Insights into Causal Cardiovascular Risk Factors from Mendelian Randomization.
Level 5 - mechanism / opinion, no new human data
Narrative review summarizing Mendelian randomization literature with no systematic review methodology
PubMed 36640254 · doi:10.1007/s11886-022-01829-8
What was done
This narrative review summarizes findings from Mendelian randomization (MR) studies evaluating causal risk factors for cardiovascular disease (CVD), contextualized within the methodology's strengths and limitations.
What was found
The abstract reports no numerical estimates or confidence intervals. It notes that MR studies have confirmed causal roles for smoking, adiposity, blood pressure (confirming the role of diastolic blood pressure), type 2 diabetes, lipids, and potentially inflammation. Specific insights highlighted include that alcohol's association with CVD is likely linear, apolipoprotein B is the primary target lipid, and MR findings foreshadowed anti-inflammatory clinical trial results. MR has been less successful in establishing causal roles for diet and early-life influences such as birth weight.
Why it matters
Mendelian randomization leverages genetic variants as instrumental variables to obtain unconfounded causal estimates, helping prioritize therapeutic targets and prevent unpromising intervention trials.
Limits
As a narrative review, no systematic search strategy or study counts are provided. The abstract lacks numerical effect sizes. MR itself is constrained by instrumental variable assumptions and a lack of global ancestral diversity in genetic datasets.
Cited by
- supports ApoB, insulin resistance, hypertension, and smoking are the four primary causal drivers of atherosclerotic cardiovascular disease.