Application Question - GI
An older adult develops megaloblastic anemia and peripheral neuropathy after long‑standing atrophic gastritis, due to loss of a stomach‑derived factor required for vitamin B12 absorption.
What is intrinsic factor?
An 82‑year‑old has a “normal” serum creatinine but is at increased risk for drug toxicity because aging reduces this key measure of kidney function despite stable creatinine levels.
What is glomerular filtration rate (GFR)?
An older adult with reduced appetite, early satiety, and delayed post‑meal hunger experiences these changes primarily due to age‑related declines in gastric motility rather than disease.
What is delayed gastric emptying associated with normal aging?
An otherwise healthy 80‑year‑old has a reduced FEV₁ but a preserved FEV₁/FVC ratio due to age‑related loss of elastic recoil rather than airflow obstruction.
What is normal age‑related change in lung mechanics
In older adults, dehydration increases risk for both acute kidney injury and delirium because reduced thirst response and impaired renal concentrating ability limit this homeostatic process.
What is fluid balance regulation?
A patient experiences dysphagia to both solids and liquids with progressive esophageal dilation because inhibitory neurons of this plexus have degenerated.
What is the myenteric (Auerbach) plexus, resulting in achalasia?
An older adult becomes hypotensive and oliguric after starting an NSAID while dehydrated because prostaglandin‑mediated dilation of this renal vessel is inhibited.
What is the afferent arteriole?
An older adult taking NSAIDs develops epigastric pain and anemia because these drugs impair this protective mechanism of the gastric mucosa, which is already reduced with aging.
What is prostaglandin‑mediated gastric mucosal protection?
Older adults are at increased risk for pneumonia because aging impairs this airway defense mechanism responsible for clearing mucus and pathogens.
What is mucociliary clearance?
Older adults are more prone to dehydration and acute kidney injury because aging reduces thirst sensation and the kidney’s ability to perform this function.
What is urine concentration and water conservation?
Chronic NSAID use predisposes older adults to gastric ulcers because inhibition of cyclooxygenase reduces this protective mechanism in the stomach lining.
What is prostaglandin‑mediated gastric mucosal protection?
An elderly patient with vomiting and poor oral intake develops confusion and falls due to this common sodium disturbance caused by impaired renal water handling.
What is hyponatremia?
An older adult with chronic malabsorption develops osteoporosis because impaired absorption of calcium and vitamin D occurs at this level of the gastrointestinal tract.
What is the small intestine, specifically the duodenum and jejunum?
An older adult with chronic bronchitis develops persistent hypoxemia primarily due to uneven ventilation of perfused alveoli rather than diffusion failure.
What is ventilation–perfusion (V/Q) mismatch?
Chronic hypoxia from long‑standing lung disease causes pulmonary hypertension and eventually damages the kidneys by reducing effective renal perfusion through this systemic mechanism.
What is chronic right‑sided heart failure with decreased renal blood flow?
Chronic malabsorption leading to osteoporosis occurs in this condition due to villous atrophy that decreases calcium and vitamin D absorption.
What is celiac disease?
An older adult with heart failure develops rising creatinine after aggressive diuresis due to decreased renal perfusion, representing this type of acute kidney injury.
What is prerenal acute kidney injury?
Older adults are at increased risk for aspiration pneumonia because age‑related changes impair this coordinated gastrointestinal process even in the absence of obvious dysphagia.
What is swallowing and esophageal clearance?
An elderly patient presents with acute confusion and falls instead of cough or fever as the first sign of pneumonia due to this age‑related physiologic change.
What is atypical presentation of pulmonary infection in older adults?
An older adult develops AKI and gastric ulceration after NSAID use because inhibition of prostaglandins disrupts protection in both of these organ systems.
What are the kidney (afferent arteriole) and gastric mucosa?
Increased risk of aspiration pneumonia in older adults is explained by age‑related reductions in this coordinated process involving oral, pharyngeal, and esophageal phases.
What is effective swallowing and esophageal clearance?
In older adults with diabetes and hypertension, this maladaptive renal process initially preserves function but ultimately accelerates nephron loss and CKD progression.
What is glomerular hyperfiltration?
Constipation in older adults is not a normal aging change but instead reflects immobility, medication use, and dysfunction of this intrinsic gastrointestinal regulatory system.
What is the enteric nervous system?
Long‑standing COPD in older adults leads to right‑sided heart failure because chronic hypoxia causes this persistent pulmonary vascular response.
What is hypoxic pulmonary vasoconstriction progressing to pulmonary hypertension and cor pulmonale?
Loss of muscle mass with aging contributes to inaccurate assessment of renal function, impaired mobility, increased fall risk, and worse outcomes because this physiologic marker becomes unreliable.
What is serum creatinine as an inaccurate indicator of GFR due to sarcopenia?