TY - JOUR
T1 - Potassium-channel mutations and cardiac arrhythmias - Diagnosis and therapy
AU - Giudicessi, John R.
AU - Ackerman, Michael J.
N1 - Funding Information:
M. J. Ackerman is supported by the Mayo Clinic Windland Smith Rice Comprehensive Sudden Cardiac Death Program and the National Institutes of Health (R01‑HD42569 and P01‑HL094291). J. R. Giudicessi is supported by a National Heart, Lung, and Blood Institute Kirschstein NRSA Individual Predoctoral MD/PhD Fellowship (F30‑HL106993).
PY - 2012/6
Y1 - 2012/6
N2 - The coordinated generation and propagation of action potentials within cardiomyocytes creates the intrinsic electrical stimuli that are responsible for maintaining the electromechanical pump function of the human heart. The synchronous opening and closing of cardiac Na +, Ca 2+, and K + channels corresponds with the activation and inactivation of inward depolarizing (Na + and Ca 2+) and outward repolarizing (K +) currents that underlie the various phases of the cardiac action potential (resting, depolarization, plateau, and repolarization). Inherited mutations in pore-forming α subunits and accessory βsubunits of cardiac K + channels can perturb the atrial and ventricular action potential and cause various cardiac arrhythmia syndromes, including long QT syndrome, short QT syndrome, Brugada syndrome, and familial atrial fibrillation. In this Review, we summarize the current understanding of the molecular and cellular mechanisms that underlie K +-channel- mediated arrhythmia syndromes. We also describe translational advances that have led to the emerging role of genetic testing and genotype-specific therapy in the diagnosis and clinical management of individuals who harbor pathogenic mutations in genes that encode α or β subunits of cardiac K + channels.
AB - The coordinated generation and propagation of action potentials within cardiomyocytes creates the intrinsic electrical stimuli that are responsible for maintaining the electromechanical pump function of the human heart. The synchronous opening and closing of cardiac Na +, Ca 2+, and K + channels corresponds with the activation and inactivation of inward depolarizing (Na + and Ca 2+) and outward repolarizing (K +) currents that underlie the various phases of the cardiac action potential (resting, depolarization, plateau, and repolarization). Inherited mutations in pore-forming α subunits and accessory βsubunits of cardiac K + channels can perturb the atrial and ventricular action potential and cause various cardiac arrhythmia syndromes, including long QT syndrome, short QT syndrome, Brugada syndrome, and familial atrial fibrillation. In this Review, we summarize the current understanding of the molecular and cellular mechanisms that underlie K +-channel- mediated arrhythmia syndromes. We also describe translational advances that have led to the emerging role of genetic testing and genotype-specific therapy in the diagnosis and clinical management of individuals who harbor pathogenic mutations in genes that encode α or β subunits of cardiac K + channels.
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U2 - 10.1038/nrcardio.2012.3
DO - 10.1038/nrcardio.2012.3
M3 - Review article
C2 - 22290238
AN - SCOPUS:84861481127
SN - 1759-5002
VL - 9
SP - 319
EP - 332
JO - Nature Reviews Cardiology
JF - Nature Reviews Cardiology
IS - 6
ER -