1997
Relation of Ultra-Low Frequency Heart Rate Variability to the Clinical Course of Chronic Aortic Regurgitation
Freed L, Stein K, Borer J, Hochreiter C, Supino P, Devereux R, Roman M, Kligfield P. Relation of Ultra-Low Frequency Heart Rate Variability to the Clinical Course of Chronic Aortic Regurgitation. The American Journal Of Cardiology 1997, 79: 1482-1487. PMID: 9185637, DOI: 10.1016/s0002-9149(97)00175-6.Peer-Reviewed Original ResearchConceptsFrequency heart rate variabilityHeart rate variabilityChronic aortic regurgitationEnd-point eventsAortic regurgitationSymptomatic patientsNew York Heart Association functional class IChronic severe aortic regurgitationLeft ventricular ejection fractionLV end-diastolic dimensionLV end-systolic dimensionMeasures of HRVRate variabilitySevere aortic regurgitationAortic valve replacementEnd-diastolic dimensionCongestive heart failureEnd-systolic dimensionFunctional class IVentricular ejection fractionSudden cardiac deathRegurgitant valvular diseaseClinical outcome eventsMean RR intervalAverage annual risk
1996
Rhythm annotation and interobserver reproducibility of measures of heart rate variability
Kroll D, Freed L, Stein K, Borer J, Kligfield P. Rhythm annotation and interobserver reproducibility of measures of heart rate variability. The American Journal Of Cardiology 1996, 78: 1055-1057. PMID: 8916491, DOI: 10.1016/s0002-9149(96)00537-1.Peer-Reviewed Original Research
1994
Reproducibilfty of power spectral measures of heart rate variability obtained from short-term sampling periods
Freed L, Stein K, Gordon M, Urban M, Kligfield P. Reproducibilfty of power spectral measures of heart rate variability obtained from short-term sampling periods. The American Journal Of Cardiology 1994, 74: 972-973. PMID: 7977138, DOI: 10.1016/0002-9149(94)90604-1.Peer-Reviewed Original Research