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Heartbeat: Early cardiomyopathy or physiological left ventricular dilation in athletes?
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  1. Catherine M Otto
  1. Division of Cardiology, University of Washington, Seattle, WA 98115, USA
  1. Correspondence to Professor Catherine M Otto, Division of Cardiology, University of Washington, Seattle, WA 98115, USA; cmotto{at}uw.edu

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Athletic physical conditioning results in changes in cardiac anatomy and function that make it challenging to distinguish normal physiological changes from a pathological process in athletes with left ventricular (LV) dilation or a reduced ejection fraction. Millar and colleagues1 propose an approach for identifying athletes with dilated cardiomyopathy (DCM) based on sequential evaluation using N-terminal pro-brain natriuretic peptide (NT-proBNP) measurement, resting ECG, ambulatory ECG monitoring, exercise echocardiography and cardiac magnetic resonance (CMR) imaging. In 25 male athletes with LV dilation and an ejection fraction <55% compared with 35 asymptomatic active male patients with DCM, a failure to increase ejection fraction >11% compared with baseline on exercise echocardiography had the highest sensitivity, with a high specificity, for prediction of DCM. (figure 1)

Figure 1

The figure demonstrates the utility of the stepwise clinical algorithm for differentiating between physiological adaptation and morphologically mild DCM in apparently healthy individuals with LV dilatation and LVEF <55%. The number and percentages of both cohorts with abnormal investigations is shown with the cumulative TN and TP results on the extreme right and left, respectively. The overall sensitivity of the algorithm is 94.1% with a specificity of 83.3%. The PPV is 90.3% with an NPV of 94.7%. CMR, cardiovascular magnetic resonance; DCM, dilated cardiomyopathy; LV, left ventricular; LVEF, left ventricular ejection fraction; NPV, negative predictive value; NT-proBNP, N-terminal pro-brain natriuretic peptide; PPV, positive predictive value; TN, true negative; TP, true positive.

Donal, Paven and Galli2 comment that: “In clinical practice, when a physician does not understand the patient’s symptoms on effort, he might suggest an exercise test. Combining exercise and imaging, we can obtain a comprehensive information on heart anatomy and function, which might improve our understanding of the disease, its symptoms and prognosis. Increase in pathophysiological understanding might provide further insight to dealing with symptoms and eventually propose more specific treatments (figure 2). More work has to be done. But frankly Millar et al’s1 work is an important contribution to promoting exercise stress echocardiography for practical clinical reasoning.”

Figure 2

Algorithm justifying the use of exercise stress echocardiography.

Another interesting paper in this issue of Heart by Jepma and colleagues3 compared the effect of a community-based lifestyle intervention programme in older (age 65 years or older) vs younger (age <65 years) patients with coronary artery disease. Perhaps surprisingly, despite a higher prevalence of adverse cardiovascular risk factors and comorbidities, older patients were over 5X more likely to achieve weight loss of 5% or greater, whereas younger patients were more likely to show no improvement in life-style related risk factors (physical activity, weight reduction, smoking cessation). This findings highlight the important of lifestyle-interventions in older adults with coronary disease both in terms of each patient’s quality of life but also in terms of avoiding future adverse events and reducing healthcare costs.

In an editorial, Norekvål and Allore4 point out that cardiac rehabilitation “has over time evolved from a single-component exercise training programme into a comprehensive lifestyle programme targeting traditional risk factors delivered through group-based sessions. However, the setting (centre-based vs home-based, or a combined model) is especially relevant to older adults.” They further suggest that cardiac rehabilitation needs to go beyond traditional risk factors to address other issues relevant to each patient that contribute to suboptimal health. (figure 3)

Figure 3

Moving beyond traditional cardiac rehabilitation programmes in multimorbid older adults with functional decline by adding novel and tailored components targeting vulnerability factors.

Neopterin, a surrogate marker of plaque inflammation, is a predictor of coronary artery disease risk. In 4130 patients with suspected stable angina pectoris, Dhar and colleagues5 examined the association of plasma neopterin levels, stratified by serum lipid levels, with risk of acute myocardial infarction (AMI). The association of neopterin levels with risk of AMI was strongest in patients with a serum low density lipoprotein cholesterol (LDL-C) or an apolipoprotein B100 level below the median.(figure 4) In addition, neopterin levels were strongly associated with risk of AMI in patients with a Vitamin A level above the median, possibly related to the increased production of Vitamin A in response to oxidised cholesterol metabolites.

Figure 4

Risk association between log-transformed neopterin and acute myocardial infarction in subgroups of serum LDL-C levels, adjusted for age and sex. Shaded areas around the curves depict 95% CI. kernel density plots show the distribution of plasma neopterin. LDL-C, low‐density lipoprotein cholesterol.

In an editorial,6 Moss raises the question “What remains unclear with respect to cardiovascular risk modification is whether aggressive reduction of LDL-C is the only target that matters?” Following an elegant and detailed discussion of the issues, he concludes: “While LDL-C accumulation plays an integral role in the formation of atherosclerotic coronary plaque, we now know that there are many more variables that contribute to the acceleration or attenuation of coronary artery disease progression. Is it time for inflammatory biomarkers such as neopterin or hsCRP to be incorporated into routine clinical practice? This will ultimately depend on whether a more precise phenotype of coronary artery disease leads to more effective treatment use. Surely that is what matters most?”

A review article in this issue of Heart on diagnosis and treatment of acute recurrent pericarditis is well worth a read.7 Emerging data suggest that interleukin-1 receptor antagonists may be helpful in refractory cases, although further studies are needed. The Education in Heart article summarises the current indications and outcomes with balloon aortic valvuloplasty in adults with aortic stenosis.8 While the role of this approach has declined with the availability of transcatheter aortic valve implantation, this approach still has a role as a bridge to definitive therapy or as palliative care.

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Footnotes

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.

  • Patient consent for publication Not required.

  • Provenance and peer review Commissioned; internally peer reviewed.

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