Dyslipidemia

Background

HIV-infected individuals, both those on antiretroviral therapy (ART) and those who are untreated, appear to have higher rates of coronary heart disease (CHD) than HIV-uninfected individuals and higher rates of various risk factors for CHD, including dyslipidemia. As the average lifespan of patients on effective ART lengthens, and as people living with HIV become older, morbidity and mortality from CHD are likely to continue to increase. Thus, identification and reduction of modifiable risk factors for CHD are important aspects of primary care for HIV-infected patients.

Dyslipidemia is a well-described independent risk factor for CHD, and it occurs in a high proportion of persons with HIV infection. Current research suggests that this dyslipidemia is caused by a combination of factors related to HIV disease, ART regimens, and individual patient characteristics. HIV itself causes lipid perturbations, particularly in persons with more advanced immunosuppression; HIV-infected individuals who are not on antiretroviral (ARV) medications often have elevations in triglyceride (TG) levels and decreases in high-density lipoprotein (HDL) as well as in low-density lipoprotein (LDL) cholesterol and total cholesterol (TC). Lipid abnormalities also may be caused by or compounded by ARVs (see chapter Coronary Heart Disease Risk). They may appear or worsen within a few weeks to months after starting ART. With some patients, this may, at least in part, represent a return to pre-illness lipid levels, whereas the ARVs cause the abnormality in other cases.

Not all ART-treated patients experience lipid abnormalities to the same degree. Patients with a personal or family history of dyslipidemia, glucose intolerance, diabetes, obesity, or a combination of these health problems may be genetically predisposed to lipid abnormalities that become evident once ART is initiated.

The use of potent combination ART, particularly the use of protease inhibitors (PIs), has increased the prevalence of abnormally high TG, TC, and LDL levels among HIV-infected patients. In fact, dyslipidemia has been associated not only with certain PIs but also with certain nonnucleoside reverse transcriptase inhibitors (NNRTIs) and nucleoside reverse transcriptase inhibitors (NRTIs). In the PI class, ritonavir-boosted PIs (though unusually with atazanavir or darunavir) are particularly likely to cause marked elevations of TG and LDL levels. Although NNRTIs also may contribute to increases in TC, LDL, and TG levels the effects, particularly with efavirenz, are more variable (and efavirenz may increase HDL). Of the NRTIs, stavudine, zidovudine, and perhaps abacavir may increase TC and TG levels. To date, available agents from the integrase inhibitor and CCR5 antagonist classes do not appear to have significant adverse impacts on lipid levels.

The largest prospective study of CHD events related to ARVs (the D:A:D study) showed a small but significant increase in the risk of myocardial infarction among HIV-infected patients treated with ARVs; moreover, the effect increased with cumulative years of ARV exposure. This effect was largely but not entirely associated with increases in LDL cholesterol (see chapter Coronary Heart Disease Risk).

Identification and management of dyslipidemia in HIV-infected patients is an important part of HIV primary care. For patients with CHD or CHD risk equivalents (see below), ART regimens should, if possible, be selected to minimize the risk of hyperlipidemia.

Guidelines for the evaluation and management of dyslipidemia have been developed by the National Cholesterol Education Program (NCEP). These recommendations are based on studies of HIV-uninfected persons and may not be entirely applicable to HIV-infected persons, in whom HIV itself may increase risk of CHD events. Despite this limitation, expert panels generally recommend similar treatment goals when evaluating and managing dyslipidemia in patients with HIV infection. (For recommendations on screening, see chapter Initial and Interim Laboratory and Other Tests.)

Note: The American College of Cardiology and the American Heart Association released new guidelines on treatment of hyperlipidemia late in 2013. These take a different approach to many aspects of lipid management, including the evaluation of patients for lipid-lowering therapy, the use and monitoring of lipid lowering agents, and the use of treatment targets. These guidelines have generated controversy. As their appropriateness to the management of HIV-infected individuals is not clear at this time, this chapter will discuss the approach presented in the NCEP guidelines.

S: Subjective

The history should focus on factors that suggest CHD, risk equivalents, or risk factors for CHD. Both CHD risks and CHD equivalents should be the focus of lifestyle modification strategies and lipid-normalizing treatment.

  • CHD includes the following:
    • A history of myocardial infarction
    • Angina
    • CHD procedures
    • Evidence of clinically significant myocardial ischemia
  • CHD risk equivalents are considered to be equal in terms of risk level to known CHD. These include the following:
    • Diabetes mellitus
    • Peripheral vascular disease
    • Symptomatic carotid artery disease
    • Abdominal aortic aneurysm
    • Transient ischemic attacks
    • Two or more CHD risk factors with a 10-year risk of CHD >20% (see "Calculations to Estimate the 10-Year Risk of Cardiac Events for Men and Women," below, or the online risk calculator at cvdrisk.nhlbi.nih.gov/calculator.asp.
  • CHD risk factors are conditions associated with a greater risk of serious cardiac events. These are as follows:
    • Male sex
    • Age (≥45 in men; ≥55 in women)
    • Hypertension
    • Cigarette smoking
    • Low HDL (<40 mg/dL); if >60 mg/dL, subtract one risk factor
    • Family history of premature CHD (first-degree relative aged <55 [men] or <65 [women])
  • Assess for causes of secondary dyslipidemias, including insulin resistance, diabetes, hypothyroidism, obstructive liver diseases, chronic renal failure, and medications such as corticosteroids and progestins.
  • Screen for other factors that contribute to hyperlipidemia, including obesity, chronic liver diseases, alcohol abuse, high-fat or high-carbohydrate diet, and prothrombotic or proinflammatory states.
  • Screen for health behaviors that increase CHD risk, including smoking, high-fat diet, sedentary lifestyle, and use of recreational drugs such as cocaine and methamphetamine.
  • Review the patient's family history for premature CHD (as discussed above), obesity (body mass index [BMI] ≥30), diabetes, and lipid abnormalities.
  • Review the patient's medications, with special attention to ARVs known to increase LDL or TG levels (particularly ritonavir and ritonavir-boosted PIs).

O: Objective

Check vital signs with special attention to blood pressure and weight. Calculate BMI (see chapter Initial Physical Examination for information on BMI).

Perform a focused physical examination with particular attention to signs of hyperlipidemia, such as xanthelasma and xanthoma, and to the cardiovascular system.

A: Assessment

Determine whether a specific intervention is appropriate based on the patient's lipid values and identified CHD risks, as indicated in Tables 1 and 2.

LDL is the main indicator for treatment, and the main target for lipid-lowering therapy. Hypertriglyceridemia is associated with CHD risk, but thresholds of risk have not been defined precisely, and targets for intervention are not entirely clear (for persons with triglyceride levels of ≥500 mg/dL, the triglycerides usually are treated first; see "Treatment," below). Severe hypertriglyceridemia (e.g., TG >1,000 mg/dL) also increases the risk of pancreatitis.

For patients who do not have diabetes or preexisting CHD and who have two or more CHD risk factors, calculate the "10-year risk of cardiovascular events" by using the Risk Assessment Tool for estimating the 10-year risk of a major CHD event. Use the risk-estimate tool at the end of this chapter or the online risk calculator at the National Institutes of Health website.

Table 1. Low-Density Lipoprotein Cholesterol Goals and Thresholds for Treatment*
Risk CategoryLDL Goal*Initiate Therapeutic Lifestyle ChangesConsider Drug Therapy

# This goal (LDL <70 mg/dL) is preferred by many cardiologists for persons with CHD or risk equivalents.

Adapted from Adult Treatment Panel III, National Cholesterol Education Program. Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults. September 2002; NIH publication 02-5215. Accessed December 1, 2013.

Lower risk: No CHD or CHD risk equivalents and <0-1 risk factor<160 mg/dL (<4.1 mmol/L)LDL ≥160 mg/dL (≥4.1 mmol/L)≥190 mg/dL (≥4.9 mmol/L); at 160-189 mg/dL, LDL drug therapy is optional
Moderate risk: No No CHD or CHD risk equivalents and ≥2 risk factors, with 10-year estimated risk <10%<130 mg/dL (<3.4 mmol/L)LDL ≥130 mg/dL (≥3.4 mmol/L)≥160 mg/dL (≥4.1 mmol/L)
Moderately high risk: No CHD or CHD risk equivalents and ≥2 risk factors and 10-year estimated risk 10-20%<130 mg/dL (<3.4 mmol/L) (optional goal of <100 mg/ dL)LDL ≥130 mg/dL (≥3.4 mmol/L)≥130 mg/dL (≥3.4 mmol/L)
High risk: CHD or CHD risk equivalent (see above)<100 mg/dL (<2.6 mmol/L) (optional goal of <70 mg/dL#)LDL ≥100 mg/dL (≥2.6 mmol/L)≥100 mg/dL (≥2.6 mmol/L)
Table 2. Classification of Triglyceride Levels
Risk CategoryTriglyceride MeasurementInitiate therapy

Adapted from Adult Treatment Panel III, National Cholesterol Education Program. Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults. September 2002; NIH publication 02-5215. Accessed December 1, 2013.

Normal triglycerides<150 mg/dL 
Borderline-high triglycerides150-199 mg/dL 
High triglycerides200-499 mg/dLStart therapeutic lifestyle changes; consider medication if CHD, CHD equivalents, or high risk
Very high triglycerides≥500 mg/dLStart therapeutic lifestyle changes; consider medication

P: Plan

Diagnostic Evaluation

The fasting serum lipid panel should be performed at least 8 hours, but ideally 12 hours, after last food and beverage intake. It measures TC, HDL, TG, non-HDL cholesterol with calculated LDL, and TC/HDL cholesterol ratio.

A fasting lipid panel should be checked at baseline, before patients start ART.

Repeat the fasting lipid panel within 3-6 months after ARVs are started, and sooner for patients who have abnormal values at baseline.

Patients with normal lipid values should be rechecked annually (sooner if ARVs are changed). Those with dyslipidemia may need more intensive monitoring (e.g., every 4-6 weeks) until the LDL goal is met, after which monitoring every 4-6 months is adequate.

Treatment

Treatment of dyslipidemia usually involves a multimodal approach, including diet and exercise in all cases, lipid-modifying medication, and consideration of changes in ARV medication. The primary goal of lipid-lowering therapy is to reduce LDL to target levels. For persons with CHD and CHD risk equivalents, the type and intensity of LDL lowering therapies are adjusted according to LDL baseline levels. Note that other interventions to reduce CHD risk also should be undertaken (e.g., smoking cessation if appropriate).

For patients with serum TG level of >400 mg/dL, the LDL cholesterol calculation is unreliable. In this situation, non-HDL cholesterol (TC minus HDL) can be used as a surrogate target of therapy; the non-HDL goal is 30 mg/dL higher than the LDL goal. For these individuals, dietary intervention is warranted, and drug therapy to decrease LDL (or non-HDL) can be considered if TC is >240 mg/dL or HDL cholesterol is <35 mg/dL. For those with TG levels of 200-500 mg/dL, achieving the LDL cholesterol target is the primary goal, and lowering non-HDL cholesterol levels is a secondary goal (see Table 1 for LDL intervention levels).

The NCEP guidelines recommend that very high TG levels (≥500 ml/dL) be reduced before LDL is treated directly (see "Treatment of hypertriglyceridemia," below).

The LDL levels at which either therapeutic lifestyle change (TLC) or drug therapy should be initiated are shown in Table 1, along with the target goals for LDL cholesterol. The response to therapy should be monitored and therapeutic interventions should be intensified or augmented until lipid targets are met.

Therapeutic lifestyle change

TLC, consisting of diet modification and exercise, is fundamental to the management of dyslipidemia for HIV-infected patients.

Target goals for lipid abnormalities are difficult to achieve without prioritizing these behavioral change efforts. Although TLC is hard to maintain, it can yield significant results in reducing CHD risk and improving quality of life. Effective TLC is best achieved with a multidisciplinary team approach. HIV primary care providers should be instrumental in identifying TLC as a treatment priority and providing referrals to nutritionists for dietary counseling, to mental health professionals for assessment of treatable mood disorders, and to social workers, peer counselors, or clinical nurse specialists for assistance with health-behavior changes, self-care strategies, and identification of resources in the community for smoking cessation support and exercise programs. Specific recommendations for TLC goals and behavior change strategies are contained in the Adult Treatment Panel guidelines, which are available at www.nhlbi.nih.gov/guidelines/cholesterol/index.htm.

Pharmacologic treatment for hypercholesterolemia

All patients with elevated lipid levels should initiate TLC. If pharmacologic intervention is indicated, statins (hydroxymethylglutaryl coenzyme A [HMG-CoA] reductase inhibitors) are the first-line treatment for most patients. These agents can be effective in reducing TC, LDL, and non-HDL cholesterol levels in HIV-infected patients (see Table 3). More importantly, they have been shown to reduce the risk of cardiovascular events in persons with or at risk of CHD.

Recommended starting dosages of statins for patients taking PIs are as follows (Note: see "Potential ARV Interactions," below):

  • Pravastatin: 20 mg PO QD
  • Atorvastatin: 10 mg PO QD

Fibrates may be considered as an alternative or adjunct to statins (see "Treatment of hypertriglyceridemia," below, for further information). When given concomitantly, statins and fibrates increase the risk of rhabdomyolysis and must be used cautiously and with careful monitoring). Niacin may be effective as adjunctive therapy, but it has not been shown to decrease CHD events. It may worsen insulin resistance and may cause hepatotoxicity. It also causes uncomfortable flushing in some patients; the sustained-release formulations are better tolerated. Ezetimibe (Zetia) appears to be effective in combination with statins for patients whose cholesterol is not controlled adequately with a statin alone, but it also has not been shown to decrease CHD events. Bile acid sequestrants generally should be avoided because they may interfere with the absorption of other drugs and may increase TG levels.

Table 3. Drug Treatments for Lipid Abnormalities
Lipid AbnormalityFirst ChoiceSecond ChoiceComments

* May have significant interactions with certain ARVs; see Table 4.

Isolated high LDL, non-HDL cholesterolStatinFibrateStart with pravastatin* or atorvastatin* (available as generics). Use low statin dosages and titrate upward; patients taking PIs have increased risk of myopathy.
Isolated high TGFibrateStatin, N-3 (omega-3) fatty acidsStart with gemfibrozil or fenofibrate. Combined statin and fibrate may increase myopathy risk.
High LDL and TG (TG level 200-500 mg/dL)StatinFibrateStart with pravastatin or atorvastatin* (available as generics). Use fluvastatin,* rosuvastatin,* pitavastatin,* gemfibrozil, or fenofibrate as alternatives. Combined statin and fibrate may increase myopathy risk.
High LDL and TG (TG level >500 mg/dL)FibrateN-3 (omega-3) fatty acids, niacin, statinStart with gemfibrozil or fenofibrate. Niacin is associated with insulin resistance. May need to add statin if cholesterol is not controlled adequately.

Potential ARV Interactions

Clinicians should note that there are clinically significant drug interactions between most statins and PIs, NNRTIs, and the pharmacokinetic enhancer cobicistat (see Table 4). PIs and cobicistat can increase serum levels of most statins significantly, thus increasing the risk of severe statin adverse events such as rhabdomyolysis. Of the statin drugs, pravastatin is the least affected by most PIs (darunavir is an exception) and is the recommended statin for most patients with hypercholesterolemia without hypertriglyceridemia. Atorvastatin, if used, should be initiated at low dosage (10 mg) and titrated slowly upward to achieve target lipid levels (note that atorvastatin may lower TG, TC, and LDL levels). Lovastatin and simvastatin are contraindicated for use by patients taking PIs or cobicistat. These can result in severe statin-related adverse events if prescribed. Other available statins include rosuvastatin, pitavastatin, and fluvastatin. These have not been as well studied but may be used with most PIs (there are exceptions; see table on the following page). When statins are given concurrently with interacting PIs, the statins should be started at low dosage and increased incrementally, if indicated; in general, maximum dosages should not be used.

NNRTIs decrease levels of most statins (however, etravirine increases fluvastatin levels); higher dosages of statins may be needed to overcome this interaction. Be aware that various formulations and combination products contain these statins; check the generic name of components in new or unfamiliar cardiac prescriptions to determine whether they contain lipid-lowering agents.

The integrase inhibitors dolutegravir and raltegravir, and other classes of ARV drugs (NRTI, fusion inhibitor, CCR5 antagonist), do not have recognized interactions with statins. Other types of lipid-lowering medications generally are not metabolized by hepatic cytochrome P450 and are not affected by ARVs (an exception to this is gemfibrozil, whose levels are decreased by lopinavir/ritonavir, by an unknown mechanism).

Table 4. Interactions Between Statin Agents and Antiretroviral Medications
Codes✓ Generally safe to begin treatment with usual starting dosage! Caution; start with low dosage, monitor effects✖ Coadministration is contraindicated
 AtorvastatinFluvastatinLovastatinPitavastatinPravastatinRosuvastatin*Simvastatin

^Nevirapine in combination with statins has not been well studied; its interactions would be expected to be similar to those of efavirenz. Delavirdine's interactions would be expected to be similar to those of PIs.

*Other risk factors for elevated rosuvastatin levels include Asian or Pacific Islander heritage, renal insufficiency, and concurrent treatment with gemfibrozil; use with extra caution.

Adapted from: Coffey S. Interactions between ARVs and Statin Medications: Recommendations for Coadministration of PIs and NNRTIs with Statins. San Francisco: HIV InSite; Updated October 2012. Accessed December 1, 2013.

Protease Inhibitors
Atazanavir!No data✓ (unboosted)
! (ritonavir boosted)
!! Rosuvastatin AUC ↑ 213%; Cmax ↑ 600%
Darunavir/ ritonavir!No data! Pravastatin AUC ↑ 81% to 500%!
Fosamprenavir!No dataNo data✓ May need to ↑ pravastatin dosage
Indinavir!No data!!
Lopinavir/ ritonavir! Atorvastatin AUC ↑ 488%No data✓ pravastatin AUC ↑ 33%! Rosuvastatin AUC ↑108%; Cmax ↑ 466%
Nelfinavir!No dataNo data!No data
Ritonavir!No dataNo data!No data
Saquinavir!No dataNo data✓ saquinavir + ritonavir: May need to ↑ pravastatin dosageNo data
Tipranavir✖ Atorvastatin AUC ↑ 836%No dataNo data!✓ Rosuvast AUC ↑ 26%
Nonnucleoside Reverse Transcriptase Inhibitors
Efavirenz^✓ May need to ↑ atorvastatin dosageNo data✓ May need to ↑ lovastatin dosageNo data✓ May need to ↑ pravastatin dosageNo data✓ May need to ↑ simvastatin dosage
Etravirine✓ May need to ↑ atorvastatin dosageNo data; May ↑ fluvastatin levels✓ May need to ↑ lovastatin dosageNo dataNo data✓ May need to ↑ simvastatin dosage
RilpivirineNo dataNo dataNo dataNo dataNo dataNo data
Integrase Inhibitor/Cobicistat Combination
Elvitegravir/cobicistat!No dataNo dataNo data✓ Rosuvast AUC ↑ 38%

Treatment of hypertriglyceridemia

Patients with TG levels of 200-500 mg/dL should begin non-drug interventions such as diet modification, reduction in alcohol consumption, aerobic exercise, and smoking cessation. When the TG level is ≥500 mg/dL, a low-fat diet (<15% of caloric intake) is recommended to help prevent pancreatitis, and pharmacologic therapy probably will be required. Patients with CHD or CHD equivalents, those at high risk of CHD, and those with TG levels >200 mg/dL may need pharmacologic therapy.

Fibrates are the first-line drug option for isolated hypertriglyceridemia and are an alternative treatment for combined hypertriglyceridemia and hypercholesterolemia. Fenofibrate or gemfibrozil reduce TG levels effectively in patients on ARVs. Because they are not metabolized by the cytochrome P450 hepatic enzyme system, they do not have significant drug interactions with most ARVs (an exception may be gemfibrozil with dolutegravir: dolutegravir levels may be increased). Fibrates are contraindicated for use by patients with renal failure. Recommended dosages of these agents are as follows:

  • Fenofibrate: 40-200 mg PO QD
  • Gemfibrozil: 600 mg PO BID, 30 minutes before meals

If a fibrate alone is inadequate in reducing TG levels, several options are possible. A statin (e.g., atorvastatin, which acts on TGs as well as cholesterol) could be added cautiously, although there is an increased risk of skeletal muscle toxicity with concomitant use of a fibrate and a statin. N-3 (omega-3) fatty acid supplements (e.g., fish oils), administered at 1-2 g BID or TID, have decreased TG levels in patients taking ART. Extended-release niacin at 1,500-2,000 mg/day also decreases both TG and TC levels, although its clinical utility is restricted because of associated insulin resistance and flushing.

Switching antiretroviral therapy

For patients with CHD or CHD equivalents, ARV medications should, if possible, be selected to minimize the risk of hyperlipidemia. In patients with dyslipidemia caused by ARV agents, data suggest that it may be beneficial to discontinue ARVs known to increase lipids if reasonable alternatives exist. Substituting atazanavir or an integrase inhibitor in place of a lipogenic PI or replacing stavudine with tenofovir may improve the lipid profile. Before making ARV substitutions, however, consider carefully the possible effect of the substitution on HIV virologic control and the potential adverse effects of new ARVs. In some cases, antihyperlipidemic agents may be necessary even after ARV substitution.

Appendix

Calculations to Estimate the 10-Year Risk of Cardiac Events for Men and Women -- Framingham Calculator

To calculate the 10-year risk of cardiac events, add up points from the following five tables pertaining to age, HDL, systolic blood pressure, TC, and smoking status (Tables 5.1-5.5). Note that in Tables 5.3-5.5, women's points are in parentheses. After adding points from all of the tables, consult Table 5.6. (Alternatively, an online calculator is available.)

(The Framingham Heart Study risk calculator has not been validated for HIV-infected individuals and may underestimate the risk in this population.)

Table 5.1. Estimate of 10-Year Risk of Cardiac Events: Age
Age (Year)Points (Men)Points (Women)
20-34-9-7
35-39-4-3
40-4400
45-4933
50-5466
55-5988
60-641010
65-691112
70-741214
75-791316
Table 5.2. Estimate of 10-Year Risk of Cardiac Events: High-Density Lipoprotein Cholesterol
HDL (mg/dL)Points (Men)Points (Women)
≥60-1-1
50-5900
40-4911
<4022
Table 5.3. Estimate of 10-Year Risk of Cardiac Events: Systolic Blood Pressure
Systolic Blood PressurePoints if Untreated -- Men (Women)Points if Treated -- Men (Women)
<1200 (0)0 (0)
120-1290 (1)1 (3)
130-1391 (2)2 (4)
140-1591 (3)2 (5)
≥1602 (4)3 (6)
Table 5.4. Estimate of 10-Year Risk of Cardiac Events: Total Cholesterol
 Points for Men (Women)
Total Cholesterol (mg/dL)Age 20-39Age 40-49Age 50-59Age 60-69Age 70-79
<1600 (0)0 (0)0 (0)0 (0)0 (0)
160-1994 (4)3 (3)2 (2)1 (1)0 (1)
200-2397 (8)5 (6)3 (4)1 (2)0 (1)
240-2799 (11)6 (8)4 (5)2 (3)1 (2)
≥28011 (13)8 (10)5 (7)3 (4)1 (2)
Table 5.5. Estimate of 10-Year Risk of Cardiac Events: Smoking Status
Smoking StatusPoints for Men (Women)
 Age 20-39Age 40-49Age 50-59Age 60-69Age 70-79
Nonsmoker0 (0)0 (0)0 (0)0 (0)0 (0)
Smoker8 (9)5 (7)3 (4)1 (2)1 (1)
Table 5.6. Estimate of 10-Year Risk of Cardiac Events: Calculating Risk
MenWomen
Point Total10-Year Risk (%)Point Total10-Year Risk (%)
<0<1<9<1
0191
11101
21111
31121
41132
52142
62153
73164
84175
95186
106198
1182011
12102114
13122217
14162322
15202427
1625≥25≥30
≥17≥30  

Patient Education

  • Review the importance of reducing cardiovascular risk factors. This is of increasing importance for all patients with HIV infection, particularly as they age.
  • Educate patients about the benefits of diet and exercise in improving lipid levels and reducing cardiovascular risk.
  • If lipid-lowering medications are prescribed, advise patients on possible adverse effects, and advise them to contact their health care provider if these develop.
  • Advise patients to talk with their health care provider before starting any new medications so they can be evaluated for possible drug-drug interactions.

References

  • Chow D, Day L, Souza S, et al. Metabolic Complications of HIV Therapy. In: Coffey S, Volberding PA, eds. HIV InSite Knowledge Base [online textbook]. San Francisco: UCSF Center for HIV Information; May 2006. Accessed December 1, 2013.
  • Dube MP, Stein JH, Aberg JA, et al. Guidelines for the evaluation and management of dyslipidemia in human immunodeficiency virus (HIV)-infected adults receiving antiretroviral therapy: recommendations of the HIV Medical Association of the Infectious Disease Society of America and the Adult AIDS Clinical Trials Group. Clin Infect Dis. 2003 Sep 1;37(5):613-27.
  • Expert Panel on Detection Evaluation and Treatment of High Blood Cholesterol in Adults. Executive summary of the third report of the National Cholesterol Education Program (NCEP) Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults (Adult Treatment Panel III). JAMA. 2001 May 16;285(19):2486-97.
  • Friis-Møller N, Weber R, Reiss P, et al.; DAD study group. Cardiovascular disease risk factors in HIV patients - association with antiretroviral therapy. Results from the DAD study. AIDS. 2003 May 23;17(8):1179-93.
  • Grundy SM, Cleeman JI, Merz CN, et al. Implications of recent clinical trials for the National Cholesterol Education Program Adult Treatment Panel III guidelines. Circulation. 2004 Jul 13;110(2):227-39.
  • Ho JE, Hsue PY. Cardiovascular manifestations of HIV. Heart. 2009 Jul;95(14):1193-202.
  • McNicholl I. Database of Antiretroviral Drug Interactions. HIV InSite. San Francisco: UCSF Center for HIV Information. Accessed December 1, 2013.
  • Riddler SA, Smit E, Cole SR, et al. Impact of HIV infection and HAART on serum lipids in men. JAMA. 2003 Jun 11;289(22):2978-82.
  • Schambelan M, Benson CA, Carr A, et al. Management of metabolic complications associated with antiretroviral therapy for HIV-1 infection: recommendations of an International AIDS Society-USA panel. J Acquir Immune Defic Syndr. 2002 Nov 1;31(3):257-75.
  • Shor-Posner G, Basit A, Lu Y. Hypocholesterolemia is associated with immune dysfunction in early human immunodeficiency virus-1 infection. Am J Med. 1993 May;94(5):515-9.
  • Stone NJ, Robinson J, Lichtenstein AH, et al. 2013 ACC/AHA Guideline on the Treatment of Blood Cholesterol to Reduce Atherosclerotic Cardiovascular Risk in Adults: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol. 2013 Nov 7.

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Abbreviations for Dosing Terminology

BID
twice daily
BIW
twice weekly
IM
intramuscular (injection), intramuscularly
IV
intravenous (injection), intravenously
PO
oral, orally
Q2H, Q4H, etc.
every 2 hours, every 4 hours, etc.
QAM
every morning
QD
once daily
QH
every hour
QHS
every night at bedtime
QID
four times daily
QOD
every other day
QPM
every evening
TID
three times daily
TIW
three times weekly