Used primarily as a short-acting beta-1 selective adrenergic blocker in clinical settings, especially during perioperative management. It is effective in rapidly controlling heart rate in patients with tachyarrhythmias, particularly in acute atrial fibrillation or flutter in perioperative or critical care situations. Due to its ultra-short half-life and rapid onset, it allows for precise titration and quick adjustment of effect, making it suitable for use in unstable hemodynamic conditions. Commonly administered intravenously in intensive care units and during cardiac interventions where rapid heart rate control is needed without prolonged effects.