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Figure 1<br />

<strong>Structure</strong>s of the positive inotropes digoxin [3,4], DPI 201-106 [15], and BDF 9148<br />

[15–17]. In digoxin the R group is (O-2,6-dideoxy-β-D-ribo-hexopyranosyl-(1 rarrow.gif 4)-O-2,<br />

6-dideoxy-β-D-ribo-hexopyranosyl-(1 rarrow.gif 4)-2, 6-dideoxy-β-D-ribo-hexopyranosyl)oxy. In<br />

DPI 201-106 the configuration at the hydroxyl-bearing carbon influences cardiac<br />

activity.<br />

Page 296<br />

fatigue, visual disturbances, and anorexia, and in cardiac side-effects that depend on the nature and<br />

extent of the underlying heart disease [3]. Careful monitoring of digoxin serum levels and bioavailability<br />

have reduced the incidence of digitalis toxicity [3] and the recent introduction of digoxin-binding<br />

antibodies or antibody fragments has provided an effective means of treating severe digitalis toxicity<br />

[3,7]. Nevertheless the quest continues for a substitute for the cardiac glycosides in the treatment of<br />

chronic CHF.<br />

Positive inotropic compounds can be classified into three groups: cAMP generators, intracellular<br />

calcium regulators, and modulators of ion channels or pumps [11]. The cAMP generators such as<br />

dopamine, dobutamine, and milrinone (a phosphodiesterase inhibitor) may worsen ischemia, cause<br />

arrhythmias, and increase mortality [2,6]. Intracellular calcium modulators have not reached clinical use,<br />

possibly because of additional effects such as vasoconstriction,<br />

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