Logan Reid
Hyperglycemia, defined as a blood glucose concentration greater than 140 mg/dL, is observed in 22-46% of non-critically ill hospitalized patients. This condition is not exclusive to those with a diabetes diagnosis but can also be caused by stress hyperglycemia or previously undiagnosed diabetes. Several factors can contribute to hyperglycemia, including insufficient insulin or diabetes medication, improper insulin injection, or illness and stress, which cause blood sugar to rise. Uncontrolled blood glucose levels in hospitalized patients can lead to adverse effects such as impaired wound healing, increased infection risk, and delays in surgical procedures or hospital discharge.
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What You'll Learn
Hyperglycemia and diabetes
Hyperglycemia, or high blood glucose, is a condition in which the body has too little insulin or cannot use insulin properly. Insulin is a hormone produced by the pancreas that helps glucose enter the body's cells, where it is used for energy. In people with diabetes, glucose can build up in the bloodstream, leading to hyperglycemia. This is because diabetes reduces the effects of insulin, with the body becoming resistant to insulin or the pancreas being unable to produce enough insulin. Type 1 diabetes occurs when the pancreas cannot produce insulin, while Type 2 diabetes is when the body does not make enough insulin or is resistant to its effects.
Several factors can contribute to hyperglycemia in people with diabetes, including not using enough insulin or other diabetes medication, not injecting insulin properly, or illness and stress. Hormones produced by the body to fight illness or stress can cause blood sugar to rise. Therefore, people with diabetes may need to take extra medication to maintain healthy blood glucose levels during these periods.
The early symptoms of hyperglycemia include polyuria, polydipsia, and weight loss. As blood glucose levels increase, neurological symptoms can develop, including lethargy, focal neurological deficits, and altered mental status. If left untreated, hyperglycemia can lead to serious and life-threatening complications, such as damage to the eyes, kidneys, nerves, heart, and peripheral vascular system. It can also cause diabetic ketoacidosis, a condition where the body breaks down fat for energy, producing toxic acids called ketones that build up in the blood and can lead to a diabetic coma.
The best way to manage hyperglycemia is to practice good diabetes management and learn to detect and treat hyperglycemia early. This includes regularly checking blood glucose levels and maintaining a healthy diet and exercise routine. If hyperglycemia is detected early and properly treated, many of the associated complications can be avoided.
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Stress and illness
SIH is triggered by an interplay of cytokines and hormones, leading to insulin resistance and decreased insulin secretion. This results in elevated blood glucose levels, which can be challenging to manage and may require external insulin administration. Counterregulatory hormones, such as catecholamines, cortisol, glucagon, and growth hormones, disrupt glucose homeostasis. Additionally, stress can inhibit muscles and white adipose tissue from utilising glucose, further contributing to hyperglycemia.
Chronic stress can have long-term effects, including lean body mass loss, insulin resistance, and visceral fat accumulation. It can also lead to glucocorticoid production, which interferes with the action of GLUT-4, a glucose transporter in muscles. This interference results in reduced skeletal muscle glucose absorption and increased blood glucose levels. Furthermore, glucocorticoids stimulate lipolysis in white adipose tissue, leading to the accumulation of non-esterified fatty acids within muscle cells and further reducing glucose uptake.
The impact of stress on blood glucose levels is not limited to hospital settings. Everyday stress, physical activity, sleep patterns, diet, and emotional well-being can all influence metabolic function and blood glucose spikes. Proper stress management through lifestyle changes, relaxation techniques, and adequate sleep can help mitigate these effects.
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Insulin and medication
Insulin is a hormone made by the pancreas. It plays a key role in regulating blood glucose levels by allowing glucose to enter the body's cells, where it is used for fuel. When blood glucose levels rise, the pancreas releases insulin, which unlocks the cells so that glucose can enter. This lowers blood glucose levels and prevents them from reaching dangerous levels.
In people with diabetes, insulin injections and other medications are used to manage blood glucose levels. Insulin dosing depends on several factors, including the patient's previous experience with insulin, baseline diabetes control, and renal function. Some patients may only require a basal insulin dose, while others may benefit from additional short-acting premeal doses.
Maintaining proper insulin dosing and medication adherence is crucial for managing blood glucose levels. Inconsistent dosing or using expired insulin can contribute to hyperglycemia. Additionally, during illness or stressful events, hormones released by the body can cause blood glucose levels to rise, requiring adjustments in medication to maintain target glucose levels.
Oral diabetes medications, such as metformin, are also used in the management of blood glucose. However, their use in hospitalized patients is controversial due to concerns about potential adverse effects, particularly in those with renal or hepatic impairment. Nonetheless, oral diabetes medications offer important nonglycemic benefits and can help reduce the risk of wide fluctuations in blood glucose levels.
Overall, insulin therapy and medication management are essential components of controlling blood glucose levels, especially in hospitalized patients with diabetes or hyperglycemia, to prevent complications and improve patient outcomes.
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Complications and risks
Uncontrolled blood glucose levels in hospitalised patients with diabetes are associated with several potential harms and complications. These include poor wound healing, an increased risk of infection, and delays in surgical procedures or discharge from the hospital. In addition, patients with diabetes have a 3-4 times greater chance of hospitalisation than those without.
Several studies have found a correlation between hyperglycaemia and poor clinical outcomes, including mortality, infections, and hospital complications. Patients with hyperglycaemia, whether with or without diabetes, face an increased risk of in-hospital mortality, postoperative infections, neurologic events, intensive care unit admission, and longer hospital stays. The risk of complications increases by 3% for every 18 mg/dL increase in admission glucose.
Hyperglycaemia can be caused by illness or stress, as the hormones produced by the body to combat these can cause blood sugar to rise. If left untreated, it can lead to serious conditions such as diabetic ketoacidosis, where the body breaks down fat for energy instead of using glucose, resulting in a buildup of toxic ketones in the blood and urine. Another potential complication is the hyperosmolar hyperglycaemic state, where the body produces insulin but it doesn't work properly, leading to extremely high blood glucose levels. This condition can be life-threatening, causing dehydration and coma if not treated promptly.
While tight blood glucose control using intensive insulin therapy has been associated with a reduced risk of morbidity and mortality in critically ill surgical patients, it has also been linked to an increased risk of hypoglycaemia, particularly in non-critically ill patients. This highlights the importance of glycemic control in managing hospitalised patients with diabetes and preventing adverse outcomes.
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Blood glucose management
Hyperglycaemia, defined as a blood glucose concentration greater than 140 mg/dL, is prevalent in 22-46% of non-critically ill hospitalised patients. It can be caused by relative insulin deficiency, triggered by the metabolic stress of acute illness, which in turn causes immune dysfunction, oxidative stress, and impaired wound healing. This can lead to an increased risk of infection, longer hospital stays, and higher admission rates to intensive care units.
To manage blood glucose levels in hospitalised patients, physicians must identify blood glucose targets, use oral diabetes medications judiciously, and implement appropriate insulin regimens. The use of oral diabetes medications, such as metformin, is controversial in hospitalised patients due to the risk of renal or hepatic failure. However, these medications have important non-glycaemic benefits and can help reduce the risk of fluctuating blood glucose levels.
Insulin dosing depends on various factors, including the patient's previous experience with insulin, baseline diabetes control, renal function, current oral intake, comorbidities, and other medications. While some patients may only require a basal insulin dose, others may benefit from additional short-acting premeal doses. It is important to monitor blood glucose levels regularly, especially in patients with diabetes, to prevent hyperglycaemia and its potential complications.
Overall, effective blood glucose management in hospitalised patients requires a personalised approach, considering the patient's medical history, current health status, and potential risks associated with different treatment options.
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Frequently asked questions
Blood glucose can increase in hospitals due to the relative insulin deficiency arising from the metabolic stress of acute illness. Illness or stress can trigger hyperglycemia as the hormones produced to fight illness or stress can cause blood sugar to rise.
Hyperglycemia is defined as a blood glucose concentration greater than 140 mg/dL. It is usually found in people with diabetes, but it can also occur in those with stress hyperglycemia or previously undiagnosed diabetes.
Symptoms of hyperglycemia develop slowly over several days or weeks. Some symptoms include increased urination, ketoacidosis, and high blood acidity. If left untreated, hyperglycemia can lead to serious complications and even mortality.
Managing hyperglycemia in hospitals involves identifying blood glucose targets, using oral diabetes medications, and implementing insulin regimens. However, the use of oral medications like metformin is controversial due to the risk of renal or hepatic failure.
