[05.08b] CMD - Adult Hypoglycemic Disorders V2.pdf

Low plasma glucose concentration sufficient to cause symptoms and/or signs, including impaired brain functioning

What is the clinical definition of hypoglycemia?

Whipple's Triad

What classic triad is required to confirm the diagnosis of hypoglycemia?

Signs or symptoms consistent with hypoglycemia

What is the first component of Whipple's Triad?

Documented low plasma glucose concentration

What is the second component of Whipple's Triad?

Resolution of signs and symptoms after plasma glucose is raised

What is the third component of Whipple's Triad?

Neurogenic (or Autonomic) symptoms

Which category of hypoglycemic symptoms arises from sympatho-adrenal discharge triggered by falling glucose?

Neuroglycopenic symptoms

Which category of hypoglycemic symptoms arises directly from glucose deprivation in the brain?

Palpitations

Which autonomic symptom presents as a rapid, pounding heartbeat during hypoglycemia?

Tremor

Which autonomic symptom presents as involuntary shaking during hypoglycemia?

Anxiety / arousal

Which autonomic feeling of nervous tension is triggered by sympatho-adrenal release?

Cold sweating

Which autonomic skin manifestation results from sympathetic stimulation during hypoglycemia?

Hunger

Which early autonomic symptom promotes behavioral food-seeking during falling glucose?

Paresthesias

Which autonomic sensory symptom presents as tingling sensations during hypoglycemia?

Weakness

Which early neuroglycopenic symptom presents as generalized muscle fatigue during hypoglycemia?

Drowsiness

Which neuroglycopenic symptom presents as excessive sleepiness or lethargy during hypoglycemia?

Impaired cognition (difficulty concentrating, confusion)

Which neuroglycopenic cognitive symptom impairs problem-solving and mental clarity?

Incoordination

Which neuroglycopenic motor symptom manifests as clumsy, uncoordinated movements?

Behavioral changes

Which neuroglycopenic psychiatric symptom manifests as irritability, mood shifts, or altered personality?

Sympathetic nervous system and Adrenal medulla

Which two major anatomical components comprise the sympatho-adrenal response during hypoglycemia?

70 to 99 mg/dL

What is the normal blood glucose reference range stated by Dr. Nicodemus?

Subtle neurological signs and hunger

What initial symptoms manifest as blood glucose drops just below the normal range?

Glucagon, Epinephrine, and Cortisol

The release of which three hormones causes initial sweating and trembling as glucose drops?

Sweating and trembling

Which two outward physical signs occur following glucagon, epinephrine, and cortisol release?

Lethargy

What specific neurological symptom develops when blood glucose falls below 40 mg/dL?

30 mg/dL

At approximately what blood glucose concentration cutoff do convulsions and potential coma occur?

Convulsions and coma

What life-threatening neurological events occur around a blood glucose level of 30 mg/dL?

Permanent brain damage or death

What catastrophic outcome results from prolonged, uncorrected severe hypoglycemia?

Weakness, drowsiness, and impaired cognition

What three basic cerebral symptoms are listed as immediate effects of brain hypoglycemia?

Neurocognitive dysfunction

What high-level cognitive impairment is caused by repeated brain glucose deprivation?

High risk of dementia

Chronic or severe hypoglycemia increases the long-term risk of developing which neurodegenerative condition?

Increased frequency of seizures

How does severe hypoglycemia impact seizure activity in susceptible individuals?

Functional brain failure

What temporary cessation of higher cortical function occurs during acute severe hypoglycemia?

Brain injury

What structural damage can result from severe, prolonged neuroglycopenia?

Prolonged cerebellar ataxia

Which specific cerebellar motor impairment can persist following severe hypoglycemic episodes?

Diplopia (double vision)

Which ocular symptom impairs binocular vision during hypoglycemia?

Higher risk of loss of vision

What severe long-term ocular complication is associated with recurrent hypoglycemia?

Reduction of retinal sensitivity

How does hypoglycemia affect the light-sensitivity threshold of the retina?

Reduction of retinal response

How does hypoglycemia impact electroretinographic signals in the eye?

Decreased retinal viability

What cell-survival change occurs in retinal tissue during severe glucose deprivation?

Sympathoadrenal response

Which neuroendocrine pathway drives cardiovascular hemodynamic changes during hypoglycemia?

Increased heart oxygen consumption, increased contractility, increased adrenaline, increased heart workload

What four major hemodynamic changes occur in the heart during hypoglycemia?

Myocardial infarction (MI)

Hemodynamic strain and increased cardiac workload during severe hypoglycemia predispose patients to what acute ischemic event?

Electrocardiographic (ECG) changes

What diagnostic electrical abnormalities are recorded in the heart during severe hypoglycemia?

QTc interval prolongation

Which specific ECG interval change predisposes hypoglycemic patients to fatal ventricular arrhythmias?

Flattening of T wave

What repolarization abnormality on ECG is commonly observed during severe hypoglycemia?

ST-segment depression

Which ECG finding serves as a sign of acute myocardial ischemia during severe hypoglycemia?

Heart rate variability, ectopic activity, ventricular tachycardia, atrial fibrillation

What specific cardiac rhythm abnormalities (arrhythmias) can be triggered by severe hypoglycemia?

Increased C-Reactive Protein (CRP)

Which hepatic acute-phase reactant increases during hypoglycemia-induced systemic inflammation?

Increased Interleukin-6 (IL-6)

Which pro-inflammatory cytokine is elevated during severe hypoglycemic stress?

Increased Vascular Endothelial Growth Factor (VEGF)

Which angiogenic cytokine increases during hypoglycemia, impacting vascular health?

Decreased vasodilation

How does endothelial dysfunction manifest in peripheral blood vessels during hypoglycemia?

Pro-coagulant / pro-thrombotic state

What overall blood coagulation shift occurs during severe hypoglycemia?

Increased Factor VII

Which specific coagulation factor is elevated during severe hypoglycemia?

Increased neutrophil activation

Which white blood cell inflammatory response is heightened during hypoglycemia?

Increased platelet activation

Which cellular component of hemostasis becomes hyperactive during severe hypoglycemia?

Severe chronic or recurrent hypoglycemia

In what clinical setting do long-term inflammatory, endothelial, and thrombotic risks accumulate?

55 mg/dL (3.0 mmol/L)

At what specific plasma glucose threshold is autonomic defense and food-seeking behavior activated?

Prompt behavioral defense of food ingestion (seeking food and eating)

What primary behavioral action is triggered when blood glucose reaches 55 mg/dL or below?

Complete suppression of endogenous insulin secretion

What happens to pancreatic beta-cell insulin output when blood glucose reaches 55 mg/dL or below?

Less than 3 uU/mL (18 pmol/L)

To what level does plasma insulin drop when blood glucose falls to 55 mg/dL or below?

Less than 0.6 ng/mL (0.2 nmol/L)

To what level does C-peptide drop when blood glucose falls to 55 mg/dL or below?

Less than 5.0 pmol/L

To what level does proinsulin drop when blood glucose falls to 55 mg/dL or below?

C-peptide

Which cleavage peptide removed from pre-proinsulin is produced in equimolar amounts with mature insulin?

80 to 85 mg/dL (4.4 - 4.7 mmol/L)

What is the glycemic threshold for the initial reduction in endogenous insulin secretion?

Reduction of insulin secretion

What is the body's primary regulatory factor and first line of defense against hypoglycemia?

65 to 70 mg/dL (3.6 - 3.9 mmol/L)

What is the glycemic threshold for increased secretion of glucagon and epinephrine?

Increased glucagon secretion

What is the primary counter-regulatory hormone and second line of defense against hypoglycemia?

Increased epinephrine secretion

What is the third line of defense against hypoglycemia, critical when glucagon is deficient?

Cortisol and Growth Hormone (GH)

Which two hormones act as defense mechanisms during prolonged hypoglycemia?

50 to 55 mg/dL (2.8 - 3.1 mmol/L)

At what glycemic threshold do overt autonomic/neurogenic symptoms typically appear?

Less than 50 mg/dL (< 2.8 mmol/L)

At what glycemic threshold is cognitive function compromised, impairing self-treatment?

Stimulates liver glycogenolysis and renal/hepatic gluconeogenesis

How does elevated glucagon work physiologically to raise blood glucose levels?

Increases sympathoadrenal outflow, stimulating pituitary GH and ACTH secretion

How does the central nervous system respond to decreasing glucose to activate adrenal defenses?

Adrenal cortex secretes cortisol; Adrenal medulla secretes epinephrine and norepinephrine

Which adrenal zones and hormones are activated by ACTH and sympathetic outflow during hypoglycemia?

Patients with diabetes (especially those taking insulin or secretagogues)

Which patient population most commonly experiences clinical hypoglycemia in practice?

Excessive, ill-timed, or wrong type of insulin or secretagogue doses

How do diabetes medications contribute to hypoglycemia risk?

Missed meals, reduced carbohydrate intake, or overnight fasting for procedures

What clinical scenarios cause decreased exogenous glucose delivery?

Acute alcohol ingestion

What ingested substance inhibits endogenous hepatic glucose production, leading to hypoglycemia?

Liver

Which organ is the primary site of endogenous glucose production that is impaired by alcohol?

During and shortly after exercise (or late night after exercise)

When is peripheral glucose utilization increased, predisposing to hypoglycemia?

Middle of the night / late after exercise, after weight loss, or after improved fitness

In what clinical situations can increased insulin sensitivity lead to delayed hypoglycemia?

Renal failure, hepatic failure, hypothyroidism, high insulin-binding antibodies

Which pathological states decrease insulin clearance, making insulin persist longer in circulation?

Level 1 Hypoglycemia

What ADA classification corresponds to glucose < 70 mg/dL (3.9 mmol/L) and >= 54 mg/dL (3.0 mmol/L)?

Level 2 Hypoglycemia

What ADA classification corresponds to glucose < 54 mg/dL (< 3.0 mmol/L)?

Level 3 Hypoglycemia

What ADA classification describes a severe event with altered mental/physical status requiring assistance regardless of glucose level?

Level 3 Hypoglycemia

If a diabetic patient has a glucose of 62 mg/dL but is found confused and unable to self-treat, how is the episode classified?

Recent (within past 3-6 months) Level 2 or Level 3 hypoglycemia

Which major clinical risk factor strongly predicts future recurrent hypoglycemic episodes?

Intensive insulin therapy

Which insulin treatment strategy using high doses or basal-bolus regimens increases hypoglycemia risk?

Impaired hypoglycemia awareness

What condition describes patients who have documented low glucose but fail to experience warning symptoms?

End-stage kidney disease (ESKD)

Which renal condition prolongs circulating insulin half-life due to decreased renal insulin clearance?

Cognitive impairment or dementia

Which neurocognitive condition prevents patients from recognizing symptoms or seeking help?

Food insecurity

Which major socioeconomic risk factor involves uncertain access to adequate nutrition?

Low-income status

Which economic status is directly linked to food insecurity and hypoglycemia risk?

Housing insecurity

Which social factor involving unstable living conditions increases hypoglycemia risk?

Fasting for religious or cultural reasons

Which cultural/religious practice involves extended periods without food, raising hypoglycemia risk?

Underinsurance

Which health system factor limits access to medications, testing strips, or clinical care?

Multiple recent Level 1 hypoglycemia episodes

Which minor clinical risk factor reflects frequent borderline low blood sugars?

Basal insulin therapy

Which standard insulin regimen carries a baseline risk for hypoglycemia?

Age >= 75 years

Which age threshold is listed as a biological risk factor due to frailty or delayed meal access?

Female sex

Which demographic factor is listed as a biological risk factor for hypoglycemia in treated diabetes?