Background:
Hypertensive patients with obstructive sleep apnea (OSA)
are at a high risk of cardiovascular disease (CVD), but assessments of CVD risk
in this population are frequently constrained by the presence of comorbid medical
conditions. The noninvasive and convenient hepatic steatosis index (HSI) can not
only predict the degree of fatty liver degeneration but also correlates well with
the severity of numerous diseases. However, the relationship between the HSI and
CVD in hypertensive patients with OSA remains unclear.
Methods:
This
retrospective cohort study included patients aged
18 years with
hypertension and a primary diagnosis of OSA and grouped them according to their
baseline HSI. The primary outcome was new or recurrent major adverse
cardiovascular and cerebrovascular events (MACCE), while the secondary outcomes
were cardiac and cerebrovascular events. The relationship between the baseline
HSI and the risk of endpoint events was evaluated using Kaplan–Meier curves,
risk-factor graphs, and Cox regression models, while generalized additive models
were used to identify linear relationships. The C-statistic, integrated
discrimination improvement (IDI), and net reclassification index (NRI) were used
to evaluate the predictive value of HSI increments for endpoint events.
Results:
A total of 2467 participants were included in the analysis and
separated into four groups (Q1–Q4) based on their HSI quartiles. Kaplan–Meier
survival curves indicated that patients in the Q4 group had the lowest survival
time. The Q4 group also showed a significantly higher risk of MACCE (HR [hazard
ratio], 2.95; 95% CI [confidence interva]: 1.99–4.39;
p
0.001),
cardiac events (HR, 2.80; 95% CI: 1.68–4.66;
p
0.001), and
cerebrovascular events (HR, 3.21; 95% CI: 1.71–6.03;
p
0.001). The
dose-response curve revealed a linear association between the HSI and the
occurrence of endpoint events. For every unit increase in the HSI, the risks of
MACCE, cardiac events, and cerebrovascular events increased by 43%, 38%, and
51%, respectively. The C-statistic, IDI, and NRI all indicated that the model
including the HSI showed better discriminatory and classification efficacy for
endpoint events in comparison with the conventional model (
p
0.05).
Conclusions:
The HSI showed a linear relationship with the risk of MACCE
in hypertensive OSA patients.