Conclusions Study -level data from this systemic review establish that different lipid lowering agents can lead to discordance between LDL-P and LDL-C , therefore , basing LDL-lowering therapy only on the achievement of cholesterol goals may result in a treatment gap .
Therefore , the use of LDL-P for monitoring lipid-lowering therapy , particularly for statins , can provide a more accurate assessment of residual cardiovascular risk
Purpose This systematic review was performed to summarize published experience using low density lipoprotein particle number ( LDL-P ) to monitor the efficacy of  lipid-lowering pharmacotherapies .
Effect of niacin and atorvastatin on lipoprotein subclasses in patients with atherogenic dyslipidemia.
This study was conducted to determine the efficacy of atorvastatin and niacin on lipoprotein subfractions in patients with atherogenic dyslipidemia . This was a multicenter , r and omized , open-label , parallel- design study of patients with total cholesterol > 200 mg/dl , triglycerides between 200 and 800 mg/dl , and apolipoprotein B > 110 mg/dl . Patients were r and omly assigned to atorvastatin 10 mg or immediate release niacin 3,000 mg daily for 12 weeks following a low-fat diet stabilization period . Lipoprotein subclasses were measured by nuclear magnetic resonance spectroscopy . Atorvastatin and niacin both significantly reduced the concentrations of very low-density lipoprotein ( VLDL ) particles ( -31 % and -29 % , respectively ) and small low-density lipoprotein ( LDL ) particles ( -44 % and -35 % , respectively ) . Niacin increased the concentration of large LDL ( + 75 % ) . Atrovastatin reduced the number of LDL particles more than niacin ( 31 % vs 14 % ) . In patients with atherogenic dyslipidemia , both drugs had important effects on lipoprotein subfractions , which contributed to a reduction in coronary heart disease risk . The drugs equally reduced VLDL subclass levels . Niacin shifted the LDL subclass distribution toward the larger particles , more effectively converted patients from LDL phenotype B to phenotype A , and increased levels of the larger and perhaps more cardioprotective high-density lipoprotein particles . In contrast , atorvastatin preferentially lowered the concentration of small LDL particles without increasing levels of large LDL , and more effectively , reduced LDL particle numbers .  Atorvastatin had a preferred LDL effect , whereas niacin had a preferred high-density lipoprotein effect
Conclusions Study -level data from this systemic review establish that different lipid lowering agents can lead to discordance between LDL-P and LDL-C , therefore , basing LDL-lowering therapy only on the achievement of cholesterol goals may result in a treatment gap .
Therefore , the use of LDL-P for monitoring lipid-lowering therapy , particularly for statins , can provide a more accurate assessment of residual cardiovascular risk
Purpose This systematic review was performed to summarize published experience using low density lipoprotein particle number ( LDL-P ) to monitor the efficacy of  lipid-lowering pharmacotherapies .