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• W2038050492 abstract "1. Eight healthy subjects were studied before digoxin and after successive therapy periods of 1 week 0.125, 0.25 and 0.50 mg of digoxin. The mean serum concentrations (+/- s. d.) were 0.4 +/- 0.2, 0.6 +/- 0.3 and 1.4 +/- 0.5 nmol l-1, respectively. The effects of digitalis were studied by echocardiography and systolic time intervals at rest and after 3 min handgrip exercise. Effects of simultaneous autonomic blockade induced by atropine and propranolol were also examined. 2. Digoxin in increasing doses slowed the heart rate at rest; with the daily dose of 0.50 mg from 63 +/- 10 to 53 +/- 6 beats min-1, and fractional shortening rose from 28 +/- 6 to 33 +/- 3% (P less than 0.05 for both). Preload, afterload and cardiac output did not change. The electromechanic systolic time index (QS2I) decreased (P less than 0.001) and the observed alteration of QS2I was dose-related. 3. The influence of digoxin was similar during isometric exercise, except for unchanged fractional shortening. 4. During autonomic blockade digoxin slowed the intrinsic heart rate from 93 +/- 6 to 86 +/- 6 beats min-1 (0.25 mg) and to 83 +/- 6 beats min-1 (0.50 mg) (P less than 0.01 for both). QS2I was shortened (P less than 0.01). Echocardiographically determined ejection phase indices remained unchanged. 5. When handgrip stress was induced during autonomic blockade, digoxin evoked a clearcut increase in contractile function, resembling the effects of digoxin alone at rest. Thus, fractional shortening increased by 14% and QS2I decreased by 16 ms (P less than 0.01 for both). 6. We conclude that digoxin increases the contractility in normal heart without changes in loading conditions. The rise in inotropy at rest is obvious from both fractional shortening by echo and systolic time intervals. The same takes place during handgrip with autonomic blockade, when the heart lacks sympathetic support. The influence of long-term digoxin on heart rate is partly direct without autonomic mediation. The effect of digoxin is dose-dependent." @default.
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• W2038050492 date "1988-03-01" @default.
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• W2038050492 title "Effect of digoxin on the heart in normal subjects: influence of isometric exercise and autonomic blockade: a noninvasive study." @default.
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• W2038050492 doi "https://doi.org/10.1111/j.1365-2125.1988.tb03311.x" @default.
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