TY - JOUR
T1 - Inaccurate electrocardiographic interpretation of long QT
T2 - The majority of physicians cannot recognize a long QT when they see one
AU - Viskin, Sam
AU - Rosovski, Uri
AU - Sands, Andrew J.
AU - Chen, Edmond
AU - Kistler, Peter M.
AU - Kalman, Jonathan M.
AU - Rodriguez Chavez, Laura
AU - Iturralde Torres, Pedro
AU - Cruz, Fernando E.S.
AU - Centurión, Osmar A.
AU - Fujiki, Akira
AU - Maury, Philippe
AU - Chen, Xiaomin
AU - Krahn, Andrew D.
AU - Roithinger, Franz
AU - Zhang, Li
AU - Vincent, G. Michael
AU - Zeltser, David
PY - 2005/6
Y1 - 2005/6
N2 - Background: Physicians in all fields of medicine may encounter patients with long QT syndrome (LQTS). It is important to define the percentage of physicians capable of distinguishing QT intervals that are long from those that are normal because LQTS can be lethal when left untreated. Objectives: The purpose of this study was to define the percentage of physicians in the different disciplines of medicine who can recognize a long QT when they see one. Methods: We presented the ECGs of two patients with LQTS and two healthy females to 902 physicians (25 world-renowned QT experts, 106 arrhythmia specialists, 329 cardiologists, and 442 noncardiologists) from 12 countries. They were asked to measure the QT, calculate the QTc (the QT interval corrected for the heart rate), and determine whether the QT is normal or prolonged. Results: For patients with LQTS, >80% of arrhythmia experts but <50% of cardiologists and <40% of noncardiologists calculated the QTc correctly. Underestimation of the QTc of patients with LQTS and overestimation of the QTc of healthy patients were common. Interobserver agreement was excellent among QT experts, moderate among arrhythmia experts, and low among cardiologists and noncardiologists (kappa coefficient = 0.82, 0.44, and < 0.3, respectively). Correct classification of all QT intervals as either "long" or "normal" was achieved by 96% of QT experts and 62% of arrhythmia experts, but by only <25% of cardiologists and noncardiologists. Conclusions: Most physicians, including many cardiologists, cannot accurately calculate a QTc and cannot correctly identify a long QT.
AB - Background: Physicians in all fields of medicine may encounter patients with long QT syndrome (LQTS). It is important to define the percentage of physicians capable of distinguishing QT intervals that are long from those that are normal because LQTS can be lethal when left untreated. Objectives: The purpose of this study was to define the percentage of physicians in the different disciplines of medicine who can recognize a long QT when they see one. Methods: We presented the ECGs of two patients with LQTS and two healthy females to 902 physicians (25 world-renowned QT experts, 106 arrhythmia specialists, 329 cardiologists, and 442 noncardiologists) from 12 countries. They were asked to measure the QT, calculate the QTc (the QT interval corrected for the heart rate), and determine whether the QT is normal or prolonged. Results: For patients with LQTS, >80% of arrhythmia experts but <50% of cardiologists and <40% of noncardiologists calculated the QTc correctly. Underestimation of the QTc of patients with LQTS and overestimation of the QTc of healthy patients were common. Interobserver agreement was excellent among QT experts, moderate among arrhythmia experts, and low among cardiologists and noncardiologists (kappa coefficient = 0.82, 0.44, and < 0.3, respectively). Correct classification of all QT intervals as either "long" or "normal" was achieved by 96% of QT experts and 62% of arrhythmia experts, but by only <25% of cardiologists and noncardiologists. Conclusions: Most physicians, including many cardiologists, cannot accurately calculate a QTc and cannot correctly identify a long QT.
KW - Electrocardiogram
KW - Long QT
KW - QT interval
UR - http://www.scopus.com/inward/record.url?scp=21144457928&partnerID=8YFLogxK
U2 - 10.1016/j.hrthm.2005.02.011
DO - 10.1016/j.hrthm.2005.02.011
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C2 - 15922261
AN - SCOPUS:21144457928
SN - 1547-5271
VL - 2
SP - 569
EP - 574
JO - Heart Rhythm
JF - Heart Rhythm
IS - 6
ER -