Managing Systemic Diseases Flashcards

A patient with severe COPD (FEV1 <35% predicted) presents for sedation. Which supplemental oxygen approach is most appropriate?

Answer: Titrated low-flow oxygen at 1–2 L/min via nasal cannula

Low-flow titrated oxygen (1–2 L/min) maintains adequate SpO2 while minimizing the risk of suppressing the hypoxic ventilatory drive in severe COPD patients.

Which electrolyte abnormality most commonly associated with chronic diuretic use can predispose a sedated patient to cardiac dysrhythmias?

Answer: Hypokalemia

Hypokalemia from chronic diuretic use increases cardiac membrane excitability, predisposing patients to ventricular dysrhythmias during sedation.

A patient with Addison's disease is undergoing moderate sedation for a lengthy dental procedure. What supplemental management is required?

Answer: Stress-dose corticosteroid supplementation

Patients with adrenal insufficiency cannot mount a cortisol stress response and require supplemental corticosteroids to prevent an adrenal crisis during stressful procedures.

A patient with obstructive sleep apnea (OSA) is sedated with benzodiazepines. What is the PRIMARY concern unique to this population?

Answer: Exaggerated upper airway collapse and apnea

OSA patients have anatomically and physiologically compromised upper airways; benzodiazepine-induced muscle relaxation significantly worsens upper airway obstruction and apnea.

In a patient with cirrhotic liver disease, which pharmacokinetic change is most clinically significant when dosing sedatives?

Answer: Decreased hepatic first-pass metabolism causing elevated drug levels

Cirrhosis significantly reduces hepatic metabolic capacity and decreases plasma proteins, leading to elevated free drug levels and prolonged sedative effects.

Which finding in a patient with congestive heart failure (CHF) is a contraindication to elective sedation without medical clearance?

Answer: New onset orthopnea and a recent weight gain of 10 lbs

New orthopnea and rapid weight gain indicate acute decompensated CHF, which is a contraindication to elective sedation until medically stabilized.

A hyperthyroid patient not yet rendered euthyroid presents for emergency dental sedation. Which anesthetic complication is most feared?

Answer: Thyroid storm triggered by catecholamine release

Surgical stress and catecholamine release in an uncontrolled hyperthyroid patient can precipitate thyroid storm, a life-threatening hypermetabolic crisis.