AnaphylaxisHistamine ReleaseGuinea PigsArrhythmias, CardiacPassive Cutaneous AnaphylaxisArrhythmia, SinusFood HypersensitivityMyocytes, CardiacElectrocardiographyImmunoglobulin EHeartDeath, Sudden, CardiacDrug HypersensitivityCardiac OutputTachycardia, VentricularAnti-Arrhythmia AgentsInsect Bites and StingsVentricular FibrillationSRS-AWheat HypersensitivityCardiac Surgical ProceduresPeanut HypersensitivityMast CellsCardiac Pacing, Artificial