Diabetes Mellitus and Hypoglycemia Notes

Diabetes Mellitus and Hypoglycemia: Comprehensive Study Notes

Diabetes Mellitus: Overview

  • A lifelong condition that affects the body’s ability to use the energy found in food.

  • It is categorized into Type 1 and Type 2; both share a common core process:

    • Normally, carbohydrates and sugars are broken down into glucose to fuel cells.

    • Insulin is required to regulate blood glucose.

    • The body normally produces a small amount of insulin continuously, with a larger secretion after meals in response to carbohydrate intake.

    • In DM, the body either does not produce enough insulin or cannot use the insulin it produces.

    • Result: glucose builds up in the blood, causing hyperglycemia.

    • Most common Type 2 diabetes mellitus is characterized by insulin resistance and is often associated with obesity, physical inactivity, and a sedentary lifestyle.

Useful Terms

  • Endogenous insulin: Insulin produced inside the body.

  • Exogenous insulin: Insulin that comes from an external source and is administered to a person.

Hypo- / Hyperglycemia Symptoms

  • Hypoglycemia (low blood sugar) – Signs and symptoms include:

    • Sweating, trembling, dizziness, hunger, mood changes, dry mouth, nausea, extreme tiredness, paleness, blurred vision, etc.

  • Hyperglycemia (high blood sugar) – Signs and symptoms include:

    • Thirst, frequent urination, dry mouth, headaches, abdominal pain, blurred vision, drowsiness, fatigue, nausea, etc.

Type 1 Diabetes

  • Occurs when the pancreas cannot produce insulin.

  • Autoimmune destruction of pancreatic beta cells (where insulin is produced) by antibodies; beta cells are destroyed.

  • Possible causes: genetic predisposition, immunologic and environmental factors (e.g., viruses, toxins).

  • Risk factors other than genetic factors are not well-defined.

  • People with Type 1 will require lifelong exogenous insulin therapy; commonly referred to as “insulin-dependent diabetes.”

  • Not enough insulin so you give them insulin for the rest of there lifes

Type 1 Diabetes: Insufficient Insulin (Pathophysiology)

  • Pathway (conceptual): diminished insulin → reduced signaling at insulin receptors → ↓ Glut-4 translocation to fat/muscle cell membranes → ↓ glucose uptake into cells → elevated blood glucose.

  • Key components:

    • Diminished insulin

    • Reduced insulin receptor activity

    • Decreased Glut-4–mediated glucose uptake

Type 2 Diabetes

  • More common than Type 1.

  • Pathophysiology:

    • Pancreas produces some insulin, but not enough to meet body’s needs (inadequate endogenous insulin) or the body’s cells are resistant to insulin (insulin resistance).

    • Beta cells initially respond inadequately to hyperglycemia, leading to chronically elevated blood glucose.

    • High glucose eventually desensitizes beta cells, making them less responsive to glucose.

    • Receptor sites can also become resistant to insulin, preventing glucose entry into cells.

  • Management:

    • May be controlled by diet and exercise alone, or in combination with oral hypoglycemic agents or exogenous insulin.

    • Oral hypoglycemic agents increase cellular sensitivity to insulin.

Risk Factors for Type 2 Diabetes (cont’d)

  • Obesity

  • Sedentary lifestyle (couch potato)

  • Genetic predisposition / family history

  • Age ≥ 40 years

  • History of gestational diabetes mellitus (pregancy during)

  • History of delivering an infant > 10 lb anything bigger than 9 lbs

  • Certain ethnicities (see pg 1049) African Americans, Hispanics, Native American, Pacific Islanders

  • Polycystic ovarian syndrome (PCOS) is also associated with an increased risk of developing diabetes mellitus, particularly type 2 diabetes. puts people at risk becuase of insulin resistance and hormonal imbalances that can lead to impaired glucose metabolism. they go on metformin

  • Cardiovascular disease and hypertension are common comorbidities in individuals with diabetes mellitus, further complicating management and increasing the risk of serious complications if not effectively controlled.

  • Presence of acanthosis nigricans or other conditions associated with insulin resistance you will see darkening in the folds of the skin, particularly in areas such as the neck, armpits, and groin, indicating a possible underlying metabolic issue that requires further evaluation and management.

Long-Term Complications

Microvascular Complications

  • Retinopathy: changes in small vessels affecting the eyes; two types: non-proliferative and proliferative.

    • Non-Proliferative: small hemorrhages and aneurysms in the retina.

    • Proliferative: growth of abnormal capillaries on the retina and optic disc.

  • Nephropathy: diabetes is a leading cause of end-stage renal disease (ESRD) in the USA.

    • Glucosuria (glucose in urine) with hypertension damages glomerular capillaries.

    • Increased permeability → proteinuria; may progress to ESRD.

    • Early detection and treatment can slow progression.

Macrovascular Complications

  • Atherosclerotic changes associated with diabetes.

  • Caused by hyperglycemia and insulin resistance; lipids deposit in vessel walls.

  • Peripheral vascular disease can lead to poor oxygen delivery, gangrene, and possible amputation.

  • Management: weight loss, exercise, smoking cessation, and appropriate invasive treatments when indicated. Good blood glucose control

  • increased risk for cataracts and glaucoma

Neuropathic Complications

  • Neuropathy related to poor glucose control, ischemic nerve changes, and metabolic/chemical nerve injury.

  • Often causes impaired sensation in at least one area of the foot.

  • Types:

    • Mononeuropathy: affects a single nerve or nerve group.

    • Polyneuropathy: affects both legs symmetrically; can progress to other parts of the body including autonomic nervous system.

    • Autonomic neuropathy: affects autonomic nervous system (sympathetic and parasympathetic).

Foot Complications

  • Can result from neuropathy, inadequate blood supply, or both.

  • Patient teaching: daily foot checks for swelling, cuts, blisters, red spots; wash feet daily; keep skin moisturized but not between toes; wear shoes at all times; choose comfortable, supportive footwear; protect feet from extreme heat or cold.

  • use a mirror or have a family member

Hypoglycemic Unawareness and Prevention

  • Hypoglycemia signs may be absent in hypoglycemic unawareness, removing warning symptoms.

  • Low Blood Sugar levels can lead to dangerous situations if not recognized. It is crucial for individuals with diabetes to monitor their blood glucose regularly, especially if they have a history of unawareness.

  • Patients may have sudden mental status changes as a late sign.

  • Prevention focus: tight blood glucose control, normal blood pressure and cholesterol, smoking cessation, and regular physical activity are essential strategies to minimize the risk of hypoglycemia and its complications.

Acute Emergency Complications

Acute Hypoglycemia

  • Triggers: taking too much insulin, not eating enough, eating at the wrong time, inconsistent exercise pattern.

  • Signs and symptoms:

    • Adrenergic symptoms: shakiness, nervousness, irritability, tachycardia, light-headedness, hunger, tingling of lips/tongue, diaphoresis.

    • Neuroglucopenic symptoms if treatment is delayed: drowsiness, impaired judgment, blurred vision, slurred speech, headaches, progressing to disorientation, seizures, unconsciousness, coma, or death if untreated.

Treatment of Hypoglycemia

  • Conscious patient: quick-acting carbohydrate (e.g., orange or apple juice, skim milk, sugar, honey, life savers/hard candy, glucose tablets or gel).

    • Repeat every 15–20 minutes until blood glucose > 70 mg/dL. normal (70-100)

    • 15 grams of carbs every 15 minutes until there BS is 70 mg/dL. If the patient remains unable to consume food or drink, consider administering intramuscular glucagon or intravenous dextrose.

    • simple carbs orange juice, candy, or glucose tablets are effective options.

    • do not give them fat or protien as these macronutrients can slow the absorption of glucose and delay the recovery from hypoglycemia.

    • once you get it up give a complex carbs to keep the bs from dropping like peanut butter or whole grain bread, which provide sustained energy and help stabilize blood sugar levels.

  • Unconscious patient: injectable glucagon should be administered; people on insulin should always have this on hand.(Stored glucose)

  • D50 is a concentrated dextrose solution used for immediate treatment of severe hypoglycemia and should be administered intravenously when a patient is unable to ingest glucose orally.

  • what do you follow it up with? After administering D50, it is important to monitor the patient's blood glucose levels closely to ensure they remain stable and to provide additional carbohydrates if necessary.

Diabetic Ketoacidosis (DKA)

  • Life-threatening emergency due to inadequate or absent insulin.

  • Early signs: headache, anorexia, fatigue; progressive: polyuria, polydipsia, polyphagia; dehydration, weakness, lethargy, abdominal pain, N/V, fruity breath, tachycardia, tachypnea, blurred vision, hypothermia.

  • Late signs: air hunger // deep and fast (Kussmaul respirations), coma, shock; death can result if untreated.

  • Treatment goals focus on correcting three problems:

    • Dehydration: initiate normal saline (NS) bolus, followed by maintenance infusion.

    • Electrolyte imbalance: high initial potassium (K+) may become depleted with hydration and insulin; insulin helps K+ move back into cells; may require K+ infusion if hypokalemia develops.

    • Acidosis: insulin drip/boluses until subcutaneous insulin can be given.

    • Fat is brokendown and the biproduct is ketones, which can lead to ketoacidosis if not managed appropriately.

    • ph will be lower than 7.35 and hco3 will be low and co2 will be decreased as the body attempts to compensate for the metabolic acidosis through respiratory mechanisms. will make the PH normal , bringing it back to the normal range of 7.35-7.45, while also addressing the underlying cause of the acidosis.

    • Diabetic Ketoacidosis

      • Seen mostly in type 1

        • Blood sigar >250

    • Hyperglycemic hypermolar state:

      • Seen in Type 2

      • Blood Sugar >600

      • Will not have acidosis or ketones in the blood, as it primarily results from severe dehydration and insulin deficiency rather than ketoacidosis.

    • Osmolality: Often increased, reflecting high glucose concentration in the blood, which leads to increased plasma osmolality.

Medical Diagnosis of Diabetes

  • Diagnosis on two occasions with one or more criteria:

    • Symptoms plus random glucose ≥ 200 extmg/dL200 \, ext{mg/dL}

    • Fasting (8 h) glucose ≥ 126 extmg/dL126 \, ext{mg/dL}

    • 2-hour postprandial glucose ≥ 200 extmg/dL200 \, ext{mg/dL} during an oral glucose tolerance test (OGTT)

  • Prediabetes:

    • Fasting glucose 100−125 extmg/dL100-125 \, ext{mg/dL}

    • 2-hour glucose during OGTT 140−199 extmg/dL140-199 \, ext{mg/dL}

  • Education on weight reduction and exercise is recommended for those at risk.

  • Glycosalated Hemoglobin = Hgb A1C

Medical Treatment

Nutritional Management

  • Very important and complex; all patients should have a registered dietitian on the care team.

  • Goals on page 1056 (per course material).

  • Weight management strategy: calories per kg of body weight; carbohydrate counting useful for intensive insulin therapy or pump users.

  • Emphasis on a well-balanced diet aligned with protein, fat, and carbohydrate distribution.

  • Normal A1C < 5.7

  • Pre A1C is 5.7-6.4

  • DM > 6.4

Exercise

  • Aids in weight loss, improves cardiovascular conditioning, enhances insulin sensitivity, and improves well-being.

  • Exercising muscle uses glucose at about 2020 times the rate of resting muscle.

  • Recommendation: about 150minutesperweek150{ minutes per week} of exercise.

  • Exercise can cause Type 1 DM to become hyperglycemic/ DKA or cause Type 2 DM to become hypoglycemic; monitor glucose before, after, and sometimes during exercise; plan consistent exercise times when possible.

Insulin Therapy

  • Required for all Type 1 and some Type 2 patients.

  • Classes of insulin by action: rapid-acting, short-acting, intermediate-acting, long-acting.

  • Type 1 diabetes will most likely not be on oral medications , as the body is unable to produce insulin at all, necessitating lifelong insulin therapy for blood glucose regulation. In contrast, some Type 2 diabetes patients may manage their condition with oral medications, but insulin therapy may be required if these medications become insufficient to control blood sugar levels.

  • Examples:

    • Rapid-acting: Humalog, NovoLog

    • Short-acting: Regular insulin (Humulin R, Novolin R, ReliOn R)

    • Intermediate-acting: NPH (Humulin N, Novolin N, ReliOn N)

    • Long-acting: Glargine (Lantus) 24 hours , Detemir (Levemir) 48 hours // steady stabalizing blood glucose

    • Doctor order bedtime dose: regular insulin of 10 units and NPH 8 units and orders lantus 12 units to ensure optimal overnight glucose control and prevent hypoglycemic episodes during the night.

  • Route: not given orally; administered subcutaneously and sometimes IV infusion.

  • Concentrations in the US: typically 100units/mL100 \text{units/mL} and 500units/mL500 \text{units/mL}.

  • Premixed insulin kits reduce errors vs. drawing two types in the same syringe; refer to pg 1059 for specific preparations.

Insulin Therapy: Dosing and Delivery

  • Typical dosing schedule: rapid/short-acting before meals; long- or intermediate-acting insulin at other times to keep glucose levels even between meals.

  • Insulin pumps: catheter in abdomen with a pump delivering rapid-acting or Regular insulin at a basal rate; user can program boluses before meals or for hypoglycemia as needed.

Insulin Mixing and Injections

  • Mixing principle: “clear to cloudy”

    • Short-acting insulin is clear; longer-acting insulin is cloudy.

    • Draw up short-acting first.

    • When mixing, inject air into both vials first starting with long-acting vial, then short-acting vial, withdraw prescribed amount from short-acting vial, then inject into long-acting vial to withdraw its amount.

  • Injection sites: abdomen, thigh, or outer arm/tricep area.

Oral Hypoglycemic Agents

  • For Type 2 DM patients not controlled by diet/exercise alone.

  • Classes include sulfonylureas, alpha-glucosidase inhibitors, biguanides, thiazolidinediones, meglitinides, DPP-4 inhibitors, etc.; see pg 1062 for specifics.

  • If serum glucose rises above 300 extmg/dL300 \, ext{mg/dL}, temporary insulin injections may be given.

Glucose Self-Monitoring

  • Reduces long-term complications by helping maintain normal glucose levels.

  • Frequency depends on treatment plan; more frequent monitoring for those on pumps or injections.

  • Ketone testing is recommended during illness to detect impending DKA. check there ketones in the urine to assess if there is a need for immediate medical intervention and to guide adjustments in insulin dosages.

  • Targets for nonpregnant adults: fasting goal 70−130 extmg/dL70-130 \, ext{mg/dL}; postprandial goal <180 \, ext{mg/dL}. Regular follow-ups with healthcare providers are essential to adjust treatment plans and ensure optimal management of diabetes.

Glycosylated Hemoglobin (HbA1c)

  • HbA1c level checks glycemic control over the previous ~3 months.

  • Reported as a percentage reflecting glucose exposure of RBCs during their ~120-day lifespan.

  • In this course material, HbA1c is noted as being done every 2−3extmonths2-3 ext{ months} to assess control.

Complications of Therapy

Hypoglycemia (therapy-related)

  • Can arise from excessive insulin/oral hypoglycemic agents, inadequate food intake, missed meals, or inconsistent/excessive exercise.

  • Immediate management depends on consciousness and blood glucose status; patient education on eating after insulin or preplanned carb intake is essential.

Somogyi Phenomenon (Rebound Hyperglycemia)

  • Rebound high glucose levels following hypoglycemia; suspect if patient reports morning headaches, restless sleep, nightmares, enuresis, N/V.

  • how to fix it involves adjusting the insulin dosages or implementing a bedtime snack with carbohydrates to prevent nocturnal hypoglycemia. Regular monitoring of blood glucose levels also aids in identifying patterns that may require dietary adjustments.

Dawn Phenomenon

  • Early morning rise in fasting glucose (between ~5 and ~9 am) due to GH and cortisol release.

  • May be managed with a bedtime snack and delaying evening insulin by 1 hour (e.g., until 10 pm). Check blood sugar at 3 am

Nursing Care of Patients with Diabetes Mellitus

Assessment

  • If the patient is unconscious, determine:

    • Type of diabetes

    • Hypoglycemic agents used

    • Recent food and fluid intake

    • Laboratory values

  • After acute stabilization, complete health history and physical examination (typically RN duties).

  • Key areas: chief complaint, history of present illness, past medical history, family history, ROS.

Physical Exam Focus

  • General survey: LOC, posture, gait, overall well-being; vital signs; height/weight.

  • Visual acuity (Snellen chart) because of cataracts and glaucoma

  • Fruity breath may indicate ketoacidosis , which requires immediate evaluation and management.

  • Feet: inspect for blisters, lesions, discoloration, deformities, edema, ingrown nails.

  • Ankles: edema and peripheral pulses to assess circulation.

  • Neurologic status: assess sensory/motor findings.

Nursing Diagnoses and Interventions

  • Possible diagnoses include:

    • Ineffective health maintenance (diet, metabolism, N/V)

    • Ineffective therapeutic regimen management (financial, personal, family disruptions)

    • Risk for deficient fluid volume (hyperglycemia, altered urine output)

    • Chronic pain (neuropathy)

    • Disturbed sensory perception / impaired skin integrity

Hypoglycemia: Detailed Considerations

Definition and Causes

  • Hypoglycemia may occur from factors beyond diabetes treatment.

  • Defined as a syndrome where blood glucose falls to less than 45−50 extmg/dL45-50 \, ext{mg/dL}.

  • Causes:

    • Exogenous: external factors causing low glucose levels.

    • Endogenous: internal factors causing excessive insulin or increased glucose metabolism.

    • Functional: e.g., gastric surgery, fasting, malnutrition, etc.

Signs and Symptoms

  • Symptom onset varies with rate of glucose decline:

    • Rapid decline: weakness, hunger, diaphoresis, tremors, anxiety, irritability, headache, pallor, tachycardia.

    • Slow decline (over hours): confusion, weakness, dizziness, blurred/double vision, seizures, coma (in severe cases).

Diagnosis

  • Can be supported by fasting glucose, OGTT, IV glucose tolerance test, or prolonged inpatient fasting.

  • Whipple’s Triad:

    • Presence of symptoms consistent with hypoglycemia

    • Documentation of low blood glucose when symptoms occur

    • Improvement of symptoms when blood glucose rises

Medical Treatment

  • Dictated by cause and patient condition:

    • Unconscious patient: administer 50 mL of D50 IV immediately.

    • Conscious patient with mild hypoglycemia: give 15 g of carbohydrate and reassess after ~10 minutes; repeat if needed.

  • Education on preventing hypoglycemia through appropriate food intake and carb counting when applicable.

Nursing Care and Interventions

  • Comprehensive assessment including history, current symptoms, past medical history, hypoglycemic agents and last dose, diet/alcohol intake, and daily activities.

  • Monitor vitals, glucose trends, and symptoms.

  • Intervene for deficient knowledge about hypoglycemia management and risk for injury from dizziness or weakness.

Notes on Formulas and Key Numbers (for quick reference)

  • Diabetes diagnostic thresholds:

    • Symptoms + random glucose ≥ 200 extmg/dL200 \, ext{mg/dL}

    • Fasting glucose ≥ 126 extmg/dL126 \, ext{mg/dL}

    • 2-hour postprandial glucose ≥ 200 extmg/dL200 \, ext{mg/dL} during OGTT

  • Prediabetes thresholds:

    • Fasting glucose 100−125 extmg/dL100-125 \, ext{mg/dL}

    • 2-hour OGTT glucose 140−199 extmg/dL140-199 \, ext{mg/dL}

  • Glycemic targets:

    • Fasting: 70−130 extmg/dL70-130 \, ext{mg/dL}

    • Postprandial: <180 \, ext{mg/dL}

  • HbA1c: reflects ~3 months of glucose control; tested periodically (per course, every 2-3 months in some settings).

  • Exercise prescription: extabout150extminutes/weekext{about }150 ext{ minutes/week}

  • Insulin administration basics: concentrations 100 extunits/mL100\, ext{units/mL} and 500 extunits/mL500\, ext{units/mL}; premixed insulins reduce errors; insulin should be mixed by the rule "clear to cloudy" (short/rapid acting before intermediate/long-acting).

Connections to Foundations and Real-World Relevance

  • DM pathophysiology ties directly to principles of endocrinology, metabolism, and cellular signaling (insulin receptor signaling, GLUT-4 translocation).

  • Long-term complications emphasize microvascular and macrovascular pathologies, illustrating the systemic impact of chronic hyperglycemia.

  • Management integrates nutrition, physical activity, pharmacology (insulin and oral agents), and patient education, highlighting multidisciplinary care roles (dietitians, nurses, physicians).

  • Acute emergencies (hypoglycemia, DKA) stress rapid assessment and intervention to prevent morbidity and mortality.

This set of notes captures the major and minor points from the transcript, including definitions, pathophysiology, diagnostic criteria, management strategies, and nursing considerations. It should serve as a comprehensive study-aid for exam preparation.