Introduction
Background
Colic is commonly described as a behavioral syndrome characterized by excessive, paroxysmal crying. Colic is most likely to occur in the evenings, and it occurs without any identifiable cause. During episodes of colic, an otherwise healthy neonate or infant aged 2 weeks to 4 months is difficult to console. They stiffen, draw up their legs, and pass flatus. Colic is one of the common reasons parents seek the advice of a pediatrician or family practitioner during their child's first 3 months of life.
The most widely used definition of colic was used by Wessel et al.1 Their definition is based on the amount of crying (ie, paroxysms of crying lasting >3 h, occurring >3 d in any week for 3 wk).
Colic is a poorly understood phenomenon. It is equally likely to occur in both breastfed and formula-fed infants. Although potential adverse sequelae have been described, the disorder is generally believed to be self-limited and benign. Different feeding practices and crying may result in large amounts of air entering the gastric lumen, which suggests that excessive aerophagia may be associated with colic. Colonic fermentation is the second proposed source of excessive intestinal gas in infants. However, no experimental evidence supports either theory.
Increased levels of certain biochemical markers, such as motilin, alpha lactalbumin, and urinary 5-hydroxy-3-indole acetic acid (5-OH HIAA) have been associated in infants with colic. Data from one study suggested that psychosocial stress during pregnancy is associated with babies who develop colic.2 Further research is needed to establish a causal relationship of these factors to colic.
Although anticholinergic drugs have proven effective, they are not recommended because of their serious adverse effects. Parental anxiety can be minimized if the physician discusses colic, offers insight on future expectations, and answers the parents' questions. Reassure the parents about the generally benign and self-limiting nature of the illness. A caring and compassionate healthcare provider remains the cornerstone in the management of colic, a problem for which effective therapy remains elusive.3
Pathophysiology
The term colic derives from the Greek word kolikos or kolon, suggesting that some disturbance is occurring in the GI tract. Researchers have also postulated nervous system, behavioral, and psychologic etiologies.
Frequency
International
Colic affects 10-30% of infants worldwide.
Mortality/Morbidity
Increased susceptibility to recurrent abdominal pain, allergic disorders and certain psychological disorders may be seen in some babies with colic in their childhood.
Sex
This condition is encountered in male and female neonates and infants with equal frequency.
Age
The colic syndrome is commonly observed in neonates and infants aged 2 weeks to 4 months.
Clinical
History
- Colic remains a diagnosis of exclusion.
- Crying by infants with or without colic is mostly observed in evening hours and peaks at the age of 6 weeks. The cause of this diurnal rhythm is not known. The amount of crying is not related to an infant's sex; the mother's parity; or the parents' socioeconomic status, education, or ages.
- On acoustic analysis, colicky crying differs from regular crying. Compared with regular crying, colicky crying is more variable in pitch, more turbulent or dysphonic, and has a higher pitch. Mothers of infants with colic, unlike mothers of infants without colic, rate the cries as more urgent, discomforting, arousing, aversive, and irritating than usual.
- Obtain a detailed history about the timing, the amount of crying, and the family's daily routine. The benign nature of colic should be emphasized.
- Rule out causes of excessive crying in an infant, such as having hair in the eye, strangulated hernia, otitis, and sepsis.
Physical
- Perform physical examination to confirm normalcy.
- Infants with colic often have accelerated growth.
- Weight gain is typical, whereas failure to thrive should make one suspicious about the diagnosis of colic.
Causes
- GI causes may include but are not limited to gastroesophageal reflux, overfeeding, underfeeding, milk protein allergy, and early introduction of solids. Parental anxiety and parental stress has been a subject of many studies. Postpartum depression may lead to stress in parents, which may be transferred to the infant, resulting in excess crying.
- Other causes include inexperienced parents or incomplete or no burping after feeding. Incorrect positioning after feeding may contribute to excessive crying. Note that colic is not limited to the first-born child, casting doubt on the theory about inexperienced parenting as the etiologic factor. Recent epidemiologic evidence suggests that exposure to cigarette smoke and its metabolites may be related to colic. Maternal smoking during pregnancy may be associated with colic.4
- Some evidence has linked persistent crying in young infants to food allegy.5 An association between colic and cow's milk allergy (CMA) has been postulated.6 Data from one study suggested an association between low birth weight and increased incidence of colic.7
- Recently, some reports have focused on intestinal microflora and its association with colic.8 Lower counts of intestinal lactobacilli were observed in infants with colic compared with infants without colic.9
More on Colic |
Overview: Colic |
| Differential Diagnoses & Workup: Colic |
| Treatment & Medication: Colic |
| Follow-up: Colic |
| References |
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References
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Sondergaard C, Olsen J, Friis-Hasche. Psychological distress during pregnancy and the risk of infantile colic:a follo-up study. Acta Paediatrica. 2003;92(7):811-816. [Medline].
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[Best Evidence] Savino F, Pelle E, Palumeri E, Oggero R, Miniero R. Lactobacillus reuteri (American Type Culture Collection Strain 55730) versus simethicone in the treatment of infantile colic: a prospective randomized study. Pediatrics. Jan 2007;119(1):e124-30. [Medline].
Savino F, Cresi F, Pautasso S, et al. Intestinal microflora in breastfed colicky and non-colicky infants. Acta Paediatr. Jun 2004;93(6):825-9. [Medline].
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[Best Evidence] Hill DJ, Roy N, Heine RG, et al. Effect of a low-allergen maternal diet on colic among breastfed infants: a randomized, controlled trial. Pediatrics. Nov 2005;116(5):e709-15. [Medline].
Kurtoglu S, Uzum K, Hallac IK. 5-Hydoxy-3-indole acetic acid levels in infantile colic:Is serotoninergic tonus responsible for this problem?. Acta paediatrica. 1997;86:764-765. [Medline].
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Rao MR, Brenner RA, Schisterman EF, Vik T, Mills JL. Long term cognitive development in children with prolonged crying. Arch Dis Child. Nov 2004;89(11):989-92. [Medline].
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Further Reading
Keywords
colic syndrome, evening colic, infantile colic, 3-month colic, incessant crying, nonstop crying, periodic crying, episodic crying, sepsis, otitis, strangulated hernia, maternal smoking, cow's milk allergy, CMA, treatment, diagnosis
Overview: Colic