Monday, 12 August 2013 Dr. Walt Larimore
If Mr. Bush had visited a general internist (or family physician) practicing sound, evidence-based care, he would not have had cardiac testing. Instead, the doctor would have had conducted age-appropriate cancer screening. For the former president, this would include only colon cancer screening. It no longer would include even prostate-specific antigen testing for cancer. The doctor would have screened for cholesterol, checked for hypertension and made sure the patient was up to date on age-appropriate vaccinations, including those for pneumococcal pneumonia and shingles. Presumably Mr. Bush got these things, and he got the cardiac test as well.
What value does a stress test add for an otherwise healthy 67-year-old?No study has shown that this examination improves outcomes. The trials that have been done for so-called routine stress testing examined higher-risk patients. They found that performing stress tests on people at high risk of cardiovascular disease may detect blockages but does not improve symptoms or survival. Routine stress testing does, however, increase the use of procedures such as coronary stenting.
Unfortunately, Mr. Bush, like many VIPs, may be paying the price of these in-depth investigations. His stress test revealed an abnormality, prompting another test: a CT angiogram. This study showed a blockage, which was stented open during an invasive procedure. It is worth noting that at least two large randomized trials show that stenting these sorts of lesions does not improve survival. Because Mr. Bush had no symptoms, it is impossible that he felt better after these procedures.
Instead, George W. Bush will have to take two blood thinners, aspirin and Plavix, for at least a month and probably a year. (The amount of time a blood thinner is needed depends on the type of stent placed). While he takes these medications, he will have a higher risk of bleeding complications with no real benefit.
Although this may seem like an issue important only to the former president, consider the following: Although the price of excessive screening of so-called VIPs is usually paid for privately, follow-up tests, only “necessary” because of the initial unnecessary screening test, are usually paid for by Medicare, further stressing our health-care system. The media coverage of interventions like Mr. Bush’s also leads patients to pressure their own doctors for unwarranted and excessive care.My good friend (and internationally-recognized lipidologist [expert in cholesterol and other blood fats]), Thomas Dayspring, MD, has written a more detailed editorial, “Commentary regarding the angioplasty and stent of President George W. Bush,” for medical professionals. I encourage my health professional readers to read Tom’s commentary in detail. Here’s a small excerpt:
George W. Bush underwent stent placement because during a routine physical a stress test (which is rarely indicated in an asymptomatic person) revealed an abnormality that led to a CT-angiogram test (which is rarely indicated in an asymptomatic person) that led to a coronary angiogram test (which is rarely indicated in an asymptomatic person) that as usual led to a stent (which is rarely indicated in an asymptomatic person).
Why was an angiogram done on an asymptomatic person?
There is a bit of a history here – all public knowledge. During his second year in office during a yearly physical at Bethesda his physician did a routine coronary calcium level which was 4 (trivial). Even though his LDL-C was fine (~100 mg/dL superb by 2001 standards), they started him on a statin and as one would suspect, a low fat diet. It is well known what a super exercise routine Mr. Bush pursues (then and now): secret service men cannot keep up with him on jogs or bike rides.
Now we find out that he suddenly needed a stent?
Well do not clogged pipes; I mean arteries – need plumbers to fix them? And is it not dietary fat and cholesterol that clogs the arteries?Earlier in the year Dr. Dayspring posted a commentary in which he answered his own questions. In the editorial, “Coronary Artery Disease as Clogged Pipes A Misconceptual Model,” Dr. Dayspring writes that his commentary, “… was provoked by a perspective authored by Michael Rothberg of the Cleveland Clinic which was published in Circulation Cardiovascular Quality Outcomes (2013;6:129-132) entitled ‘Coronary Artery Disease as Clogged Pipes: A Misconceptual Model‘.” Dr. Dayspring writes, “It is a brilliant piece and needs to be read by all health professionals, including Mr. Bush’s physicians.” Here are some of the many highlights verbatim from that perspective:
Dr. Dayspring adds:
- Although the image of coronary arteries as kitchen pipes clogged with fat is simple, familiar, and evocative, it is also wrong.
- The clogged pipe analogy implies cholesterol plaques in the arterial walls slowly encroach on the lumen, causing silent ischemia first, then angina, and eventually infarction. Diagnosis begins with physiologic stress testing, looking for supply–demand mismatch, and progresses to angiography to find blockages. Treatments based on this theory include both coronary bypass and angioplasty, the latter often explained to patients as a Roto-Rooter.
- Results of such revascularization procedures are visually striking and, in stable disease, may lead to the erroneous conclusion that the plumbing problem has been fixed and the risk of myocardial infarction ameliorated.
- Although high-grade stenoses can cause chronic angina, most cardiac events occur at lesions that appeared mild on previous angiography —- Before rupture, these plaques often do not limit flow and may be invisible to angiography and stress tests. They are therefore not amenable to percutaneous coronary intervention (PCI).
- Local interventions can only relieve symptoms; they cannot prevent future myocardial infarctions. Indeed, at least 12 randomized trials conducted between 1987 and 2007 and involving >5 000 patients have found no reduction in myocardial infarction attributable to angioplasty in any of its forms. Despite this overwhelming evidence, the plumbing model, complete with blockages that can be fixed, continues to be used to explain stable coronary disease to patients, who understandably assume that PCI will prevent heart attacks. Cardiologists also cling to the belief that for patients with stable coronary disease, an open artery is beneficial, and the approach to stable coronary artery disease continues to be a search for ischemia. Not surprisingly, a substantial minority of cardiologists also believe that elective angioplasty and stenting can prevent heart attacks.
- The plumbing model—in which dietary fat or cholesterol is slowly deposited in arterial walls, leading to blockages—also perpetuates misconceptions about fat consumption. Although atheromatous plaques contain lipids, they are not composed of fat directly from the diet.
- Recommended limiting total dietary fat to 30% of calories and saturated fat to 10% on the basis of the caloric density of fat and the association of saturated fat with coronary heart disease across countries. The interpretation of this evidence was selective. — low-fat diets became synonymous with heart-healthy diets and gave birth to a generation of low-fat, high-sugar substitutes. — More recent observational studies do not support the use of low-fat diets. Subsequent studies have also found no link between saturated fat and heart disease
- In these diets, fat is simply replaced by sugar. More recently, the AHA recommended that people limit their intake now appears to contribute to obesity, hypertension, and subsequently coronary heart disease. However, patients and many doctors have not gotten this message. The AHA’s heart-healthy label still appears on a number of low-fat, high-sugar foods, including fruit juices and sugary cereals. —- patients continue to believe that dietary fat, especially the saturated fat found in cheese and bacon, is the cause of heart disease.
- The 2011 American College of Cardiology Foundation/AHA/Society for Cardiovascular Angiography and Interventions guideline for PCI — “evaluation of 61 trials of PCI conducted over several decades shows that despite improvements in PCI technology and pharmacotherapy, PCI has not been demonstrated to reduce the risk of death or [myocardial infarction] in patients without recent [acute coronary syndrome] — clinicians and investigators, working from an outdated conceptual model, have mistakenly focused on improving the technology for keeping open flow-limiting lesions, believing that better stents would eventually yield a mortality benefit in stable disease. The inflammatory disease model makes clear that such attempts are doomed to fail because vulnerable plaques cannot be identified or stented before rupture.
- Clearly, the current consent process in regard to PCI for stable angina is deeply flawed because most patients do not correctly understand the benefits of the procedure they are about to undergo, and many do not have angina.
- It is difficult to admit that in the past we got it wrong and performed what now appear to have been unnecessary procedures.
Has anyone watched the expert doctors on many TV channels commentating on Mr. Bush?Many seem to be unaware of the concepts outlined above. A physician expert on NBC in Manhattan commented in clueless fashion that Mr. Bush’s only prayer – and that of the asymptomatic American public looking to avoid a fatal heart attack – is to restrict dietary fat ever lower. Is she aware of the recently published in the New England Journal of Medicine (the LOOK AHEAD trial) where a low fat diet/exercise regimen caused weight loss in obese T2DM (type 2 Diabetes Mellitus) patients but the trial was stopped for futility because there was no reduction in clinical CV events? Is she aware of the complete absence of clinical trials showing any benefit from a low-fat diet on any hard CV endpoint? Is she not aware that dietary cholesterol plays almost no role in atherosclerosis – that the problem is endogenously produced cholesterol?
So unless the former President was suddenly having angina-type symptoms (which has not been mentioned in any reports – and it is doubtful to me that he was as I do not see how he could be doing his intense daily exercise regimen) – there is precious little evidence that his new stent will make a damn bit of difference.
We have any number of modern trials showing aggressive medical management is just as good at reducing subsequent CV morbidity and mortality as is a “plumbing” procedure.
What Mr. Bush really needed was an intensive biomarker search to define what lipid, lipoprotein, metabolic (including insulin resistance), genetic, inflammatory, and coagulation, etc., abnormalities he has. Only then could specific nutritional and therapeutic advice be sanely offered.
If insulin resistance issues are present he needs to consult enlightened nutritionists (and cardiologists) who understand that considering the low-fat diet (and angioplasty and stents in asymptomatic individuals) to be the cure all for every case of atherosclerosis is akin to following the leech and blistering therapies of the past.For more opinions on the inappropriateness of the workup please see this article in Heart.org.
I’ll be interested in the comments of readers.
Read the complete article here.