic ketoacidosis (DKA)** because it can be administered intravenously. - Its **short onset of action** and predictable duration allow for rapid and precise titration in a critical care setting. *Insulin lispro* - **Insulin lispro** is a **rapid-acting insulin analog** typically used for mealtime coverage, which has a very quick onset and short duration. - While it acts quickly, its primary use is not for the continuous intravenous infusion required in DKA management. *Insulin glargine* - **Insulin glargine** is a **long-acting insulin analog** designed to provide basal insulin replacement. - It has a prolonged duration of action and a slow, sustained release profile, making it unsuitable for the rapid correction needed in DKA. *NPH insulin* - **NPH insulin** is an **intermediate-acting insulin** that has a delayed onset and peak effect. - Its insoluble nature and variable absorption make it inappropriate for the acute, immediate intravenous insulin therapy required in DKA.

Question 10: All of the following are selective indications for the use of hypotonic solutions, except:

A. Burns (Correct Answer)
B. Free water deficit
C. Hypernatremia
D. Maintenance fluid therapy in stable patients

Explanation: ***Burns*** - **Hypotonic solutions** are generally *not* indicated for burn patients because these patients typically lose large amounts of **isotonic fluid** through damaged skin. [1] - The primary goal in burn resuscitation is to replace lost plasma volume with **isotonic crystalloids** (e.g., Lactated Ringer's) to prevent **hypovolemic shock**. [1] *Hypernatremia* - **Hypernatremia** is a condition of excess sodium relative to water, meaning the body has a **water deficit**. [1] - **Hypotonic solutions** are used to gradually lower serum sodium by providing **free water** to dilute the excess sodium. *Free water deficit* - A **free water deficit** indicates a lack of pure water relative to solutes, leading to increased plasma osmolality. [2] - **Hypotonic solutions** are specifically designed to provide **free water** to correct this deficit and restore proper fluid balance. *Maintenance fluid therapy in stable patients* - For stable patients requiring maintenance fluids, **hypotonic solutions** (e.g., D5W with 0.45% NS) are often used to cover obligatory fluid losses and provide adequate water without causing **sodium overload**. [1] - In such cases, the goal is to prevent dehydration and electrolyte imbalances over time, which often requires a balance of electrolytes and **free water**. [1]

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free