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    <recommendedItem id="20100101_19_441"
                     title="Be Ready for Drug-Induced Vfib, Groups Urge (CME/CE)"
                     score="0.013"
                     href="http://www.medpagetoday.com/Cardiology/Arrhythmias/tb/18358?impressionId=1265797844499"
                     
      Awareness of medication-induced torsade de pointes and a preset protocol for treating it could save lives in the hospital with swift action to prevent cardiac arrest, according to a joint statement from two professional associations.&lt;br&gt;
&lt;br&gt;These cases &quot;should be avoidable&quot; with consistent electrocardiographic monitoring of patients receiving drugs known to prolong the QT interval, the American Heart Association and American College of Cardiology wrote in a statement endorsed by the American Association of Critical-Care Nurses.&lt;br&gt;
&lt;br&gt;The rare arrhythmia often provides telltale signs on ECG an hour or so before ventricular fibrillation, according to writing committee chair Barbara J. Drew, RN, PhD, of the University of California San Francisco, and colleagues.&lt;/p&gt;
&lt;p&gt;However, the statement made no one-size-fits-all recommendation on what cardiac monitoring should entail, given hospital-to-hospital differences in equipment that range from fully automated QT-monitoring systems at the high end to a computer-assisted electronic caliper feature at the other.&lt;/p&gt;
&lt;p&gt;&quot;Of utmost importance, however, is that a hospital protocol be established so that a single consistent method is used by all healthcare professionals charged with the responsibility for cardiac monitoring,&quot; Drew&apos;s group wrote.&lt;/p&gt;
&lt;p&gt;This protocol should stipulate which equipment to use for QT measurement, how to determine the end of the T wave, the formula for heart rate correction, lead-selection criteria, and the importance of measuring the same lead in the same patient over time, they said.&lt;/p&gt;
&lt;p&gt;The new statement, published online in &lt;em&gt;Circulation: Journal of the American Heart Association&lt;/em&gt; and the &lt;em&gt;Journal of the American College of Cardiology&lt;/em&gt;, included the following signs of impending torsade de pointes: &lt;ul&gt; &lt;li&gt;An increase of 60 ms in heart-rate&amp;#8211;corrected QT interval (QTc) from the preadministration baseline&lt;/li&gt; &lt;li&gt;Marked QTc interval prolongation of more than 500 ms&lt;/li&gt; &lt;li&gt;The characteristic &quot;twisting&quot; of the points on ECG as T-U wave distortion becomes more exaggerated in the beat after a pause&lt;/li&gt; &lt;li&gt;Visible (macroscopic) T-wave alternans&lt;/li&gt; &lt;li&gt;New-onset ventricular ectopy&lt;/li&gt; &lt;li&gt;Couplets and &lt;span&gt;nonsustained&lt;/span&gt; polymorphic ventricular tachycardia initiated in the beat after a pause&lt;/li&gt; &lt;/ul&gt;&lt;/p&gt;
&lt;p&gt;Prompt recognition of these ECG harbingers allows for treatment with intravenous magnesium, removal of the drug that induced the condition, and correction of electrolyte abnormalities and other exacerbating factors, including the prevention of bradycardia and long pauses with temporary pacing if necessary, according to the new statement.&lt;/p&gt;
&lt;p&gt;Prior guidelines on ventricular arrhythmias provided little help with prevention of torsade de pointes in the hospital but did recommend discontinuation of whatever drug induced long QT syndrome.&lt;/p&gt;
&lt;p&gt;The most common drugs associated with this potentially fatal arrhythmia are antibiotics, antipsychotics, and antiarrhythmia drugs.&lt;/p&gt;
&lt;p&gt;Administration in the hospital is more likely to be associated with torsade de pointes than is treatment of an outpatient population with the same drug, Drew&apos;s group noted.&lt;/p&gt;
&lt;p&gt;Hospitalized patients are often elderly, with comorbidities such as underlying heart disease and renal or hepatic dysfunction. They are also more likely to get intravenous push of the drugs.&lt;/p&gt;
&lt;p&gt;Clinical risk factors for torsade de pointes include: &lt;ul&gt; &lt;li&gt;A preexisting long QTc interval of more than 500 ms&lt;/li&gt; &lt;li&gt;Concurrent use of more than one QT-prolonging drug&lt;/li&gt; &lt;li&gt;Rapid infusion of a QT-prolonging drug intravenously&lt;/li&gt; &lt;li&gt;Heart disease, such as MI or heart failure&lt;/li&gt; &lt;li&gt;Advanced age&lt;/li&gt; &lt;li&gt;Female sex&lt;/li&gt; &lt;li&gt;Hypokalemia&lt;/li&gt; &lt;li&gt;Hypomagnesemia&lt;/li&gt; &lt;li&gt;Hypocalcemia&lt;/li&gt; &lt;li&gt;Treatment with diuretics&lt;/li&gt; &lt;li&gt;Impaired hepatic drug metabolism, whether from hepatic dysfunction or drug-drug interactions&lt;/li&gt; &lt;li&gt;Bradycardia&lt;/li&gt; &lt;/ul&gt;&lt;/p&gt;
&lt;div style=&quot;float:left;border-style:solid;border-width:1px;border-color:#8dabbc;font-family:arial;font-size:12px;background-color:#DBE9F2;padding:5px;&quot;&gt;&lt;p&gt;Drew reported conflicts of interest with GE Healthcare and Philips.&lt;/p&gt;&lt;p&gt;Co-authors reported conflicts of interest with Medtronic, Pfizer, PGxHealth, FAMILION, GE HealthCare, Philips Healthcare, Abbott, Bristol-Myers Squibb, sanofi-aventis, Schering Plough, Inovise, Siloam, ArgiNOx, Astellas, Daiichi Sankyo/Lilly, Heartscape Technologies, Biosite, Inovise, Medicines Co., Millennium Pharmaceuticals, PDL BioPharma, Roche Diagnostics, Scios, Mortara Instrument, Cardiac Science, MDS Pharma, Medicure, St. Jude, Adolor, ARCA, AstraZeneca, Avanir, Cardiome, CardioDx, Novartis, Ortho Diagnostics, Sanofi, Vanderbilt/Clinical Data, iCardiac Technologies, LipoScience, Anthera, Abbott Vascular, Novo Nordisk, Roche, Biotronic, and Boston Scientific.&lt;/p&gt;&lt;/div&gt;&lt;div style=&quot;clear:both;&quot;&gt;&lt;/div&gt;
    </recommendedItem>
    <recommendedItem id="20100101_19_361"
                     title="Hidden Dangers of Herbal Meds Reviewed"
                     score="0.009"
                     href="http://www.medpagetoday.com/PrimaryCare/AlternativeMedicine/tb/18244?impressionId=1265797844499"
                     
      Herbal medicines are not always the harmless nostrums that many patients and even some physicians think, but may actually contribute to cardiovascular morbidity and mortality, researchers warned in a review covering 44 years of research into the subject.&lt;br&gt;
&lt;br&gt;Many such products, including aloe vera, ginkgo biloba, ginseng, and green tea, can interact with conventional cardiovascular drugs and lead to serious adverse reactions, according to Arshad Jahangir, MD, of the Mayo Clinic in Scottsdale, Ariz., and two other Mayo physicians.&lt;br&gt;
&lt;br&gt;&quot;There is a clear need for better public and physician understanding of herbal products through health education, early detection and management of herbal toxicities, scientific scrutiny of their use, and research on their safety and effectiveness,&quot; they wrote in the Feb. 9 &lt;em&gt;Journal of the American College of Cardiology&lt;/em&gt;.&lt;/p&gt;
&lt;p&gt;Jahangir and colleagues also called for increased regulation of such products, at least requiring manufacturers of herbal medicines to register with the FDA and provide evidence of good manufacturing practices.&lt;/p&gt;
&lt;p&gt;&quot;Some of these adverse drug reactions are preventable,&quot; Jahangir told &lt;em&gt;MedPage Today&lt;/em&gt; in a telephone interview. &quot;Simple things like taking a good history or giving that history and discussing these issues, probably we can avoid [such reactions].&quot;&lt;/p&gt;
&lt;p&gt;Other physicians contacted by &lt;em&gt;MedPage Today&lt;/em&gt; and ABC News agreed that the growth in popularity of herbal medicines poses problems for physicians and patients.&lt;/p&gt;
&lt;p&gt;&quot;Because these remedies are &apos;natural,&apos; their potential dangers are not considered the same way they would be if they were medication,&quot; commented Suzanne Steinbaum, MD, a cardiologist at Lenox Hill Hospital in New York City, in an e-mail.&lt;/p&gt;
&lt;p&gt;&quot;For many reasons, patients tend not to disclose to their doctors if they are taking herbal remedies, including fear that their doctors won&apos;t approve or they will be told to stop them,&quot; Steinbaum added. &quot;This lack of knowledge and full-disclosure, for some, might be a fatal omission.&quot;&lt;/p&gt;
&lt;p&gt;Jahangir and colleagues reviewed nearly 90 publications that have addressed herbal or complementary therapies and cardiovascular effects since 1966.&lt;/p&gt;
&lt;p&gt;Their &lt;em&gt;JACC&lt;/em&gt; article listed 15 common herbal medicines known to interact adversely with conventional cardiovascular drugs.&lt;/p&gt;
&lt;p&gt;In many cases, the herbal products compete with the regular medicines for the same drug-metabolizing cytochrome P450 enzymes, potentiating the latter&apos;s effects. In other cases, the herbal products have their own cardiovascular effects.&lt;/p&gt;
&lt;p&gt;Many physicians already know that grapefruit juice occupies the CYP3A4 enzyme, leading to slower-than-expected metabolism and, therefore, higher blood levels of a host of pharmaceuticals.&lt;/p&gt;
&lt;p&gt;These include the statins, calcium channel antagonists, several common anti-arrhythmic drugs, and the angiotensin receptor blocker irbesartan (Avapro), Jahangir and colleagues noted.&lt;/p&gt;
&lt;p&gt;Garlic is one of several common herbal remedies with specific cardiovascular effects in its own right (others include ginkgo biloba, ginseng, and saw palmetto). Garlic inhibits platelet aggregation and thus can lead to increased bleeding risks when combined with aspirin, clopidogrel (Plavix), or warfarin (Coumadin), the researchers noted.&lt;/p&gt;
&lt;p&gt;The Mayo group identified 10 herbal products that increase bleeding risks with anticoagulant and antiplatelet drugs, as well as 14 that can induce arrhythmias.&lt;/p&gt;
&lt;p&gt;In all, Jahangir and colleagues listed 27 herbal products that patients with cardiovascular diseases would do well to avoid. These include such common and harmless-seeming products as green tea, capsicum pepper, licorice, and kelp, as well as grapefruit juice and garlic.&lt;/p&gt;
&lt;p&gt;&quot;We need to check with our patients what type of products they are using, to identify these potential interactions,&quot; Jahangir told &lt;em&gt;MedPage Today&lt;/em&gt;.&lt;/p&gt;
&lt;p&gt;He cited the previously reported figure of 100,000 deaths annually from drug interactions, adding, &quot;We don&apos;t even know how many of these are due to use of compounds that we are not aware that our patients are taking.&quot;&lt;/p&gt;
&lt;p&gt;Jahangir said he was surprised, in preparing the review, at the scale of hebal medicine use in the U.S.&lt;/p&gt;
&lt;p&gt;He and his colleagues found data from the 1990s suggesting that more patients consult complementary and alternative medicine providers than regular physicians.&lt;/p&gt;
&lt;p&gt;The total annual out-of-pocket expenditure on complementary and alternative medicine services and products also was greater than for conventional physician services.&lt;/p&gt;
&lt;p&gt;&quot;The surprise for me was . . . how much people are willing to spend on a type of therapy which has not shown, in any scientific way, to be effective or safe,&quot; Jahangir said.&lt;/p&gt;
&lt;p&gt;He added that the trend may reflect shortcomings of the conventional medical system.&lt;/p&gt;
&lt;p&gt;&quot;What is the reason people are going there? Is it because there is some unmet type of need that we are not recognizing as practitioners of conventional medicine?&quot;&lt;/p&gt;
&lt;p&gt;Jahangir said it may be that physicians aren&apos;t spending enough time with patients to understand their true needs. He said it appears that, &quot;despite the advancement in our technology and new medicines, there is a demand for alternative therapies that is increasing.&quot;&lt;/p&gt;
&lt;p&gt;He recommended that, in addition to asking patients in detail about herbal and other alternative therapies they may be using, physicians should educate themselves on what these therapies purport to do and what is known about their real biological effects.&lt;/p&gt;
&lt;p&gt;The &lt;a href=&quot;http://nccam.nih.gov&quot; mce_href=&quot;http://nccam.nih.gov&quot; target=&quot;_blank&quot;&gt;National Center for Complementary and Alternative Medicine&lt;/a&gt; at the National Institutes of Health is a good starting point for such information, both for physicians and for patients, Jahangir said.&lt;/p&gt;
&lt;p&gt;Lenox Hill&apos;s Steinbaum said it was important that conventional physicians &quot;become more open-minded and accepting&quot; of alternative medicine, if only because so many of their patients are already practicing it.&lt;/p&gt;
&lt;p&gt;David Meyerson, MD, JD, a Johns Hopkins University cardiologist, told &lt;em&gt;MedPage Today&lt;/em&gt; and ABC News in an e-mail that he advises patients to limit their use of &quot;unstudied and unproven and FDA-unregulated herbal medications.&quot;&lt;/p&gt;
&lt;p&gt;&quot;It&apos;s unfortunately very big business, and potential drug interactions and potential harmful effects abound,&quot; he wrote.&lt;/p&gt;
&lt;p&gt;But another physician criticized the Mayo physicians&apos; emphasis on adverse effects in their review.&lt;/p&gt;
&lt;p&gt;&quot;For many of products listed, evidence for side effects seems to be minimal,&quot; Scott Grundy, MD, of the University of Texas Southwestern Medical Center in Dallas, argued in an e-mail.&lt;/p&gt;
&lt;p&gt;He agreed that the efficacy and safety of such drugs remains largely unproven, but added, &quot;It is mainly for these reasons that they cannot be recommended for use.&quot;&lt;/p&gt;
&lt;p&gt;Creating alarm about side effects &quot;may not be the appropriate way to discourage their use,&quot; Grundy said.&lt;/p&gt;
&lt;p&gt;&lt;em&gt;This article was developed in collaboration with ABC News. &lt;/em&gt;&lt;img src=&quot;http://www.medpagetoday.com/upload/2009/10/1/14357_1.jpg&quot; mce_src=&quot;http://www.medpagetoday.com/upload/2009/10/1/14357_1.jpg&quot; alt=&quot;&quot;&gt;&lt;/p&gt;
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