reminiscences from Indian Pediatrics: A tale
of 50 years |
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Indian Pediatr 2016;53:
242-243 |
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Perinatal Mortality- What has Changed?
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* Sharmila B Mukherjee and
#Tapas Bandyopadhyay
From the Departments of *Pediatrics and #Neonatology, Lady Hardinge
Medical College, New Delhi, India.
Email: [email protected]
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The
March 1966 issue of Indian Pediatrics published three
observational studies (on perinatal mortality, intrapleural
hydrocortisone instillation in pleural effusion and serum protein
fractions in whooping cough), a case series (cholecystistis mimicking
latent rheumatism) and regular items such as Current literature, News
and Announcements. For this write-up, we shall be reviewing the
observational study on perinatal mortality by Bajpai, et al. [1].
The Past
The scientific paper being reviewed for this
write-up is a prospective observational study conducted at Queen Mary’s
Hospital, Lucknow in 1964 to determine the incidence of perinatal
mortality and identify possibly responsible medical, biological and
socio-economic causes. During the study duration (5.5 months), the
outcomes of 1000 consecutive viable births and 114 perinatal deaths were
studied. Maternal details, test results in the case of stillborns
(Wassermann reaction, VDRL, blood sugar, urea, Rh typing), pediatric
data, and autopsy findings (whenever feasible) were analyzed. The
Aberdeen classification system, developed by Sir Dugald Baid in 1954,
was used for determining etiology of stillbirths [2]. The incidence of
perinatal loss was found to be 114/1000 births. Although only 38.2%
cases were unbooked, they accounted for 93% of the perinatal deaths; a
large number of them having being referred as ‘complicated’ once labour
had started. Significantly higher perinatal loss was associated with
maternal variables like low socio-economic strata (76%), maternal age
³35 years
(36.5%), and parity >3 (82.7%). It was also significantly higher in
babies with birth weights below 2500 g, twins and abnormal
presentations.
Analysis of 114 perinatal deaths revealed antenatal
causes in 42%, intra-natal causes in 34.2%, post-natal causes in 5.3%
and unknown causes in 13.2%. In the analysis of stillbirths (n=71),
it was observed that 42% were due to antenatal causes, 42% intra-natal
causes, and 16% unknown causes. Maternal disease was the commonest
antenatal cause (21%), that included anemia, pregnancy induced
hypertension and antepartum hemorrhage in descending order of frequency.
Trauma and asphyxia were the commonest causes of intra-natal death. The
majority (79%) of neonatal deaths (n=43) were in premature
babies, which were defined by low birth weight (<2.5 kg) rather than
gestation according to the existing international standards in that era.
Main causes of early neonatal death were prematurity (48.9%), asphyxia
(18.7%), congenital defects (13.9%) and respiratory distress syndrome
(11.6%). The autopsy reports of 21 neonates (14 stillbirth and 7
neonatal) demonstrated anoxia as the commonest finding (52.3%) followed
by pulmonary lesions (23.9%), congenital malformations (14.2%) and
maceration (4.8%).
The study findings were compared with available data
from other hospitals. Perinatal mortality rate (PMR; per thousand
births) ranged from 61.5 (Hyderabad) to 161 (Bombay) in India, and 13.8
(London) to 38.6 (Aberdeen) in the United Kingdom. The causes were
similar in the Indian studies, however differed from the developed
countries. When this data was compared with statistics from the same
hospital ten years ago (1954), it was observed that PMR decreased from
131.2 to 114 per thousand births, primarily due to reduction in early
neonatal deaths. The authors concluded that most of the causes of
perinatal mortality were preventable and that this could be decreased by
improving socio-economic conditions, providing adequate antenatal care,
improving maternal nutrition, creating effective and early referral
systems from the periphery to tertiary hospitals and improving early
neonatal care.
Historical background and past knowledge: The
term ‘perinatal mortality’ was coined by Peller in 1940s [3]. This
denoted the number of stillborns and deaths occurring from the 28th
completed week of pregnancy till the end of the first week of life. It
was believed that similar pathological processes were responsible for
both in utero and early neonatal deaths. Even at that time, it
was recognized that besides causing immense social and economic loss,
perinatal mortality could be used as an indicator of a country’s health
care status. In those days, national perinatal mortality surveys had
started being conducted in developed countries. These had resulted in
the identification of multiple contributory factors (obstetric,
pediatric, pathological and social). The few existing Indian studies
were hospital-based due to absence of a reliable national registry.
The Present
Immense progress has been made in the understanding
of perinatal mortality over the last 50 years. Nowadays, collection,
compilation, analysis and dissemination of reliable and standardized
perinatal data are considered pillars of developing optimal quality
perinatal care. The lower limit defining the perinatal period has kept
changing, parallel to better fetal viability resulting from advances in
neonatology. Nevertheless, there is still considerable inter- and
intra-country variability (ranging from 22 to 28 weeks of gestation) in
these definitions. To maintain uniformity, the World Health Organization
defines a stillbirth as death of a fetus of birth weight
£1000 g, gestational
age £28
completed weeks (if weight unknown) or crown-heel length
£35 cm (if both
criteria unknown) [4].
Over last 50 years, several systems have emerged to
classify causes and associated conditions of perinatal deaths. The main
objectives are to enable comparison, help in health surveillance,
improve quality of care by focusing on modifiable factors, and generate
research [5]. Systems that work well in developed countries may not
necessarily be effective in developing countries, for instance ‘Cause of
death and associated conditions (CODAC)’ performs much better in
developed countries, as it relies primarily on autopsy findings and
placental histopathology. In contrast, the ‘Extended Wigglesworth
classification’ that is considered inferior in the West is used in most
Indian centers because it is simple, clinical-based, does not require an
autopsy, and has clear implications for clinical management [6].
Almost 55 years after national registries were
developed in Scotland, the Indian National Neonatology Forum launched
the National Neonatal-Perinatal Database initiative in 1995. In 2004,
the program ‘Save the Children’s Saving Newborn Lives’ was initiated
which amongst other activities, periodically releases ‘State of India’s
newborns (SOIN)’ reports [7]. According to the 2014 report, the national
PMR is 28/1000 (still-births 5/1000, early neonatal 23/1000) with marked
inter-state variability (e.g. Kerala 10/1000 and Odisha 37/1000).
The currently prevalent maternal factors resulting in increased
perinatal loss include adolescent pregnancies, maternal undernutrition,
poor socioeconomic status, iron-deficiency anemia and other
micro-nutrient deficiencies, inter-pregnancy intervals <12 months or >60
months, lack of antenatal care, maternal infections, pre-eclampsia and
type-2 diabetes. The three major causes of neonatal deaths are
complications from preterm birth (35%), infections (33%), and
intra-partum related conditions or birth asphyxia (20%).
To conclude, improving perinatal mortality in India
is the need of the hour. Factors that were contributory to perinatal
mortality in a hospital-based study in 1964 are still widely prevalent
throughout the country even after fifty years. The silver lining is that
awareness has been created from the data generated after the national
registry was started, operational targets have been set, and strategies
have been initiated with a strong political will behind them.
References
1. Bajpai PC, Kutty D, Rajgopalan KC, Wahal KM.
Observations on perinatal mortality. Indian Pediatr. 1966;3:83-98.
2. Baird D, Walker J, Thomson AM. The causes and
prevention of stillbirths and first week deaths. A classification of
deaths by clinical cause; the effect of age, parity and length of
gestation on death rates by cause. J Obstet Gynaecol Br Emp.
1954;61:433-48.
3. Peller S. Studies on mortality since the
Renaissance, twins and singletons. Bull Hist Med. 1944;16:362-81.
4. WHO. ICD-10 International statistical
classification of diseases and related health problems-instruction
manual. Geneva, Switzerland:World Health Organization; 2004. p.2.
5. Flenady V Froen JF, Pinar H, Torabi R, Saastad E,
Guyon G, et al. An evaluation of classification systems for
stillbirth. BMC Pregnancy Childbirth. 2009;9:24.
6. Raghuveer G. Perinatal deaths: relevance of
Wiggles-worth’s classification. Paediatr Perinat Epidemiol.
1992;6:45-50.
7. Public Health Foundation of India, All India
Institute of Medical Sciences, Save the Children. Zodpey S, Paul VK,
editors. State of India’s Newborns (SOIN) 2014- A Report. New Delhi:
PHFI, AIIMS, SC;2014.
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