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6 Possible Causes for Lack of Atrial Excitability

  • Atrial Standstill

    […] of atrial excitability; absence of atrial wall movement at fluoroscopy; no mitral A wave on the echocardiogram.[ncbi.nlm.nih.gov] Electrocardiographic findings include bradycardia, ectopic supraventricular rhythms, lack of atrial excitability and absent P waves.[orpha.net] Electrocardiographic findings include bradycardia, ectopic supraventricular rhythms, lack of atrial excitability and absent P waves. ( Orphanet Rare Disease Ontology , Orphanet[amp.pharm.mssm.edu]

  • Atrial Arrhythmia

    Adult mice lacking DCT displayed normal cardiac development but an increased susceptibility to atrial arrhythmias.[ncbi.nlm.nih.gov] Cultured primary cardiac melanocyte-like cells were excitable, and those lacking DCT displayed prolonged repolarization with early afterdepolarizations.[ncbi.nlm.nih.gov] Furthermore, mice with mutations in the tyrosine kinase receptor Kit lacked cardiac melanocyte-like cells and did not develop atrial arrhythmias in the absence of DCT.[ncbi.nlm.nih.gov]

  • Hypothyroidism

    Thyroid hormones have known effects on heart rate and cardiac excitability.[doi.org] In contrast to the increased risk of atrial fibrillation in patients with excess thyroid hormones [ 27 ], evidence on this association in individuals with subclinical hypothyroidism[web.archive.org] Adequately powered RCTs examining a potential reduction of cardiovascular events through restoration of euthyroidism are lacking.[doi.org]

  • Sick Sinus Syndrome

    Uncommon AVNRT was confirmed by the lack of atrial pre-excitation during PSVT and para-Hisian pacing.[ncbi.nlm.nih.gov]

  • Wolff-Parkinson-White Syndrome

    Phases of Cardiac Activation PHASE 1 • Atrial activation- normal PHASE 2 • Ventricular pre-excitation • sinus activation occurs through both normal, anomalous pathway • anomalous[slideshare.net] […] pathway lacks AV nodal conduction delay • so sinus impulse conducted at a rapid rate • this enables ventricles to be activated or pre exited- short PR interval, delta wave[slideshare.net]

  • Emery-Dreifuss Muscular Dystrophy Type 1

    Due to lack of excitability of the atrial myocardium, we changed the primary device type that had been planned for implantation.[ojs.kardiologiapolska.pl] Lack of excitability was consistent in all of the tested places in the right atrial endocardium and veins leading to the coronary sinus; it also did not depend on the scale[ojs.kardiologiapolska.pl] Delay (190 ms for pacing rhythm 100 imp/min) between pacing spike and atrial excitation A 35-year-old patient (DG, no. 17) received a pacemaker due to bradycardia (38/min[ojs.kardiologiapolska.pl]

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