Absence of Standard Modifiable Risk Factors in Middle Eastern Patients with Atherosclerotic Cardiovascular Disease. The Jordan Absence of Standard Modifiable Risk Factors (SMuRF-Less) Study.

BACKGROUND

A growing number of individuals develop atherosclerotic cardiovascular disease (ASCVD) despite the absence of the standard modifiable risk factors (hypertension, diabetes, dyslipidemia, and cigarette smoking) (SMuRF-less patients). Prevalence of SMuRF-less patients in the Middle East has not been studied. This study investigates the prevalence, clinical profiles and outcomes of SMuRF-less patients compared with those who have SMuRFs.

METHODS

We analyzed data from 6 published registries and from the Jordan SMuRF-less patients study, including baseline demographic features, cardiovascular risk factors, comorbid diseases, utilization of secondary prevention pharmacotherapy and one year outcome in SMuRF-less patients, those with 1-2 SMuRFs and with 3-4 SMuRFs. Results. A total of f 5540 ASCVD patients were enrolled. Mean age was 57.5 ± 11.6 years, and 1333 (24.1%) were women. Of the whole group, 214 (3.9%) were SMuRF-less, 3014 (54.4%) had 1-2 SMuRFs and 2312 (41.7%) had 3-4 SMuRFs. Compared with the SMuRFs groups, SMuRF-less group were younger, more likely to be men, and had lower prevalence of obesity, physical inactivity, metabolic syndrome, heart failure and chronic kidney disease. SMuRF-less patients were less likely to receive secondary prevention cardiovascular medications (antiplatelet agents, statins, renin angiotensin blockers and beta blockers); all p < 0.001. One year survival in the SMuRF-less patients was significantly lower than that in the SMuRFs groups (97.7% vs.98.4% vs.98.3%, respectively, p = 0.01). Multivariate analysis showed that young age, absence of heart failure and utilization of secondary preventive medications were associated with better one year outcome.

CONCLUSION

In this cohort of ME patients with ASCVD, nearly four in 100 were SMuRF-less. This rate is lower than that reported by most of published studies, mainly due to the high prevalence of the 4 SMuRFs. SMuRF-less patients were younger, had less comorbid disease, received less secondary prevention pharmacotherapy and had higher rate of one year mortality than those with SMuRFs.

CLINICAL TRIALS: The study is registered with ClinicalTrials.gov, unique identifier number NCT06199869.