This is longitudinal data on an observational study on detecting effects of different heart valves, differing on type of tissue, implanted in the aortic position. The data consists of longitudinal measurements on three different heart function outcomes, after surgery occurred. There are several baseline covariates available, and also survival data.
data(heart.valve)This is a data frame in the unbalanced format, that is, with one row per observation. The data consists in columns for patient identification, time of measurements, longitudinal multiple longitudinal measurements, baseline covariates, and survival data. The column names are identified as follows:
numnumber for patient identification.
sexgender of patient (0 = Male and 1 =
Female).
ageage of patient at day of surgery (years).
timeobserved time point, with surgery date as the time origin (years).
fuyrsmaximum follow up time, with surgery date as the time origin (years).
statuscensoring indicator (1 = died and 0 =
lost at follow up).
gradvalve gradient at follow-up visit.
log.gradnatural log transformation of grad.
lvmileft ventricular mass index (standardised) at follow-up visit.
log.lvminatural log transformation of lvmi.
efejection fraction at follow-up visit.
bsapreoperative body surface area.
lvhpreoperative left ventricular hypertrophy.
prenyhapreoperative New York Heart Association (NYHA)
classification (1 = I/II and 3 = III/IV).
redoprevious cardiac surgery.
sizesize of the valve (millimeters).
con.cabgconcomitant coronary artery bypass graft.
creatpreoperative serum creatinine (\(\mu\)mol/mL).
dmpreoperative diabetes.
aceipreoperative use of ace inhibitor.
lvpreoperative left ventricular ejection fraction (LVEF)
(1 = good, 2 = moderate, and 3 = poor).
emergencoperative urgency (0 = elective, 1 =
urgent, and 3 = emergency).
hcpreoperative high cholesterol (0 = absent, 1
= present treated, and 2 = present untreated).
sten.reg.mixaortic valve haemodynamics (1 = stenosis,
2 = regurgitation, 3 = mixed).
hsimplanted aortic prosthesis type (1 = homograft
and 0 = stentless porcine tissue).
Lim E, Ali A, Theodorou P, Sousa I, Ashrafian H, Chamageorgakis T, Duncan M, Diggle P, Pepper J. A longitudinal study of the profile and predictors of left ventricular mass regression after stentless aortic valve replacement. Ann Thorac Surg. 2008; 85(6): 2026-2029.
mental, liver, epileptic,
aids.