HKCA Primary MCQ - independent subject foundations common mistakes
HKCA Primary MCQ - independent subject foundations · Understand the traps and how to avoid them.
Using pulse oximetry as a ventilation measurement
Saturation can remain reassuring despite inadequate ventilation, particularly with supplemental oxygen.
What to do instead
Assess ventilation using the relevant clinical findings, waveform and other measurements.
Equating onset with terminal half-life
Distribution and effect-site equilibration can change the observed time course.
What to do instead
Separate absorption, distribution, effect-site dynamics and elimination.
Inferring safe access from a surface landmark alone
Individual anatomical variation can change the location and relationship of structures.
What to do instead
Use the appropriate actual assessment and trained procedural process.
Treating all low bicarbonate results as a simple disorder
An additional respiratory or metabolic process can coexist with compensation.
What to do instead
Compare measured values with the appropriate expected compensatory response.
Using an ideal flow formula without its assumptions
Turbulence and real geometry can violate the laminar tube model.
What to do instead
Identify the regime and boundaries before making a numerical prediction.
Confusing precision with accuracy
Repeated measurements can cluster closely around a consistently biased value.
What to do instead
Evaluate both random variability and systematic deviation from a reference.
Interpreting a p value as the chance the null is true
The p value is calculated conditionally on the null model and assumptions.
What to do instead
Describe the probability of a result at least as extreme under that model.
Blaming an incident solely on the last individual action
Maintenance, labeling, staffing and workflow can contribute latent vulnerabilities.
What to do instead
Identify the actual contributory factors and test a practical system improvement.