During his time with the Suns, Toy was diagnosed with a heart condition (congenital heart block) which affected his endurance and aerobic capacity, without being a threat to his overall health.
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Isoprenaline (INN) or isoproterenol (USAN, trade names Medihaler-Iso and Isuprel) is a medication used for the treatment of bradycardia (slow heart rate), heart block, and rarely for asthma.
Key discoveries included the sequence of cardiac contraction, dual autonomic control of the heart, introduction of the concept of heart block and the experimental demonstration of the myogenic origin of the heartbeat.