2001 OPEN FORUM Abstracts
WHAT IS THEPOTENTIAL FOR SUDDEN CARDIAC DEATH DUE TO LONG Q-T SYNDROME IN INTERCOLLEGIATEATHLETES?
Johnson TJ,Hill-Lombardi V, Kitsos J, Jean B, Joseph J, Nora R, Santos C, Tam M.
Research Question: What isthe prevalence of Long Q-T Syndrome in athletes who play intercollegiate sports?Is screening necessary? Can a simple six-lead EKG be used to identify personsat risk?
Methods & Materials: Athletictrainers and coaches recruited volunteers from male and female inter-collegiateathletes who play basketball, soccer and track. Volunteers were screened andexclusion criteria included a diagnosed history of heart disease, a family historyof EKG abnormalities, and the use of medication that could prolong the Q-T interval.Twelve athletes (5 male and 7 female) participated. Informed, signed consentwas obtained prior to any testing. A resting six lead EKG (KoKo Rhythm, PulmonaryData Services, Louisville, CO), blood pressure by spygomanometer and pulse wastaken prior to a workout. The KoKo Rhythm software read and corrected the Q-Tinterval for heart rate.
Results: Twelve intercollegiateathletes met the inclusion criteria and signed informed consent. The averageage was 19 y/o (range 18 ?21) with an average height of 67.4 inches (the averagemale was 70 inches while the average female was 66 inches) and weight of 150lbs. (the average male was 32 lbs. heavier than his female counterpart). Therewere no significant diferences in tympanic body temperature (96.3oF),blood pressure (116/72 male vs. 116/69.4 female) or resting heart rate (71.2male vs. 72.7 female) among the participants. Corrected QT intervals (QTc) forheart rate averaged 404 msec with a mean QTc of 414 (range 352 ? 468 msec).QTc for male athletes averaged 395.2 msec and a mean QTc of 408 msec. with arange of QTc of 352 to 414 msec (25.56 SD). Female intercollegiate athleteshad an average QTc of 410.7 msec and a mean QTc of 404 msec with a range of386 to 468 msec (27.20 SD). Of the athletes studied four of the twelve (33.33%)hadQ-T intervals above the upper limits of normal. One male had a Q-T intervalgreater than the upper limit of normal 404 msec for the heart rate of 67 (410msec). Meanwhile three female athletes were identified as having QTc?s of 386msec 399 msec, and 468 msec (Upper Limit of Normal for these females were: 372msec, 423, and 464 msec respectively). There were no significant differencesin age, blood pressure or heart rate among the athletes.
Conclusions: Although ourdata suggests that a potentially significant number of intercollegiate athletesmay have an increased, i.e. above the upper limit of normal, Q ? T intervalmore research is required.