Cardiology

Modelling the Short QT Syndrome Gene Mutations: And Their by Ismail Adeniran

By Ismail Adeniran

The brief QT Syndrome (SQTS) is characterised by way of abbreviated QT durations at the electrocardiogram, elevated threat of cardiac arrhythmias and surprising loss of life. even supposing a number of gene mutations were pointed out in SQT sufferers, the function of those mutations in selling arrhythmogenesis remains to be no longer thoroughly understood. hence, this thesis employs multidisciplinary methods to increase a 3D digital center, that's then used to explain how the fast QT syndrome enables and continues ventricular arrhythmias and to figure out its results on ventricular mechanical contraction. The findings during this thesis offer a complete and mechanistic cause of a couple of gene mutations linked to potassium channels when it comes to susceptibility to arrhythmia. The multiphysics types built supply a robust platform for opting for the foundation motives of varied arrhythmias and investigating healing interventions for those diseases.

The thesis was once tested via Prof. Chris Huang of the college of Cambridge, the main authoritative determine in cardiac electrophysiology, who has defined the paintings as “outstanding.”

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Additional resources for Modelling the Short QT Syndrome Gene Mutations: And Their Role in Cardiac Arrhythmogenesis

Sample text

HERG/ IKr and KCNQ1-KCNE1/IKs pass current preferentially in the outward direction while KCNJ2/IK1 passes current preferentially in the inward direction over the outward direction. 2 The hERG/IKr Potassium Channel The significance of the hERG/IKr channel for normal human cardiac electrical activity was discovered when inherited gene mutations to hERG resulted in long QT syndrome (LQTS) [12–14]; a cardiac repolarization disorder. In the LQTS, patients have a lengthened QT interval on the ECG and become susceptible to the potentially fatal arrhythmia torsades de pointes [15–17].

Of all the K+ channels, it has the highest selectivity for K+ ions [24, 57]. 2 Acetylcholine-Activated K+ Channel (IK,Ach) IK,Ach is highly expressed in the SAN, AVN and atria cells but has low expression in the ventricle [22, 24, 57]. Its activation by acetylcholine results in a weakly inward-rectifying K+ current (inward rectification is weaker than that for IK1) that hyperpolarises the cell and shortens the APD. It is activated when acetylcholine binds to the M2 muscarinic receptor, which is coupled to the K+ channel via the guanine nucleotide binding protein (G protein) [22, 24, 57].

Potentials positive to EK (see red 42 2 Potassium Channels Implicated Fig. 1 channel expressed in HEK cells elicited by the ascending voltage ramp command shown inset. Modified from [93] line in Figs. 9) [86–88, 94–97]. As membrane depolarisation increases further, the outward IK1 current decreases due to its inward rectification. , the SAN [98]. e. membrane potential is more ‘labile’ in the absence of IK1). Consequently, in cardiac cells, IK1 plays a role in stabilizing the resting potential of the cell and in the duration of the action potential [86–88, 94– 97].

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