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| {{AY}} | | {{Infobox_Disease | |
| | Name = Q fever | |
| | Image = Q fever.jpg| |
| | Caption =Organism Responsible for Q fever, ''Rocky Mountain Laboratories, NIAID, NIH''| |
| | }} |
| | __NOTOC__ |
| | {{About1|Coxiella burnetii}} |
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| ==Historical perspective==
| | {{Diaphragmatic hernia}} |
| Historical perspective:
| | {{CMG}}; {{AE}}{{AY}} |
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| In 1679, the first case of congenital diaphragmatic hernia was reported by Riverius.
| | {{SK}} Congenital diaphragm hernia, Diaphragm hernia, Hernia through the diaphragm. |
| In 1888, the first procedure to repair congenital diaphragmatic hernia in an adult was done and in 1889, the first procedure on an infant was done.
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| In 1905, the first successful operation was done but the success rate was only about 60% in 1925.
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| In 1940, A set of diagnostic criteria for diaphragmatic hernia were suggested.
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| In 1950, the transthoracic approach was suggested instead of the transabdominal approach.
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| ==Epidemiology== | | ==[[Q fever overview|Overview]]== |
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| ===Incidence=== | | ==[[Q fever historical perspective|Historical Perspective]]== |
| The incidence of congenital diaphragmatic hernia ranges from 50 to 150 per 100.000 live births.<ref name="pmid19524735">{{cite journal |vauthors=Fisher JC, Haley MJ, Ruiz-Elizalde A, Stolar CJ, Arkovitz MS |title=Multivariate model for predicting recurrence in congenital diaphragmatic hernia |journal=J. Pediatr. Surg. |volume=44 |issue=6 |pages=1173–9; discussion 1179–80 |year=2009 |pmid=19524735 |pmc=3072822 |doi=10.1016/j.jpedsurg.2009.02.043 |url=}}</ref>
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| ===Prevalence===
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| The prevalence of congenital diaphragmatic hernia ranges from 10 to 40 per live births.<ref name="pmid25411443">{{cite journal |vauthors=McGivern MR, Best KE, Rankin J, Wellesley D, Greenlees R, Addor MC, Arriola L, de Walle H, Barisic I, Beres J, Bianchi F, Calzolari E, Doray B, Draper ES, Garne E, Gatt M, Haeusler M, Khoshnood B, Klungsoyr K, Latos-Bielenska A, O'Mahony M, Braz P, McDonnell B, Mullaney C, Nelen V, Queisser-Luft A, Randrianaivo H, Rissmann A, Rounding C, Sipek A, Thompson R, Tucker D, Wertelecki W, Martos C |title=Epidemiology of congenital diaphragmatic hernia in Europe: a register-based study |journal=Arch. Dis. Child. Fetal Neonatal Ed. |volume=100 |issue=2 |pages=F137–44 |year=2015 |pmid=25411443 |doi=10.1136/archdischild-2014-306174 |url=}}</ref>
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| ===Sex===
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| Congenital diaphragmatic hernia has no sex predilection.<ref name="pmid25411443">{{cite journal |vauthors=McGivern MR, Best KE, Rankin J, Wellesley D, Greenlees R, Addor MC, Arriola L, de Walle H, Barisic I, Beres J, Bianchi F, Calzolari E, Doray B, Draper ES, Garne E, Gatt M, Haeusler M, Khoshnood B, Klungsoyr K, Latos-Bielenska A, O'Mahony M, Braz P, McDonnell B, Mullaney C, Nelen V, Queisser-Luft A, Randrianaivo H, Rissmann A, Rounding C, Sipek A, Thompson R, Tucker D, Wertelecki W, Martos C |title=Epidemiology of congenital diaphragmatic hernia in Europe: a register-based study |journal=Arch. Dis. Child. Fetal Neonatal Ed. |volume=100 |issue=2 |pages=F137–44 |year=2015 |pmid=25411443 |doi=10.1136/archdischild-2014-306174 |url=}}</ref>
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| ===Age===
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| 90% of the congenital diaphragmatic hernias present in the neonatal period.
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| Classification | | ==[[Q fever classification|Classification]]== |
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| Congenital diaphragmatic hernia can be classified into three types according to the site of herniation.
| | ==[[Q fever pathophysiology|Pathophysiology]]== |
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| Posterolateral (Bochdalek) diaphragmatic hernia
| | ==[[Q fever causes|Causes]]== |
| It is the most common subtype.
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| Most commonly occurs on the left side and rarely occurs bilaterally.
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| Anterior (Morgagni) diaphragmatic hernia
| | ==[[Q fever epidemiology and demographics|Epidemiology and Demographics]]== |
| In anterior diaphragmatic hernia, the intestine bulges into the thorax through the anterior midline.
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| Most of the cases of anterior diaphragmatic hernia occur on the right side.
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| Hiatal hernia
| | ==[[Q fever risk factors|Risk Factors]]== |
| The intestine finds its way to the thorax through the esophageal hiatus.
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| More common in the adults than in the neonates.
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| | ==[[Q fever screening|Screening]]== |
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| Pathophysiology
| | ==[[Q fever natural history, complications, and prognosis|Natural History, Complications, and Prognosis]]== |
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| The herniated viscera decrease the area needed by the lung to develop appropriately.
| | == Diagnosis == |
| According to the degree of herniation, the degree of pulmonary hypoplasia is determined.
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| The development of the pulmonary artery tree is halted too resulting in excessive masculinization of the arteries.
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| As most of the cases of diaphragmatic hernia is unilateral, the pulmonary hypoplasia is also usually unilateral, but it can be bilateral if the mediastinum is pushed by a massive unilateral hernia.
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| The abnormal alveolar development can lead to hypoxemia leading to pulmonary vasoconstriction which aggravates the condition.
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| | [[Q fever history and symptoms|History and Symptoms]] | [[Q fever physical examination|Physical Examination]] | [[Q fever laboratory tests|Laboratory Findings]] | [[Q fever chest x ray|Chest X Ray]]| [[Q fever CT|CT]] | [[Q fever MRI|MRI]] | [[Q fever other imaging findings|Other Imaging Findings]] | [[Q fever other diagnostic studies|Other Diagnostic Studies]] |
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| Natural history, complications and prognosis
| | == Treatment == |
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| Natural history
| | [[Q fever medical therapy|Medical Therapy]] | [[Q fever surgery|Surgery]] | [[Q fever primary prevention|Prevention]] | [[Q fever cost-effectiveness of therapy|Cost-Effectiveness of Therapy]] | [[Q fever future or investigational therapies|Future or Investigational Therapies]] |
| 90% of the cases of congenital diaphragmatic hernia presents in the neonatal period.
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| If left untreated, congenital diaphragmatic hernia can be fatal due to pulmonary hypoplasia and severe pulmonary hypertension.
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| Complications
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| GI complications
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| Pulmonary hypoplasia
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| Abnormal developmental rotation of the midgut
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| Midgut volvulus
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| Gastric volvulus
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| Cardiopulmonary complications
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| Pulmonary hypoplasia
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| Pulmonary artery hypertension
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| In severe cases, ventricular hypoplasia
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| Prognosis
| | ==Case Studies== |
| The prognosis is mainly dependent on the size of the defect and the degree of the herniation.
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| The presence or absence of liver herniation on fetal MRI is the most reliable prediction of the postnatal survival.
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| The estimation of fetal lung volume and lung area to head circumference is a useful indicator for the prognosis of the disease in the absence of liver herniation.
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| The mortality ranges from 25-60% of the cases.
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| ==Natural history, complications and prognosis==
| | [[Q fever case study one|Case #1]] |
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| ===Natural history===
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| 90% of the cases of congenital diaphragmatic hernia presents in the neonatal period.
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| If left untreated, congenital diaphragmatic hernia can be fatal due to pulmonary hypoplasia and severe pulmonary hypertension.
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| ===Complications===
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| GI complications
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| Pulmonary hypoplasia
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| Abnormal developmental rotation of the midgut
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| Midgut volvulus
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| Gastric volvulus
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| Cardiopulmonary complications
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| Pulmonary hypoplasia
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| Pulmonary artery hypertension
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| In severe cases, ventricular hypoplasia
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| ===Prognosis===
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| The prognosis is mainly dependent on the size of the defect and the degree of the herniation.
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| The presence or absence of liver herniation on fetal MRI is the most reliable prediction of the postnatal survival.
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| The estimation of fetal lung volume and lung area to head circumference is a useful indicator for the prognosis of the disease in the absence of liver herniation.
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| The mortality ranges from 25-60% of the cases.
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| ==Symptoms==
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| CDH most often presents in the neonatal period as:
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| Respiratory distress: The neonate may show cyanosis, tachycardia, lethargy, intolerance to feeding due to inadequate oxygenation.
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| Adrenal insufficiency: it is a common association with congenital diaphragmatic hernia.
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| ==Physical exam==
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| ===General appearance===
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| A neonate with CDH usually appears cyanotic and in acute distress.
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| ===Vital signs===
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| Heart rate: tachycardia
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| Respiratory rate: tachypnea
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| ===Lungs===
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| The chest may have a barrel shape.
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| Absent breath sounds at the side of the hernia
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| Peristaltic sounds in the chest
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| ===Heart===
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| The heart sounds may be displaced to the other side of the chest.
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| The heart sounds may reveal the murmurs of associated cardiac anomalies.
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| ===Abdomen===
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| The abdomen is scaphoid due to herniation of the abdominal content into the thoracic cavity.
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| ==Laboratory tests==
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| ===Arterial blood gas===
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| ABG may show hypoxemia, metabolic acidosis, and hypercapnia.
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| The embryo should be investigated for the presence of associated chromosomal abnormalities.
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| ==Radiological tests==
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| ===Antenatal ultrasound===
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| CDH can be diagnosed in the 24th week
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| In addition to the hernia, ultrasound can show polyhydramnios and absence of the gastric air bubble
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| Left sided CDH is far more common than right sided CDH, while bilateral CDH is rare.
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| The presence of liver herniation is associated with worse prognosis and survival.
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| The estimation of lung area to head circumference ratio can give an idea about the prognosis (especially if there is no liver herniation). The lower the ratio, the worse the prognosis.
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| ===Chest x-ray===
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| Bowel loops in the thoracic cavity (can be further demonstrated through placement of a feeding tube)
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| Shifting of the mediastinum to the contralateral side
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| ===Echocardiography===
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| Echocardiography must be done to exclude associated cardiac anomalies and to exclude the presence of an associated ventricular strain from the pressure.
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| ==Medical treatment==
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| ===Antenatal glucocorticoids===
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| Antenatal glucocorticoids improve the survival by increasing the secretion of surfactant and thus stimulating lung maturation and preventing severe pulmonary hypoplasia.
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| ==Surgical==
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| Preoperative stabilization of the patient is important as performing the operation in an unstable infant is associated with higher morbidity and mortality rates.
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| Preoperative stabilization measures include:
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| Mechanical ventilation: The aim is to ensure proper oxygenation without causing any barotrauma to the lung. Peak inspiratory pressure should be always less than 30 cm H2O
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| Nasogastric tube insertion: The aim is to decompress the bowel and to give more space for the lung
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| Blood pressure support: using vasopressors or isotonic fluid: The aim is to keep the mean blood pressure above 50 mmHg.
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| High-frequency oscillatory ventilation: It is useful in improving the oxygenation without increasing the pressure in the airways or the alveoli.
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| Extracorporeal membrane oxygenation: It is used as the last resort in patients resistant to all the conventional methods of ventilation.
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| Inhaled nitric oxide: The hypoxemia resulting from lung compression can cause hypoxemia that may result in pulmonary vasoconstriction and hypertension.
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| Surgical procedures
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| The procedure must not be done unless the infant is stable.
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| Most of the operations are done through a subcostal incision.
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| The repair can be done in one of two ways depending on its size:
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| Primary closure: it involves repairing the defect using non-absorbable sutures. It is used if the defect is relatively small.
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| Patch closure: using a prosthetic or fascial patch to close the defect. It is useful especially with large defects but increases the risk of infection.
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| Endoscopic procedures through the thorax or the abdomen have been reported to have lower mortality rates but have higher recurrence rates.
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| If CDH repair is associated with an abdominal wall defect, silo closure may be tried temporarily until the CDH is stabilized.
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| ==References==
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