ABTS Thoracic Surgery common mistakes
ABTS Thoracic Surgery · Understand the traps and how to avoid them.
Selecting the operation named in the first clause of the stem before reading the remaining findings, e.g., answering "CABG" for a patient whose stem later discloses severe aortic stenosis and a 0.7 cm² valve area.
Pattern recognition fires on a familiar phrase ("triple-vessel disease") and the candidate stops encoding the rest of the vignette; the exam deliberately front-loads the distractor-compatible data.
What to do instead
Use a forced read protocol: finish the stem, then write every abnormal datum as a numbered list (lesion, gradient, LV function, comorbidities) before looking at the options, and confirm each listed item is addressed by the chosen answer.
Assigning the wrong T or N descriptor when a tumour crosses a named anatomic boundary, such as calling a tumour invading the mediastinal pleura T4, or labelling an intrapulmonary hilar node as N2.
Descriptors are memorised as a flat list from a staging table without the spatial map that makes each boundary obvious at the moment of use.
What to do instead
Rebuild the T and N maps anatomically: sketch the airway, fissures, mediastinal pleural reflections and node stations weekly, and for each practice stem say out loud which structure the tumour touches before naming the descriptor.
Choosing a systemic-to-pulmonary artery shunt for a neonate with single-ventricle physiology who already has excessive pulmonary blood flow and is in heart failure.
Operations are memorised by lesion name ("BT shunt for blue baby") instead of being derived from the patient's Qp/Qs, ventricular function and outflow obstruction.
What to do instead
Before answering any congenital palliation question, state Qp/Qs direction, aortic saturation and whether the obstruction is pulmonary or systemic; then select the palliation that moves those numbers toward the target.
Answering with the definitive operation when the question asks for the next step in a patient who is currently unstable, e.g., naming a redo CABG instead of stating that the patient needs urgent angiography, an intra-aortic balloon pump or pericardiocentesis first.
The candidate reads "management" globally and jumps to the final therapeutic destination, skipping the resuscitation or diagnostic step the stem is actually testing.
What to do instead
Circle the interrogative phrase in the stem ("next step", "most appropriate initial", "definitive") and match the level of the answer to that phrase; discard options that leap a stage ahead.
Clearing a patient for lobectomy on the basis of FEV1 alone, without calculating predicted postoperative values or interpreting the DLCO and diffusion-perfusion mismatch.
Textbook cut-off numbers (FEV1 > 1.5 L, DLCO > 60%) are recalled as standalone rules and applied without the arithmetic the exam expects.
What to do instead
Use a fixed sequence for every resection question: measured FEV1 and DLCO, then ppo values by segment count, then exercise or stair-climb data, then a decision; practice the segment-count arithmetic until it is automatic.
Mishandling the timing question in infective endocarditis or recent myocardial infarction, e.g., recommending immediate valve replacement in a stable patient with a fresh embolic stroke, or operating too early after a recent STEMI without recognising the mortality penalty.
The urgency of the underlying disease dominates the reasoning, so the competing risk of operating on recently infarcted or freshly infarcted brain tissue is not weighed.
What to do instead
For every timing question, list three clocks explicitly - infection control, neurologic stability, and myocardial healing - and state which clock governs; anchor the answer to the clock the stem makes dominant.
Managing a shunt-dependent single-ventricle patient with the adult habit of maximising inspired oxygen and ventilation, thereby dropping pulmonary vascular resistance and stealing systemic flow.
Adult cardiac training reinforces full oxygenation and normalisation of blood gases, which is exactly wrong in a Norwood or shunt-dependent circulation.
What to do instead
Memorise the target numbers for shunt-dependent physiology (systemic saturation in the high 70s to low 80s, PaCO2 in the mid 40s, minimal supplemental oxygen) and rehearse the intervention sequence for desaturation: sedate, reduce oxygen, increase CO2, then escalate.
Recommending chemical pleurodesis or early reoperation for a persistent air leak in the first days after lobectomy rather than continued drainage and patience.
The word "persistent" is read as "failure of conservative management", and the well-defined timeline distinguishing prolonged air leak from a bronchopleural fistula is not recalled.
What to do instead
Attach an explicit calendar to each thoracic complication (air leak beyond 5 days, fistula timing, space problems after lobectomy versus pneumonectomy) and answer according to where the stem sits on that calendar.
Misclassifying an acute aortic syndrome, for example treating an intramural haematoma or a type B dissection with malperfusion as if it were an uncomplicated type B to be managed medically.
Classification is recalled by the letter alone, and the malperfusion findings (acidosis, oliguria, limb ischaemia) are treated as background noise rather than as a branch point.
What to do instead
After naming the type, always ask two questions in writing - is there malperfusion, and is there a connective tissue or rupture feature - and let the answers, not the letter, select the operation.
Failing to give prostaglandin E1 as the first action in a cyanotic neonate with a ductal-dependent lesion, instead pursuing echo, transfer or catheterisation as the initial step.
Diagnostic enthusiasm overrides the recognition that ductal patency is time-critical and that any delay risks irreversible acidosis and death.
What to do instead
For any cyanotic newborn stem, scan first for ductal-dependent physiology, and when present answer "start prostaglandin and secure the airway" before anything else; rehearse the lesions that require it until the trigger is automatic.