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Carolyn Y Ho

Publications and source records attributed to Carolyn Y Ho.

9 recordsLinked to original sources
PubMed2026

Social Determinants of Health and Clinical Outcomes in Hypertrophic Cardiomyopathy.

IMPORTANCE: Area-based indicators of social determinants of health (SDOH) are associated with higher risk for acquired heart disease, but their impact on conditions with a strong genetic etiology, such as hypertrophic cardiomyopathy (HCM), is not well understood. OBJECTIVE: To determine the association of area-based SDOH with clinical outcomes in patients with HCM. DESIGN, SETTING, AND PARTICIPANTS: This multicenter, prospective cohort study was conducted among US adult patients with HCM from 5 sites in the Sarcomeric Human Cardiomyopathy Registry (a multicenter prospective registry of patients with HCM) who were followed up for a median (IQR) period of 2.15 (0.15-5.82) years. Data were entered from 2015 to March 2024, and data analysis was completed from March 2024 to June 2025. EXPOSURES: Patients' residential addresses were geocoded at the zip code level and linked to the American Communities Survey to estimate area-based (1) median household income and (2) social deprivation index (SDI), which ranges from 0 to 100, with higher scores indicating a more deprived area. MAIN OUTCOMES AND MEASURES: Multivariate models, adjusting for age at diagnosis, body mass index, hypertension, and sex, were used to estimate the independent association of area-based median household income and SDI with heart failure (HF), ventricular arrhythmias (VA), and an overall composite outcome (VA, HF, atrial fibrillation, stroke, and death). RESULTS: Among 4431 US adult patients with HCM, median (IQR) age at HCM diagnosis was 51.3 (38.9-61.6) years, and 1862 patients (42.0%) were female. Median (IQR) area-based household income was $80&#x202f;000 ($60&#x202f;000-$110&#x202f;000), and median (IQR) SDI was 25 (10-55). Adjusted hazard ratios comparing the lowest income group to the highest income group were 2.07 (95% CI, 1.77-2.42; P&#x2009;<&#x2009;.001) for HF, 1.31 (95% CI, 0.97-1.78; P&#x2009;=&#x2009;.08) for VA, and 1.52 (95% CI, 1.36-1.69; P&#x2009;<&#x2009;.001) for the overall composite outcome. Adjusted hazard ratios comparing the highest SDI (ie, more deprived) group to the lowest SDI group were 1.48 (95% CI, 1.29-1.70; P&#x2009;<&#x2009;.001) for HF, 1.55 (95% CI, 1.15-2.09; P&#x2009;=&#x2009;.004) for VA, and 1.36 (95% CI, 1.22-1.50; P&#x2009;<&#x2009;.001) for the overall composite outcome. CONCLUSIONS AND RELEVANCE: In this multicenter cohort study, residing in an area with lower median household income or worse SDI were each independently associated with adverse clinical outcomes in patients with HCM. These findings suggest that despite the genetically determined nature of HCM, place of residence is associated with patient outcomes.

Humans↗
PubMed2026

Physical Activity and Cardiovascular Outcomes in Phenotype-Negative Cardiomyopathy Variant Carriers.

IMPORTANCE: Exercise may lead to disease progression and higher risk of sudden death in individuals with genetic cardiomyopathies, but the effects of exercise among individuals carrying a cardiomyopathy-associated variant without clinical manifestations (G+P-) are unclear. OBJECTIVE: To examine whether the effects of moderate to vigorous physical activity (MVPA) on cardiovascular (CV) outcomes, cardiac structure and function, and risk of developing overt cardiomyopathy and malignant ventricular arrhythmias (VAs) vary by G+P- status. DESIGN, SETTING, AND PARTICIPANTS: UK Biobank participants with whole-genome sequencing providing 1 week of accelerometer-based physical activity data and without prevalent heart failure (HF), atrial fibrillation (AF), cardiomyopathy, VAs, or implantable cardioverter-defibrillators were included in this cohort study. The study was conducted at 22 assessment centers throughout the UK from February 2013 to December 2015 with a median follow-up of 8 years. Data were analyzed from March 2024 to June 2025. EXPOSURE: Accelerometer-measured MVPA (minutes/week). MAIN OUTCOMES AND MEASURES: Associations were analyzed between MVPA volume and future incidence of adverse CV outcomes (AF, HF, myocardial infarction [MI], and stroke), cardiac magnetic resonance (CMR)-based measures of cardiac remodeling, and surrogates for clinical cardiomyopathy onset (cardiomyopathy and VA). Associations were compared between G+P- carriers and noncarriers. RESULTS: Among 84&#x202f;699 individuals (mean [SD] age, 62 [8] years; 48&#x202f;353 [57%] women; 3979 G+P- carriers), greater MVPA was associated with a lower risk of adverse CV outcomes over a median (IQR) 8.0 (7.5-8.5) years, irrespective of genotype. In multivariable models, higher MVPA was broadly associated with lower risk of incident CV disease in G+P- carriers (hazard ratio [HR] at optimal MVPA level vs zero [95% CI], AF: 0.68 [0.58-0.79]; HF: 0.58 [0.47-0.71]; MI: 0.49, [0.24-1.00]; stroke: 0.35 [0.12-0.99]). For G+P- carriers, MVPA in the range of 100 to 400 minutes per week was generally associated with lowest risk. Among individuals with CMR imaging, MVPA was associated with a similar pattern and extent of cardiac remodeling (eg, left ventricular dilation and left ventricular hypertrophy) in G+P- carriers vs noncarriers. Among G+P- carriers, higher MVPA was associated with lower risk of incident cardiomyopathy (HR at optimal MVPA vs 0, 0.03; 95% CI, 0.00-0.98) with no increase in risk of VA (eg, HR at 400 minutes of MVPA vs 0, 0.98; 95% CI, 0.83-1.14). Findings were generally consistent across variants associated with dilated cardiomyopathy, hypertrophic cardiomyopathy, or arrhythmogenic right ventricular cardiomyopathy, although precision of estimates for arrhythmogenic right ventricular cardiomyopathy were limited. CONCLUSIONS AND RELEVANCE: In this cohort study, MVPA within the general range of guideline-based recommendations was associated with lower risk of adverse CV outcomes and similar degrees of cardiac remodeling for G+P- carriers compared to noncarriers. Findings support the appropriateness of guideline-based MVPA recommendations for G+P- carriers.

Humans↗
PubMed2006

Novel locus for an inherited cardiomyopathy maps to chromosome 7.

BACKGROUND: Genetic mutations are the most common cause of hypertrophic cardiomyopathy (HCM) and an increasingly recognized cause of dilated cardiomyopathy. Autosomal dominant HCM is caused by mutations in sarcomere proteins; such mutations are not universally present, however, and fail to account for &40% of cases of phenotypic HCM. To add further complexity, other genetic origins can mimic the gross clinical phenotype of HCM, and mutations in sarcomere genes have been demonstrated to cause dilated cardiomyopathy. METHODS AND RESULTS: To explore novel genetic causes of inherited cardiomyopathies, genome-wide linkage analysis was used to study one kindred (4 generations, 32 individuals) with predominant clinical features of left ventricular hypertrophy in addition to cardiac dilation, end-stage heart failure, and sudden death. Of note, histopathology from 2 family members did not demonstrate myocyte disarray and fibrosis, indicating that this phenotype is not typical sarcomere mutation HCM. Direct DNA sequencing was performed on sarcomere genes known to cause HCM and dilated cardiomyopathy, and no mutations were identified. Linkage was then established to a novel locus on chromosome 7 (7p12.1-7q21). A maximum 2-point logarithm of odds score of 4.11 was obtained. Recombination events refine the disease interval between D7S506 and D7S3314, corresponding to a distance of 27.2 megabases. CONCLUSIONS: The discovery of a novel genetic locus in this family provides more evidence that molecular pathways leading to inherited cardiac hypertrophy extend beyond the sarcomere. Identification of the causal gene mutation and additional genotype-phenotype correlation studies will provide fundamental insight into mechanisms of cardiac remodeling.

Alleles↗
PubMed2005

Gene mutations in apical hypertrophic cardiomyopathy.

BACKGROUND: Nonobstructive hypertrophy localized to the cardiac apex is an uncommon morphological variant of hypertrophic cardiomyopathy (HCM) that often is further distinguished by distinct giant negative T waves and a benign clinical course. The genetic relationship between HCM with typical hypertrophic morphology versus isolated apical hypertrophy is incompletely understood. METHODS AND RESULTS: Genetic cause was investigated in 15 probands with apical hypertrophy by DNA sequence analyses of 9 sarcomere protein genes and 3 other genes (GLA, PRKAG2, and LAMP2) implicated in idiopathic cardiac hypertrophy. Six sarcomere gene mutations were found in 7 samples; no samples contained mutations in GLA, PRKAG2, or LAMP2. Clinical evaluations demonstrated familial apical HCM in 4 probands, and in 3 probands disease-causing mutations were identified. Two families shared a cardiac actin Glu101Lys missense mutation; all members of both families with clinical manifestations of HCM (n=16) had apical hypertrophy. An essential light chain missense mutation Met149Val caused apical or midventricular segment HCM in another proband and 5 family members, but 6 other affected relatives had typical HCM morphologies. No other sarcomere gene mutations identified in the remaining probands caused apical HCM in other family members. CONCLUSIONS: Sarcomere protein gene mutations that cause apical hypertrophy rather than more common HCM morphologies reflect interactions among genetic etiology, background modifier genes, and/or hemodynamic factors. Only a limited number of sarcomere gene defects (eg, cardiac actin Glu101Lys) consistently produce apical HCM.

Adult↗
PubMed2005

Postinfarction ventricular septal defect with pseudoaneurysm repair after failed percutaneous closure.

Ventricular septal defect with intramyocardial dissection of the ventricular free wall is a rare complication of myocardial infarction associated with poor prognosis. We describe a patient who developed a ventricular septal defect with intramyocardial dissection of the right ventricular free wall. Initially the patient was successfully stabilized by the placement of a percutaneous closure device. The placement of the device allowed initial hemodynamic recovery of the patient and subsequent definitive surgical repair. This case illustrates the importance of collaboration between interventional cardiologists and cardiac surgeons in the treatment of complex postinfarction ventricular septal defects.

Aneurysm, False↗
PubMed2002

Assessment of diastolic function with Doppler tissue imaging to predict genotype in preclinical hypertrophic cardiomyopathy.

BACKGROUND: Unexplained left ventricular hypertrophy (LVH) is considered diagnostic of hypertrophic cardiomyopathy (HCM) but fails to identify all genetically affected individuals. Altered diastolic function has been hypothesized to represent an earlier manifestation of HCM before the development of LVH; however, data regarding the clinical utility of imaging techniques that assess this parameter are limited. METHODS AND RESULTS: Echocardiographic studies including Doppler tissue imaging (DTI) were performed in a genotyped HCM population with beta-myosin heavy chain (beta -MHC) mutations. Genotype (+) individuals with LVH (G+/LVH+; n=18) and genotype (+) individuals without LVH (G+/LVH-; n=18) were compared with normal control subjects (n=36). Left ventricular ejection fraction (EF) was significantly higher in both genotype (+) groups (75+/-5% and 71+/-6%, respectively, versus 64+/- 5% in control subjects; P<0.0001). Mean early diastolic myocardial velocities (Ea) were significantly lower in both genotype (+) subgroups, irrespective of LVH (P<0.02). However, there was substantial overlap in Ea velocities between the G+/LVH- and control groups. An Ea velocity of < or =13.5 cm/s had 86% specificity and 75% sensitivity for identifying genotype-positive subjects. The combination of EF > or =68% and Ea velocity <15 cm/s was 100% specific and 44% sensitive in predicting affected genotype. CONCLUSIONS: Abnormalities of diastolic function assessed by Doppler tissue imaging precede the development of LVH in individuals with HCM caused by beta -MHC mutations. Although Ea velocity alone was not sufficiently sensitive as a sole diagnostic criterion, the combination of Ea velocity and EF was highly predictive of affected genotype in individuals without overt manifestations of HCM.

Adult↗