User blog: Meguid El Nahas

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Changes in Albuminuria Predict Mortality and Morbidity in Patients with Vascular Disease. Roland E. Schmieder et al. on behalf of the ONTARGET Investigators  (JASN July 2011) report a further analysis of the ONTARGET study related to changes in albuminuria and its impact on cardiovascular outcomes and death. You may recall the ONTARGET study showed little benefit of combining an ACE inhibitor (Ramipril) and ARB (Telmisartan) on CVD in older and high risk patients. Moreover, ONTARGET showed that those treated with a combination of Ramipril and Telmisartan had a faster rate of CKD decline in spite of more significant reduction in albuminuria. 
The current analysis by the ONTARGET study group shows that changes over 2 years in albuminuria impacts on CVD outcomes; decreased albuminuria being associated with improved outcomes and increased albumin excretion rate having negative impact. These changes are not entirely independent from changes in blood pressure levels. The changes in albuminuria had less of an impact on renal outcomes. This is an interesting observation albeit at some variance with the primary report of ONTARGET implying that the study negative outcomes were associated with decreased proteinuria. 
The most likely explanation remains that:
1. This is a study of older atherosclerotic high CVD risk patients.
2. These patients are at highest risk of renal harm from combining ACEi + ARB; faster decline of kidney function with the inherent increased CVD risk! 
3. ACEi + ARB may be beneficial on CVD outcomes in a subgroup of patients whose albuminuria also happens to decrease; concern about subgroup analyses and power as well as validity of such analysis.
4.  The price of CVD and albuminuria improved outcomes may still be worsening CKD! is it a price worth paying knowing that worsening CKD increases by itself CVD risk!?
5. Changes in albuminuria may be independent from treatment and merely reflecting the progression or otherwise of underlying atherosclerotic vascular disease. Albuminuria is a reliable marker of CVD risk and mortality. The question that is always worth asking is: Do changes in Albuminuria ADD to other more established CVD outcomes predictors such as the Framingham Risk Score. My guess is probably NOT!
 
 
 
[ Modified: Thursday, 1 January 1970, 1:00 AM ]

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    Anyone in the world

    Rosuvastatin in Diabetic Hemodialysis Patients. Hallvard Holdaas et al. , on behalf of the AURORA study group report, in JASN July 2011 issue, a posthoc analysis of the AURORA study on Rosuvastatin in ESRD patients treated by HD. The AURORA study was a negative one as Rosuvastatin failed to improve survival and related endpoints. In this posthoc analysis the AURORA study group focuses on the results of a subgroup analysis of the diabetic patients who received Rosuvastatin in this study. They claim that it "might" improves cardiac events outcomes.

    Reading this report a number of comments come to mind:
    1. Posthoc analysis is the way investigators or their sponsors...desperate to show that a negative result is not a negative result keep searching subgroupos for a glimmer of hope; a positive result. So if the study is negative, look again...and again...until you find a positive result.
    2. The Nephrology community seems reluctant to accept that a negative trial outcome is a result as valid as a postive outcome?! Prehaps, the pharmaceutical sponsors are not as willing to accept a negative result that would seriously jeopardise their sales of the compound/drug under investigation...
    3. Subgroup analysis is not statistically valid as it is by definition underpower with an inadequate sample size. AURORA required 2776 patients to show a result (Negative); how can a study with 731 be valid in analysing the same endpoints?! I guess hence the: conclusion that Rosuvastatin "might" reduce the risk of cardiac events.
    4. The posthoc analysis for what it is worth also shwos that Rosuvastatin can cause considerable HARM in diabetic patients on HD: A 5 fold increase risk of hemorrhagic stroke!!!! hence my Blog title that Rosuvastatin "might" be harmful in diabetic haemodialysis patients. No matter how it is looked at there is little doubt that in most if not all statin studeis they increase risk of hemorrhagic stroke!
     
    My conclusion from reading this analysis: 
    "Better to accept that a study is negative than go on and on and on....trying to prove that it is positive!"
     
    [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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      Anyone in the world

      In the Lancet, this week publication of the results of two major and interesting studies on the control of DM and the impact on CV complications.

      The first by Lind and colleagues in 20,985 patients with T1DM showing that tighter DM control (lowe HbA1c) led to a significant decreased incidence of new heart failure; patients with HbA1c of less than 6.5% had four times less heart failure over 9 years compared to those with HbA1c of at least 10.5%. The authors conclude that poor glycemic control promotes heart failure in T1DM. Whilst this study gives support to tight glycemia ocntrol in T1DM, it does not argue for a similar reduction in glycemia in T2DM. In fact, the relationship between glycemia control and moratlity assumes a U-shaped curve with high mortality at Low and High HbA1c levels; (Opie et al. Heart 2011;97:6-14).

      The second study published in the Lancet this month by Griffin and colleagues reports data from ADDITION-Europe study of early and multifactorial management of T2DM patients versus standard care in a primary care setting. The intensive treatment group had better reduction of BP and LDL cholesterol. Overall, over ~5 years follow-up there was a non-significant reduction in the risk of composite cardiovascular endpoints in the intensive multifactorial group compared to routine care. Small differences in glycemia, BP and LDL cholesterol levels in favour of the multifactorial intensive treatment group may have contributed to the trend towards improved outcome in this group although it did not reach statistical significance. Of note statin intake was comparable in the two groups.

       Unfortunately, this study has a number of limitations including:

      1. Insufficient number of patients and most likely an inadequate power due to the lower than expected rate of complications in the control group.

      2. Event rates in the routine group were much lower than expected due to overall improved care of people with DM. This may be explained by improved BP and dyslipidemia in the routine care group based on the recommendations of national and international guidelines .Data from a number of studies imply that BP and lipids control are the most important to reduce CVD risk in DM2.

      3. The small difference between the groups in Glycemia, BP and lipids control.

      Overall, these two studies argue for more efforts in the management of glycemia (T1DM) but also agressive reduction in BP and control of dyslipidemia (T2DM). ADDITION-Europe shows that such an approach apears to reduce overall events rate making further distinction between routine an dintensive care difficult.

      Perhaps, good metabolic and BP control in T2DM is good enough...!!!!  

       

      [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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        by Meguid El Nahas - Monday, 4 July 2011, 4:35 PM
        Anyone in the world

        Gale and colleagues from London and Cyprus reported in 2010 the association between Complement factor H-Related protein 5 (CFHR-5) nephropathy and endemic CKD in Cyprus. They identified a novel mutation of the CFHR5 gene in cypriot families causing an autosomal form of isolated mesangial C3 deposition and a clinical picture very similar to mesangial IgA nephropathy (Lancet 2010). In the June issue of cJASN Athanasiou and colleagues describe the clinical entity associated with the CFHR5 mutation. The majority of patients prsent with isolated microscopic hematuria with around 38% also shoiwng proteinuria. Impaired kidney function an dprogressive CKD is more likely to develop in older patients (>50 years) where 80% of men  and 21% of women developed CKD. 20% developed ESRD; mostly men. Of interest, almost all male patients  with CFHR5 nephropathy who progressed to ESRD had recurrent episodes of macroscopic hematuria during childhood associated with URTI.

        This disease shows that dysregulation of the alternative complement pathway following a mutation of CFHR5 leads to isolated C3 mesangial deposition and a clinical phenotype similar to mesangial IgA nephropathy. 

        [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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          Anyone in the world

          A small RCT is reported in the June issue of cJASN relating to technique survival in peritoneal dialysis patients  with diabetic nephropathy comparing standard glucose solutions (4x2L/24h) and (3x2L +) Icodextrin dwell (Takatori et al. Okayama, Japan).

          The authors conclude that over 24months technique survival on CAPD was better in the group receiving an additional Icodextrin dwell. This was related primarily to an improved fluid balance control and a lower switch to HD due to fluid overload. There was no difference between the two groups in dialysis adequacy; KT/V and D/P Creatinine. There was no impact on residual renal function.

          This is a small RCT with 21 and 20 patient in the two groups. Such a small number always raises concern over the possibility of the small sample size and inadequate power may lead to statistical bias and type1 error (False positive result). Also, it appears as if the analysis was per protocol (PP) confined to a small number of patients and not as intention to treat (ITT) including all those who were randomised.

          Finally, the study confirms the obvious that icodextrin has a more sustained osmotic effect and improves fluid balance by mobilising more fluid. As patients with diabetic nephropathy have a tendency to fluid retention, the result is not suprising. Also, no data is given on the treatment modality of patients based on their transporter status; high transporters would have been better off on APD.  

          A more logical approach to these patients would have been:

          1. Define patients' transporter status.

          2. Treat High and high average groups by APD

          3. Treat the low transporters by CAPD

          4. Use standard Glucose versus glucose + icodextrin solutions and evaluate outcomes

          A much larger number of patients would be warranted for this type of RCT. 

          In the meanwhile, nephrology journals continue to publish small and meaningless clinical trials?!

          [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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            by Meguid El Nahas - Friday, 24 June 2011, 5:46 PM
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            Nephron Digest June 2011

            IgA-Dominant Postinfectious Glomerulonephritis: A New Twist on an Old Disease (Samih H. Nasr, Rochester, Minn. and Vivette D. D’Agati, New York, N.Y.;Nephron Clin Pract 2011;119:c18-c26). The review by Nasr and D’Agati draws the reader’s attention to the changing nature of postinfectious glomerulonephritis. IgA-dominant postinfectious glomerulonephritis is increasingly being recognized. The article highlights the fact that this form of acute glomerulonephritis is more likely to occur in the elderly, the immunocompromised and those with diabetes. It also stresses the association with staphylococcal infections and the range of histological changes including the mesangioproliferative form associated with IgA deposits. In developing countries, including the Far East, where IgA nephropathy is quite common, it is important to distinguish between postinfectious IgA nephropathy and an acceleration of idiopathic IgA nephropathy or a superimposed infection. In addition to hypocomplementemia and subepithelial immune deposits characteristic of postinfectious glomerulonephritis, patients with postinfectious IgA-dominant glomerulonephritis tend to present frequently with AKI when compared to those with idiopathic IgA nephropathy. The poor prognosis and lower recovery rate associated with IgA-dominant postinfectious glomerulonephritis is attributed to the associated comorbidities. Nephrologists should be aware of this entity and include it in the differential diagnosis of elderly patients presenting with AKI.

             


            The ‘Centre Effect’ in Nephrology: What Do Differences between Nephrology Centres Tell Us about Clinical Performance in Patient Management?(Hodsman and colleagues, (Bristol and Southampton; Nephron Clin Pract 2011;119:c10-c17). This review by Hodsman and her colleagues from the UKRR Centre in Bristol examines an important and timely issue, that of the 'centre effect' in healthcare delivery. Increasingly, commissioners of healthcare assess the quality of care delivery by drawing comparisons to national and international 'standards' and link the care delivered to the resources allocated. National/international comparisons are not always applicable in view of a number of variables that impact on a given healthcare centre. The review discusses the different factors affecting healthcare delivery including the patients' case mix and organisational characteristics ('compositional effect'). Moreover, geographical and sociodemographic factors may affect a centre performance, including poverty with associated poor compliance and difficulties in accessing available services. The authors discuss how the gap and linkage between centre provisions and patients' outcome can be studied and closed. Focusing on a multi-variable quality performance, rather than on individual parameters/processes, may ultimately provide a more holistic and successful approach to quality and outcomes.

             

             

            Parallel Deterioration of Albuminuria, Arterial Stiffness and Left Ventricular Mass in Essential Hypertension: Integrating Target Organ Damage (E. Andrikou and colleagues, (Athens; Nephron Clin Pract 2011;119:c27-c34). Andrikou and colleagues report on 428 non-diabetic untreated hypertensives' ACR (urine albumin:creatinine ratio) and c-f PWV (pulse wave velocity, a measure of arterial stiffness). Age, male sex, 24-hour systolic BP, ACR and c-f PWV were independent predictors of left ventricular hypertrophy (LVMI). Increased ACR in conjunction with pronounced arterial stiffness is accompanied by augmented LV mass and higher LVH rates. The close interrelationships between albuminuria, c-f PWV and LVMI suggest parallel target organ damage progression. This is not surprising since untreated hypertension is likely to have a detrimental effect on a number of end-organs including arteries, heart and kidneys. I have put forward the Cardio-Kidney-damage (C-K-D) concept a few years ago to highlight such a close link between hypertension, systemic vascular damage and albuminuria in the community. It is often said that patients with CKD have higher CVD risk, but this may simply reflect that patients with CKD in the community already suffer from underlying CVD and therefore would naturally have higher CVD mortality. Of interest, the prognosis of these patients has recently been shown to be predictable by conventional CVD risk scores (like the Framingham Risk Score), with little added value of adding albuminuria or GFR to the scoring system!

             

             

            Prevalence of Chronic Kidney Disease and Associated Risk Factors, and Risk of End-Stage Renal Disease: Data from the PREVADIAB Study (J. Vinhas and colleagues, Coimbra; Nephron Clin Pract 2011;119:c35-c40). The authors analyzed data from a nationally representative sample of 5,167 subjects, and estimated the prevalence of CKD stages 3 to 5 to be around 6.1. The prevalence of risk factors such as diabetes (11.7%), obesity (33.7%), and metabolic syndrome (41.5%) was similar to that in the US, but greater than in most European countries. The risk of ESRD was greater than in other European countries, but lower than in the US. The authors conclude that the high incidence of ESRD among the Portuguese population is not due to a greater prevalence of CKD but may be associated with a higher rate of CKD progression. Caution in the interpretation of CKD prevalence in populations should be exerted when evaluating such reports as cross-sectional, single test analyses have been associated with over-reporting of CKD. Also, a high ESRD/CKD ratio may be due to faster progression but also to lower mortality as the majority of CKD patients do not reach ESRD, but instead die from CVD. It would be interesting to know if Portugal has a lower CKD3-4 mortality and also if current global efforts to reduce CVD mortality will lead to an increased burden of ESRD worldwide..?!

             

             

            [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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              Anyone in the world

              A posthoc analysis by Mallamaci and colleagues (JASN June 2011 issue) of the REIN study suggests that CKD patients suffering from obesity are at higher risk of ESRD and that Ramipril can abolish this increased risk of renal progression and ESRD. This is of considerable interest, if confirmed, considering the increasingly prevalence of obesity and CKD. Also a growing number of publications has suggested a link between obesity and CKD and its progression. Also there is good evidence that the adipose tissue itself can generate excess of RAS, justifying the inhibition of this system in obese individuals with CKD.

              However a few words of caution:

              1. REIN was a partially blinded study with unblinding taking place during the course of the trial (week 27)!?

              2. IN the overall population group REIN showed little difference in teh rate of CKD progression between placebo (0.26ml/min/month) and Ramipril (0.26ml/min/month)! It was only effective at reducing the number of ESRD hence teh benficial combined endpoint; difficult to understand why and how there was increased incidence of ESRD in control group although its rate of progression did not differ from the ramipril group? Starting RRT can be a subjective decision in an unblinded study.

              3. Caution with the interpretation of posthoc and subgroup analyses as studies are not laways powered to address these points.

               

               

               

              [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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                Anyone in the world

                An analysis by Clase and colleagues (Ann Intern Med. 2011;154:310-318) based on the ONTARGET cohort shows that adding albuminuria or eGFR to traditional CVD risk factors adds little to the CVD predictive value of the latter. This analysis is in agreement with that made by Chang and Kramer in Nephron that reviewed studies a number of studeis showing that traditional predictive scors for CVD improve little by adding parameters of renal function. Whilst there is little doubt that Albuminuria and eGFR predict CVD outcomes as well as CVD mortality and all cause mortality, doubt is emerging whether they have added predictive value when combined to traditional risk scores such as the Framingham Risk Score. Further analysis is needed to clarify this issue. After all, the majority of CKD in communities are older individuals over the age of 65. In those traditional CVD risk scores may suffice. On the other hand, albuminuria and/or eGFR may have a useful additional predictive value in lower risk and young individuals with little underlying CVD. Further analysis is needed to clarify that important issue.

                [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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                  Anyone in the world

                  Increasingly, I come to realise that the two and three days intensive CME meetings packed with endless lectures by an endless list of eminent senior nephrologists that is favoured by so many nephrology CME orgainsers and societies is a waste of time. I wonder how many of those young nephrologists sitting in the back of some of these CME meetings digest the heavy content of lectures???? I wonder is that old fashioned didactic style of teaching with often recirculated and regurgitated lectures help anybody other than the travelling party of lecturers visiting yet another nice country...

                  It is high time that we, as educators, pay more attention to the educational needs of our younger colleagues.

                  It is high time we design CME programs that involves them in the planning; how often do we ask an audience to choose from a list of topics "Menu". I did that recently and there was panic in the audience...surprise, even dismay, that they can choose themselves the teaching topic that I was about to give them. They are so used to be told what to learn...what to do... and has lost the courage to take initiatives and the responsibility of their own learning!?

                  The Global Kidney Academy (GKA) has been set up to address some of these needs in emerging countries and also teach young emerging nephrologists to become educators themselves and take the lead in organising their own teaching requirements. Leadership in Education has to come from them and we should support their initiatives. For that I have also founded the international Nephrology Education Foundation (iNEF) to support their initiatives through grants and other means of support.

                  Teaching should consist more of Workshops aimed at young emerging nephrologists based on their choice of topics and relying on case-based small group discussions and breakout sessions facilitated by a regional as well as international faculty.

                  Gone the endless 45minutes rehashed lectures!

                  It is time to move on with Nephrology education Worldwide into a more user friendly format owned by the user and facilitated by those who support their training! 

                   

                  [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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                    by Meguid El Nahas - Monday, 6 June 2011, 6:55 PM
                    Anyone in the world

                    A number of articles including that by Cooper et al (IDEAL study) explored the notion that late initiation of RRT is not harmful and may be even beneficial (Rosansky et al, 2010). It strikes me that most of these papers advocating late onset RRT and the potential harm of early RRT initiation use the wrong parameter; namely MDRD derived eGFR, a test known to be unreliable at this late stage of CKD and GFR<15. Further, eGFR in these patients would be strongly influenced by changes in serum creatinine which in turn would be affected by changes in muscle mass. So a patient with eGFR of 15ml/min may have a lower serum creatinine than one with a eGFR of 5-10ml/min as a result of muscle wasting and malnutrition and would clearly fare worse on RRT! It is high time that nephrologists stop equating GFR derived from serum creatinine based equations in advanced stages of CKD.

                    It is also high time that more emphasis is put on early referral for RRT rather than the actual timing of initiation of RRT; considering that in the majority of emerging countries where mortality of RRT is very high, most patients are referred to Nephrologists within 60-90 days from theinitiation of RRT! Thus depriving them from adequate pre-dialysis care and monitoring!

                    Read: Early Start of Dialysis: A critical Review in CJASN May 2011.

                    [ Modified: Thursday, 1 January 1970, 1:00 AM ]

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