March 14th, 2011 by AnnMacDonald in Health Tips, True Stories
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While I was browsing the produce section of my grocery store the other day, the sound of a panicked voice coming over the store’s loudspeaker made me jump. “Does anyone in the store know CPR? Anyone? CPR? We need you in baked goods!”
I froze. In theory, I know how to perform CPR — cardiopulmonary resuscitation. I took a two-hour course on it nearly 25 years ago. But I hadn’t given it much thought since then and I certainly hadn’t practiced what I learned.
My mind started whirling as I tried to remember the sequence of steps. They’d changed the rules a few years back — I knew that much — so I wouldn’t have to do mouth-to-mouth resuscitation. But where exactly on the chest was I supposed to push? Should I form a fist and push down with my knuckles, or use the ball of my hand?
Suddenly, sirens wailed outside the store. The rescue squad had arrived. Too late, as I learned afterward, for this man, who was a victim of a sudden cardiac arrest. This type of heart attack strikes so fast that there usually aren’t any warning signs. You might see someone grasp his or her chest, collapse, twitch and gasp a few times, and then lie deathly still.
At that point, every minute counts. Enough oxygen remains in the person’s bloodstream to nourish the brain for several minutes — but a bystander has to circulate oxygenated blood to the brain and other organs by pushing down on the chest hard and fast, mimicking the heartbeat.
I’m a health writer. I knew this intellectually. But until those agonizing moments in the grocery store, I never really understood on a gut level just how important every minute is. Read more »
*This blog post was originally published at Harvard Health Blog*
March 10th, 2011 by Shantanu Nundy, M.D. in Health Tips, Research
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What is the leading cause of death in the United States? Heart disease? Cancer? No, it’s smoking. Smoking? Yes, depending on how you ask the question.
In the early 90s, McGinnis and Foege turned the age-old question of what people die of on its head by asking not what diseases people die of but rather what the causes of these are. Instead of chalking up the death of an older man to say lung cancer, they sought to understand the proximate cause of death, which in the case of lung cancer is largely smoking. Using published data, the researchers performed a simple but profound calculation — they multiplied the mortality rates of leading diseases by the cause-attributable fraction, that proportion of a disease that can be attributed to a particular cause (for example, in lung cancer 90 percent of deaths in men and 80 percent of deaths in women are attributable to smoking). Published in JAMA in 1993, their landmark study became a call to action for the public health community.
When looked at the conventional way, using data from the 2004 update of the original study, heart disease, cancer, and stroke are the leading causes of death, respectively. This accounting may help us understand the nation’s burden of illness, but does little to tell us how to prevent these diseases and improve health. Through the lens of McGinnis and Foege we get the actual causes of death (e.g., the major external modifiable factors that contribute to death). This analysis shows that the number one cause of death in America is tobacco use, followed closely by poor diet and lack of physical activity, and then alcohol consumption. Read more »
*This blog post was originally published at BeyondApples.Org*
March 9th, 2011 by DrWes in Opinion, True Stories
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On September 27, 2010, the peer-reviewed scientific journal Europace published online-before-print a case report entitled “Spontaneous explosion of implantable cardioverter-defibrillator” by Martin Hudec and Gabriela Kaliska. In the pdf of that case report a figure containing a color photo of the affected patient’s chest, chest X-ray, and two pictures of the extracted device (one seen here) were included.
The pictures and case presentation were dramatic and the case very rare. Both were perfect reasons to report such an important case to the medical literature. And so these doctors sent the case to Europace on June 29, 2010, and the article was accepted after revision on August 16, 2010, with the article appearing online September 27, 2010.
The authors must have felt very proud to have an article published relatively quickly, and the editors and reviewers of Europace must have thought the case was unique enough and important enough to have the article revised according to their specifications, then published online — until I reported the case on this blog on October 5, 2010, and included images from a portion of the case report’s figure.
Remarkably, later that same day, Europace removed the case report from its website without comment. The article simply vanished. I attempted to e-mail the editor of Europace to inquire about the reason for the retraction but received no reply, so I contacted the lead author, Martin Hudec, M.D. He kindly responded and I included his email response in the comments to my post two days later. Read more »
*This blog post was originally published at Dr. Wes*
March 5th, 2011 by Dr. Val Jones in True Stories
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In medicine we’re often reminded not to base our therapy solely on lab test results. Although it’s tempting to reduce patient care to a checklist of “normal” bloodwork targets, we all know that this is only a fraction of the total health picture. Today I made a mistake that brought this truism home: “Don’t treat the number, treat the patient.”
I’m turning 40 this year and decided to make an ambitious fitness goal for myself — to be in better shape at 40 than I was at 30. No small feat for a person who used to be in good form a decade ago (not so much now, ahem). So, I joined a gym owned by an affable triathlete and invited her to make me her project. Let’s just say that Meredith believes that one piece of sprouted grain bread is the breakfast of champions — and with that she has me doing many hours of cardio sprints and strength training every week. I’m still alive. Barely.
Today in my endurance spinning class (an unusual form of torture where you get yelled at — I mean encouraged — on a stationary bicycle for an hour and a half in a dark room filled with high-decibel rock music and sweaty co-sufferers), I was somewhat alarmed by my heart rate. I was taught in medical school that one’s maximum heart rate is 220 minus your age. So mine should be about 180. I assumed that anything higher than that was incompatible with life.
So when I saw my heart rate monitor rise to 185 on a steep climb at maximum speed, I wondered if I might be about to die. I certainly felt physically challenged, but not quite at death’s door, so I looked around sheepishly at my nearest peer’s monitor to see if she was handling the strain any better. Nope, she was also at 185. “Gee, what a coincidence,” I thought. “We must be exactly the same fitness level.” Read more »
March 5th, 2011 by John Mandrola, M.D. in Opinion, Research
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It’s hard to believe that turbulence could be a good thing for the heart. Consider how the word turbulent is defined: “Characterized by conflict, disorder, or confusion; not controlled or calm.” Those traits don’t sound very heart-healthy. But when it comes to heart rhythm, it turns out that a turbulent response — to a premature beat — is better than a blunted one. The more turbulent the better.
No, you haven’t missed anything, and turbulence isn’t another of my typos. Until [recently], heart rate turbulence was an obscure phenomenon buried in the bowels of heart rhythm journals.
What Is Heart Rate Turbulence (HRT)?
When you listen to the heart of a young physically-fit patient, you are struck not just by the slowness of the heartbeat, but also by the variability of the rhythm. It isn’t perfectly regular, nor is it chaotic like atrial fibrillation (AF). Doctors describe this — in typical medical speak — as regularly irregular: The heart rate increases as the patient inhales and slows as he or she exhales. This variability occurs as a result of the heart’s responsiveness to its environment. The more robustly and quickly the heart responds, the healthier it is.
HRT seeks to measure how quickly and vigorously the heart rate reacts in response to a single premature beat from the ventricle — a premature ventricular contraction (PVC). Normally after a PVC, the heart rate speeds for a few beats, and then slows back to baseline over the next 10 beats. The healthy heart responds with a more intense rise in heart rate and a quicker return to baseline. Using simple measurements of heart rate from a standard 24-hour electrocardiogram (ECG) monitor, a propriety software program averages many of these responses and comes up with a measurement of turbulence onset and turbulence slope. Read more »
*This blog post was originally published at Dr John M*
