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Hypokalemia decreases gastrointestinal motility, causing hypoactive bowel sounds and constipation rather than diarrhea. Reduced potassium availability impairs smooth muscle contraction throughout the digestive tract. Diarrhea is more commonly associated with potassium loss as a cause of hypokalemia. Hyperactive bowel sounds are not expected with this electrolyte imbalance.

Peaked T waves are associated with hyperkalemia, not hypokalemia. Low potassium levels typically cause flattened T waves, ST depression, and U waves on electrocardiography. Abdominal cramping may occur with electrolyte disturbances, but it is not the primary finding linked to hypokalemia. The ECG changes make this option incorrect.

Increased deep tendon reflexes and tetany are associated with hypocalcemia and increased neuromuscular excitability. Hypokalemia causes decreased neuromuscular activity, resulting in weakness and fatigue. Tetany is not an expected manifestation of low potassium levels. This finding indicates a different electrolyte imbalance.

Excessive thirst and dry, sticky mucous membranes indicate dehydration and fluid volume deficit rather than hyponatremia. Hyponatremia is usually caused by excess water retention or sodium loss, which may produce fluid overload or neurologic symptoms. These findings are more consistent with hypernatremia.

Bradycardia and peaked T waves are associated with hyperkalemia, not sodium abnormalities. Hyponatremia primarily affects the neurologic system rather than causing specific cardiac conduction changes. Peaked T waves occur due to increased potassium levels affecting myocardial repolarization. This option represents a different electrolyte imbalance.

Hypoactive reflexes and lethargy after antacid use are more consistent with magnesium toxicity, which can occur with excessive magnesium-containing medications. Hyponatremia causes increased neuromuscular irritability and neurologic symptoms rather than depressed reflexes. Antacid use is not a typical cause of sodium imbalance.

Metabolic acidosis occurs when there is excessive acid production or loss of bicarbonate, causing a decreased HCO₃⁻ level. In this client, bicarbonate remains normal at 24 mEq/L, indicating the metabolic system is not the primary cause. The decreased pH is related to elevated PaCO₂.

Metabolic alkalosis occurs when bicarbonate levels increase above the normal range, causing an elevated blood pH. Common causes include vomiting, gastric acid loss, and excessive bicarbonate intake. This client has an acidic pH and normal bicarbonate level, which rules out metabolic alkalosis.

Respiratory alkalosis results from excessive ventilation causing decreased carbon dioxide levels and an increased pH. The PaCO₂ would typically be below 35 mm Hg in this condition. This client has an elevated PaCO₂ of 52 mm Hg, indicating carbon dioxide retention rather than respiratory alkalosis.

Edema causes tissue swelling that can restrict joint movement and decrease range of motion in the affected area. Excess fluid accumulation increases tissue pressure and stiffness. Normal range of motion is not expected when edema significantly affects muscles or joints. This finding does not indicate edema.

Edema results from excess fluid accumulation in body tissues and is often associated with decreased urine output when fluid retention occurs. Increased urine output may reduce edema by removing excess fluid. It is not a typical assessment finding caused by edema itself.

Edema causes an increase in body weight because of retained fluid within the interstitial spaces. A significant decrease in weight would suggest fluid loss or dehydration rather than fluid accumulation. Monitoring weight gain is an important indicator of worsening edema.

Immobility decreases gastrointestinal motility rather than increasing peristalsis. Reduced movement lowers stimulation of intestinal smooth muscle, resulting in slower stool progression. Increased peristalsis may occur with conditions such as diarrhea or intestinal irritation. This finding is not associated with immobility.

Immobility does not cause hyperabsorption of nutrients. Reduced activity primarily affects gastrointestinal movement rather than increasing intestinal absorption. Nutrient absorption is influenced by digestive function, intestinal health, and metabolic factors. This finding is unrelated to immobility.

Immobility increases the risk of aspiration due to decreased mobility, impaired positioning, and possible reduced swallowing effectiveness. It does not decrease aspiration risk. Patients with limited mobility require proper positioning and precautions to prevent respiratory complications. This option describes the opposite effect.

Respiratory acidosis occurs when inadequate ventilation causes carbon dioxide retention, resulting in an increased PaCO₂ level. This client has a PaCO₂ of 36 mmHg, which is within the normal range. The decreased pH is related to low bicarbonate, not respiratory dysfunction.

Respiratory alkalosis occurs when excessive ventilation causes decreased PaCO₂ and an elevated pH. This client has an acidic pH and a normal PaCO₂ level. The abnormal value is the reduced bicarbonate level, identifying a metabolic rather than respiratory imbalance.

Metabolic alkalosis results from increased bicarbonate levels or loss of gastric acid, causing an elevated pH. Conditions such as prolonged vomiting or excessive antacid use can cause this imbalance. This client has decreased bicarbonate and acidosis, ruling out metabolic alkalosis.

Respiratory alkalosis occurs when excessive ventilation causes decreased PaCO₂ levels and increased blood pH. Conditions such as anxiety, fever, or pulmonary embolism can trigger hyperventilation. COPD typically causes hypoventilation and carbon dioxide retention rather than respiratory alkalosis.

Metabolic acidosis results from excess acid production or bicarbonate loss, causing decreased HCO₃⁻ levels. Common causes include diabetic ketoacidosis, renal failure, and severe diarrhea. COPD-related confusion and lethargy are associated with carbon dioxide accumulation, not a primary metabolic disorder.

Metabolic alkalosis occurs when there is excessive bicarbonate retention or loss of hydrogen ions, resulting in increased blood pH. Causes include prolonged vomiting, diuretic therapy, and excessive antacid use. It does not explain the neurologic effects caused by carbon dioxide retention in COPD.

Hyponatremia occurs when serum sodium levels decrease due to excess water retention or sodium loss. It may cause neurologic changes such as confusion, headache, and seizures. Although sodium loss can occur with some fluid losses, hyponatremia is not the typical electrolyte imbalance associated with fluid volume deficit.

Hypokalemia results from decreased potassium levels and may occur with gastrointestinal losses or diuretic therapy. It causes muscle weakness and cardiac rhythm disturbances rather than representing the primary electrolyte imbalance of fluid volume deficit. Sodium concentration changes are more closely related to overall fluid balance.

Hyperkalemia occurs when serum potassium levels increase, often due to renal impairment, tissue injury, or potassium retention. It can cause cardiac abnormalities such as peaked T waves and dysrhythmias. It is not a typical finding caused by fluid volume deficit.

Aldosterone does not cause excretion of sodium and water. It promotes sodium reabsorption in the distal nephron, which increases water retention and expands blood volume. It also increases potassium excretion rather than potassium retention. Therefore, this mechanism is incorrect.

Aldosterone promotes sodium reabsorption, but it does not directly cause water resorption alone. Water follows sodium through osmotic movement, increasing intravascular volume. Aldosterone also increases potassium excretion, making this option incomplete and incorrect.

Aldosterone does not cause potassium retention. Increased aldosterone activity leads to potassium loss through renal excretion, which can result in hypokalemia. Water retention occurs because sodium is reabsorbed, not because water is directly retained without sodium movement. Therefore, this option is incorrect.

Filtration is the process of fluid movement from the intravascular space into the interstitial space due to pressure differences. It is not the specific type of pressure that creates the pushing force. Hydrostatic pressure is the force responsible for driving filtration across capillary walls.

Plasma pressure is not the term used to describe the pushing force of fluid inside a vessel. Plasma contains proteins that contribute to oncotic pressure, which pulls water into the bloodstream. It does not describe the outward pressure created by fluid volume.

Hemodilution refers to the decreased concentration of blood components caused by increased plasma volume. It is not a pressure mechanism involved in fluid movement. Hemodilution may occur after excessive fluid administration but does not cause filtration.