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[Possibilities of reducing heart rate by I(f)-channel inhibitors].

The heart rate represents a marker of cardiac workload and oxygen demand. It is an expression of increased sympathetic tone und thus an important prognostic parameter. The heart rate is modulated at the sinus node by the slew rate of the slow diastolic depolarization. This is determined by the activation of the I(f)-channel. A new approach is the specific inhibition of this channel by ivabradine. Clinically, this drug leads to a decrease of heart rate and ischemic phases, more pronounced as by atenolol. For the future ivabradine represents a new possibility for the therapy of coronary heart disease, maybe also of heart failure or specific arrhythmias involving the sinus node.