| An extremely rare type of heart-hand syndrome. Described in two families to date, with characteristics of upper limb malformations (brachytelephalangy type D, hypoplastic deltoids, mild shortening of the fourth and fifth metacarpals in some individuals, skeletal anomalies in the humerus, radius, ulnae, and thenar bones) and cardiac arrhythmias (junctional rhythms and atrial fibrillation). |