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Eur Heart J. 2010 Dec;31(23):2897-908. doi: 10.1093/eurheartj/ehq328. Epub 2010 Sep 16.

J-curve revisited: An analysis of blood pressure and cardiovascular events in the Treating to New Targets (TNT) Trial.

Author information

1
New York University School of Medicine, New York, NY, USA.

Abstract

AIM:

In patients with coronary artery disease (CAD), a J-curve relationship has been reported between blood pressure (BP) and future cardiovascular events. However, this is controversial. The purpose of the study was to determine the relationship between on-treatment BP and cardiovascular outcomes in patients with CAD.

METHODS AND RESULTS:

We evaluated 10 001 patients with CAD and a low-density lipoprotein (LDL) cholesterol level <130 mg/dL, randomized to atorvastatin 80 vs. 10 mg, enrolled in the TNT trial. The post-baseline, time-dependent BPs [systolic blood pressure (SBP) and diastolic blood pressure (DBP)] were categorized into 10 mmHg increments. The primary outcome was a composite of death from coronary disease, non-fatal myocardial infarction (MI), resuscitated cardiac arrest, and fatal or non-fatal stroke. Among the 10 001 patients, 982 (9.82%) experienced a primary outcome at 4.9 years (median) of follow-up. The relationship between SBP or DBP and primary outcome followed a J-curve with increased event rates above and below the reference BP range, both unadjusted and adjusted (for baseline covariates, treatment effect, and LDL levels). A time-dependent, non-linear, multivariate Cox proportional hazard model identified a nadir of 146.3/81.4 mmHg where the event rate was lowest. A similar non-linear relationship with a higher risk of events at lower pressures was found for most of the secondary outcomes of all-cause mortality, cardiovascular mortality, non-fatal MI, or angina. However, for the outcome of stroke, lower was better for SBP.

CONCLUSION:

In patients with CAD, a low BP (<110-120/<60-70 mmHg) portends an increased risk of future cardiovascular events (except stroke).

PMID:
20846991
DOI:
10.1093/eurheartj/ehq328
[Indexed for MEDLINE]

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