Outcomes and Associated Factors of Babies Diagnosed With Meconium Aspiration Syndrome (Mas) : A Case Control Study
Outcomes and Associated Factors of Babies Diagnosed With Meconium Aspiration Syndrome (Mas) : A Case Control Study
Outcomes and Associated Factors of Babies Diagnosed With Meconium Aspiration Syndrome (Mas) : A Case Control Study
10(12), 1098-1104
RESEARCH ARTICLE
OUTCOMES AND ASSOCIATED FACTORS OF BABIES DIAGNOSED WITH MECONIUM
ASPIRATION SYNDROME (MAS): A CASE CONTROL STUDY
Dr. Jibril Abdi Malin1, Dr. Suleyman Abdullahi Mohammed2 and Mr. Timothy Kimutai3
1. Department of PediatricsControl Kalkaal Hospital, Mogadishu, Somalia.
2. Senior Consultant GI-Surgery Kalkaal Hospital, Mogadishu, Somalia.
3. Statistics and Information Kalkaal Hospital, Mogadishu, Somalia.
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Manuscript Info Abstract
……………………. ………………………………………………………………
Manuscript History Introduction: Meconium aspiration syndrome (MAS) is an illness that
Received: 30 October 2022 linked with significant respiratory morbidity among neonates born
Final Accepted: 30 November 2022 through meconium-stained amniotic fluid (MSAF). MAS, the most
Published: December 2022 common cause of serious sickness and death in newborns, occurs in
around 5% to 10% of births. 6–25% of all babies have "meconium-
Key words:-
Meconium aspiration syndrome stained amniotic fluid (MSAF)," and approximately 11% will have
(MAS), meconium-stained amniotic MAS. This case-control study examines the outcomes and factors
fluid (MSAF), Neonatal Intensive associated with MAS in babies born with MSAF.
Care Unit (NICU), Neonates Methods: This single-center case-control study was performed in
Kalkaal Hospital from December 15, 2020 to December 15, 2021. The
hospital review board of the examined and approved the research
protocol. During this period 430 neonates were admitted to the
Neonatal Intensive Care Unit (NICU) in the Hospital. Among the 430,
63 neonates had Meconium aspiration syndrome and were included as
the case group in the study. 63 neonates without meconium-stained
amniotic fluid or meconium aspiration syndrome were selected
purposively for the study. In both groups a record was made on
information about fetal distress, gestational age of baby and delivery
mode. Additionally, complications like prolonged duration of labor,
obstructed labor, and presence of premature rupture of membrane
(PROM), and maternal age were recorded.
Results: 50.8% of the neonates born with meconium-stained amniotic
fluid were males, while 49.2% were females. 61 of the MAS neonates
were still alive, while two had expired while all of the control groups
were alive. The variables that showed to have significant effect on
MAS include fetal distress(p<0.000), gestational age greater than 42
weeks (p = 0.01), and obstructed labor (p = 0.023). The results of the
study indicates that 66.7% (n=42) of the patients in the case group had
fetal distress with a odds ratio of 19, gestational age above 42 weeks in
the case group were 31.7% with a odds ratio of 3.19 and 27% (n=17) of
the patients had obstructed labor with a odds ratio of 2.96.
Conclusion: The research found out that fetal distress, gestational age
greater than 42 weeks, and obstructed labor all contribute significantly
to meconium aspiration. Identification and screening of these risk
factors may assist in the care of patients with meconium aspiration,
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Corresponding Author:- Mr. Timothy Kimutai
Address:- Statistics and Information Kalkaal Hospital, Mogadishu, Somalia.
ISSN: 2320-5407 Int. J. Adv. Res. 10(12), 1098-1104
MAS is a frequently occurring problem encountered by pediatricians in the birth room and in newborn nursery[4].
The outcome of MAS is mostly contingent on the type, quantity of meconium aspiration, and the perinatal care
provided to the infant during labor. Proper perinatal treatment and coordinated team, approach to neonates with
MSAF have significantly reduced the morbidity and mortality associated with MAS[5].
Inconsistent results have been observed in labors affected by meconium staining of the amniotic fluid, with the
severity of the aspiration variable. Studies have shown that, factors like prolonged labor, infection during delivery,
an abnormal fetal heart rate, or problems with umbilical blood supply may result in fetal distress which leads to
MAS[3]. Additionally, it has been reported that the risk of meconium aspiration syndrome increases with gestational
age in patients with MSAF[6]. Apart from the presence of meconium, several variables associated with late-term
and post-term pregnancy may contribute to the genesis of MAS. Other aspects that have been linked with MAS
include the obstructed labor, presence of PROM, maternal illness, and maternal age[6].
MSAF is known to be associated with plethora of unfavorable fetal outcomes yet to our knowledge there is little to
no significant data in our knowledge on meconium staining in Somalia. Therefore, this case-control study seeks to
contribute to the literature by examining the outcomes and factors associated with MAS in neonates born with
MSAF.
Methods:-
Study design and Setting:
This single-center case-control study was performed in Kalkaal Hospital from December 15, 2020 to December 15,
2021. Kalkaal Hospital is a multispecialty hospital located in Hodan District, Banadir Region, Mogadishu City, in
Somalia.
Ethical approval:
The review board of the hospital examined and approved the research protocol and informed consent was obtained
from the parents of eligible candidates prior to inclusion.
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Data analysis:
To determine the outcomes and risk variables related with meconium aspiration in newborns, descriptive statistics
and odds ratios were computed using Microsoft Excel (Office 13) and the Statistical Package for Social Science
(SPSS) version 25. The threshold for statistical significance was set at p <0.05.
Results:-
Patient Demographic characteristics
Overall, as shown in table1, the study included a total of 126 neonates, 63 of whom were in the case group and had
MAS at delivery, and similarly the control group were 63 neonates without MAS at birth. 50.8% of the neonates
born in the case group were males, while 49.2% were females. 61 of the neonates with meconium aspiration were
still alive, while two had expired. All neonates in the control groups were discharged alive.
The gestational age of the majority of the studied patients was between 37 to 42 weeks. Majority of the term babies
(57.47%, n=50) did not have meconium aspiration accounting 37 babies. There were only 10 preterm babies’
majority (60.00%, n=6) being without MAS. On the other hand, majority of the neonates with gestation age being
post-term (75%) had meconium aspiration accounting for 22 babies.
The case group had 31.7 percent of patients with a gestational age greater than 42 weeks, with an odds ratio of 3.19,
compared to 12.7 percent in the control group. Furthermore, with p = 0.01, there was a statistically significant
difference between the case and control groups in terms of the patient's gestational age.
There was no statistically significant difference (p>0.05) between the case and control groups in terms of delivery
type, prolonged labor, presence of PROM, presence of maternal illness, and maternal age. However, there were
more patients in the case group who delivered by CS, 68.3 percent, compared to 60.3 percent in the control group.
Similarly, 36.5 percent of patients had prolonged labor, compared to 23.8 percent in the control group. The case
group had 28.6% of patients over the age of 30, while the control group had 17.5%.
The result of the data indicates that 27 percent (n=17) of the case group patients had obstructed labor with a odds
ratio of 2.96 whereas the control group were 11% (n=7). Moreover, the results indicate a statistically significant
difference between the two groups p = 0.023.
Discussion:-
The findings on outcomes and risks factors of meconium aspiration syndrome in this study were compared with the
findings of other relevant studies that have been published. The demographic data indicates no statistically
significant difference between the case group and the control group.
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In total, 38% of all the study neonates had fetal distress. The study's findings reveal a statistically significant
difference in fetal distress (p< 0.000) between the case group and the control group. 66.7 percent of patients in the
case group experienced fetal distress with an odds ratio of 19. The vast majority of patients in the control group,
90.5 percent, did not experience fetal. In another study, [7], the authors reported a proportion of 30% of all the study
neonates on fetal distress. The authors found a statistically significant result that 65.8% of the study patients in the
case group experienced fetal distress at birth, compared to only 3.9 percent in the control group with a very high
odds ratio of 48. In a study of 136 newborns, Salman and colleagues found that 67 percent of MAS neonates
suffered fetal distress[4]. The association between fetal distress and MSAF has been reported in many studies[8].
Shukla and Swapna's observed that 23.7 percent of patients with the MSAF exhibit fetal distress [9].
Changes in the Fetal Heart Rate (FHR), most commonly bradycardia, and meconium passing as a result of
underlying fetal hypoxia are characterized as fetal distress [10]. When a newborn is distressed, the oxygen level in
the blood drops, causing hyperactive bowels. The infant's anal sphincter relaxes, allowing meconium to pass. The
meconium is then absorbed by the amniotic fluid that surrounds the newborn [10]. Exposing the fetus tomeconium
stained amniotic fluid increases the chances for to meconium aspiration syndrome.
There was a statistically significant difference in terms of the patient's gestational age (p = 0.01 between the case
and control groups) and the odds ratio of 3.19. Additionally, the study shows that, gestational age above 42 weeks in
the case group were 31.7% while the control group were 12.7%. This study shows that, a higher proportion of
patients with gestational age greater than 42 are likely to have MAS. Other studies have shown similar trends that
important risk factors for MAS were found to include post-maturity in 12 percent of cases[4,6]. According to John
and colleagues, MAS is common in the presence of fetal distress and a pregnancy that has progressed to or beyond
42 weeks of gestation[11].
The results indicate a statistically significant difference between the case and control groups in terms of the
occurrence of obstructed labor (p = 0.023). The outcome of the data reveals that patients in the case group
experienced obstructed labor at a rate of 27%, compared to 11% in the control group. The odds ratio for having an
obstructed labor in the case group was 2.96. However, a study by Rashid et al (2021) showed no statistically
significant results in the occurrence of obstructed labor between MSAF patients and non MSAF patients[7]. The
findings of this study are consistent with a study by authors Addisu, Asres, Gedefaw and SimegnewAsmer.
According to their, the risk of developing MSAF was 5.9 times greater in obstructed labor than in unobstructed
labor. According to the authors' research, the risk of developing MSAF was 5.9 times greater in obstructed labor
than in unobstructed labor. The cause might be that maternal dehydration, distress, or shock may result in
intrauterine fetal hypoxia as a consequence of inadequate placental perfusion, followed by meconium passing into
the amniotic fluid[12].
The findings indicated that there was no statistically significant difference in the method of delivery with 68.3% and
60.3% patients in the case group and control group respectively. However, unlike this study Rashid R, et al findings
indicated a statistically significant difference in delivery type. Similarly, in Wisam A. et al in a study on MAS, there
was a significant different between MAS patients and non-MAS patients in terms of the type of delivery,
particularly caesarean section (CS) was reported as a significant factor for MAS[13].
The results in this study shows more patient in the case group compared to control group for a prolonged labor.
However, there was no statistically significant difference between the two groups. According to a study by authors
Addisu D, Asres A, Gedefaw G and Asmer S there was a statistically significant difference between patients with
MSAF and those without MSAF in regard to the duration of labor. The authors gives and explanation that this could
result from a prolonged stressful environment for the fetus that triggers gastrointestinal tract peristalsis and
relaxation of the anal sphincter allowing meconium pass. This could explain the reason for higher number of
patients with prolonged labor in the case group compared to the control group. Just like in the results of this study,
another study by Rashid R, et al indicates that there is not statistically significant association between MAS and non-
MAS patients in terms of existence of PROM, presence of maternal illness, or maternal age between the case and
control groups[7].
Since the research was done at a single hospital, the findings may not be reflective of other institutions or the general
population. Additionally, due to the constraints inherent in case control research, it may be impossible to establish a
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temporal link between MSAF and explanatory factors in this study. Additionally, another problem is that recall bias
may exist when assessing gestational age.
Conclusion:-
The research found out that fetal distress, gestational age greater than 42 weeks, and obstructed labor contribute
significantly to meconium aspiration during delivery. Identification and screening of these risk factors may assist in
the care of patients with meconium aspiration, therefore minimizing MAS-related morbidity, and mortality.
Competing interests
The authors declare no competing interest.
Authors’ contributions
Dr. Jibril Abdi Malinand Dr. Suleyman Abdullahi Mohammed contributed to all parts of the study; Mr. Timothy
Kimutai contributed to the design, analysis and interpretation of data and drafting and revising the manuscript.
Acknowledgements:-
We would like to express our gratitude to the Kalkaal Hospital management for their approval of the study, more
Specifically Dr. Suleyman Abdullahi Mohammed for being in the forefront to encourage contribution scientific
literature. Additionally, the authors would like to express their gratitude to all of the parents who entrusted their
infants to the neonatal unit's care and afterwards agreed for a follow up on additional questions after discharge.
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Meconium Status
15, 12%
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