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Long-term survival after cardiac arrest in hypertrophic cardiomyopathy.

Abstract：

BACKGROUND:Patients with hypertrophic cardiomyopathy (HCM) and aborted cardiac arrest are generally regarded as a high-risk subgroup susceptible to future major cardiac events and an unfavorable prognosis. However, outcome over extended time periods after major arrhythmic events is unresolved in such HCM patients. OBJECTIVE:This study sought to more completely define the natural history of HCM. METHODS:Of 916 HCM patients in the Minneapolis Heart Institute registry, 39 experienced either cardiac arrest (n = 21) or an appropriate shock from a prophylactically implanted cardioverter-defibrillator (ICD) (n = 18), and were assessed prospectively. RESULTS:Age at initial arrhythmic event was 34 +/- 17 years (range 8 to 68; 67% <40 years). Of the 39 study patients, 32 (82%) survived after their initial cardiac event (for 9.4 +/- 7.6 years; up to 30 years), including 14 patients for >or=10 years (36%) and 4 patients >or=20 years (10%). Of the 32 survivors, 15 (47%) have not experienced subsequent events, and 17 (53%) had >or=1 additional cardiac arrest or appropriate ICD intervention. Annual HCM-related mortality was 1.4%, similar to general HCM populations, and 88% of patients were free of HCM-related death over the follow-up period. Survival from potentially lethal arrhythmias was associated with no or only mild heart failure symptoms in 29 of 32 patients (91%) at most recent evaluation. CONCLUSION:In HCM, long-term survival up to 30 years may follow cardiac arrest with or without ICD intervention. Disabling heart failure symptoms were uncommon after these arrhythmic events, at last follow-up. These novel observations regarding the natural history of HCM underscore the unpredictability of the arrhythmogenic substrate, which may remain dormant over extended periods of time.

journal_name

Heart Rhythm

journal_title

Heart rhythm

authors

Maron BJ,Haas TS,Shannon KM,Almquist AK,Hodges JS

doi

10.1016/j.hrthm.2009.03.014

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

993-7

issue

7

eissn

1547-5271

issn

1556-3871

pii

S1547-5271(09)00289-6

journal_volume

6

pub_type

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