Omar Jamal

Systematic review on noninvasive assessment of subclinical cardiovascular disease in obstructive sleep apnea: new kid on the block!

Patients with obstructive sleep apnea (OSA) have a high burden of cardiovascular disease (CVD) but a causal relationship between OSA and atherosclerotic CVD remains unclear. We systematically reviewed the literature analyzing the relationship. A review of the Medline database for studies noninvasively evaluating subclinical CVD in OSA was conducted. A total of fifty-two studies were included in this review. Across the studies the prevalence of atherosclerosis, as assessed by coronary artery calcification, carotid intima-media thickness, brachial artery flow-mediated dilation and pulse wave velocity was higher in patients with OSA and correlated with increasing severity and duration of OSA. This study shows OSA is an independent predictor of subclinical CVD as CVD is more likely to occur in patients with long standing and severe OSA. Further research is however necessary to identify specific OSA populations that would benefit from aggressive screening.

Subclinical cardiovascular disease in plaque psoriasis: Association or causal link?

BACKGROUND Psoriasis patients have a high prevalence of cardiovascular events and are thought to have a relative risk increase of 25% as compared to the general population. However, a causal relationship between psoriasis and cardiovascular disease has not been established. We sought to perform a systematic review of existing data regarding the presence of endothelial dysfunction and subclinical atherosclerosis in patients with plaque psoriasis. METHODS A systematic literature search was performed, using Medline database and Ovid SP for relevant literature up to November 2012. Twelve studies met inclusion criteria from an initial search result of 529 articles. RESULTS Among the twelve studies meeting inclusion criteria, two (17%) reported increased mean coronary artery calcification (CAC) in psoriatic patients. Six studies (50%) showed carotid intima-media thickness [CIMT] increase in psoriasis. Five studies (42%) examined flow mediated dilation [FMD], of which three showed decreased FMD in psoriasis patients. One study (8%) each demonstrated a decreased coronary flow reserve and increased arterial stiffness as assessed by pulse wave velocity. CONCLUSIONS Patients with psoriasis have an increased burden of subclinical atherosclerosis and endothelial dysfunction. Patients with greater severity and/or disease duration should be targeted for primary screening for cardiovascular disease risk reduction.

Obesity and metabolic phenotypes (metabolically healthy and unhealthy variants) are significantly associated with prevalence of elevated C-reactive protein and hepatic steatosis in a large healthy Brazilian population

Background. Among the obese, the so-called metabolically healthy obese (MHO) phenotype is thought to confer a lower CVD risk as compared to obesity with typical associated metabolic changes. The present study aims to determine the relationship of different subtypes of obesity with inflammatory-cardiometabolic abnormalities. Methods. We evaluated 5,519 healthy, Brazilian subjects (43 ± 10 years, 78% males), free of known cardiovascular disease. Those with <2 metabolic risk factors (MRF) were considered metabolically healthy, and those with BMI ≥ 25 kg/m2 and/or waist circumference meeting NCEP criteria for metabolic syndrome as overweight/obese (OW). High sensitivity C reactive protein (hsCRP) was measured to assess underlying inflammation and hepatic steatosis (HS) was determined via abdominal ultrasound. Results. Overall, 40% of OW individuals were metabolically healthy, and 12% normal-weight had ≥2 MRF. The prevalence of elevated CRP (≥3 mg/dL) and HS in MHO versus normal weight metabolically healthy group was 22% versus 12%, and 40% versus 8% respectively (P < 0.001). Both MHO individuals and metabolically unhealthy normal weight (MUNW) phenotypes were associated with elevated hsCRP and HS. Conclusion. Our study suggests that MHO and MUNW phenotypes may not be benign and physicians should strive to treat individuals in these subgroups to reverse these conditions.

Objective measures of the frailty syndrome (hand grip strength and gait speed) and cardiovascular mortality: A systematic review.

BACKGROUND Handgrip strength (HGS) and gait speed (GS) are objective components of the frailty syndrome in the elderly, and are associated with increased all-cause mortality. However, their association with cardiovascular (CVD) mortality is less lucid. The present systematic review aims to summarize the available literature assessing HGS, GS and their association with CVD Mortality. METHODS Medline and Embase databases were searched systematically using controlled vocabulary and free text terms. A total of 344 results were obtained and scanned for inclusion. Articles were included if they presented results of original research and provided information on HGS or GS and CVD mortality. RESULTS A total of 19 studies (N=63,396) were included for review. Twelve studies examined hand grip strength with CVD mortality and 7 studies assessed gait speed. Almost all included studies demonstrated an association of HGS/GS with CVD mortality on univariate analyses. Decreased HGS or GS were associated with increased mortality in most studies (8/12 for HGS and 6/7 for GS). In most positive studies, the association of HGS/GS was usually found to be independent of traditional CVD risk factors. CONCLUSION The present review demonstrates that decreased HGS and GS are associated with CVD mortality, with the association found to be more consistent for GS as compared to HGS. Both of these measures provide valuable prognostic information above and beyond traditional scoring methods and should be considered for implementation in clinical practice.

Measuring coronary artery calcification: is serum vitamin D relevant?

OBJECTIVES To synthesize evidence of the association between low vitamin D levels and subclinical coronary atherosclerosis measured by coronary artery calcium (CAC). METHODS A systematic MEDLINE search was conducted for relevant published literature. Ten studies (7 cross-sectional, 3 longitudinal) met the inclusion criteria. RESULTS Three of 6 studies showed association with CAC prevalence (CAC >0 or >10). Four of 8 studies found an association with CAC severity. One of two studies reported an association with CAC progression, while the only study that assessed CAC incidence did not find a significant relationship. Several of the studies had small sample sizes, many did not adjust for confounders and the cut-off for low vitamin D was inconsistent. CONCLUSION There is insufficient evidence to support a consistent association between low vitamin D levels and CAC. Further high-quality studies are needed to examine serum 25-OH vitamin D in relation to subclinical coronary atherosclerosis.

Clinical reviewSystematic review on noninvasive assessment of subclinical cardiovascular disease in obstructive sleep apnea: new kid on the block!

Patients with obstructive sleep apnea (OSA) have a high burden of cardiovascular disease (CVD) but a causal relationship between OSA and atherosclerotic CVD remains unclear. We systematically reviewed the literature analyzing the relationship. A review of the Medline database for studies noninvasively evaluating subclinical CVD in OSA was conducted. A total of fifty-two studies were included in this review. Across the studies the prevalence of atherosclerosis, as assessed by coronary artery calcification, carotid intima-media thickness, brachial artery flow-mediated dilation and pulse wave velocity was higher in patients with OSA and correlated with increasing severity and duration of OSA. This study shows OSA is an independent predictor of subclinical CVD as CVD is more likely to occur in patients with long standing and severe OSA. Further research is however necessary to identify specific OSA populations that would benefit from aggressive screening.