Study on Freeway Links Exhaust Fumes to Angina
Dr W S Aronow, Long Beach, Calif, VA Hosp cardiologist, repts 'compelling evidence' that small amts of carbon monoxide from automobile exhaust aggravate angina pectoris, rept in Annals of Internal Med; describes experiment in which 10 men with heart disease were driven through heavy morning Los Angeles freeway traffic; drs periodically measured volunteers' heart rate and blood pressure and recorded their electrocardiograms during drive; men developed raised blood levels of carbon monoxide, slower heart rates, lower blood pressure, decreased lung functions and poorer exercise performances; when same men breathed purified instead of polluted air while driving over same route, their condition did not worsen; study has implications for all healthy people exposed to air pollution; Calif State Health Dept air pollution expert Dr J R Goldsmith says findings suggest that no threshhold exists before carbon monoxide affects heart disease patients; says that possibly 'badly ventilated heating and cooking stoves may also produce such ex-posures in home'; Aronow advises patients with known heart disease to avoid smoke-filled rooms and public places where smoking is permitted and to alter their commuting schedules to avoid rush-hr traffic and peak levels of carbon monoxide