Background:

Senazodan is a Ca2+ sensitiser, and also shows inhibition effect on PDE III.

Senazodan seems to affect directly the actin-myosin crossbridge kinetics, and increase myosin ATPase activity[1]. Senazodan produces a concentration-dependent increase in tension development. Senazodan enhance Ca2+ binding to myofilaments and to purified cardiac troponin C. Senazodan also enhances contractility in guinea-pig papillary muscles by inhibiting PDE III[2].

[1]. Lehtonen LA, et al. Pharmacokinetics and pharmacodynamics of intravenous inotropic agents. Clin Pharmacokinet. 2004;43(3):187-203. [2]. Erhardt L. An emerging role for calcium sensitisation in the treatment of heart failure. Expert Opin Investig Drugs. 2005 Jun;14(6):659-70.