[Incidence of cancer among children and adolescents (0-19 years) in Lazio Region (Central Italy), 2009-2015]. / Incidenza di tumori nella popolazione infantile e adolescenziale (0-19 anni) della Regione Lazio, anni 2009-2015.

OBJECTIVES: to investigate, for the first time, the incidence of cancer (years 2009-2015) and geographical distribution among children and adolescents with cancer diagnosis in Lazio Region (Central Italy). DESIGN: to compute incidence rates of childhood cancers from Lazio Region Childhood Cancer Registry (LRCCR) database, established in 2015, and to compare results with national figures for 2012 provided by the Italian cancer registries network (AIRTUM). SETTING AND PARTICIPANTS: all new cases of malignant tumours (behaviour: /3 of ICD-O-3 classification) and all central nervous system tumours were selected, regardless of behaviour (/0, /1, /3) in children and adolescents (0-19 years) registered in the LRCCR data base. MAIN OUTCOME MEASURES: it was computed: • the raw and the direct standardised rates for the 0-14-year and the 15-19-year age groups for total malignant tumours of the ICCC-3 classification by area (province level and municipality of Rome); • Relative Risks (RR) for area-specific rate compared with that of the Lazio Region and 95% Confidence Intervals (95%CI). RESULTS: a total of 1,782 incident cases were recorded in 2009-2015; of these, 91.4% were confirmed by a pathology report. Standardized Incidence Rate for all malignant tumours is 207.2×1,000,000 (95%CI 195.5-219.5) in children and 335.1×1,000,000 (95%CI 308.9-361.2) in adolescents. Compared to the Lazio Region, a higher incidence of tumours is observed in Rome municipality (RR 1.09; 95%CI 0.98-1.20) and in the Frosinone province (RR 1.07; 95%CI 0.91-1.25) for the whole 0-19-year age group. CONCLUSIONS: compared to the pooled AIRTUM figures for 2003-2008, Lazio Region showed a higher incidence for all cancers, both in children and adolescents, and for specific tumours, such as leukaemia in children and thyroid carcinoma in adolescents. Apart from the diverse observation period, these differences may be due to a higher registry sensitivity of the childhood specialized registry compared to general population registries. The observed incidence excesses for specific geographical areas and tumours deserve further investigations. Overall, in its first seven years of activity, the Lazio childhood cancer registry was able to provide reliable epidemiological figures of cancer incidence in children and adolescents in the Italian context.

A dose-response meta-analysis of chronic arsenic exposure and incident cardiovascular disease.

Background: Consistent evidence at high levels of water arsenic (≥100 µg/l), and growing evidence at low-moderate levels (<100 µg/l), support a link with cardiovascular disease (CVD). The shape of the dose-response across low-moderate and high levels of arsenic in drinking water is uncertain and critical for risk assessment. Methods: We conducted a systematic review of general population epidemiological studies of arsenic and incident clinical CVD (all CVD, coronary heart disease (CHD) and stroke) with three or more exposure categories. In a dose-response meta-analysis, we estimated the pooled association between log-transformed water arsenic (log-linear) and restricted cubic splines of log-transformed water arsenic (non-linear) and the relative risk of each CVD endpoint. Results: Twelve studies (pooled N = 408 945) conducted at high (N = 7) and low-moderate (N = 5) levels of water arsenic met inclusion criteria, and 11 studies were included in the meta-analysis. Compared with 10 µg/l, the estimated pooled relative risks [95% confidence interval (CI)] for 20 µg/l water arsenic, based on a log-linear model, were 1.09 (1.03, 1.14) (N = 2) for CVD incidence, 1.07 (1.01, 1.14) (N = 6) for CVD mortality, 1.11 (1.05, 1.17) (N = 4) for CHD incidence, 1.16 (1.07, 1.26) (N = 6) for CHD mortality, 1.08 (0.99, 1.17) (N = 2) for stroke incidence and 1.06 (0.93, 1.20) (N = 6) for stroke mortality. We found no evidence of non-linearity, although these tests had low statistical power. Conclusions: Although limited by the small number of studies, this analysis supports quantitatively including CVD in inorganic arsenic risk assessment, and strengthens the evidence for an association between arsenic and CVD across low-moderate to high levels.

Arsenic in Drinking Water and Mortality for Cancer and Chronic Diseases in Central Italy, 1990-2010.

BACKGROUND: In several volcanic areas of Italy, arsenic levels exceed European regulatory limits (10 µg/L in drinking water). There is still uncertainty about health risks from arsenic at low-medium doses (<100 µg/L). OBJECTIVES: A large population-based study using an administrative cohort of residents in the Viterbo province (Central Italy), chronically exposed to low-medium arsenic levels via drinking water, was investigated to evaluate the effects of a lifetime exposure to arsenic on mortality from cancers and chronic diseases. METHODS: The study population consisted of 165,609 residents of 17 municipalities, followed from 1990 until 2010. Average individual arsenic exposure at the first residence (AsI) was estimated through a space-time modeling approach using residential history and arsenic concentrations from water supply. A time-dependent Cumulative Arsenic dose Indicator (CAI) was calculated, accounting for daily water intake and exposure duration. Mortality Hazard Ratios (HR) were estimated by gender for different diseases using Cox proportional models, adjusting for individual and area-level confounders. A flexible non-parametric approach was used to investigate dose-response relationships. RESULTS: Mean AsI exposure was 19.3 µg/L, and average exposure duration was 39.5 years. Associations of AsI and CAI indicators with several diseases were found, with greatest risks found for lung cancer in both sexes (HR = 2.61 males; HR = 2.09 females), myocardial infarction, peripheral arterial disease and COPD in males (HR = 2.94; HR = 2.44; HR = 2.54 respectively) and diabetes in females (HR = 2.56). For lung cancer and cardiovascular diseases dose-response relationship is modelled by piecewise linear functions revealing effects even for doses lower than 10 µg/L, and no threshold dose value was identified as safe for health. CONCLUSIONS: Results provide new evidence for risk assessment of low-medium concentrations of arsenic and contribute to the ongoing debate about the threshold-dose of effect, suggesting that even concentrations below 10 µg/L carry a mortality risk. Policy actions are urgently needed in areas exposed to arsenic like in the Viterbo province, to comply with current EU regulations.

Effects of heat waves on mortality: effect modification and confounding by air pollutants.

BACKGROUND: Heat waves and air pollution are both associated with increased mortality. Their joint effects are less well understood. METHODS: We explored the role of air pollution in modifying the effects of heat waves on mortality, within the EuroHEAT project. Daily mortality, meteorologic, and air pollution data from nine European cities for the years 1990-2004 were assembled. We defined heat waves by taking both intensity and duration into account. The city-specific effects of heat wave episodes were estimated using generalized estimating equation models, adjusting for potential confounders with and without inclusion of air pollutants (particles, ozone, nitrogen dioxide, sulphur dioxide, carbon monoxide). To investigate effect modification, we introduced an interaction term between heat waves and each single pollutant in the models. Random effects meta-analysis was used to summarize the city-specific results. RESULTS: The increase in the number of daily deaths during heat wave episodes was 54% higher on high ozone days compared with low, among people age 75-84 years. The heat wave effect on high PM10 days was increased by 36% and 106% in the 75-84 year and 85+ year age groups, respectively. A similar pattern was observed for effects on cardiovascular mortality. Effect modification was less evident for respiratory mortality, although the heat wave effect itself was greater for this cause of death. The heat wave effect was smaller (15-30%) after adjustment for ozone or PM10. CONCLUSIONS: The heat wave effect on mortality was larger during high ozone or high PM10 days. When assessing the effect of heat waves on mortality, lack of adjustment for ozone and especially PM10 overestimates effect parameters. This bias has implications for public health policy.

A time series study on the effects of heat on mortality and evaluation of heterogeneity into European and Eastern-Southern Mediterranean cities: results of EU CIRCE project.

BACKGROUND: The Mediterranean region is particularly vulnerable to the effect of summer temperature.Within the CIRCE project this time-series study aims to quantify for the first time the effect of summer temperature in Eastern-Southern Mediterranean cities and compared it with European cities around the Mediterranean basin, evaluating city characteristics that explain between-city heterogeneity. METHODS: The city-specific effect of maximum apparent temperature (Tappmax) was assessed by Generalized Estimation Equations, assuming a linear threshold model. Then, city-specific estimates were included in a random effect meta-regression analysis to investigate the effect modification by several city characteristics. RESULTS: Heterogeneity in the temperature-mortality relationship was observed among cities. Thresholds recorded higher values in the warmest cities of Tunis (35.5°C) and Tel-Aviv (32.8°C) while the effect of Tappmax above threshold was greater in the European cities. In Eastern-Southern Mediterranean cities a higher effect was observed among younger age groups (0-14 in Tunis and 15-64 in Tel-Aviv and Istanbul) in contrast with the European cities where the elderly population was more vulnerable. Climate conditions explained most of the observed heterogeneity and among socio-demographic and economic characteristics only health expenditure and unemployment rate were identified as effect modifiers. CONCLUSIONS: The high vulnerability observed in the young populations in Eastern-Southern Mediterranean cities represent a major public health problem. Considering the large political and economic changes occurring in this region as well future temperature increase due to climate change, it is important to strengthen research and public health efforts in these Mediterranean countries.

Changes in the effects of heat on mortality among the elderly from 1998-2010: results from a multicenter time series study in Italy.

BACKGROUND: This multicenter study is aimed at estimating changes in the effect of high temperatures on elderly mortality before and after the 2003 heat waves and following the introduction of heat prevention activities. METHODS: A total of sixteen cities were included in the study. City-specific relationships between maximum apparent temperature (MAT) and elderly daily mortality before (1998-2002) and after (2006-2010) intervention were modelled through non-linear distributed lag models and estimates were combined using a random effect meta-analysis. We estimated the percentage change in daily mortality for 3°C variations in MAT above the 25th percentile of the June city-specific 1998-2002 distribution. A time-varying analysis was carried out to describe intra-seasonal variations in the two periods. RESULTS: We observed a reduction in high temperatures' effect post intervention; the greatest reduction was for increases in temperature from 9°C to 12°C above the 25th percentile, with a decrease from +36.7% to +13.3%. A weak effect was observed for temperatures up to 3°C above the 25th percentile only after. Changes were month-specific with a reduction in August and an increase in May, June and September in 2006-2010. CONCLUSIONS: A change in the temperature-mortality relationship was observed, attributable to variations in temperature distributions during summer and to the introduction of adaptation measures. The reduction in the effect of high temperature suggests that prevention programs can mitigate the impact. An effect of lower temperature remains, indicating a relevant impact of temperature at the beginning of summer when the population has not yet adapted and intervention activities are not fully operational.

The impact of heat waves on mortality in 9 European cities: results from the EuroHEAT project.

BACKGROUND: The present study aimed at developing a standardized heat wave definition to estimate and compare the impact on mortality by gender, age and death causes in Europe during summers 1990-2004 and 2003, separately, accounting for heat wave duration and intensity. METHODS: Heat waves were defined considering both maximum apparent temperature and minimum temperature and classified by intensity, duration and timing during summer. The effect was estimated as percent increase in daily mortality during heat wave days compared to non heat wave days in people over 65 years. City specific and pooled estimates by gender, age and cause of death were calculated. RESULTS: The effect of heat waves showed great geographical heterogeneity among cities. Considering all years, except 2003, the increase in mortality during heat wave days ranged from + 7.6% in Munich to + 33.6% in Milan. The increase was up to 3-times greater during episodes of long duration and high intensity. Pooled results showed a greater impact in Mediterranean (+ 21.8% for total mortality) than in North Continental (+ 12.4%) cities. The highest effect was observed for respiratory diseases and among women aged 75-84 years. In 2003 the highest impact was observed in cities where heat wave episode was characterized by unusual meteorological conditions. CONCLUSIONS: Climate change scenarios indicate that extreme events are expected to increase in the future even in regions where heat waves are not frequent. Considering our results prevention programs should specifically target the elderly, women and those suffering from chronic respiratory disorders, thus reducing the impact on mortality.

Surveillance of summer mortality and preparedness to reduce the health impact of heat waves in Italy.

Since 2004, the Italian Department for Civil Protection and the Ministry of Health have implemented a national program for the prevention of heat-health effects during summer, which to-date includes 34 major cities and 93% of the residents aged 65 years and over. The Italian program represents an important example of an integrated approach to prevent the impact of heat on health, comprising Heat Health Watch Warning Systems, a mortality surveillance system and prevention activities targeted to susceptible subgroups. City-specific warning systems are based on the relationship between temperature and mortality and serve as basis for the modulation of prevention measures. Local prevention activities, based on the guidelines defined by the Ministry of Health, are constructed around the infrastructures and services available. A key component of the prevention program is the identification of susceptible individuals and the active surveillance by General Practitioners, medical personnel and social workers. The mortality surveillance system enables the timely estimation of the impact of heat, and heat waves, on mortality during summer as well as to the evaluation of warning systems and prevention programs. Considering future predictions of climate change, the implementation of effective prevention programs, targeted to high risk subjects, become a priority in the public health agenda.

High temperature and hospitalizations for cardiovascular and respiratory causes in 12 European cities.

RATIONALE: Episode analyses of heat waves have documented a comparatively higher impact on mortality than on morbidity (hospital admissions) in European cities. The evidence from daily time series studies is scarce and inconsistent. OBJECTIVES: To evaluate the impact of high environmental temperatures on hospital admissions during April to September in 12 European cities participating in the Assessment and Prevention of Acute Health Effects of Weather Conditions in Europe (PHEWE) project. METHODS: For each city, time series analysis was used to model the relationship between maximum apparent temperature (lag 0-3 days) and daily hospital admissions for cardiovascular, cerebrovascular, and respiratory causes by age (all ages, 65-74 age group, and 75+ age group), and the city-specific estimates were pooled for two geographical groupings of cities. MEASUREMENTS AND MAIN RESULTS: For respiratory admissions, there was a positive association that was heterogeneous between cities. For a 1 degrees C increase in maximum apparent temperature above a threshold, respiratory admissions increased by +4.5% (95% confidence interval, 1.9-7.3) and +3.1% (95% confidence interval, 0.8-5.5) in the 75+ age group in Mediterranean and North-Continental cities, respectively. In contrast, the association between temperature and cardiovascular and cerebrovascular admissions tended to be negative and did not reach statistical significance. CONCLUSIONS: High temperatures have a specific impact on respiratory admissions, particularly in the elderly population, but the underlying mechanisms are poorly understood. Why high temperature increases cardiovascular mortality but not cardiovascular admissions is also unclear. The impact of extreme heat events on respiratory admissions is expected to increase in European cities as a result of global warming and progressive population aging.

Heat effects on mortality in 15 European cities.

BACKGROUND: Epidemiologic studies show that high temperatures are related to mortality, but little is known about the exposure-response function and the lagged effect of heat. We report the associations between daily maximum apparent temperature and daily deaths during the warm season in 15 European cities. METHODS: The city-specific analyses were based on generalized estimating equations and the city-specific results were combined in a Bayesian random effects meta-analysis. We specified distributed lag models in studying the delayed effect of exposure. Time-varying coefficient models were used to check the assumption of a constant heat effect over the warm season. RESULTS: The city-specific exposure-response functions have a V shape, with a change-point that varied among cities. The meta-analytic estimate of the threshold was 29.4 degrees C for Mediterranean cities and 23.3 degrees C for north-continental cities. The estimated overall change in all natural mortality associated with a 1 degrees C increase in maximum apparent temperature above the city-specific threshold was 3.12% (95% credibility interval = 0.60% to 5.72%) in the Mediterranean region and 1.84% (0.06% to 3.64%) in the north-continental region. Stronger associations were found between heat and mortality from respiratory diseases, and with mortality in the elderly. CONCLUSIONS: There is an important mortality effect of heat across Europe. The effect is evident from June through August; it is limited to the first week following temperature excess, with evidence of mortality displacement. There is some suggestion of a higher effect of early season exposures. Acclimatization and individual susceptibility need further investigation as possible explanations for the observed heterogeneity among cities.

Associations of area based deprivation status and individual educational attainment with incidence, treatment, and prognosis of first coronary event in Rome, Italy.

BACKGROUND: Socioeconomic gradients in the occurrence of myocardial infarction are well known, but few studies have examined socioeconomic disparities in post-infarction outcomes. The objective of this study was to explore relations of socioeconomic status with the incidence, treatment, and outcome of first coronary event in Rome, Italy, during the period 1998-2000, examining effect modification by gender. METHODS: Subjects were Rome residents aged 35-84 years who died from first acute coronary event before reaching the hospital (n=3470) or were hospitalised for first acute myocardial infarction (n=8467). Area based deprivation status and patients' educational attainment were the exposure variables. The outcomes were: incidence of coronary event; recanalisation at the index hospitalisation and fatality within 28 days of hospitalisation; cardiac readmissions and fatality between 28 days and one year of index hospitalisation. RESULTS: Incidence rates increased as area based deprivation status increased; the effect was stronger among women than among men (men RR=1.40, 95%CI:1.30, 1.50, women RR=1.78, 95%CI:1.60, 1.98, most compared with least deprived). Rates of recanalisation were significantly lower in the most deprived patients than in the least deprived (OR=0.77, 95%CI:0.59, 0.99) and in the less educated than in the highly educated (OR=0.73, 95%CI:0.58, 0.90). Associations of short term fatality with area based deprivation status and educational attainment were weak and inconsistent. However, neither deprivation status nor education was associated with one year outcomes. CONCLUSIONS: Area based deprivation status is strongly related to incidence of coronary events, and more so among women than among men. Deprivation status and educational attainment are weakly and inconsistently associated with short term fatality but seem not to influence one year prognosis of acute myocardial infarction. Deprived and less educated patients experience limited access to recanalisation procedures.

Ambient air pollution is associated with increased risk of hospital cardiac readmissions of myocardial infarction survivors in five European cities.

BACKGROUND: Ambient air pollution has been associated with increases in acute morbidity and mortality. The objective of this study was to evaluate the short-term effects of urban air pollution on cardiac hospital readmissions in survivors of myocardial infarction, a potentially susceptible subpopulation. METHODS AND RESULTS: In this European multicenter cohort study, 22,006 survivors of a first myocardial infarction were recruited in Augsburg, Germany; Barcelona, Spain; Helsinki, Finland; Rome, Italy; and Stockholm, Sweden, from 1992 to 2000. Hospital readmissions were recorded in 1992 to 2001. Ambient nitrogen dioxide, carbon monoxide, ozone, and mass of particles <10 microm (PM10) were measured. Particle number concentrations were estimated as a proxy for ultrafine particles. Short-term effects of air pollution on hospital readmissions for myocardial infarction, angina pectoris, and cardiac causes (myocardial infarction, angina pectoris, dysrhythmia, or heart failure) were studied in city-specific Poisson regression analyses with subsequent pooling. During follow-up, 6655 cardiac readmissions were observed. Cardiac readmissions increased in association with same-day concentrations of PM10 (rate ratio [RR] 1.021, 95% CI 1.004 to 1.039) per 10 microg/m3) and estimated particle number concentrations (RR 1.026 [95% CI 1.005 to 1.048] per 10,000 particles/cm3). Effects of similar strength were observed for carbon monoxide (RR 1.014 [95% CI 1.001 to 1.026] per 200 microg/m3 [0.172 ppm]), nitrogen dioxide (RR 1.032 [95% CI 1.013 to 1.051] per 8 microg/m3 [4.16 ppb]), and ozone (RR 1.026 [95% CI 1.001 to 1.051] per 15 microg/m3 [7.5 ppb]). Pooled effect estimates for angina pectoris and myocardial infarction readmissions were comparable. CONCLUSIONS: The results suggest that ambient air pollution is associated with increased risk of hospital cardiac readmissions of myocardial infarction survivors in 5 European cities.

A case-crossover analysis of out-of-hospital coronary deaths and air pollution in Rome, Italy.

RATIONALE: Out-of-hospital coronary heart disease death is a major public health problem, but the association with air pollution is not well understood. OBJECTIVES: We evaluated the association between daily ambient air pollution levels (particle number concentration [PNC]--a proxy for ultrafine particles [diameter < 0.1 microm], mass of particles with diameter less than 10 microm [PM10]; CO, NO2, and O3) and the occurrence of fatal, nonhospitalized coronary events. METHODS: Subjects were 5,144 out-of-hospital fatalities (410-414, International Classification of Diseases-9; 1998-2000) who had been residents of Rome. Hospitalizations during the 3 yr before death were considered to identify comorbidities (e.g., diabetes, hypertension, heart failure, dysrhythmia, chronic obstructive pulmonary disease). Statistical analyses were performed using a case-crossover design. MEASUREMENTS AND MAIN RESULTS: The association with out-of-hospital coronary deaths was statistically significant for PNC, PM10, and CO. Air pollution on the day of death had the strongest effect (e.g., 7.6% increase [95% confidence interval, 2.0-13.6%]) for an interquartile range of PNC, 27,790 particles/cm3. The 65-74- and 75+-yr age groups were at higher risk than the 35-64-yr age group, and there was a suggestion of effect modification for people with hypertension and chronic obstructive pulmonary disease. CONCLUSIONS: Air pollutants originating from combustion processes, including ultrafine particles, are related to fatal, nonhospitalized coronary events. The effect is stronger among people over 65 years of age, but is not limited to a group with a specific comorbidity.

[Air pollution and fatal and non fatal coronary events in Rome]. / Inquinamento atmosferico ed eventi coronarici fatali e non fatali a Roma.

OBJECTIVE: To examine the relationship between air pollution and coronary events in Rome in the period 1998-2000, considering both out-of-hospital deaths and hospitalisations. DESIGN: Time-series of daily counts of out-of-hospital deaths and hospitalised events, implementation of Generalised Additive Models. SETTING: The air pollutants taken into account were PNC (Particle Number Concentration--a measure of ultrafine particles), PM10, CO, NO2, SO2 and O3. The association was studied with respect to either single days or the cumulative effect on more consecutive days; furthermore, effect modification by age was tested (for the age groups 0-64, 65-74 and 75+). PARTICIPANTS: People resident of Rome and died/hospitalised for coronary causes into the city in the period 1998-2000. MAIN OUTCOME MEASURE: Association between pollutants and out-of-hospital deaths/hospitalised events. Distinction between fatal events (out-of-hospital deaths + hospitalisations with death within 28 days of admission) and non fatal events (hospitalisations with survival longer than 28 days). RESULTS: Significant association between PNC, PM10, and CO with out-of-hospital deaths, smaller effect on hospitalised events. For a variation of PNC of 28000 particles per cm3 (interquartile range of the distribution) the increase in the risk of out-of-hospital coronary death at lag 0 was 8.1%; for hospital admissions, the risk increased by 4%. The association was stronger in subjects older than 65, and was more evident for total fatal events than for non-fatal hospitalisations. CONCLUSION: The study showed increased risks of coronary events associated with air pollution in Rome: ultrafine particles, directly generated by vehicular traffic, are the environmental indicator which best characterizes the health risk.

[Estimates of pleural mesothelioma incidence in the Lazio region (Italy), 1997-2000]. / Stime di incidenza del mesotelioma pleurico nel Lazio, 1997-2000.

BACKGROUND: Malignant mesothelioma is indicative of past exposure to asbestos. In recent years an increase of incidence and mortality from malignant mesothelioma has been observed. Recent legislation in Italy requires nation-wide registration of asbestos-related pathologies. We conducted a preparatory study for systematic recording of cases of malignant pleural mesothelioma in the Lazio region. OBJECTIVES: To register new diagnoses of malignant mesothelioma, to estimate the incidence in the Lazio region, and to evaluate possible survey instruments. METHODS: We conducted a systematic study of hospital admissions in the region with diagnosis of cancer of the pleura (ICD-IX 163) in the period 1997-2000. Clinical information and results of diagnostic tests were requested for 530 patients from the hospitals involved. Using the capture-recapture method, it was possible to estimate the accuracy of the data we compiled using hospital admissions as the data source (76.8%, 95% C.I.=76.4-77.3). RESULTS: After careful review of clinical documentation, the diagnosis of malignant mesothelioma of the pleura was confirmed in 31.6% of cases (156 cases diagnosed). The percentage of confirmed cases has risen over the years (from 21% in 1997 to 45.1% in 2000) and it was higher in large public hospitals than in other types of health care facilities. On the basis of 156 confirmed cases of mesothelioma (116 males and 40 females), we estimated the annual incidence of the disease in the Lazio region as 1.73 new cases per 100,000 inhabitants among men and 0.47 new cases per 100,000 inhabitants among women. CONCLUSIONS: The results show that the incidence of mesothelioma in the region is consistent with national data, falling in the middle of the range for all Italian regions. However, some areas emerge (for example, Colleferro, Civitavecchia, Tarquinia, Ferentino, Gaeta, Aprilia, Pomezia) that have particularly high rates, probably in relation to past occupational asbestos exposure. The role of diffuse environmental exposure in Rome may warrant further investigation.

Air pollution and myocardial infarction in Rome: a case-crossover analysis.

BACKGROUND: Daily air pollution is associated with increased hospital admissions for cardiovascular diseases, but there are few observations on the link with acute myocardial infarction. To evaluate the relation between various urban air pollutants (total suspended particulate, SO2, CO, NO2) and hospital admissions for acute myocardial infarction in Rome, Italy, we performed a case-crossover analysis and studied whether individual characteristics act as effect modifiers. METHODS: We studied 6531 subjects residing in Rome and hospitalized for a first episode of acute myocardial infarction (International Classification of Diseases, 9th edition: 410) from January 1995 to June 1997. The following individual information was available: sex, age, date of hospitalization, coexisting illnesses (hypertension, 25%; diabetes, 15%), and cardiac severity (conduction disorders, 6%; cardiac dysrhythmias, 20%; heart failure, 11%). Daily air pollution data were taken from 5 city monitors. We used a time-stratified case-crossover design; control days were the same day of the week as the myocardial infarction occurred, in other weeks of the month. RESULTS: Positive associations were found for total suspended particulate, NO2 and CO. The strongest and most consistent effect was found for total suspended particulate. The odds ratio (OR) associated with 10 micro g/m3 of total suspended particulate over the 0- to 2-day lag was 1.028 (95% confidence interval [CI] = 1.005-1.052). The association with total suspended particulate tended to be stronger among people older than 74 years of age (OR = 1.046; CI = 1.005-1.089), in the warm period of the year (OR = 1.046; CI = 1.008-1.087), and among subjects who had heart conduction disorders (OR = 1.080; CI = 0.987-1.181). CONCLUSIONS: The results suggest that air pollution increases the risk of myocardial infarction, especially during the warm season. There was a tendency for a stronger effect among the elderly and people with heart conduction disturbances.

[Underreporting of AIDS cases in Lazio, Italy]. / Sottonotifica dei casi di AIDS nel sistema di sorveglianza del Lazio.

One of the most important aspect of any surveillance system is completeness. We conducted an evaluation of the completeness of the AIDS surveillance system (SSAIDS) of Lazio region. We estimated the underreporting of AIDS cases in SSAIDS of Lazio in the period 1996-1998 through a linkage with the regional Hospital Information System (HIS) for the same years. A logistic regression model was used to estimate the relative risk (Odds Ratios--OR) of being unreported by demographic and clinical characteristics. A total of 56 cases had not been reported in the period 1996-1998, corresponding to 3.6% of underreporting. The risk of not being reported was associated with undetermined value of CD4 at diagnosis of AIDS (OR 15.40), unknown modality of exposure (OR 3.15) and with AIDS defining illness at diagnosis (ADI) as mycobacteriosis (OR 11.65), encephalopaties (OR 4.47) and toxoplasmosis (OR 8.67). Differences were also observed by clinical centre of diagnosis. In conclusion, the degree of underreporting is lower in our region than in other countries and the SSAIDS has a high completeness in Lazio. In agreement with other studies, underreporting is more frequent for cases with undermined value of CD4 at diagnosis of AIDS and unknown modality of exposure. The results regarding ADI need further investigation.