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European Journal of Cardio-Thoracic Surgery, Vol 11, 732-738, Copyright © 1997 by European Association for Cardio-thoracic Surgery
WK Ng, M Vedder, RM Whitlock, FP Milsom, HD Nisbet, WM Smith, AR Kerr and JK French
OBJECTIVE: To evaluate the long-term outcome of coronary artery bypass
surgery (CABG) in patients < 40 years old and to determine factors
predictive of adverse outcomes. METHODS: Retrospective review of data on
220 patients who underwent isolated CABG at Green Lane Hospital, New
Zealand from 1970 to 1992. RESULTS: The actuarial survival after surgery
was 91, 74 and 50% at 5, 10 and 15 years, respectively. Recurrence of
ischaemic symptoms occurred at a median time of 72 months, and only 20% of
patients remained asymptomatic 10 years after CABG. Univariate analysis of
potentially adverse surgical factors showed that patients who had prolonged
bypass time (> or = 100 min, P < 0.007) had increased late mortality.
There were two distinct operative eras with respect to the use of IMA
conduits (4% pre 1985, 87% post 1984) The relationship between IMA conduits
use and survival was significant on time independent analysis (P <
0.02), but was not using the log-rank test. Preoperative clinical
characteristics associated with increased late mortality were impaired left
ventricular function (end-systolic volume (ESV) > or = 80 ml, P = 0.008;
ejection fraction < 40%, P = 0.0005), and lack of aspirin use either
pre- or post- operatively (P < 0.0001). Multivariate analysis indicated
that reduced ejection fraction (P = 0.04) and prolonged bypass time (P =
0.05) was associated with an increased risk of late death. Aspirin therapy
(P = 0.001) was associated with decreased late mortality. Cumulative events
rate of reintervention and mortality was reduced in female patients (P =
0.0009). At review, 45% of patients had total cholesterol > 6.5 mmol/l.
CONCLUSION: To avoid the early recurrence of symptoms, the need for
reintervention and late mortality, young patients should receive IMA
conduits, cardioplegia as myocardial protection, aspirin and therapy to
modify/ameliorate their risk factors including dyslipidaemia, diabetes and
left ventricular dysfunction.
ARTICLES
Coronary revascularisation in young adults
Department of Cardiology, Green Lane Hospital, Epsom, Auckland, New Zealand.
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