Read the following pasage and mark the letter A, B, C or D
on your answer sheet to indicate the correct answer to each of the questions
As heart disease continues to be the number-one killer in
the United States, researchers have become increasingly interested in
identifying the potential risk factors that trigger heart attacks. High-fat
diets and "life in the fast lane" have long been known to contribute
to the high incidence of heart failure. But according to new studies, the list
of risk factors may be significantly longer and quite surprising.
Heart failure, for example, appears to have seasonal and temporal patterns. A higher percentage of heart attacks occur in cold weather, and more people experience heart failure on Monday than on any other day of the week. In addition, people are more susceptible to heart attacks in the first few hours after waking. Cardiologists first observed this morning phenomenon in the mid-1980, and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 A.M. and 10:00 A.M.
In other studies, both birthdays and bachelorhood have been
implicated as risk factors. Statistics reveal that heart attack rates increase
significantly for both females and males in the few days immediately preceding
and following their birthdays. And unmarried men are more at risk for heart
attacks than their married counterparts. Though stress is thought to be linked
in some way to all of the aforementioned risk factors, intense research
continues in the hope of further comprehending why and how heart failure is
triggered .
What does the passage mainly discuss?
Cardiology in the 1980s
Diet and stress as factors in heart attacks
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