Japan Earthquake Spurred Jump in Heart Ailments: Study

The earthquake that spawned a tsunami and a nuclear crisis in Japan last year also spurred an increase in heart-related ailments and pneumonia, according to a study.

The weekly figures for heart failure, the inability of the muscle to pump enough blood around the body, and pneumonia jumped soon after the earthquake, according to Japanese researchers who presented their findings today at the European Society of Cardiology meeting in Munich. The result was sustained for more than six weeks after the tsunami struck, compared with the previous three years, they said.

“The occurrence of heart failure and pneumonia significantly increased, then gradually went down to the previous level, though pneumonia took almost three months to go down,” Hiroaki Shimokawa, the lead researcher, told journalists in Munich. Cases of stroke, cardiopulmonary arrest and acute coronary syndrome, or symptoms of a blocked coronary artery such as a heart attack, also increased, Shimokawa said.

The findings add to the toll the natural disaster has had on Japanese health. The island nation, once ranked the No. 1 country for longevity for women and near the top for men, has fallen to sixth for women and eighth or ninth for men following the March 11, 2011, disaster, said Shimokawa, a cardiologist at Tohoku University Graduate School of Medicine in Sendai, Japan.

Destroyed Homes

Almost 16,000 people died following the earthquake and more than 3,000 went missing, the researchers said. About 390,000 homes were destroyed, as well as pharmacies and hospitals, they said. Suicides also rose, according to a government report released this year.

Radiation from the Fukushima nuclear plant may cause as many as 1,300 cancer deaths worldwide, according to a July study that showed fallout from Tokyo Electric Power Co.’s crippled reactors may be deadlier than predicted.

Shimokawa and his colleagues analyzed more than 120,000 ambulance transport records for the weeks before and after the earthquake. They also found that people’s blood pressure rose significantly.

When an aftershock of magnitude 7.0 hit on April 7, 2011, there was another jump in cases of stroke and cardiopulmonary arrest, the study found.

Blood Pressure

“Taken together, we consider that the discontinuation of drugs, activated sympathetic nervous system, rising blood pressure, and the increased occurrence of tachyarrhythmia and infections were all involved in the increased occurrence of cardiovascular events after the great earthquake,” Shimokawa said in a statement.

A spike in acute coronary syndrome would be expected following such a catastrophic event, because of an increase in stress hormones, said Spencer King, a professor emeritus at Emory University in Atlanta. Stress can prompt fatty desposits inside blood vessels to rupture, King, a past president of the American College of Cardiology, said in an interview in Munich. That could lead to clots that cause heart attacks and strokes.

While a short-term increase in cases of cardiovascular illnesses has been reported with previous earthquakes, the new study is the first to examine the longer-term effects on heart health, the researchers said. The data also provide the first evidence that the incidence of heart failure rose over a long period after the disaster, they said.

Heart Failure

Patients who stop taking their hypertension medications, for whatever reason, may develop heart failure, said Mariell Jessup, president-elect of the American Heart Association. An irregular heartbeat known as atrial fibrillation might also lead to heart failure, Jessup said. Symptoms include breathlessness and tiredness, and don’t usually prompt immediate medical attention in a crisis such as an earthquake, she said.

“If you’re looking for heart attacks, and someone says, ‘Oh, I’m short of breath,’ that might not jump out,” Jessup said in an interview in Munich. In addition to trauma preparations, people organizing disaster drills may want to incorporate ways to mobilize heart-care specialists to address cardiovascular illnesses, she said.

The Japanese research doesn’t indicate whether the people who experienced heart ailments already had cardiovascular disease, said Donna Arnett, the president of the American Heart Association.

“Everyone should be aware of the signs and symptoms of heart disease and stroke, and seek treatment” if those signs appear, Arnett said in an interview in Munich. “Once you have a condition, you should work toward improving everything you can control: diet, physical activity, not smoking. Engaging in healthy behavior gets you back on the road to recovery.”

To contact the reporter on this story: Kristen Hallam in London at khallam@bloomberg.net

To contact the editor responsible for this story: Phil Serafino at pserafino@bloomberg.net

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