Abstract
HCM is a major cause of sudden cardiac death in young adults. The risk can be estimated using different scoring systems based on a number of selected clinical parameters. Other clinical features, such as myocardial fibrosis, LV apical aneurysms and multiple sarcomere protein gene mutations, are also used to guide ICD therapy. Prevention of sudden death relies on lifestyle modification and ICD therapy.
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Questions
Questions
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1.
A 37-year-old female with HCM presents with several episodes of syncope of the last year. They only occur in the shower and only with premenstrual. She has premonitory symptoms of warmth. She has never had exertional syncope but does have palpitations. A Holter did not show NSVT. Her echo has a 16 mm septum, left atrial size of 4.6 cm, and an intracavitary gradient of 144 mmHg. No FMH of SCD or hypotensive response to exercise. Should she get an ICD?
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A.
Yes
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B.
No
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C.
Maybe
Answer: B. By US criteria she has no high-risk features. Her syncope is most consistent with neurally mediated syncope, and thus she should generally not be treated with an ICD. By European (http://www.doc2do.com/hcm/webHCM.html) criteria, she has a 3.81% chance of SCD in 5 years, an intermediate risk. Thus, by ESC criteria, she is also not a candidate for ICD.
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A.
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2.
A 32-year-old male, diagnosed with HCM 4 years ago. Holter with NSVT of 6 beats at 150 bpm. No FMH of SCD or personal syncope or hypotensive response to exercise. Echo with LA dimension of 4.4 cm, maximal septal thickness of 23 mm, and outflow tract gradient of 77. Should he get an ICD?
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A.
Yes
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B.
No
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C.
Maybe
Answer: A. US-risk factor of NSVT which is a minor risk factor and thus other risk modifiers such as MRI scar burden, apical aneurysm, double-hit genetic abnormalities, or LVOT gradient need to be weighed. He does have a significant LVOT gradient which increases his risk of SCD. If MRI scar burden is >15%, then both of these would argue for an ICD. European risk calculator places him at 8.92% 5-year SCD risk, and thus he should get ICD.
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A.
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3.
A 17-year-old standout basketball player with syncope during basketball. Echo with maximal thickness of 21 mm, LA size of 4.2 cm, and LVOT gradient of 5 mmHg. No FMH of SCD or hypotensive response to exercise. Should she get an ICD?
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A.
Yes
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B.
No
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C.
Maybe
Answer: A. By US guidelines he has a single but strong risk factor and thus should get ICD. By ESC calculator a 5-year SCD risk of 15%, and therefore very high risk and should have ICD.
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A.
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4.
A 15-year-old female whose father died suddenly of HCM when he was 32. Echo showed maximal thickness of 17, LA dimension of 35 mm, and no LVOT gradient. No NSVT or syncope or hypotensive response to exercise. Should she get an ICD?
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A.
Yes
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B.
No
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C.
Maybe
Answer: C. By US criteria she does have a major risk factor and so ICD should be considered. By ESC calculator her 5-year risk is 3.79% and therefore ICD generally not indicated. In these situations, individualized decision-making taking into consideration potential complications and patient wishes is appropriate after a thorough discussion.
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A.
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5.
A 28-year-old male with HCM diagnosed because of LVH on ECG. His echo shows a maximal thickness of 3.2 cm, LA size of 3.8 cm, and no LVOT gradient. Holter with 7 beats NSVT of 140 bpm. No FMH of SCD. No personal history of syncope or hypotensive response to exercise. Should he get an ICD?
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A.
Yes
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B.
No
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C.
Maybe
Answer: A. By US criteria he has a major and a minor risk factor so ICD is indicated. By ESC, 5.92% 5-year risk of SCD, thus, ICD is also indicated.
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A.
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6.
The patient in question 5 is a laborer digging graves for a funeral home. A 3-lead screening ECG is shown below. Should he get a SC ICD?
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A.
Yes
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B.
No
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C.
Maybe
Answer: C. He does meet criteria for S-ICD based on the figures, which show that T wave oversensing should not occur. While there is not as much data about S-ICDs compared to transvenous ICDs, the S-ICD is an attractive alternative for him because of his job. Nevertheless, several drawbacks to S-ICD in the HCM population exist including inability to ATP, no backup pacing, and inability to identify atrial arrhythmias, and thus a careful discussion about the risks and benefits and the lack of long-term data should be performed prior to implantation.
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A.
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Elliott, P., Bockstall, K.E., Cain, M.A., Akhtar, M.M., Link, M.S. (2019). Sudden Cardiac Death Risk Assessment. In: Naidu, S. (eds) Hypertrophic Cardiomyopathy. Springer, Cham. https://doi.org/10.1007/978-3-319-92423-6_10
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