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Colombia Médica

On-line version ISSN 1657-9534

Colomb. Med. vol.51 no.2 Cali Apr./June 2020  Epub May 11, 2020

https://doi.org/10.25100/cm.v51i2.4270 

Article Review

Mortality from respiratory infections and chronic non-communicable diseases before the COVID-19 pandemic in Cali, Colombia

Luis Eduardo Bravo1  2 
http://orcid.org/0000-0002-9708-0312

Paola Collazos1 
http://orcid.org/0000-0002-4570-2087

Elvia Karina Grillo Ardila1  3 

Luz Stella García1 
http://orcid.org/0000-0002-8108-1855

Erquinovaldo Millan4 

Patricia Mera4 

Jorge Holguín4 

1 Registro Poblacional de Cáncer de Cali. Cali, Colombia.

2 Universidad del Valle, Facultad de Salud, Departamento de Patología, Cali, Colombia.

3 Universidad del Valle, Facultad de Salud, Doctorado en Salud. Cali, Colombia.

4 Secretaria de Salud Pública Municipal de Cali, Cali, Colombia.


Abstract

Introduction:

The COVID-19 disease pandemic is a health emergency. Older people and those with chronic noncommunicable diseases are more likely to develop serious illnesses, require ventilatory support, and die from complications.

Objective:

To establish deaths from respiratory infections and some chronic non-communicable diseases that occurred in Cali, before the SARS-CoV-2 disease pandemic.

Methods:

During the 2003-2019 period, 207,261 deaths were registered according to the general mortality database of the Municipal Secretary of Health of Cali. Deaths were coded with the International Classification of Diseases and causes of death were grouped according to WHO guidelines. Rates were standardized by age and are expressed per 100,000 people-year.

Results:

A direct relationship was observed between aging and mortality from respiratory infections and chronic non-communicable diseases. Age-specific mortality rates were highest in those older than 80 years for all diseases evaluated. Seasonal variation was evident in respiratory diseases in the elderly.

Comments:

Estimates of mortality rates from respiratory infections and chronic non-communicable diseases in Cali provide the baseline that will serve as a comparison to estimate the excess mortality caused by the COVID-19 pandemic. Health authorities and decision makers should be guided by reliable estimates of mortality and of the proportion of infected people who die from SARS-CoV-2 virus infection.

Keywords: COVID-19; chronic diseases; mortality from respiratory infections

Resumen

Introducción:

La pandemia de la enfermedad COVID-19 es una emergencia sanitaria. Las personas mayores y aquellos con enfermedades crónicas no trasmisibles tienen más probabilidades de desarrollar enfermedades graves, requerir soporte ventilatorio y morir a causa de las complicaciones.

Objetivo:

Establecer las defunciones por infecciones respiratorias y por algunas enfermedades crónicas no trasmisibles ocurridas en Cali, antes de la pandemia de la enfermedad por el SARS-CoV-2.

Métodos:

Durante el periodo 2003-2019, se registraron 207,261 defunciones información obtenida de la base de datos de mortalidad general de la Secretaria de Salud Municipal de Cali. Las defunciones se codificaron con la Clasificación Internacional de Enfermedades y las causas de muerte se agruparon según las guías de la OMS. Las tasas se estandarizaron por edad, son expresadas por 100,000 personas-año.

Resultados:

Se observó una relación directa entre envejecimiento y la mortalidad por infecciones respiratorias y enfermedades crónicas no trasmisibles. Las tasas de mortalidad específicas por edad fueron más altas en los mayores de 80 años para todas las enfermedades evaluadas. En las enfermedades respiratorias fue evidente una variación estacional en los ancianos.

Comentario:

Las estimaciones de las tasas de mortalidad por infecciones respiratorias y enfermedades crónicas no trasmisibles para Cali proporcionan la línea de base que servirá de comparación para estimar el exceso de mortalidad que ocasionará la pandemia de COVID-19. Las autoridades sanitarias y los tomadores de decisiones deben guiarse por estimaciones fiables de la mortalidad y de la proporción de infectados que mueren por la infección del virus SARS-CoV-2.

Palabras clave: COVID-19; enfermedades crónicas; mortalidad por infecciones respiratorias

Remark

1)Why was this study conducted?
To provide a robust baseline of the number of deaths that occurred in Cali, prior to the SARS-CoV-2 pandemic caused by respiratory infections diseases and some chronic non-communicable diseases (respiratory diseases, cardiovascular diseases, cancer, and diabetes mellitus). It allows estimating the excess of mortality caused by the SARS-CoV-2/COVID-19 pandemic.
2) What were the most relevant results of the study?
Noncommunicable chronic diseases caused 76% of the 65,906 deaths that occurred in Cali during the five-year period 2015-2019; 22% of these deaths were caused by cancer. In respiratory diseases, a more evident seasonal variation was observed in the elderly.
3) What do these results contribute?
A method that can be used in other regions or cities. Knowing the mortality rates, their temporal trend and the frequency distribution of deaths in Cali before the pandemic, will allow modeling excess mortality to determine the real impact of the SARS-CoV-2/COVID-19 pandemic.

Introduction

The COVID-19 disease pandemic is a global health emergency caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first human case of this disease occurred in late 2019 and in four months it spread to almost every country in the world 1,2.

The majority of the COVID-19 infected population experiences mild to moderate respiratory disease and recovers without requiring special treatment. Older people and those with underlying medical problems such as chronic non-communicable diseases (cardiovascular, diabetes, chronic respiratory diseases, and cancer) are more likely to develop serious diseases, require ventilatory support, and die from complications 3-7.

The actual number of deaths from SARS-CoV-2/COVID19 is underestimated because hospitals, medical providers, and health authorities are reporting only confirmed cases. The effective number of deaths caused by the SARS-CoV-2 virus will only be evident after statistically modelling excess mortality during the period that this pandemic last.

Through collaborative inter-institutional work between the Municipal Public Health Secretary, the Hospital Registries of Cali, the epidemiological surveillance system for childhood cancer VIGICANCER and the Population Cancer Registry of Cali, the behavior of cancer patients will be monitored to see the impact of the COVID-19 pandemic. The objective is to establish the baseline to calculate excess mortality during the SARS-Cov-2 pandemic. The method can be used in other regions or cities that have registries and observatories of chronic non-communicable diseases and cancer.

Materials and Methods

Cali is the capital of Valle del Cauca Department and the third largest city in Colombia. According to the 2018 census and according to DANE projections, the estimated population for 2023 is 2.3 million inhabitants of which 54% will be women 8,9. Of the total population of Cali, 26.2% recognize themselves as belonging to the black ethnic group 10. Life expectancy at birth is 74.4 years old 11 with gender distribution of 82.7 for women and 77.4 for men 12. The infrastructure for cancer care has 165 authorized cancer services 13. These services are found in the urban area where 95% of the population lives. That population lives in an area of 110 km2, which corresponds to 20% of the extension of the municipality of Cali (503 km2).

Information on the number of deaths, by basic cause from January 2003 to February 2020, was obtained from the general mortality database of the Municipal Health Secretariat of Santiago de Cali. The methods for its epidemiological registration have been previously described 10,14. The International Classification of Diseases (ICD-10) 15 was used to code deaths, and following the guidelines of the World Health Organization (WHO) 16) the causes of death were grouped into three major groups of diseases: communicable, chronic, non-communicable and injuries; the rubrics of each category are detailed in Table 1.

Table 1 Abbreviated list of basic cause of death using Global Health Estimation (GHE) categories and ICD-10 codes 

GHE code GHE Name cause ICD-10 code
10 I. Communicable, maternal, perinatal and nutritional conditions A00-B99, D50-D53, D64.9, E00-E02, E40-E46, E50-E64, G00-G04, G14, H65-H66, J00-J22, N70-N73, O00-O-99, P00-P96, U04
380 B. Respiratory infectious H65-H66, J00-J22, P23, U04
600 II. Non-communicable diseases C00-C97, D00-D48, D55-D64 (menos D 64.9), D65-D89, E03-E07, E10-E34, E65-E88, F01-F99, G06-G98 (menos G14),H00-H61, H68-H93, I00-I99, J30-J98, K00-K92, L00-L98, M00-M99, N00-N64, N75-N98, Q00-Q99, X41-X42, X44,X45, R95
610 A. Malignant neoplasms C00-C97
800 C. Diabetes mellitus E10-E14 (minus E10.2-E10.29, E11.2-E11.29, E12.2, E13.2-E13.29, E14.2)
1100 H. Cardiovascular diseases I00-I99
1170 I. Respiratory diseases J30-J98
1510 III. Injuries V01-Y89 (minus X41-X42, X44, X45)
1520 A. Unintentional injuries V01-X40, X43, X46-59, Y40-Y86, Y88, Y89
1600 B. Intentional injuries X60-Y09, Y35-Y36, Y870, Y87

Source: WHO methods and data sources for country‐level causes of death 2000‐2015. Global Health Estimates, Department of Information, Evidence and Research, January 2017. WHO, Geneva Technical Paper WHO/HIS/IER/GHE/2016.3 16

Deaths from respiratory infections and chronic non-communicable diseases associated with fatal outcome during the COVID-19 pandemic (malignancies, diabetes mellitus, and cardiovascular and respiratory diseases) were included in the analysis. The structure of the population by five-year age groups for each calendar year was obtained from the National Administrative Department of Statistics of Colombia (DANE) 17. Mortality rates for the entire population were age-standardized (ASR) by the direct method using the world standard population as a reference. Global and age-specific rates are expressed per 100,000 people-years. The trend in mortality rates between 2003 and 2009 was described using the Annual Percent Change (APC), calculated using the weighted least squares method 18. To detect seasonal changes, monthly mortality rates were estimated during the 206 months evaluated (January 2003 to February 2020).

Results

During the period 2003-2019 there were 207,261 deaths and 65,906 in the five-year period 2015-2019, with the following distribution of frequencies: Communicable diseases (7,249; 11.0%), chronic non-communicable diseases (50,121; 76.0%), and injuries (8,536; 13.0 %). For the diseases included in the analysis, the frequency distribution was as follows: Respiratory infections (6.1%), respiratory diseases (5.4%), cancer (22.3%), diabetes (2.6%) and cardiovascular disease (30.1%).

The average annual mortality rate per 100,000 people-year for all causes of death was higher among men (568) than among women (322). Excess mortality could be explained by chronic non-communicable diseases such as malignant neoplasms and cardiovascular diseases, and by intentional injuries (Table 2).

Table 2 Cali, Colombia. Mortality rates per 100,000 people-year, by sex and basic cause of death during the 2015-2019 period. 

Cause of death Both Men Women
Rate n % Rate n % Rate n %
I. Communicable, maternal, perinatal and nutritional conditions 50.4 7,249 11.0 66.7 3,957 11.2 37.8 3,292 10.8
Respiratory infectious 24.6 3,994 31.2 1,967 20.0 2,027
Others 25.8 3,255 35.5 1,990 17.8 1,265
II. Non-communicable diseases 312.9 50,121 76.0 380.8 24,007 68.0 268.0 26,114 85.4
Malignant neoplasms 96.7 14,681 110.8 6,904 88.5 7,777
Mellitus diabetes 10.8 1,712 12.8 810 9.3 902
Cardiovascular diseases 118.0 19,821 150.0 9,608 95.8 102,133
Respiratory diseases 20.4 3,588 27.4 1,776 15.9 1,812
Others 67.0 6,325 79.8 4,909 58.5 3,303
III. Injuries 66.7 8,536 13.0 121.1 7,350 20.8 16.3 1,186 3.9
Unintentional injuries 19.7 2,706 32.3 1,969 9.2 737
Intentional injuries 47.0 5,830 88.9 5,381 7.0 449
Total 429.6 65,906 568 35,314 322 30,592

Source: WHO methods and data sources for country‐level causes of death 2000‐2015. Global Health Estimates, Department of Information, Evidence and Research, January 2017. WHO, Geneva Technical Paper WHO/HIS/IER/GHE/2016.3 16

The mortality rates from chronic non-communicable diseases in the five-year period (2015-2019) were like those in 2019 (Table 4-Suppl); however, mortality rates from communicable diseases and injuries were lower in 2019 compared to those observed in the five-year period (2015-2019) (Table 2).

Figure 1 shows that the risk of dying is directly associated with aging and that mortality rates from cardiovascular diseases remained stable in people older than 65 years old. In contrast, a significant decrease in the risk of dying was observed between 2003 and 2019 among those younger than 65 and in all age groups, related to respiratory diseases and diabetes mellitus. The magnitude of the decrease was greater in the group of 50-64 years old. Influenza and pneumonia death rates decreased significantly in children younger than 5 years old and remained stable in the other age groups.

APC: Annual Percent; CI: 95% confidence interval during the study period (17 years). * APC is significantly different from zero (0)

Figure 1 Cali, Colombia. Trend in age-specific mortality rates for some selected categories during the period 2003-2019. Mortality rates are expressed per 100,000 people per year. 

Figure 2 shows the temporal variation of the monthly age-specific mortality rates for the respiratory diseases group and the monthly variations of the global rates for the cardiovascular disease, cancer and diabetes mellitus groups. Age-specific rates were highest in those older than 80 years for all diseases evaluated. In the group of respiratory diseases, influenza and pneumonia, there was more evident seasonal variation in the elderly and with few exceptions, the peaks occurred between the months of October and January.

Figure 2 Cali, Colombia. Changes in monthly general and age-specific mortality rates for respiratory infections and selected chronic non-communicable diseases between January 2003 and February 2020. In deaths from respiratory diseases (influenza and pneumonia), the monthly mortality rates per 100,000 people-year show seasonal variation and with few exceptions, the peaks occurred between October and January. 

Discussion

Estimates of the magnitude and temporal trend of mortality rates from respiratory infections and chronic non-communicable diseases for the entire population of Cali over three five-year periods, provide a robust baseline that will serve as a comparison to estimate the excess mortality caused by COVID-19 pandemic. Seasonal variations in mortality were evident in the group of older adults suggesting that this section of the population bears the heaviest burden in terms of the severity of seasonal influenza. Patients suffering from COVID-19 that have the highest risk of death are those of advanced age and with the presence of pre-existing conditions such as diabetes mellitus, cardiovascular diseases, cancer, hypertension and smoking. The impact of the disease on them can be measured by the case fatality rate (CFR) 19.

Properly classifying the causes of death during the COVID-19 pandemic is an emerging challenge. It is imperative that health authorities and decision makers be guided by reliable estimates of mortality and IFC. This index measures the proportion of infected people who die from SARS-CoV-2 virus infection. An accurate count of the number of deaths due to COVID-19 depends in part on proper completion of the death certificate 20. When a patient suffering from COVID-19 dies, it is likely that this disease is the basic cause of death, even in patients with comorbidities such as chronic, non-communicable diseases, which are contributing causes, but are not part of the causal sequence.

The COVID-19 CFR shows the pattern of an emerging infectious disease. At the beginning of the disease and when first cases are described, CFR is high and then decreases as the pandemic progresses. The denominator of the CFR in the COVID-19 pandemic is variable and closely related to the control policies implemented by regional and/or national health authorities 19. A major challenge in accurately calculating IFC is the denominator: the number of people infected with the virus. Asymptomatic cases of COVID-19, patients with mild symptoms, or individuals misdiagnosed (false negatives) could be left out of the denominator, leading to underestimation of the number of infected and an overestimation of CFR 19.

CFR depends on the number of tests performed to detect people with COVID-19 disease. The countries that achieved control of the pandemic have a higher denominator and a lower CFR because at the beginning of the pandemic they invested resources in mass analysis with intensive tracing of cases and tests on contacts, without limiting themselves to seriously ill patients. Their proposals included the implementation of extreme social isolation, localized quarantines, and follow-up monitoring of suspected cases, even in vulnerable populations, to contain the spread. In contrast, countries that did not exercise control measures for the pandemic have a lower denominator and a high CFR because in the presence of dozens of infections and multiple possible asymptomatic cases, confirmatory laboratory tests for the virus were reserved for patients with severe symptoms 20. The lack of opportunity in the implementation of containment measures led these countries and cities to a collapse in health services due to the avalanche of critical cases, the inadequate operation of local laboratories, damming of samples, and a shortage of mechanical ventilators and health personal. In addition, they have also demonstrated a lack of diagnostic capacity that has made it impossible to truly know the dimension and impact of the disease.

The national percentage of duly certified deaths in Colombia is 93.7% (21. To guarantee the validity of the estimates of excess mortality caused by COVID-19, it is a priority to standardize the basic cause of death during the pandemic. The WHO used the international disease classification (IDC) and assigned emergency headings U07.1 and U07.2 to deaths from SARS-CoV-2 infection confirmed by laboratory and clinically and epidemiologically diagnosed, respectively. Codes U00-U49 are used by WHO for the provisional allocation of new diseases of uncertain aetiology. In emergency situations, codes are not always accessible in electronic systems. Specification of category U07 in the manner in which it is done in Table 3 will ensure that this category and its subcategories are available in all electronic systems at any time and that they can be used immediately according to WHO instructions 22.

Table 3 World Health Organization (WHO). Rubrics added to the International Classification of Diseases. ICD-10 for suspected cases of COVID-19. March 2020. 

Instruction Entries to the tabular list
Add exclusion Notes B34.2 Coronavirus infection, site unspecified Excludes:
COVID-19, with virus identification (U07.1)
COVID-19, without virus identification (U07.2)
Add exclusion Notes U04.9 Severe acute respiratory syndrome (SARS), unspecified Excludes:
COVID-19, with virus identification (U07.1)
COVID-19, without virus identification (U07.2)
U07.0
U07.1 COVID-19, identified virus Use this code when the virus has been identified by laboratory tests,
regardless of the severity of clinical signs and symptoms. Excludes:
Coronavirus infection, site unspecified
Severe acute respiratory syndrome (SARS), unspecified (U04.9)
U07.2 COVID-19, unidentified virus
Use this code when the diagnosis of COVID-19 is clinical or epidemiological and the diagnostic test is inconclusive or unavailable. COVID-19 NOS

Source: WHO, codification of COVID-19 with ICD-10, 2020 (22)

The collapse of health systems and even funeral services and the fear of becoming ill can contribute to all deaths occurring outside the hospital setting, as well as that of any symptomatic respiratory patient without confirmatory test, being directly attributed to SARSCov-2/COVID-19. This current problem facilitates the production of cases of poor classification when registering the causes of death in death certificates. This will cause a trend that may suggest a false decrease in mortality rates attributable to chronic non-communicable diseases, specifically those related to cancer.

Comments

The massification of diagnostic tests, the reduction in response time and the mapping of serious respiratory infections are the main strategies used by developed countries to slow down the spread of the disease. In countries where hundreds of deaths are recorded daily, where there are no diagnostic tests, and in those where the fear of being infected is greater, it is impossible for health sectors to accurately diagnose the cause of death.

Knowing the mortality rates, their time trend and the frequency distribution of deaths in Cali before the pandemic, will allow modelling excess mortality to determine the real impact of the disease.

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Funding: This investigation was financed by Universidad del Valle and partially by Univalle-Vandervilt University-NIH-USA (Prime Award No.2 P01 CA028842, Subaward No. VUMC3239) enrolled in the Universidad del Valle Information Centre: 1641.

Anexo

Table 4 Cali, Colombia. Number of deaths, and age-standardized death rates by sex, 2019 

Causes of death Both Male Female
Rate* n % Rate* n % Rate* n %
I. Communicable, maternal, perinatal and nutritional condition 44.0 1,392 10.1 59.7 770 10.5 32.2 622 9.7
Respiratory infections 23.3 793   29.7 391   19.2 402  
Other 20.7 599   30.0 379   13.0 220  
II. Noncommunicable diseases 312.9 10,676 77.8 388.7 5,140 70.2 265.7 5,536 86.7
Malignant neoplasms 94.6 3,097   107.5 1,422   87.7 1,675  
Diabetes mellitus 10.6 357   13.8 182   8.5 175  
Cardiovascular diseases 120.4 4,251   158.4 2,106   95.4 2,145  
Respiratory diseases 20.4 756   27.7 371   15.8 385  
Other 66.9 2,215   81.3 1,059   58.3 1,156  
II. Injuries 59.9 1,648 12.0 108.3 1,417 19.3 14.8 231 3.6
Unintentional injuries 18.0 529   29.6 384   8.7 145  
Intentional injuries 41.8 1,119   78.8 1,033   6.2 86  
Total 415.9 13,716 100.0 555.4 7,327 100.0 312.2 6,389 100.0

Fuente: Secretaria de Salud Publica Municipal de Santiago de Cali

Tasas expresadas por 100,000 personas-año

La tasa de mortalidad estandarizada por edad es un promedio ponderado de la tasa de mortalidad edad especifica por 100,000 personas, donde los pesos son las proporciones de las personas en el correspondiente grupo de edad de la población estándar Segui

Corresponding author: Luis Eduardo Bravo, Director Registro Poblacional de Cáncer de Cali. Calle 4B 36-00 Edificio 116 Oficina 4009, Cali, Colombia. E-mail:luis.bravo@correounivalle.edu.co

Conflicts of interest:

None declared

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