Cardiac Complexes, PrematureElectrocardiographyCranial SinusesMaxillary SinusParanasal SinusesSinus of ValsalvaCavernous SinusCarotid SinusFrontal SinusParanasal Sinus DiseasesSphenoid SinusCoronary SinusSinus Thrombosis, IntracranialSick Sinus SyndromeEthmoid SinusParanasal Sinus NeoplasmsTachycardia, SinusHeart RateMaxillary Sinus NeoplasmsPilonidal SinusTransverse SinusesSinoatrial NodeSuperior Sagittal SinusCardiac Pacing, ArtificialAtrial FibrillationBradycardiaSinus Arrest, CardiacCerebral VeinsDogsHeart AtriaArrhythmias, CardiacBlood PressureCiliaVentricular Premature ComplexesPacemaker, ArtificialTachycardia