Managing Systemic Diseases Flashcards

A patient with a pacemaker is undergoing dental sedation. The dental team primary concern regarding equipment use is:

Answer: Electromagnetic interference from electrosurgical units or ultrasonic scalers

Electrosurgical units and some ultrasonic devices can emit electromagnetic interference that may inhibit or inappropriately trigger a pacemaker.

Which hepatic condition MOST significantly impairs drug metabolism and prolongs sedation duration?

Answer: Cirrhosis with significant hepatic function loss

Cirrhosis reduces hepatic blood flow, CYP450 enzyme activity, and plasma protein synthesis, profoundly impairing the metabolism of most sedative agents.

A patient with COPD and a history of CO2 retention may have respiratory drive dependent on:

Answer: Peripheral chemoreceptors responding to hypoxic drive

Chronic CO2 retainers adapt to elevated CO2 and may rely on peripheral chemoreceptor hypoxic drive. Supplemental oxygen given too liberally can suppress this drive.

A patient with a known history of malignant hyperthermia (MH) requires sedation. The MOST important anesthetic consideration is:

Answer: Avoiding all triggering agents (volatile anesthetics and succinylcholine)

MH is triggered by volatile halogenated anesthetics (e.g., halothane, sevoflurane) and succinylcholine. A trigger-free anesthetic must be used.

A patient who is morbidly obese (BMI greater than 40) presents unique challenges during sedation because:

Answer: Decreased FRC, increased airway difficulty, and altered pharmacokinetics create higher risk

Morbid obesity reduces FRC (faster desaturation), increases airway difficulty (large tongue, short neck), and alters drug pharmacokinetics, demanding heightened vigilance.

For patients taking monoamine oxidase inhibitors (MAOIs), which opioid interaction is potentially fatal?

Answer: Meperidine (pethidine) + MAOI causing serotonin syndrome or hyperpyrexic crisis

Meperidine + MAOI combination can trigger a life-threatening serotonin syndrome characterized by hyperthermia, seizures, cardiovascular instability, and death.