Devaki Nair

British HIV Association guidelines for the treatment of HIV-1-infected adults with antiretroviral therapy 2008

This summary document is an update to the full British HIV Association (BHIVA) Treatment Guidelines published in HIV Medicine in July 2005 (Volume 6, Supplement 2). Only the ‘What to start with’ and ‘Treatment-experienced patients’ sections have been completely rewritten. The tables of recommendations (Tables 1–7) have also been updated to include new data. Please refer to the full guidelines for more information.

Tenofovir‐associated renal and bone toxicity

Objectives The aims of the study were to describe the clinical presentation and renal and bone abnormalities in a case series of HIV‐infected patients receiving treatment with tenofovir (TDF), and to recommend appropriate screening for toxicity related to TDF.

European AIDS Clinical Society (EACS) guidelines on the prevention and management of metabolic diseases in HIV

Metabolic diseases are frequently observed in HIV‐infected persons and, as the risk of contracting these diseases is age‐related, their prevalence will increase in the future as a consequence of the benefits of antiretroviral therapy (ART).

Prediction of ESRD and Death Among People With CKD: The Chronic Renal Impairment in Birmingham (CRIB) Prospective Cohort Study

Background Validated prediction scores are required to assess the risks of end-stage renal disease (ESRD) and death in individuals with chronic kidney disease (CKD). Study Design Prospective cohort study with validation in a separate cohort. Setting & Participants Cox regression was used to assess the relevance of baseline characteristics to risk of ESRD (mean follow-up, 4.1 years) and death (mean follow-up, 6.0 years) in 382 patients with stages 3-5 CKD not initially on dialysis therapy in the Chronic Renal Impairment in Birmingham (CRIB) Study. Resultant risk prediction equations were tested in a separate cohort of 213 patients with CKD (the East Kent cohort). Factors 44 baseline characteristics (including 30 blood and urine assays). Outcomes ESRD and all-cause mortality. Results In the CRIB cohort, 190 patients reached ESRD (12.1%/y) and 150 died (6.5%/y). Each 30% lower baseline estimated glomerular filtration rate was associated with a 3-fold higher ESRD rate and a 1.3-fold higher death rate. After adjustment for each other, only baseline creatinine level, serum phosphate level, urinary albumin-creatinine ratio, and female sex remained strongly (P < 0.01) predictive of ESRD. For death, age, N-terminal pro-brain natriuretic peptide, troponin T level, and cigarette smoking remained strongly predictive of risk. Using these factors to predict outcomes in the East Kent cohort yielded an area under the receiver operating characteristic curve (ie, C statistic) of 0.91 (95% CI, 0.87-0.96) for ESRD and 0.82 (95% CI, 0.75-0.89) for death. Limitations Other important factors may have been missed because of limited study power. Conclusions Simple laboratory measures of kidney and cardiac function plus age, sex, and smoking history can be used to help identify patients with CKD at highest risk of ESRD and death. Larger cohort studies are required to further validate these results.

Lysosomal acid lipase deficiency – An under-recognized cause of dyslipidaemia and liver dysfunction

Lysosomal acid lipase deficiency (LAL-D) is a rare autosomal recessive lysosomal storage disease caused by deleterious mutations in the LIPA gene. The age at onset and rate of progression vary greatly and this may relate to the nature of the underlying mutations. Patients presenting in infancy have the most rapidly progressive disease, developing signs and symptoms in the first weeks of life and rarely surviving beyond 6 months of age. Children and adults typically present with some combination of dyslipidaemia, hepatomegaly, elevated transaminases, and microvesicular hepatosteatosis on biopsy. Liver damage with progression to fibrosis, cirrhosis and liver failure occurs in a large proportion of patients. Elevated low-density lipoprotein cholesterol levels and decreased high-density lipoprotein cholesterol levels are common features, and cardiovascular disease may manifest as early as childhood. Given that these clinical manifestations are shared with other cardiovascular, liver and metabolic diseases, it is not surprising that LAL-D is under-recognized in clinical practice. This article provides practical guidance to lipidologists, endocrinologists, cardiologists and hepatologists on how to recognize individuals with this life-limiting disease. A diagnostic algorithm is proposed with a view to achieving definitive diagnosis using a recently developed blood test for lysosomal acid lipase. Finally, current management options are reviewed in light of the ongoing development of enzyme replacement therapy with sebelipase alfa (Synageva BioPharma Corp., Lexington, MA, USA), a recombinant human lysosomal acid lipase enzyme.

Effect of ezetimibe in patients who cannot tolerate statins or cannot get to the low density lipoprotein cholesterol target despite taking a statin

ABSTRACT Background: Recent guidelines underline the need for high-risk patients to reach strict low density lipoprotein cholesterol (LDL‑C) targets (1.8–2.6 mmol/L; 70–100 mg/dL), and specifically mention the possible use of combination therapy (e.g. statin + ezetimibe) to achieve these goals. Methods: A retrospective case-note audit was carried out to assess the response to administering ezetimibe in patients unable to tolerate statins (Group 1), or high dose of statins (Group 2) and patients who cannot achieve the LDL‑C target (2.6 mmol/L; 100 mg/dL) despite taking a statin (Group 3). Results: Ezetimibe lowered LDL‑C levels by 20–29% across the 3 patient groups after 2–3 months of treatment. High density lipoprotein cholesterol (HDL‑C) levels tended to remain unchanged, although there was a consistent trend for a fall if baseline values were ‘high’. However, the LDL-C/HDL-C ratio changed significantly and favourably in all groups. The fall in fasting triglyceride levels in all groups was greater (reaching 19–25%) when baseline levels were ≥ 1.5 or 1.7 mmol/L (136–150 mg/dL). There were no marked abnormalities in liver function tests or creatine kinase activity. In Group 3 there was a significant trend for a fall in serum creatinine levels across the tertiles of baseline creatinine values. Limitations of the present study include the small sample size (especially in Groups 1 and 2), its short-term duration and the absence of event-based end-points. Therefore, the results are hypothesis-generating rather than conclusive. Conclusions: When used alone or added to a statin, ezetimibe favourably altered the LDL‑C/HDL‑C ratio and lowered triglyceride levels. Ezetimibe was well tolerated in patients with statin intolerance and was associated with a 26% fall in LDL‑C. An additional action may be some degree of improved renal function. Further studies are needed to confirm these findings.

Significance of plasma N-terminal pro-brain natriuretic peptide in patients with systemic sclerosis-related pulmonary arterial hypertension.

OBJECTIVES A single centre pilot study to investigate the role of the plasma N-terminal pro-brain natriuretic peptide (N-T proBNP) assay to risk stratify patients with suspected pulmonary arterial hypertension (PAH) from a background SSc population. METHODS Out of 49 SSc patients, 23 had and 26 did not have PAH. Right ventricular haemodynamic variables, six-minute walk test and plasma N-T proBNP levels were recorded from patients catheterised for suspected PAH (23 with PAH and 11/26 without PAH). RESULTS Mean value of N-T proBNP for SSc patients with PAH was 3365 (standard error 1095) pg/ml compared to 347 (174) pg/ml for patients without PAH. There was a statistically significant correlation (P < 0.05) between N-T proBNP values and (i) mean pulmonary artery pressure (r = 0.53), (ii) right ventricular end diastolic pressure (r = 0.59) and (iii) pulmonary vascular resistance (r = 0.49). Receiver operator characteristic curve analysis showed that a cut-off value of 395.34 pg/ml had a sensitivity of 0.69 and specificity of 1.0. CONCLUSIONS N-T proBNP estimation in systemic sclerosis-related pulmonary hypertension is a potentially useful diagnostic tool with a high specificity and negative predictive value. This test has the potential to have an important role in risk stratification and monitoring of therapy in the future.

Whole exome sequencing of familial hypercholesterolaemia patients negative for LDLR/APOB/PCSK9 mutations

Background Familial hypercholesterolaemia (FH) is an autosomal dominant disease of lipid metabolism, which leads to early coronary heart disease. Mutations in LDLR, APOB and PCSK9 can be detected in 80% of definite FH (DFH) patients. This study aimed to identify novel FH-causing genetic variants in patients with no detectable mutation. Methods and results Exomes of 125 unrelated DFH patients were sequenced, as part of the UK10K project. First, analysis of known FH genes identified 23 LDLR and two APOB mutations, and patients with explained causes of FH were excluded from further analysis. Second, common and rare variants in genes associated with low-density lipoprotein cholesterol (LDL-C) levels in genome-wide association study (GWAS) meta-analysis were examined. There was no clear rare variant association in LDL-C GWAS hits; however, there were 29 patients with a high LDL-C SNP score suggestive of polygenic hypercholesterolaemia. Finally, a gene-based burden test for an excess of rare (frequency <0.005) or novel variants in cases versus 1926 controls was performed, with variants with an unlikely functional effect (intronic, synonymous) filtered out. Conclusions No major novel locus for FH was detected, with no gene having a functional variant in more than three patients; however, an excess of novel variants was found in 18 genes, of which the strongest candidates included CH25H and INSIG2 (p<4.3×10−4 and p<3.7×10−3, respectively). This suggests that the genetic cause of FH in these unexplained cases is likely to be very heterogeneous, which complicates the diagnostic and novel gene discovery process.

The Effect of a 12-Week Course of Omega-3 Polyunsaturated Fatty Acids on Lipid Parameters in Hypertriglyceridemic Adult HIV-infected Patients Undergoing HAART: A Randomized, Placebo-Controlled Pilot Trial

BACKGROUND Hypertriglyceridemia is common in patients with HIV treated with highly active antiretroviral therapy (HAART). OBJECTIVE The goal of this study was to investigate the effect of the polyunsaturated fatty acids (PUFA) docosahexaenoic acid (DHA) 460 mg/eicosapentaenoic acid (EPA) 380 mg on hypertriglyceridemia in HIV-treated patients. METHODS A double-blind, placebo-controlled, randomized, multicenter pilot study was undertaken in 48 evaluable HIV-infected patients undergoing HAART, with fasting triglyceride levels of 3.39 to 11.3 mmol/L. Patients were allowed fibrate or niacin but not statins and were randomized to PUFA 4 g daily versus placebo for 12 weeks. The primary end point was mean fasting triglyceride levels. RESULTS The study included 48 patients; 23 in the PUFA group (mean age, 46.1 years) and 25 in the placebo group (mean age, 43.6 years). All except one were male. All patients in the PUFA group were white; in the placebo group, 20 were white, 4 Asian, and 1 black. The PUFA group had a mean body mass index of 24.7 kg/m(2); the placebo group, 24.1 kg/m(2). All patients were receiving concomitant fibrate therapy. Median baseline triglyceride levels were 5.58 (1.76-10.6) mmol/L for the PUFA group and 4.29 (1.81-6.14) mmol/L for the placebo group. PUFA reduced triglycerides by a median of 1.75 mmol/L versus a 0.41 mmol/L increase for the placebo group (baseline-corrected percentage change relative to placebo [95% CI, -69.48% to -6.53%; P = 0.019). No effect was seen on biochemical or virologic safety parameters. No severe treatment-emergent adverse events (TEAEs) occurred. Mild and moderate TEAEs occurred in 20 PUFA-treated patients versus 19 patients receiving placebo. Five were adjudged treatment related, and one was due to cholelithiasis, which led to early discontinuation. Most TEAEs affected the gastrointestinal tract (DHA/EPA, n = 7; placebo, n = 4) and comprised diarrhea, nausea, and flatulence (DHA/EPA vs placebo: 3, 2, and 2 vs 2, 0, and 0, respectively). CONCLUSIONS PUFA therapy with DHA/EPA reduced triglyceride levels significantly compared with placebo in HIV-infected patients with HAART-associated hypertriglyceridemia.

The effects of antiepileptic drugs on vascular risk factors: A narrative review

PURPOSE Epilepsy is associated with increased cardiovascular disease (CVD) morbidity and mortality. The exact causes of this link are not clearly defined. The role of antiepileptic drugs (AEDs) in influencing CVD risk in patients with epilepsy remains controversial. A link between epilepsy, AEDs and cardiac arrhythmias has been proposed and may be responsible for sudden unexpected death in epilepsy (SUDEP). METHODS We searched MEDLINE up to December 1, 2013 for relevant publications using combinations of keywords. We also examined the reference list of articles identified by this search and selected those we judged relevant. These were included in this narrative review. RESULTS AEDs may exert both beneficial and adverse cardiovascular effects. This narrative review considers the influence of AEDs on some predictors of vascular risk [i.e. weight, insulin resistance, metabolic syndrome, lipids, lipoprotein (a), C-reactive protein, homocysteine, vitamins, coagulation factors, uric acid, carotid intima media thickness, markers of oxidative status and matrix metalloproteinase-9]. Certain AEDs can also have pro-arrhythmic properties. CONCLUSIONS AEDs may exert different effects on various established and emerging predictors of vascular risk. Furthermore, pharmacokinetic interactions between AEDs and drugs used to reduce vascular risk (e.g. statins) need to be better documented. Whether this knowledge, in terms of individualizing antiepileptic and CVD prevention treatment, will prove to be relevant in clinical practice remains to be established.