Endocrine

Illness raises counter-regulatory hormones and therefore insulin requirements, so omitting insulin during illness precipitates diabetic ketoacidosis.

Diabetic foot disease results from the combination of peripheral neuropathy, which removes protective sensation, peripheral arterial disease, which impairs healing, and immune impairment, which raises infection risk. A minor injury that would be trivial in another client can progress to ulceration, osteomyelitis and amputation. Teaching is preventive and specific: inspect the feet daily including the soles and between the toes, using a mirror or another person; wash daily in lukewarm water, tested with the elbow or a thermometer since the feet cannot judge temperature reliably; dry carefully, especially between the toes; apply lotion to the tops and bottoms but not between the toes; cut nails straight across without rounding the corners, or have them cut professionally where vision or reach is limited; never walk barefoot; inspect footwear before wearing it; choose well-fitting closed shoes and seamless socks, changed daily; avoid heating pads, hot water bottles and soaking; and avoid self-treating corns, calluses or ingrown nails. Any break in the skin, redness, swelling, drainage or change in color or temperature is reported promptly rather than watched.

Diabetic microvascular disease produces sensory and autonomic neuropathy, nephropathy and retinopathy, each with distinct assessment findings.

Hypoglycemia in a client on insulin or a sulfonylurea presents with autonomic features first, including sweating, tremor, palpitations, hunger and anxiety, followed by neuroglycopenic features as brain glucose falls: confusion, slurred speech, incoordination, behavior change, then seizure and coma. Clients with long-standing diabetes or taking beta-blockers may lose the autonomic warning and present with neuroglycopenic symptoms directly, which is hypoglycemia unawareness. Treatment for a conscious client able to swallow is roughly 15 grams of rapidly absorbed carbohydrate such as glucose tablets, juice, regular soda or honey, with a recheck after 15 minutes and repetition until glucose is above target, followed by a snack containing protein and complex carbohydrate if the next meal is not imminent. For a client who cannot swallow safely, glucagon is given intramuscularly or subcutaneously, or intravenous dextrose where access exists. Nothing is given by mouth to an unresponsive client because of the aspiration risk. Afterwards the cause is sought: a missed meal, unusual exercise, a dosing error, or alcohol.

Oral antidiabetic agents act on endogenous insulin secretion or tissue sensitivity, so they differ in hypoglycemia risk and are ineffective in type 1 diabetes.

Type 2 diabetes develops when insulin resistance outpaces the pancreas's ability to compensate, so risk factors are those that either increase resistance or reveal limited reserve. The standard screening set covers overweight or obesity, physical inactivity, a first-degree relative with the disease, higher-risk racial and ethnic background, a history of gestational diabetes or of delivering a large infant, polycystic ovary syndrome, hypertension, dyslipidemia, and previously identified prediabetes. Gestational diabetes deserves particular emphasis, because pregnancy imposes a physiological insulin-resistant state and a client who could not compensate then has demonstrated the limit directly — a substantial proportion go on to develop type 2 diabetes, which is why postpartum glucose testing and ongoing follow-up are recommended rather than optional. Type 1 diabetes is a separate disease: autoimmune destruction of pancreatic beta cells, usually presenting earlier, with a different inheritance pattern and no shared risk with type 2. Several endocrine conditions, including hyperthyroidism and Cushing syndrome, produce glucose intolerance through their own mechanisms and are worth knowing as secondary causes rather than as items on the routine screening list.

A correctly formed delegation names the client, the task, the timing and the exact values that trigger a report. Vague terms — 'low', 'high', 'off' — hand the definition of abnormal to the person least equipped to set it, and words like 'treat', 'adjust' or 'decide' hand over the intervention. Capillary glucose measurement is delegable in most facilities; interpreting the result, treating hypoglycemia and altering intake are not. The assistant measures and reports; the nurse decides and acts.

Long-term corticosteroid therapy suppresses endogenous cortisol production, so abrupt withdrawal precipitates a life-threatening crisis.

Exogenous corticosteroids given for more than a few weeks suppress the hypothalamic-pituitary-adrenal axis through negative feedback, and the adrenal cortex atrophies. Recovery after withdrawal takes weeks to months, during which the client cannot mount a stress response. Adrenal crisis is the acute failure of that response, and it is precipitated by abrupt cessation, by illness, surgery or injury, and by vomiting that prevents an oral dose being absorbed. It presents with hypotension progressing to shock, profound weakness, nausea and vomiting, abdominal pain, fever, hypoglycemia, hyponatremia and hyperkalemia. Management is intravenous hydrocortisone, isotonic fluid with dextrose, and treatment of the precipitant. The corresponding teaching is what prevents it: never stop the drug abruptly, taper only under supervision, increase the dose during illness or before surgery as directed, carry identification stating steroid dependence, and contact the provider when vomiting prevents a dose being taken.

The adrenal glands sit atop the kidneys, and cortical failure produces combined glucocorticoid and mineralocorticoid deficiency.

Long-term corticosteroid therapy suppresses the hypothalamic-pituitary-adrenal axis through negative feedback, causing adrenal atrophy and loss of the ability to mount a stress response; recovery after withdrawal takes weeks to months. Teaching therefore centers on never stopping abruptly, tapering only as directed, increasing the dose during illness, injury or surgery as instructed, carrying identification, and contacting the provider when vomiting prevents an oral dose being taken. Adverse effects are numerous and dose- and duration-related: hyperglycemia, weight gain with central fat redistribution, hypertension and fluid retention, osteoporosis, muscle wasting, thinning skin with easy bruising and delayed wound healing, cataract and glaucoma, mood changes and insomnia, peptic ulceration, and immunosuppression with blunted signs of infection. Monitoring includes weight, blood pressure, glucose, and bone density over time, with calcium and vitamin D supplementation commonly recommended. Morning administration with food reduces both sleep disturbance and gastric irritation, and live vaccines are generally avoided while immunosuppressed.

Cushing syndrome results from prolonged glucocorticoid excess, most commonly from exogenous corticosteroid therapy rather than from endogenous disease. Features follow the hormone's actions. Protein catabolism produces thin fragile skin, easy bruising, wide purple striae over the abdomen, breasts and thighs, poor wound healing, and proximal muscle wasting. Altered fat distribution produces central obesity with a rounded plethoric face and an interscapular fat pad, against comparatively thin limbs. Metabolic effects include hyperglycemia and insulin resistance. Mineralocorticoid activity retains sodium and water, producing hypertension, edema and weight gain, while excreting potassium, so hypernatremia with hypokalemia is the expected pattern. Bone effects include osteoporosis and fracture risk, and immune suppression increases infection risk while masking its usual signs, so fever may be absent and a serious infection may present subtly. Mood change, insomnia and psychosis can occur. Where the cause is exogenous, management balances the underlying condition against the dose, with the lowest effective dose used and never stopped abruptly given adrenal suppression.

Subtotal thyroidectomy carries risks defined by the anatomy of the operative field. The recurrent laryngeal nerve runs close to the inferior thyroid artery and supplies the intrinsic laryngeal muscles, so injury produces hoarseness and swallowing difficulty; unilateral injury usually recovers, while bilateral injury threatens the airway. The parathyroid glands sit on the posterior thyroid and may be removed or devascularized, producing hypocalcemia within one to three days — perioral numbness and tingling, then carpopedal spasm, with Chvostek and Trousseau signs positive and laryngospasm in severe cases; calcium gluconate is kept available. Hemorrhage into the closed neck space compresses the trachea, so the nurse checks behind the neck as well as the dressing, watches for a sensation of tightness or fullness, and keeps a tracheostomy set at the bedside. Thyroid storm can be precipitated by manipulation of the gland and presents with high fever, tachycardia, hypertension, agitation and delirium. Positioning is semi-Fowler with the head supported to reduce tension on the suture line.

Long-term corticosteroid therapy suppresses endogenous cortisol production, so abrupt withdrawal precipitates a life-threatening crisis.

Exogenous corticosteroids given for more than a few weeks suppress the hypothalamic-pituitary-adrenal axis through negative feedback, and the adrenal cortex atrophies. Recovery after withdrawal takes weeks to months, during which the client cannot mount a stress response. Adrenal crisis is the acute failure of that response, and it is precipitated by abrupt cessation, by illness, surgery or injury, and by vomiting that prevents an oral dose being absorbed. It presents with hypotension progressing to shock, profound weakness, nausea and vomiting, abdominal pain, fever, hypoglycemia, hyponatremia and hyperkalemia. Management is intravenous hydrocortisone, isotonic fluid with dextrose, and treatment of the precipitant. The corresponding teaching is what prevents it: never stop the drug abruptly, taper only under supervision, increase the dose during illness or before surgery as directed, carry identification stating steroid dependence, and contact the provider when vomiting prevents a dose being taken.

The adrenal glands sit atop the kidneys, and cortical failure produces combined glucocorticoid and mineralocorticoid deficiency.

Long-term corticosteroid therapy suppresses the hypothalamic-pituitary-adrenal axis through negative feedback, causing adrenal atrophy and loss of the ability to mount a stress response; recovery after withdrawal takes weeks to months. Teaching therefore centers on never stopping abruptly, tapering only as directed, increasing the dose during illness, injury or surgery as instructed, carrying identification, and contacting the provider when vomiting prevents an oral dose being taken. Adverse effects are numerous and dose- and duration-related: hyperglycemia, weight gain with central fat redistribution, hypertension and fluid retention, osteoporosis, muscle wasting, thinning skin with easy bruising and delayed wound healing, cataract and glaucoma, mood changes and insomnia, peptic ulceration, and immunosuppression with blunted signs of infection. Monitoring includes weight, blood pressure, glucose, and bone density over time, with calcium and vitamin D supplementation commonly recommended. Morning administration with food reduces both sleep disturbance and gastric irritation, and live vaccines are generally avoided while immunosuppressed.

Cushing syndrome results from prolonged glucocorticoid excess, most commonly from exogenous corticosteroid therapy rather than from endogenous disease. Features follow the hormone's actions. Protein catabolism produces thin fragile skin, easy bruising, wide purple striae over the abdomen, breasts and thighs, poor wound healing, and proximal muscle wasting. Altered fat distribution produces central obesity with a rounded plethoric face and an interscapular fat pad, against comparatively thin limbs. Metabolic effects include hyperglycemia and insulin resistance. Mineralocorticoid activity retains sodium and water, producing hypertension, edema and weight gain, while excreting potassium, so hypernatremia with hypokalemia is the expected pattern. Bone effects include osteoporosis and fracture risk, and immune suppression increases infection risk while masking its usual signs, so fever may be absent and a serious infection may present subtly. Mood change, insomnia and psychosis can occur. Where the cause is exogenous, management balances the underlying condition against the dose, with the lowest effective dose used and never stopped abruptly given adrenal suppression.

Transsphenoidal hypophysectomy removes a pituitary tumor through the nose and sphenoid sinus, usually with an incision beneath the upper lip. Postoperative and discharge care follows the anatomy of that route. Activities raising intracranial pressure are avoided — bending at the waist, straining at stool, heavy lifting, coughing forcefully and blowing the nose — with stool softeners prescribed and sneezing performed with the mouth open. Nasal packing may be in place initially, and the client mouth-breathes. Cerebrospinal fluid leak is the complication to detect: clear drainage from the nose, a persistent postnasal drip described as salty or sweet, or a halo sign on a dressing, all reported immediately because of the meningitis risk, and testing for glucose may support the finding. Tooth brushing is withheld until the sublabial incision has healed, with mouth rinses used instead. Endocrine consequences include transient or permanent diabetes insipidus, so intake, output, urine specific gravity and sodium are monitored, and hormone replacement — corticosteroid, thyroid, and sex hormones or growth hormone as indicated — is frequently required long term with regular endocrine review.

Long-term corticosteroid therapy suppresses the hypothalamic-pituitary-adrenal axis through negative feedback, causing adrenal atrophy and loss of the ability to mount a stress response; recovery after withdrawal takes weeks to months. Teaching therefore centers on never stopping abruptly, tapering only as directed, increasing the dose during illness, injury or surgery as instructed, carrying identification, and contacting the provider when vomiting prevents an oral dose being taken. Adverse effects are numerous and dose- and duration-related: hyperglycemia, weight gain with central fat redistribution, hypertension and fluid retention, osteoporosis, muscle wasting, thinning skin with easy bruising and delayed wound healing, cataract and glaucoma, mood changes and insomnia, peptic ulceration, and immunosuppression with blunted signs of infection. Monitoring includes weight, blood pressure, glucose, and bone density over time, with calcium and vitamin D supplementation commonly recommended. Morning administration with food reduces both sleep disturbance and gastric irritation, and live vaccines are generally avoided while immunosuppressed.

Cushing syndrome results from prolonged glucocorticoid excess, most commonly from exogenous corticosteroid therapy rather than from endogenous disease. Features follow the hormone's actions. Protein catabolism produces thin fragile skin, easy bruising, wide purple striae over the abdomen, breasts and thighs, poor wound healing, and proximal muscle wasting. Altered fat distribution produces central obesity with a rounded plethoric face and an interscapular fat pad, against comparatively thin limbs. Metabolic effects include hyperglycemia and insulin resistance. Mineralocorticoid activity retains sodium and water, producing hypertension, edema and weight gain, while excreting potassium, so hypernatremia with hypokalemia is the expected pattern. Bone effects include osteoporosis and fracture risk, and immune suppression increases infection risk while masking its usual signs, so fever may be absent and a serious infection may present subtly. Mood change, insomnia and psychosis can occur. Where the cause is exogenous, management balances the underlying condition against the dose, with the lowest effective dose used and never stopped abruptly given adrenal suppression.

Diabetic foot disease results from the combination of peripheral neuropathy, which removes protective sensation, peripheral arterial disease, which impairs healing, and immune impairment, which raises infection risk. A minor injury that would be trivial in another client can progress to ulceration, osteomyelitis and amputation. Teaching is preventive and specific: inspect the feet daily including the soles and between the toes, using a mirror or another person; wash daily in lukewarm water, tested with the elbow or a thermometer since the feet cannot judge temperature reliably; dry carefully, especially between the toes; apply lotion to the tops and bottoms but not between the toes; cut nails straight across without rounding the corners, or have them cut professionally where vision or reach is limited; never walk barefoot; inspect footwear before wearing it; choose well-fitting closed shoes and seamless socks, changed daily; avoid heating pads, hot water bottles and soaking; and avoid self-treating corns, calluses or ingrown nails. Any break in the skin, redness, swelling, drainage or change in color or temperature is reported promptly rather than watched.

Diabetic ketoacidosis arises when insulin is effectively absent, so glucose cannot enter cells and fat is metabolized instead, producing ketoacids. Glucose is usually in the range of 300 to 600 mg/dL, arterial pH falls below 7.35, bicarbonate is low, ketones are present in blood and urine, and the client is dehydrated from osmotic diuresis. Kussmaul respirations and acetone breath reflect the acidosis. Hyperosmolar hyperglycemic state occurs when residual insulin is sufficient to prevent ketosis but not hyperglycemia; it develops over days, glucose often exceeds 600 mg/dL, serum osmolality is markedly raised, and neurological changes from profound dehydration dominate, with mortality higher than in ketoacidosis. Treatment of both begins with isotonic fluid, followed by a continuous insulin infusion and careful potassium management — insulin drives potassium intracellularly, so a level that looks normal or high at presentation falls once treatment starts, and insulin is withheld until potassium is above a safe threshold. Glucose is lowered gradually, and dextrose is added once it approaches about 250 mg/dL, both to avoid the osmotic shift that produces cerebral edema.

Type 2 diabetes develops when insulin resistance outpaces the pancreas's ability to compensate, so risk factors are those that either increase resistance or reveal limited reserve. The standard screening set covers overweight or obesity, physical inactivity, a first-degree relative with the disease, higher-risk racial and ethnic background, a history of gestational diabetes or of delivering a large infant, polycystic ovary syndrome, hypertension, dyslipidemia, and previously identified prediabetes. Gestational diabetes deserves particular emphasis, because pregnancy imposes a physiological insulin-resistant state and a client who could not compensate then has demonstrated the limit directly — a substantial proportion go on to develop type 2 diabetes, which is why postpartum glucose testing and ongoing follow-up are recommended rather than optional. Type 1 diabetes is a separate disease: autoimmune destruction of pancreatic beta cells, usually presenting earlier, with a different inheritance pattern and no shared risk with type 2. Several endocrine conditions, including hyperthyroidism and Cushing syndrome, produce glucose intolerance through their own mechanisms and are worth knowing as secondary causes rather than as items on the routine screening list.

Calcium stabilizes nerve membranes, so hypocalcemia increases neuromuscular excitability and threatens the airway through laryngospasm.

Hypothyroidism reduces the metabolic rate across every system, and its findings are the mirror image of hyperthyroidism.

Radioactive iodine is used to treat hyperthyroidism, most commonly Graves disease, and thyroid cancer. Iodine is taken up selectively by thyroid tissue, so the isotope concentrates there and destroys functioning cells over weeks to months. It is contraindicated in pregnancy and during breastfeeding, since it crosses the placenta and concentrates in breast milk and in the infant's thyroid; pregnancy is excluded before treatment and avoided for a defined interval afterwards, commonly six to twelve months depending on indication and dose. Because the isotope is excreted in urine, saliva, sweat and other body fluids, home precautions apply for a period determined by dose: maintaining distance from others where practical, sleeping alone, avoiding close prolonged contact with children and pregnant women, not sharing utensils or towels, flushing the toilet more than once, washing hands thoroughly, and laundering personal items separately. Hypothyroidism is the expected long-term outcome rather than an adverse effect, and thyroid function is monitored with lifelong levothyroxine replacement anticipated. Clients are also told that therapeutic effect takes weeks, so symptoms persist initially and antithyroid medication may continue meanwhile.

Thyroid storm is a life-threatening exacerbation of thyrotoxicosis, usually precipitated by infection, surgery, trauma, diabetic ketoacidosis, childbirth, or abrupt cessation of antithyroid therapy. It presents with hyperthermia often above 40 degrees, tachycardia disproportionate to the fever and frequently with atrial fibrillation, widened pulse pressure, agitation, tremor, delirium progressing to coma, and gastrointestinal symptoms that worsen dehydration. Untreated mortality is high. Management is simultaneous rather than sequential: antithyroid drugs to block hormone synthesis, iodine given afterwards to block release, beta-blockade for the cardiovascular effects, corticosteroids, active cooling with acetaminophen rather than aspirin, since salicylates displace thyroid hormone from binding protein and raise the free level, fluid and electrolyte resuscitation, and treatment of the precipitant. Myxedema coma is the mirror condition at the other end of thyroid function, presenting with hypothermia, bradycardia, hypoventilation, hyponatremia and reduced consciousness, also often precipitated by infection or cold exposure.

Subtotal thyroidectomy carries risks defined by the anatomy of the operative field. The recurrent laryngeal nerve runs close to the inferior thyroid artery and supplies the intrinsic laryngeal muscles, so injury produces hoarseness and swallowing difficulty; unilateral injury usually recovers, while bilateral injury threatens the airway. The parathyroid glands sit on the posterior thyroid and may be removed or devascularized, producing hypocalcemia within one to three days — perioral numbness and tingling, then carpopedal spasm, with Chvostek and Trousseau signs positive and laryngospasm in severe cases; calcium gluconate is kept available. Hemorrhage into the closed neck space compresses the trachea, so the nurse checks behind the neck as well as the dressing, watches for a sensation of tightness or fullness, and keeps a tracheostomy set at the bedside. Thyroid storm can be precipitated by manipulation of the gland and presents with high fever, tachycardia, hypertension, agitation and delirium. Positioning is semi-Fowler with the head supported to reduce tension on the suture line.

The parathyroid glands sit on the posterior thyroid and can be bruised or removed during thyroid surgery, causing acute hypocalcemia. Calcium stabilizes nerve membranes, so a low level makes nerves fire spontaneously: perioral tingling and finger paresthesia come first, then Trousseau's sign (carpal spasm when a blood pressure cuff is inflated) and Chvostek's sign (facial twitching on tapping the facial nerve). The dangerous progression is laryngospasm, tetany and seizure. Postoperative thyroidectomy care therefore includes watching for these signs and keeping calcium available.

Illness raises counter-regulatory hormones and therefore insulin requirements, so omitting insulin during illness precipitates diabetic ketoacidosis.

Acidosis shifts potassium out of cells, so the serum level overstates total body potassium, and insulin therapy reverses the shift rapidly.

Diabetic ketoacidosis arises when insulin is effectively absent, so glucose cannot enter cells and fat is metabolized instead, producing ketoacids. Glucose is usually in the range of 300 to 600 mg/dL, arterial pH falls below 7.35, bicarbonate is low, ketones are present in blood and urine, and the client is dehydrated from osmotic diuresis. Kussmaul respirations and acetone breath reflect the acidosis. Hyperosmolar hyperglycemic state occurs when residual insulin is sufficient to prevent ketosis but not hyperglycemia; it develops over days, glucose often exceeds 600 mg/dL, serum osmolality is markedly raised, and neurological changes from profound dehydration dominate, with mortality higher than in ketoacidosis. Treatment of both begins with isotonic fluid, followed by a continuous insulin infusion and careful potassium management — insulin drives potassium intracellularly, so a level that looks normal or high at presentation falls once treatment starts, and insulin is withheld until potassium is above a safe threshold. Glucose is lowered gradually, and dextrose is added once it approaches about 250 mg/dL, both to avoid the osmotic shift that produces cerebral edema.

The parathyroid glands sit on the posterior thyroid and can be bruised or removed during thyroid surgery, causing acute hypocalcemia. Calcium stabilizes nerve membranes, so a low level makes nerves fire spontaneously: perioral tingling and finger paresthesia come first, then Trousseau's sign (carpal spasm when a blood pressure cuff is inflated) and Chvostek's sign (facial twitching on tapping the facial nerve). The dangerous progression is laryngospasm, tetany and seizure. Postoperative thyroidectomy care therefore includes watching for these signs and keeping calcium available.

Hypoglycemia in a client on insulin or a sulfonylurea presents with autonomic features first, including sweating, tremor, palpitations, hunger and anxiety, followed by neuroglycopenic features as brain glucose falls: confusion, slurred speech, incoordination, behavior change, then seizure and coma. Clients with long-standing diabetes or taking beta-blockers may lose the autonomic warning and present with neuroglycopenic symptoms directly, which is hypoglycemia unawareness. Treatment for a conscious client able to swallow is roughly 15 grams of rapidly absorbed carbohydrate such as glucose tablets, juice, regular soda or honey, with a recheck after 15 minutes and repetition until glucose is above target, followed by a snack containing protein and complex carbohydrate if the next meal is not imminent. For a client who cannot swallow safely, glucagon is given intramuscularly or subcutaneously, or intravenous dextrose where access exists. Nothing is given by mouth to an unresponsive client because of the aspiration risk. Afterwards the cause is sought: a missed meal, unusual exercise, a dosing error, or alcohol.

Oral antidiabetic agents act on endogenous insulin secretion or tissue sensitivity, so they differ in hypoglycemia risk and are ineffective in type 1 diabetes.

A correctly formed delegation names the client, the task, the timing and the exact values that trigger a report. Vague terms — 'low', 'high', 'off' — hand the definition of abnormal to the person least equipped to set it, and words like 'treat', 'adjust' or 'decide' hand over the intervention. Capillary glucose measurement is delegable in most facilities; interpreting the result, treating hypoglycemia and altering intake are not. The assistant measures and reports; the nurse decides and acts.

The parathyroid glands sit on the posterior thyroid and can be bruised or removed during thyroid surgery, causing acute hypocalcemia. Calcium stabilizes nerve membranes, so a low level makes nerves fire spontaneously: perioral tingling and finger paresthesia come first, then Trousseau's sign (carpal spasm when a blood pressure cuff is inflated) and Chvostek's sign (facial twitching on tapping the facial nerve). The dangerous progression is laryngospasm, tetany and seizure. Postoperative thyroidectomy care therefore includes watching for these signs and keeping calcium available.

Illness raises counter-regulatory hormones and therefore insulin requirements, so omitting insulin during illness precipitates diabetic ketoacidosis.

Oral antidiabetic agents act on endogenous insulin secretion or tissue sensitivity, so they differ in hypoglycemia risk and are ineffective in type 1 diabetes.

Long-term corticosteroid therapy suppresses endogenous cortisol production, so abrupt withdrawal precipitates a life-threatening crisis.

Acidosis shifts potassium out of cells, so the serum level overstates total body potassium, and insulin therapy reverses the shift rapidly.

Diabetic ketoacidosis arises when insulin is effectively absent, so glucose cannot enter cells and fat is metabolized instead, producing ketoacids. Glucose is usually in the range of 300 to 600 mg/dL, arterial pH falls below 7.35, bicarbonate is low, ketones are present in blood and urine, and the client is dehydrated from osmotic diuresis. Kussmaul respirations and acetone breath reflect the acidosis. Hyperosmolar hyperglycemic state occurs when residual insulin is sufficient to prevent ketosis but not hyperglycemia; it develops over days, glucose often exceeds 600 mg/dL, serum osmolality is markedly raised, and neurological changes from profound dehydration dominate, with mortality higher than in ketoacidosis. Treatment of both begins with isotonic fluid, followed by a continuous insulin infusion and careful potassium management — insulin drives potassium intracellularly, so a level that looks normal or high at presentation falls once treatment starts, and insulin is withheld until potassium is above a safe threshold. Glucose is lowered gradually, and dextrose is added once it approaches about 250 mg/dL, both to avoid the osmotic shift that produces cerebral edema.

Hypoglycemia in a client on insulin or a sulfonylurea presents with autonomic features first, including sweating, tremor, palpitations, hunger and anxiety, followed by neuroglycopenic features as brain glucose falls: confusion, slurred speech, incoordination, behavior change, then seizure and coma. Clients with long-standing diabetes or taking beta-blockers may lose the autonomic warning and present with neuroglycopenic symptoms directly, which is hypoglycemia unawareness. Treatment for a conscious client able to swallow is roughly 15 grams of rapidly absorbed carbohydrate such as glucose tablets, juice, regular soda or honey, with a recheck after 15 minutes and repetition until glucose is above target, followed by a snack containing protein and complex carbohydrate if the next meal is not imminent. For a client who cannot swallow safely, glucagon is given intramuscularly or subcutaneously, or intravenous dextrose where access exists. Nothing is given by mouth to an unresponsive client because of the aspiration risk. Afterwards the cause is sought: a missed meal, unusual exercise, a dosing error, or alcohol.

Transsphenoidal hypophysectomy removes a pituitary tumor through the nose and sphenoid sinus, usually with an incision beneath the upper lip. Postoperative and discharge care follows the anatomy of that route. Activities raising intracranial pressure are avoided — bending at the waist, straining at stool, heavy lifting, coughing forcefully and blowing the nose — with stool softeners prescribed and sneezing performed with the mouth open. Nasal packing may be in place initially, and the client mouth-breathes. Cerebrospinal fluid leak is the complication to detect: clear drainage from the nose, a persistent postnasal drip described as salty or sweet, or a halo sign on a dressing, all reported immediately because of the meningitis risk, and testing for glucose may support the finding. Tooth brushing is withheld until the sublabial incision has healed, with mouth rinses used instead. Endocrine consequences include transient or permanent diabetes insipidus, so intake, output, urine specific gravity and sodium are monitored, and hormone replacement — corticosteroid, thyroid, and sex hormones or growth hormone as indicated — is frequently required long term with regular endocrine review.

Antidiuretic hormone, produced in the hypothalamus and released from the posterior pituitary, causes the renal collecting ducts to reabsorb water. Syndrome of inappropriate antidiuretic hormone secretion involves excess release — commonly from small cell lung cancer, central nervous system disorders, or certain medications — producing water retention, dilutional hyponatremia, low serum osmolality, and concentrated urine with high specific gravity. Symptoms are those of hyponatremia and of fluid overload: headache, nausea, confusion, weight gain without edema, and seizures as sodium falls further. Management is fluid restriction, careful and gradual sodium correction, and treatment of the cause. Diabetes insipidus is the mirror: insufficient hormone, or renal resistance to it, produces large volumes of dilute urine, intense thirst, rising serum sodium and osmolality, and risk of hypovolemia if the client cannot drink enough to keep pace. Management is desmopressin for the central form, adequate fluid replacement, and monitoring of weight, intake and output, and sodium. The name is a historical accident: both conditions were once identified by the volume of urine passed.

Acidosis shifts potassium out of cells, so the serum level overstates total body potassium, and insulin therapy reverses the shift rapidly.

Calcium stabilizes nerve membranes, so hypocalcemia increases neuromuscular excitability and threatens the airway through laryngospasm.

A correctly formed delegation names the client, the task, the timing and the exact values that trigger a report. Vague terms — 'low', 'high', 'off' — hand the definition of abnormal to the person least equipped to set it, and words like 'treat', 'adjust' or 'decide' hand over the intervention. Capillary glucose measurement is delegable in most facilities; interpreting the result, treating hypoglycemia and altering intake are not. The assistant measures and reports; the nurse decides and acts.

Antidiuretic hormone, produced in the hypothalamus and released from the posterior pituitary, causes the renal collecting ducts to reabsorb water. Syndrome of inappropriate antidiuretic hormone secretion involves excess release — commonly from small cell lung cancer, central nervous system disorders, or certain medications — producing water retention, dilutional hyponatremia, low serum osmolality, and concentrated urine with high specific gravity. Symptoms are those of hyponatremia and of fluid overload: headache, nausea, confusion, weight gain without edema, and seizures as sodium falls further. Management is fluid restriction, careful and gradual sodium correction, and treatment of the cause. Diabetes insipidus is the mirror: insufficient hormone, or renal resistance to it, produces large volumes of dilute urine, intense thirst, rising serum sodium and osmolality, and risk of hypovolemia if the client cannot drink enough to keep pace. Management is desmopressin for the central form, adequate fluid replacement, and monitoring of weight, intake and output, and sodium. The name is a historical accident: both conditions were once identified by the volume of urine passed.

Diabetic microvascular disease produces sensory and autonomic neuropathy, nephropathy and retinopathy, each with distinct assessment findings.

Calcium stabilizes nerve membranes, so hypocalcemia increases neuromuscular excitability and threatens the airway through laryngospasm.

The parathyroid glands sit on the posterior thyroid and can be bruised or removed during thyroid surgery, causing acute hypocalcemia. Calcium stabilizes nerve membranes, so a low level makes nerves fire spontaneously: perioral tingling and finger paresthesia come first, then Trousseau's sign (carpal spasm when a blood pressure cuff is inflated) and Chvostek's sign (facial twitching on tapping the facial nerve). The dangerous progression is laryngospasm, tetany and seizure. Postoperative thyroidectomy care therefore includes watching for these signs and keeping calcium available.

Radioactive iodine is used to treat hyperthyroidism, most commonly Graves disease, and thyroid cancer. Iodine is taken up selectively by thyroid tissue, so the isotope concentrates there and destroys functioning cells over weeks to months. It is contraindicated in pregnancy and during breastfeeding, since it crosses the placenta and concentrates in breast milk and in the infant's thyroid; pregnancy is excluded before treatment and avoided for a defined interval afterwards, commonly six to twelve months depending on indication and dose. Because the isotope is excreted in urine, saliva, sweat and other body fluids, home precautions apply for a period determined by dose: maintaining distance from others where practical, sleeping alone, avoiding close prolonged contact with children and pregnant women, not sharing utensils or towels, flushing the toilet more than once, washing hands thoroughly, and laundering personal items separately. Hypothyroidism is the expected long-term outcome rather than an adverse effect, and thyroid function is monitored with lifelong levothyroxine replacement anticipated. Clients are also told that therapeutic effect takes weeks, so symptoms persist initially and antithyroid medication may continue meanwhile.