Clinical Research Directory

Inclusion Criteria: * \- Age 1 to 18 years * Body mass index ≥95th percentile for age and sex * No previously diagnosed structural heart disease * No known primary cardiac rhythm or conduction disorder * Written informed consent from parent or legal guardian Exclusion Criteria: * \- Known structural heart disease * Known cardiac arrhythmia or conduction abnormality * Diabetes mellitus * Hypertension requiring treatment * Hypothyroidism or other endocrine disorders affecting cardiac function * Chronic renal, hepatic, respiratory, or systemic disease * Pulmonary hypertension * Obstructive sleep apnea * Medications known to affect cardiac rhythm or function * Electrolyte abnormalities * Acute significant illness at the time of assessment