WBR0042
| Author | PageAuthor::Gonzalo Romero |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Pathology |
| Sub Category | SubCategory::Cardiology |
| Prompt | [[Prompt::A 21-year-old healthy male college student is playing in a football finale game across local colleges when he suddenly falls on the ground while running. The player is found unresponsive. The Emergency Medical Services arrive promptly and initiate CPR and resuscitation measures without success. According to his family and friends, he has always been healthy and he has been playing football since high school. Autopsies are obtained in order to determine the cause of death. Which of the following cardiac macroscopic or microscopic changes is most likely present?]] |
| Answer A | AnswerA::Symmetric left ventricular hypertrophy |
| Answer A Explanation | [[AnswerAExp::Symmetric left ventricular hypertrophy is characteristically present in patients with increased afterload, such as aortic stenosis or hypertension. This leads to the increased synthesis of actin and myosin that are arranged in a "organized fashion". Ultimately the patient develops diastolic dysfunction due to the inability of the heart to fill in with blood during diastole.]] |
| Answer B | AnswerB::White appearance of the endocardium |
| Answer B Explanation | [[AnswerBExp::A white appearance of the endocardium can be present in endocardial fibroelastosis, a rare restrictive cardiomyopathy present in young children less than 2 years old. It is caused by the excessive fibrosis of the endocardium that causes diastolic dysfunction. Shown below is an image depicting an autopsy of a heart affected with endocardial fibroelastosis.
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| Answer C | AnswerC::Cardiomyocytes hypertrophy in an organized fashion |
| Answer C Explanation | [[AnswerCExp::Cardiomyocytes hypertrophy in an organized fashion is present among patients with increased afterload such as aortic stenosis or hypertension.]] |
| Answer D | AnswerD::Prominent ventricular septum hypertrophy |
| Answer D Explanation | [[AnswerDExp::Prominent ventricular septum hypertrophy is a characteristic finding of hypertrophic cardiomyopathy.]] |
| Answer E | AnswerE::Fibrotic thickening of the endocardium and the valves of the right side of the heart |
| Answer E Explanation | [[AnswerEExp::Fibrotic thickening of the endocardium and the valves of the right side of the heart is the macroscopic description of an endocardium affected by a carcinoid syndrome due to chronic serotonin exposure, which causes fibrosis of the tricuspid valve and pulmonary valve. Carcinoid syndrome occurs when the carcinoid tumor metastasize to the liver. The patient clinically presents with diarrhea, wheezing, telangiectasias, and flushing of the skin.]] |
| Right Answer | RightAnswer::D |
| Explanation | [[Explanation::This young athlete presents with sudden cardiac death during intense exercise due to ventricular arrhythmias, a typical clinical presentation of hypertrophic cardiomyopathy, also known as hypertrophic obstructive cardiomyopathy (HOCM), asymmetrical septal hypertrophy or idiopathic hypertrophic subaortic stenosis (IHSS). Hypertrophic cardiomyopathy can be either autosomal dominant or idiopathic.
Educational Objective: Hypertrophic obstructive cardiomyopathy (HOCM) is a common cause of sudden death in young athletes during intense exercise. It is characterized by the presence of cardiac hypertrophy more prominent in the ventricular septum and hypertrophied cardiomyocytes in disarray. |
| Approved | Approved::Yes |
| Keyword | WBRKeyword::Cardiology, WBRKeyword::Pathology, WBRKeyword::Hypertrophic cardiomyopathy, WBRKeyword::HOCM |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |
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