Drawing Logical Inferences Flashcards

A dietitian observes that a hospitalized patient's serum albumin has declined from 3.8 g/dL on admission to 2.9 g/dL after 10 days. The patient has had poor oral intake throughout. The MOST warranted inference is:

Answer: The patient has developed protein-energy malnutrition, likely compounded by acute illness inflammatory response

Declining albumin in the context of poor oral intake and acute illness is most consistent with protein-energy malnutrition exacerbated by inflammatory cytokine-mediated protein redistribution.

A pharmacist notices that three separate patients developed QT prolongation within 48 hours of starting the same new antiarrhythmic medication. What is the MOST logically warranted inference at this stage?

Answer: There is a plausible causal signal between the medication and QT prolongation that warrants pharmacovigilance reporting and increased monitoring

Three clustered cases within 48 hours of a new drug constitute a pharmacovigilance signal warranting reporting and monitoring, but not yet a definitive causal conclusion.

A clinical researcher finds that in a randomized controlled trial, the intervention group had a 25% reduction in 30-day readmissions (p=0.03, 95% CI: 5%–45%). Which inference is MOST defensible?

Answer: The intervention likely reduces readmissions, though the wide confidence interval suggests the true effect could range from modest to substantial

Statistical significance (p=0.03) supports a real effect, but the 95% CI (5%–45%) indicates substantial uncertainty about the true effect size.

A nurse observes that a patient's blood glucose has risen from 110 mg/dL to 280 mg/dL since morning. The patient reports not eating and denies receiving any glucose infusions. What inference is MOST logically warranted?

Answer: Investigate for physiological stress response (infection, surgery, MI) or corticosteroid administration as likely causes of the glucose rise

Unexplained hyperglycemia in a fasting patient without glucose intake suggests stress hyperglycemia from infection, physiologic stress, or medications like corticosteroids.

A study reports that nurses who work more than 12-hour shifts make 3× more medication errors than those working 8-hour shifts. A hospital administrator infers that all 12-hour shifts should be eliminated immediately. This inference is:

Answer: Overextended — the data supports concern and investigation but not immediate policy elimination without considering nurse staffing and patient outcomes

Strong correlation data warrants action, but immediately eliminating 12-hour shifts without analyzing staffing implications and alternative options is a disproportionate inference.

A respiratory therapist reads: 'Among asthmatic children in our cohort, those who used controller inhalers daily had 70% fewer emergency department visits than those who did not.' Which inference is MOST appropriate?

Answer: Daily controller inhaler use is associated with significantly fewer ED visits; this supports adherence counseling as a clinical priority

Cohort data supports an associative inference with clinical implications for adherence counseling, but does not establish causal proof or universal efficacy.