A hyper-realistic cinematic medical animation of a human heart violently fluttering and beating irregularly inside a dark human chest cavity, glowing red electrical impulses firing chaotically across the heart muscles, visible rapid atrial fibrillation motion, dramatic pulsing veins, intense heartbeat vibrations, ultra detailed anatomy, emergency medical atmosphere, cinematic lighting, shallow depth of field, realistic blood flow, slow-motion heart spasms, subtle ECG waveform holograms floating around, dark blue and red color palette, tension-filled mood, high contrast shadows, ultra HD, 8K, Hollywood medical documentary style, dynamic camera movement, dramatic zoom-ins on the fluttering heart tissue, realistic internal body environment, highly detailed textures, suspenseful and alarming visual tone.