PTH and hydrops fetalis: Another study that followed 3731 men in the UK for 13 years found that elevated PTH (≥55.6 pg/mL; top quarter) was associated with a significantly higher risk of incident HF after adjustments for lifestyle characteristics, diabetes mellitus, blood lipids, blood pressure, lung function, heart rate, renal dysfunction, atrial fibrillation, forced expiratory volume in 1 s, and C-reactive protein (HR = 1.66 (95% CI, 1.30–2.13)) [4].