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SIDS

From Wikipedia, the free encyclopedia

Sudden infant death syndrome
Other names
  • Cot death
  • crib death
Safe to Sleep logo
TheSafe to Sleepcampaign encourages having infants sleep on their back to reduce the risk of SIDS.
Specialty
Usual onsetOne to four months in age[1]
CausesUnknown
Risk factors
Diagnostic method
Differential diagnosis
Prevention
Frequency1 in 1,000–10,000

Sudden infant death syndrome(SIDS), sometimes known ascot death,is the sudden unexplaineddeathof a child of less than one year of age. Diagnosis requires that the death remain unexplained even after a thoroughautopsyand detailed death scene investigation.[2]SIDS usually occurs duringsleep.[3]Typically death occurs between the hours of midnight and 9:00 a.m.[4]There is usually no noise or evidence of struggle.[5]SIDS remains the leading cause of infant mortality in Western countries, constituting half of all post-neonatal deaths.[6]

The exact cause of SIDS is unknown.[7]The requirement of a combination of factors including a specific underlying susceptibility, a specific time in development, and an environmental stressor has been proposed.[3][7]These environmental stressors may include sleeping on the stomach or side, overheating, and exposure totobacco smoke.[7]Accidental suffocationfrombed sharing(also known as co-sleeping) or soft objects may also play a role.[3][8]Another risk factor is being born before 39weeks of gestation.[1]SIDS makes up about 80% of sudden and unexpected infant deaths (SUIDs).[3]The other 20% of cases are often caused byinfections,genetic disorders,and heart problems.[3]Whilechild abusein the form of intentionalsuffocationmay be misdiagnosed as SIDS, this is believed to make up less than 5% of sudden death cases.[3]

The most effective method of reducing the risk of SIDS is putting a child less than one year old on their back to sleep.[1]Other measures include a firm mattress separate from but close to caregivers, no loose bedding, a relatively cool sleeping environment, using apacifier,and avoiding exposure to tobacco smoke.[9]Breastfeedingandimmunizationmay also be preventative.[9][10]Measures not shown to be useful include positioning devices andbaby monitors.[9][10]Evidence is not sufficient for the use of fans.[9]Grief supportfor families affected by SIDS is important, as the death of the infant is unexpected, unexplained, and can cause suspicion that the infant may have been intentionally harmed.[3]

Rates of SIDS vary nearly tenfold indeveloped countriesfrom one in a thousand to one in ten thousand.[3][11]Globally, it resulted in about 19,200 deaths in 2015, down from 22,000 deaths in 1990.[12]SIDS was the third leading cause ofdeath in children less than one year oldin the United States in 2011.[13]It is the most common cause of death between one month and one year of age.[1]About 90% of cases happen before six months of age, with it being most frequent between two months and four months of age.[3][1]It is more common in boys than girls.[1]Rates of SIDS have decreased in areas with"safe sleep" campaignsby up to 80%.[11]

Recent estimates suggest that less than 10% of SIDS arehomicides.[14]

Definition

[edit]
Video explanation

The syndrome applies only to infants under one.[15]SIDS is adiagnosis of exclusionand should be applied to only those cases in which an infant's death is sudden and unexpected, and remains unexplained after the performance of an adequatepostmorteminvestigation, including:

  1. anautopsy(by an experienced pediatricpathologist,if possible);
  2. investigation of the death scene and circumstances of the death; and
  3. exploration of themedical historyof the infant and family.

After investigation, some of these infant deaths are found to be caused by suffocation,hyperthermiaorhypothermia,neglect or some other defined cause.[16]

Australia and New Zealand shifted tosudden unexpected death in infancy(SUDI) for professional, scientific, and coronial clarity.

The term SUDI is now often used instead of sudden infant death syndrome (SIDS) because some coroners prefer to use the term 'undetermined' for a death previously considered to be SIDS. This change is causing diagnostic shift in the mortality data.[17]

In addition, the USCenters for Disease Control and Preventionhave proposed that such deaths be calledsudden unexpected infant deaths(SUID) and that SIDS is a subset of SUID.[18]

Age

[edit]

SIDS has a four-parameterlognormalage distributionthat spares infants shortly after birth — the time of maximal risk for almost all other causes of non-trauma infant death.

By definition, SIDS deaths occur under the age of one year, with the peak incidence occurring when the infant is two to four months old. This is considered a critical period because the infant's ability to rouse from sleep is not yet mature.[3]

Risk factors

[edit]

The exact cause of SIDS is unknown.[7]Although studies have identified risk factors for SIDS, such as putting infants to bed on their bellies, there has been little understanding of the syndrome's biological process or its potential causes. Deaths from SIDS are unlikely to be due to a single cause, but rather to multiple risk factors.[19]The frequency of SIDS does appear to be influenced by social, economic, or cultural factors, such as maternal education, race or ethnicity, or poverty.[20]SIDS is believed to occur when an infant with an underlying biological vulnerability, who is at a critical development age, is exposed to an external trigger.[3]The following risk factors generally contribute either to the underlying biological vulnerability or represent an external trigger:

Tobacco smoke

[edit]

SIDS rates are higher in babies of mothers whosmoke during pregnancy.[21][22]Between no smoking and smoking one cigarette a day, on average, the risk doubles. About 22% of SIDS in the United States is related to maternal smoking.[23]SIDS correlates with levels ofnicotineand its derivatives in the baby.[24]Nicotine and derivatives cause alterations inneurodevelopment.[25]

Sleeping

[edit]

Placing an infant to sleep while lying on the belly or side rather than on the back increases the risk for SIDS.[9][26]This increased risk is greatest at two to three months of age.[9]Elevated or reduced room temperature also increases the risk,[27]as does excessive bedding, clothing, soft sleep surfaces, andstuffed animalsin the bed.[28]Bumper padsmay increase the risk of SIDS due to the risk of suffocation. They are not recommended for children under one year of age, as this risk of suffocation greatly outweighs the risk of head bumping or limbs getting stuck in the bars of the crib.[9]

Sharing a bedwith parents or siblings increases the risk for SIDS.[29]This risk is greatest in the first three months of life, when the mattress is soft, when one or more persons share the infant's bed, especially when the bed partners are using drugs or alcohol or are smoking.[9]The risk remains, however, even in parents who do not smoke or use drugs.[30]TheAmerican Academy of Pediatricsthus recommends "room-sharing without bed-sharing", stating that such an arrangement can decrease the risk of SIDS by up to 50%. Furthermore, the academy has recommended against devices marketed to make bed-sharing "safe", such as "in-bed co-sleepers".[31]

Room sharing as opposed to solitary sleeping is known to decrease the risk of SIDS.[32]

Breastfeeding

[edit]

Breastfeedingis associated with a lower risk of SIDS.[33]It is not clear if co-sleeping among mothers who breastfeed without any other risk factors increases SIDS risk.[34]

Pregnancy and infant factors

[edit]

SIDS rates decrease with increasing maternal age, withteenage mothersat greatest risk.[21]Delayed or inadequateprenatal carealso increases risk.[21]Lowbirth weightis a significant risk factor. In the United States from 1995 to 1998, the SIDS death rate for infants weighing 1000–1499 g was 2.89/1000, while for a birth weight of 3500–3999 g, it was only 0.51/1000.[35][36]Premature birthincreases the risk of SIDS death roughly fourfold.[21][35]From 1995 to 1998, the U.S. SIDS rate for births at 37–39 weeks ofgestationwas 0.73/1000, while the SIDS rate for births at 28–31 weeks of gestation was 2.39/1000.[35]

Anemiahas also been linked to SIDS[37](however, per item 6 in the list of epidemiologic characteristics below, extent of anemia cannot be evaluated at autopsy because an infant's totalhemoglobincan only be measured during life).[38]SIDS incidence rises from zero at birth, is highest from two to four months of age, and declines toward zero after the infant's first year.[39]

Genetics

[edit]

Geneticsplays a role, as SIDS is more prevalent in males.[40][41]There is a consistent 50% male excess in SIDS per 1000 live births of each sex. Given a 5% male excess birth rate, there appears to be 3.15 male SIDS cases per 2 female cases, for a male fraction of 0.61.[40][41]This value of 61% in the US is an average of 57% black male SIDS, 62.2% white male SIDS and 59.4% for all other races combined. Note that when multiracial parentage is involved, infant race is arbitrarily assigned to one category or the other; most often it is chosen by the mother. TheX-linkagehypothesis for SIDS and the male excess in infant mortality have shown that the 50% male excess might be related to a dominant X-linkedallele,occurring with a frequency of13that is protective againsttransient cerebral anoxia.An unprotected male would occur with a frequency of23and an unprotected female would occur with a frequency of49.

About 10 to 20% of SIDS cases are believed to be due tochannelopathies,which are inherited defects in theion channelswhich play an important role in the contraction of the heart.[42]

Genetic evidence published in November 2020 concerning the case ofKathleen Folbigg,who was imprisoned for the death of her children, showed that at least two of the children had genetic mutations in theCALM2gene that predisposed them to heart complications.[43]Kathleen was pardoned 5 June 2023 after spending 20 years in jail.[44]

Alcohol

[edit]

Drinking of alcohol by parents is linked to SIDS.[45]One study found a positive correlation between the two during New Years celebrations and weekends.[46]Another found thatalcohol use disorderwas linked to a more than doubling of risk.[47]

Other

[edit]

A 2022 study found that infants who died of SIDS exhibited significantly lower specific activity ofbutyrylcholinesterase,an enzyme involved in the brain's arousal pathway, shortly after birth. This can serve as abiomarkerto identify infants with a potentialautonomiccholinergicdysfunction and elevated risk for SIDS.[48][49][50]

SIDS has been linked to cold weather, with this association believed to be due to over-bundling and thus, overheating.[51]Premature babies are at four times the risk of SIDS, possibly related to an underdeveloped ability to automatically control the cardiovascular system.[52]

A 2-part edition ofThe Cook Reportfrom 1994 found that antimony- and phosphorus-containing compounds used as fire retardants inPVCand other cot mattress materials are not a cause of SIDS.[53]The report also states that toxic gas cannot be generated from antimony in mattresses and that babies had SIDS on mattresses that did not contain the compound.

It has been suggested that some cases of SIDS may be related toStaphylococcus aureusandEscherichia coliinfections.[54]

Diagnosis

[edit]

Differential diagnosis

[edit]

Some conditions that are often undiagnosed and could be confused with orcomorbidwith SIDS include:

For example, an infant with MCAD deficiency might die by "classical SIDS" if foundswaddledandprone,with its head covered, in an overheated room whereparents were smoking.Genes indicating susceptibility to MCAD and Long QT syndrome do not protect an infant from dying of classical SIDS. Therefore, the presence of a susceptibility gene, such as for MCAD, means the infant might have died either from SIDS or from MCAD deficiency. It is currently impossible for a pathologist to distinguish between them.

A 2010 study looked at 554 autopsies of infants inNorth Carolinathat listed SIDS as the cause of death, and suggested that many of these deaths may have been due to accidental suffocation. The study found that 69% of autopsies listed other possible risk factors that could have led to death, such as unsafe bedding or sleeping with adults.[62]

Several instances ofinfanticidehave been uncovered in which the diagnosis was originally SIDS.[63][64]The estimate of the percentage of SIDS deaths that are actually infanticide varies from less than 1% to up to 5% of cases.[65]

Some have underestimated the risk of two SIDS deaths occurring in the same family; theRoyal Statistical Societyissued a media release refuting expert testimony in one UK case, in which the conviction was subsequently overturned.[66]

Prevention

[edit]

A number of measures have been found to be effective in preventing SIDS, including changing the sleeping position tosupine,breastfeeding, limiting soft bedding, immunizing the infant and using pacifiers.[9][67]The use of electronic monitors has not been found to be useful as a preventative strategy.[9]The effect that fans might have on the risk of SIDS has not been studied well enough to make any recommendation about them.[9]Evidence regarding swaddling is unclear regarding SIDS.[9]A 2016 review found tentative evidence that swaddling increases the risk of SIDS, especially among babies placed on their bellies or sides while sleeping.[68]

Measures not shown to be useful include positioning devices andbaby monitors.[9][10]In the United States, companies that sell the monitors do not haveFDAapproval for them as medical devices.[69]

Sleep positioning

[edit]
SIDS rate from 1988 to 2006 (U.S.)

Sleeping on the back has been found to reduce the risk of SIDS.[70]It is thus recommended by theAmerican Academy of Pediatricsand promoted as a best practice by the USNational Institute of Child Health and Human Development(NICHD) "Safe to Sleep"campaign. The incidence of SIDS has fallen in a number of countries in which this recommendation has been widely adopted.[71]Sleeping on the back does not appear to increase the risk of choking, even in those withgastroesophageal reflux disease.[9]While infants in this position may sleep more lightly, this is not harmful.[9]Sharing the same room as the parents but in a different bed may decrease the SIDS risk by half.[9]

Pacifiers

[edit]

The use ofpacifiersappears to decrease the risk of SIDS,[quantify]although the reason is unclear.[9]TheAmerican Academy of Pediatricsconsiders pacifier use to prevent SIDS to be reasonable.[9]Pacifiers do not appear to affect breastfeeding in the first four months, even though this is a common misconception.[72]

Bedding

[edit]

Product safety experts advise against using pillows, overly soft mattresses, sleep positioners, bumper pads (crib bumpers), stuffed animals, or fluffy bedding in the crib, and recommend instead dressing the child warmly and keeping the crib "naked."[73]

Due to the obvious dangers, experts have also warned that blankets or other clothing not be placed over a baby's head.[74]

The use of a "baby sleep bag"or" sleep sack ", a soft bag with holes for the baby's arms and head can be used as a type of bedding that warms the baby without covering its head.[75]

Vaccination

[edit]

Infants typically receive several vaccinations between the ages of 2 and 4 months, which is also the peak age for SIDS. Due to this coincidence, a number of studies have investigated the possible role of vaccinations as a cause of SIDS. These have found either no relation between vaccinations and SIDS, or a reduction of the risk of SIDS following vaccination.[76][77][78][79][80][81]A 2007 meta-analysis found that vaccinations were associated with a halving of the risk of SIDS, and argued that immunisation should be a part of SIDS prevention campaigns.[79][82]

Epidemiology

[edit]
Arcutio, a device designed to prevent infant death by suffocation,Philosophical Transactions422 (1732)

Globally, SIDS resulted in about 22,000 deaths as of 2010,down from 30,000 deaths in 1990.[83]Rates vary significantly by population from 0.05 per 1000 in Hong Kong to 6.7 per 1000 in Native Americans.[84]

SIDS was responsible for 0.54 deaths per 1,000 live births in the US in 2005.[35]It is responsible for far fewer deaths thancongenital disordersanddisorders related to short gestation,though it is the leading cause of death in healthy infants after one month of age.

SIDS deaths in the US decreased from 4,895 in 1992 to 2,247 in 2004, a 54% decrease.[85]During a similar time period, 1989 to 2004, SIDS as the cause of death for sudden infant death (SID) decreased from 80% to 55%, a 31% decrease.[85]According to John Kattwinkel, chairman of the Centers for Disease Control and Prevention (CDC) Special Task Force on SIDS "A lot of us are concerned that the rate (of SIDS) isn't decreasing significantly, but that a lot of it is justcodeshifting ".[85]

Race

[edit]
Rates of SIDS by race/ethnicity in the U.S., 2009, CDC, 2013

In 2013, there were persistent disparities in SIDS deaths among racial and ethnic groups in the U.S. In 2009, the rates of death range from 20.3 per 100,000 live births for Asian/Pacific Islander to 119.2 per 100,000 live births for Native Americans/Alaska Native. African American infants have a 24% greater risk (100.7 per 100,000 live births) of having a SIDS-related death, compared to the U.S. population as a whole,[86]and experience a 2.5 greater incidence of SIDS than in Caucasian infants.[87]Rates are calculated per 100,000 live births to enable more accurate comparison across groups of different total population size.

Research suggests that factors which contribute more directly to SIDS risk—maternal age, exposure to smoking, safe sleep practices, etc.—vary by racial and ethnic group and therefore risk exposure also varies by these groups.[3]Risk factors associated with prone sleeping patterns of African American families include mother's age, household poverty index, rural/urban status of residence, and infant's age. More than 50% of African American infants were placed in non-recommended sleeping positions, according to a 2012 study completed in South Carolina,[88]indicating that cultural factors can be protective as well as problematic.[89]

The rate of SIDS per 1000 births varies among ethnic groups in the United States:[27][90]

  • Central Americans and South Americans: 0.20
  • Asian/Pacific Islanders: 0.28
  • Mexicans: 0.24
  • Puerto Ricans: 0.53
  • Whites: 0.51
  • African Americans: 1.08
  • Native American: 1.24

Society and culture

[edit]

Many popular media portrayals of infants show them in non-recommended sleeping positions.[9]

See also

[edit]

References

[edit]
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