ABA BASIC common mistakes
ABA BASIC · Understand the traps and how to avoid them.
Reading the vignette, recognizing a familiar clinical script, and locking onto an option before reading the final qualifier in the stem ('which is the MOST likely', 'the INITIAL step', 'is contraindicated').
Pattern recognition fires within the first sentence or two and feels satisfying; under time pressure the candidate evaluates options against the remembered scenario rather than against the specific question actually asked.
What to do instead
Read the last line of the stem before the options and paraphrase the task in your own words ('they want the first action, not the diagnosis'). Then eliminate each option that answers a different task, even if the statement itself is factually true.
Working a calculation (dose, vaporizer output, circuit or cylinder volume, MAC fraction, shunt fraction) and dropping units partway through, e.g., adding a pressure in cmH2O to one in mmHg, or treating mg/kg as mg.
Formula recall gets rehearsed while unit bookkeeping does not; exam stems deliberately mix units, and candidates reproduce a memorized number pattern instead of carrying dimensions through.
What to do instead
Write the unit beside every number in the scratch space and cancel units before multiplying. Then sanity-check the magnitude against a value you already know (e.g., is this dose in the range you would actually give, is this volume plausible for the circuit).
Studying pharmacology as lists of indications and side effects, so on exam day you cannot predict how onset, offset, or accumulation change with renal or hepatic failure, obesity, low albumin, or a change in cardiac output.
Lists are easier to make and re-read than time-course reasoning, and most day-to-day clinical exposure does not force you to compute it.
What to do instead
Rebuild each drug around three questions: where does it distribute, how is it cleared, and what changes the free fraction. Practice with volume of distribution and context-sensitive half-time problems framed as 'what happens to this infusion after 6 hours in this patient'.
Confusing oxygen content with oxygen delivery, and arterial with mixed-venous blood - misassembling CaO2 from its terms or concluding that a normal PaO2 rules out a severe shunt.
The equation is memorized as a string of symbols rather than as a statement about carried versus dissolved oxygen; the dissolved term is small enough that candidates forget when it matters and double-count the hemoglobin term.
What to do instead
Rewrite the content and delivery equations from scratch until each term's clinical meaning is explicit, then work shunt and A-a gradient vignettes where PaO2 is normal or high but content and delivery are not. Predict the direction of change before computing.
Treating a monitor value as the diagnosis - choosing an intervention for a low blood pressure, a falling end-tidal CO2, or a rising peak airway pressure without first deciding whether the problem is ventilation, oxygenation, perfusion, or equipment.
Numbers are salient and invite an immediate reflex response, and the option list usually contains a plausible drug or ventilator change that matches the number rather than the cause.
What to do instead
Force a one-line structured reassessment before touching the options: is this a ventilation problem, an oxygenation problem, or a perfusion problem, and what is the fastest way to tell? Eliminate any option that treats the number without naming a mechanism.
Mixing sequences and doses across emergency algorithms - giving a LAST or malignant hyperthermia intervention in the wrong order, or importing a dose or drug from one protocol into another.
Crisis algorithms are learned as overlapping bundles of drugs and actions, and under exam pressure the most memorable item surfaces first regardless of which algorithm the stem describes.
What to do instead
Write each crisis algorithm as an ordered list with the trigger, the first three actions, and the specific drug with dose and route, and rehearse them side by side so the differences (not the similarities) are what you study.
Answering patient-safety and professionalism items from personal conviction rather than from a standard you can name - deciding unilaterally whether an event is a near miss or a sentinel event, or picking the 'most ethical' sounding option on consent, confidentiality, or disclosure of a complication.
These items read like opinion questions, so candidates stop reasoning and default to the answer that sounds most virtuous rather than the one that matches accepted definitions or institutional and legal obligations.
What to do instead
Learn the definitions cold (error, at-risk behavior, violation, near miss, sentinel event) and the intervention hierarchy from forcing functions and standardization down to education and warnings. For each option, name the standard it satisfies or violates before choosing.
Refusing to move on from a low-yield calculation or obscure fact early in a block, then rushing the final third of the questions and abandoning the ones you could have answered.
Sunk cost plus the fear of leaving a blank; candidates also overestimate how quickly they will recover the lost time on later items.
What to do instead
Adopt an explicit two-pass rule: answer everything you can decide within about a minute, flag the rest, and return only after the block is complete. Revisit flagged items with a specific reason to change, not because the answer 'looked better' the second time.
Answering subspecialty vignettes with a general-operating-room default - applying the adult, non-pregnant, normal-physiology plan to obstetric, pediatric, cardiac, or neurosurgical patients whose physiology changes the correct choice.
Most candidates' exposure is weighted toward general adult cases, and the stem's population-specific cues (gravid uterus, neonatal hemoglobin, open cranium, fixed cardiac output) are buried mid-vignette.
What to do instead
Before choosing, write down the two or three physiologic facts that make this population different, and check whether the option you favor survives them. Study each subspecialty as a short list of 'what changes here' rather than as a separate textbook.
Selecting an answer on equipment or physics by name association - picking a gas law or device component because the term appears in the stem rather than checking which variables are actually held constant or which direction flow travels.
Physics items are the least-rehearsed content for most clinicians, so the candidate pattern-matches a familiar word instead of drawing the system and reasoning from it.
What to do instead
For each item, sketch the circuit or state the fixed variable before looking at the options, then name the law that applies to that fixed variable. Drill a short set of equipment items (valves, cylinder factors, vaporizer behavior, flow versus conductance) until the diagram, not the vocabulary, drives the answer.