Chaos ๐งช
What is the classic cardiotoxicity of anthracyclines and its mechanism?
Dilated cardiomyopathy; free radical-mediated oxidative damage to cardiomyocytes โ dose-dependent and largely irreversible
What shunt direction occurs in an uncorrected VSD and what murmur does it produce?
Left-to-right shunt; harsh holosystolic murmur at left lower sternal border
Type A vs Type B aortic dissection โ define and first-line management of each?
Type A: involves ascending aorta โ emergent surgery. Type B: descending only โ medical management (beta-blocker, BP control) unless complicated
What ECG finding in an athlete is normal and does not require further workup?
Sinus bradycardia, first-degree AV block, early repolarization, incomplete RBBB, voltage criteria for LVH โ all training-related normal variants
Digoxin toxicity classic ECG finding?
Scooped ST depression ("Salvador Dali" sign) โ also bradyarrhythmias, heart block, bidirectional VT in severe toxicity
A physician has no federal taxes withheld on 1099 moonlighting income until April โ what IRS penalty applies?
Underpayment penalty โ quarterly estimated taxes required; safe harbor is paying 100% of prior year tax liability quarterly, otherwise 8% penalty on underpayment amount
Trastuzumab cardiotoxicity differs from anthracyclines in what two key ways?
largely reversible with drug discontinuation
not dose-dependent โ mechanism is HER2 receptor blockade impairing cardiomyocyte repair rather than direct toxic injury
Eisenmenger syndrome โ define it and name two absolute contraindications once established?
Reversal of left-to-right to right-to-left shunt due to pulmonary hypertension; contraindications: defect closure (fatal) and pregnancy (maternal mortality up to 50%)
What genetic syndrome has hypertelorism, bifid uvula/cleft palate, arterial tortuosity โ TGFBR1/2 mutation?
Loeys-Dietz syndrome
Athlete's heart vs HCM โ what wall thickness is the gray zone where differentiation is difficult?
13โ15mm โ below this is almost always athlete's heart; above 16mm is almost always pathologic
QT prolonging drugs โ name the four drug classes most commonly responsible for drug-induced torsades?
antiarrhythmics (sotalol, dofetilide, amiodarone),
antipsychotics (haloperidol, quetiapine)
antibiotics (azithromycin, fluoroquinolones),
antiemetics (ondansetron, metoclopramide)
What is the self-employment tax rate?
Bonus: what income does it apply to?
15.3%
Fluorouracil cardiotoxicity โ mechanism and which patients are highest risk?
Coronary vasospasm causing demand ischemia
highest risk in patients with pre-existing CAD or prior chest radiation โ occurs in up to 10% of patients
In repaired TOF, what is the most common cause of late sudden death and its substrate?
Ventricular tachycardia via scar-mediated reentry at RVOT surgical scar (ventriculotomy or transannular patch); QRS duration >180ms is the strongest non-invasive risk marker โ distinct from overall late mortality which is dominated by RV failure from chronic pulmonary regurgitation
Complicated vs uncomplicated Type B dissection โ name three complications mandating intervention?
malperfusion (renal, mesenteric, spinal)
rupture or impending rupture
rapid expansion >1cm/year
refractory pain
hypertension despite maximal medical therapy
What is the physiologic explanation for athlete's bradycardia and high vagal tone?
Enhanced parasympathetic tone + increased stroke volume from cardiac remodeling โ lower resting HR required to meet cardiac output needs; intrinsic SA node rate also decreases with sustained training
Tricyclic antidepressant overdose โ mechanism of cardiotoxicity and ECG finding?
Sodium channel blockade โ wide QRS; also alpha blockade (hypotension) and anticholinergic effects (tachycardia); terminal R wave in aVR >3mm predicts arrhythmia risk
What is the difference between a revocable and irrevocable trust and why would a high-earning physician choose the latter?
Revocable: you control it, can change it, assets still in your estate for tax purposes.
Irrevocable: you give up control, assets removed from your taxable estate โ used for asset protection from malpractice, Medicaid planning, and reducing estate tax exposure above the $13.6M federal exemption (2024)
Per ACC cardio-oncology guidelines, when should cardioprotective therapy be started during anthracycline treatment?
ACE inhibitor/ARB + beta-blocker initiated when EF drops โฅ10% or GLS declines >15% โ some centers start prophylactically in high-risk patients (prior cardiac disease, high cumulative dose.
Scimitar syndrome โ describe the anatomy and its hemodynamic consequence?
Partial anomalous pulmonary venous return of right lung to IVC โ left-to-right shunt; scimitar sign on CXR (curved vessel shadow); associated with right lung hypoplasia and dextroposition of heart![]()
Loeys-Dietz syndrome vs Marfan โ which has more aggressive aortic disease and why?
Loeys-Dietz โ TGFBR1/2 mutation causes more diffuse arterial tortuosity and aneurysms throughout entire arterial tree (not just aorta); dissection occurs at smaller diameters than Marfan; surgical threshold 4.0โ4.5 cm vs 4.5โ5.0 cm in Marfan; also intracranial aneurysms, cervical spine instability โ requires whole-body MRA surveillance annually
In exercise-induced hypertension, what is the SBP definition (men and women), and significance?
SBP >210 mmHg in men or >190 mmHg in women at peak exercise โ associated with increased risk of future resting hypertension and LVH; consider antihypertensive therapy if exaggerated response with normal resting BP
Clozapine cardiac toxicity โ what life-threatening complication occurs and when in treatment course?
Myocarditis โ occurs in first 4โ8 weeks of treatment; also cardiomyopathy with chronic use; monitor troponin and CRP weekly for first month; discontinue immediately if myocarditis suspected
Name the two most important disability optional riders and why each matters?
(1) Future increase option (FIO) โ locks in ability to increase coverage as attending income grows without new medical underwriting; critical before any health changes occur.
(2) Own-occupation rider โ ensures benefit pays if you can't perform subspecialty specifically even if you can still practice general medicine; without it, policy may deny claim if you can see office patients
Clonal hematopoiesis of indeterminate potential (CHIP) โ why is it relevant to cardio-oncology?
CHIP mutations (TET2, DNMT3A) independently increase cardiovascular risk โ accelerate atherosclerosis and heart failure; also increases risk of chemotherapy cardiotoxicity; emerging screening target in cardio-oncology
Name four specific long-term complications of Fontan circulation and their mechanisms?
Protein-losing enteropathy (elevated venous pressure โ gut lymphatic leak)
Fontan-associated liver disease (hepatic venous congestion โ fibrosis โ HCC)
plastic bronchitis (lymphatic casts in airways)
atrial arrhythmias (massively dilated atria from chronic high pressure)
Ehlers-Danlos Type IV โ why is surgical mortality so high and what is the management strategy?
COL3A1 mutation causes Type III collagen deficiency โ arterial walls extremely fragile, tear with minimal manipulation; sutures pull through tissue; surgical mortality 5โ10x higher than standard aortic surgery;
Management: avoid elective surgery, angiography only if absolutely necessary, conservative management of dissection/rupture when possible โ most patients die from spontaneous arterial rupture not amenable to repair
Wolff-Parkinson-White in an asymptomatic athlete โ when is ablation recommended per current guidelines?
Electrophysiology study recommended to risk-stratify; ablation recommended if SPERRI <250ms or ERP <250ms during EP study โ asymptomatic WPW with high-risk EP findings warrants ablation before competitive sport clearance
Chloroquine/hydroxychloroquine overdose โ ECG findings and how do you treat it?
Wide QRS, QT prolongation, ventricular arrhythmias โ sodium channel blockade similar to TCA; sodium bicarbonate alkalinizes serum, reduces drug-channel binding, narrows QRS; also treat hypokalemia aggressively
Explain how S-corp election reduces self-employment tax, the IRS reasonable salary requirement, and the risk of underpaying salary.
S-corp splits income into W2 salary (subject to FICA 15.3%) and distributions (not subject to FICA); IRS requires "reasonable compensation" for services โ typically 40โ60% of net profit; underpaying salary triggers IRS audit, back FICA taxes, penalties; savings of $10,000-$30,000/year at high income levels if structured correctly