Acute chest syndrome: Difference between revisions
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==Background== | ==Background== | ||
* | [[File:Lung and diaphragm.jpg|thumb|Lobes of the lung with related anatomy.]] | ||
[[File:Computed tomograph of pulmonary vessels.jpg|thumb|Pulmonary arterial tree anatomy.]] | |||
*The leading cause of death in patients with HbSS in the United States | |||
**HbSS individuals are at higher risk than HbSC, but acute chest may occur in both genotypes | |||
*Occurs most commonly in the 2-4yr old age group and then declines with age | *Occurs most commonly in the 2-4yr old age group and then declines with age | ||
* | *Pathophysiology is due to deoxygenation of Hb, leading to sickling in the pulmonary vasculature, causing vaso-occlusionm, ischemia, and endothelial injury<ref>Friend A, Settelmeyer TP, Girzadas D. Acute Chest Syndrome. [Updated 2023 Feb 6]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK441872/</ref> | ||
**In pediatric population, ACS is more often triggered by asthma or viral/bacterial pulmonary infection, leading to local hypoxia | |||
**In adult population, ACS is commonly associated with vaso-occlusive pain, which may lead to hypoventilation or long bone fat/marrow emboli | |||
**However, a specific cause is not identified in a majority of cases | |||
===Causes=== | ===Causes=== | ||
*Pulmonary infection | *Pulmonary infection | ||
**[[ | **[[Chlamydophila pneumoniae]] and [[Mycoplasma pneumoniae]] are most common organisms | ||
**May also be caused by | **May also be caused by [[S. aureus]], [[H. influenzae]], [[Klebsiella]], and viruses | ||
*[[Fat emboli]] | ***Infection due to [[S. pneumoniae]] is now rare due to pneumococcal immunization and prophylactic penicillin therapy | ||
** | *[[Fat embolism|Fat emboli]] | ||
**Suspect if symptoms start 2-3 days following acute pain crisis | |||
**Can cause microvasculature occlusion in the pulmonary circulation, leading to bone marrow infarction | |||
**Autopsies have shown bony slivers and marrow fat found in pulmonary vasculature of patients | |||
*Rib infarction | *Rib infarction | ||
*Overly aggressive IV hydration | *Overly aggressive [[IVF|IV hydration]] | ||
*[[Vaso-occlusive pain crisis]] | *[[Vaso-occlusive pain crisis]] | ||
*[[Asthma]] | *[[Asthma]] | ||
*Iatrogenic | |||
**Opioid analgesics can lead to hypoventilation | |||
==Clinical Features== | ==Clinical Features== | ||
*[[Fever]] >38. | *New infiltrate on chest x-ray PLUS one of the following signs or symptoms | ||
*[[Cough]] | **[[Fever]] >38.5°C (101.3°F) | ||
*[[Wheezing]] | **[[Cough]] | ||
*[[Tachypnea]] | **[[Wheezing]] | ||
*[[Chest pain]] | **[[Tachypnea]] | ||
**[[Chest pain]] | |||
**[[Hypoxemia]] | |||
==Complications== | |||
*[[Pulmonary Embolism]] (bone marrow, fat or thrombotic) | |||
*[[Pneumonia]] | |||
*[[CVA]] | |||
*[[Sepsis]] | |||
==Differential Diagnosis== | ==Differential Diagnosis== | ||
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==Evaluation== | ==Evaluation== | ||
[[File:Transfusion-related acute lung injury chest X-ray.gif|thumb|Chest X-ray of TRALI (left) compared to the same subject after resolution of symptoms (right).]] | |||
===Work-Up=== | ===Work-Up=== | ||
*CBC | *CBC | ||
*Retic count | *Retic count | ||
*VBG / ABG | *[[VBG]] / [[ABG]] | ||
*Blood culture /sputum cultures | *[[Blood culture]] /sputum cultures | ||
*[[CXR]] | *[[CXR]] | ||
*Type and screen/crossmatch | |||
=== | ===Imaging=== | ||
*New infiltrate on | *New infiltrate seen on chest x-ray | ||
** | **Chest x-ray findings may lag behind clinical features | ||
** | *[[Lung ultrasound]] to CXR or CT finding correlations<ref>Razazi et al. Bedside Lung Ultrasound During Acute Chest Syndrome in Sickle Cell Disease. Medicine (Baltimore). 2016 Feb; 95(7): e2553.</ref> | ||
** | **Consolidation seen as hyperechoic punctiform air bronchograms | ||
**Ground-glass opacities seen as coalescent B lines | |||
**[[ | **[[Pleural effusion]], defined as large if interpleural distance > 25 mm | ||
* | *Consider CTPE for persistent hypoxia with unclear cause | ||
==Management== | ==Management== | ||
*[[O2]] | |||
**Titrate to pulse oximetry >95% | |||
**NNoninvasive or invasive positive pressure ventilation may be required in severe cases | |||
*Hydration | |||
**[[oral rehydration therapy|Oral hydration]] preferred | |||
**[[IV hydration]] with hypotonic fluid if patient unable to tolerate PO | |||
***Consider D5 + 1/2 Normal saline at 1-1.5x maintenance rate | |||
**While dehydration can predispose sickling, overhydration can cause pulmonary edema that exacerbates sickling | |||
*[[Analgesia]] | |||
**Opioids often required for adults and sometimes needed for pediatrics | |||
**However, attempt to prevent oversedation and hypoventilation, atelectasis | |||
*Incentive Spirometry | |||
*[[Bronchodilators]] | |||
*[[Antibiotics]] | |||
**3rd generation [[cephalosporin]] + [[macrolide]] | |||
*Simple [[Transfusion]] (leucocyte depleted) | |||
**Consider [[pRBCs|transfusion]] to goal of hemoglobin 11 / hematocrit 30 for: | |||
***O2 Sat <92% on room air | |||
***hematocrit/hemoglobin 10-20% below patient's usual values, or continuously dropping hematocrit/hemoglobin | |||
*[[Exchange transfusion]] | |||
**Consider for: | |||
***Progression of acute chest syndrome despite simple transfusion | |||
***Severe hypoxemia | |||
***Multi-lobar disease | |||
***Previous history of severe acute chest syndrome or cardiopulmonary disease | |||
**Can prevent the need for intubation | |||
== | ==Disposition== | ||
* | *Admission | ||
* | *Consider consultation to hematologist | ||
==See Also== | ==See Also== | ||
*[[Sickle Cell Crisis]] | *[[Sickle Cell Crisis]] | ||
== | ==External Links== | ||
*[https://emcrit.org/ibcc/sickle-chest/ IBCC Chapter on Acute Chest Syndrome] | |||
==References== | ==References== | ||
<references/> | |||
[[Category:Heme/Onc]] | [[Category:Heme/Onc]] | ||
[[Category:Pulmonary]] |
Latest revision as of 18:51, 24 April 2024
Background
- The leading cause of death in patients with HbSS in the United States
- HbSS individuals are at higher risk than HbSC, but acute chest may occur in both genotypes
- Occurs most commonly in the 2-4yr old age group and then declines with age
- Pathophysiology is due to deoxygenation of Hb, leading to sickling in the pulmonary vasculature, causing vaso-occlusionm, ischemia, and endothelial injury[1]
- In pediatric population, ACS is more often triggered by asthma or viral/bacterial pulmonary infection, leading to local hypoxia
- In adult population, ACS is commonly associated with vaso-occlusive pain, which may lead to hypoventilation or long bone fat/marrow emboli
- However, a specific cause is not identified in a majority of cases
Causes
- Pulmonary infection
- Chlamydophila pneumoniae and Mycoplasma pneumoniae are most common organisms
- May also be caused by S. aureus, H. influenzae, Klebsiella, and viruses
- Infection due to S. pneumoniae is now rare due to pneumococcal immunization and prophylactic penicillin therapy
- Fat emboli
- Suspect if symptoms start 2-3 days following acute pain crisis
- Can cause microvasculature occlusion in the pulmonary circulation, leading to bone marrow infarction
- Autopsies have shown bony slivers and marrow fat found in pulmonary vasculature of patients
- Rib infarction
- Overly aggressive IV hydration
- Vaso-occlusive pain crisis
- Asthma
- Iatrogenic
- Opioid analgesics can lead to hypoventilation
Clinical Features
- New infiltrate on chest x-ray PLUS one of the following signs or symptoms
Complications
- Pulmonary Embolism (bone marrow, fat or thrombotic)
- Pneumonia
- CVA
- Sepsis
Differential Diagnosis
Sickle cell crisis
- Vaso-occlusive pain crisis
- Bony infarction
- Dactylitis
- Avascular necrosis of femoral head
- Acute chest syndrome
- Asthma
- Pulmonary hypertension
- Gallbladder disease
- Acute hepatic sequestration
- Infection
- Parvovirus B19
- Splenic sequestration
- CVA
- Cerebral aneurysm and ICH
- Priapism
- Papillary necrosis
Evaluation
Work-Up
- CBC
- Retic count
- VBG / ABG
- Blood culture /sputum cultures
- CXR
- Type and screen/crossmatch
Imaging
- New infiltrate seen on chest x-ray
- Chest x-ray findings may lag behind clinical features
- Lung ultrasound to CXR or CT finding correlations[2]
- Consolidation seen as hyperechoic punctiform air bronchograms
- Ground-glass opacities seen as coalescent B lines
- Pleural effusion, defined as large if interpleural distance > 25 mm
- Consider CTPE for persistent hypoxia with unclear cause
Management
- O2
- Titrate to pulse oximetry >95%
- NNoninvasive or invasive positive pressure ventilation may be required in severe cases
- Hydration
- Oral hydration preferred
- IV hydration with hypotonic fluid if patient unable to tolerate PO
- Consider D5 + 1/2 Normal saline at 1-1.5x maintenance rate
- While dehydration can predispose sickling, overhydration can cause pulmonary edema that exacerbates sickling
- Analgesia
- Opioids often required for adults and sometimes needed for pediatrics
- However, attempt to prevent oversedation and hypoventilation, atelectasis
- Incentive Spirometry
- Bronchodilators
- Antibiotics
- 3rd generation cephalosporin + macrolide
- Simple Transfusion (leucocyte depleted)
- Consider transfusion to goal of hemoglobin 11 / hematocrit 30 for:
- O2 Sat <92% on room air
- hematocrit/hemoglobin 10-20% below patient's usual values, or continuously dropping hematocrit/hemoglobin
- Consider transfusion to goal of hemoglobin 11 / hematocrit 30 for:
- Exchange transfusion
- Consider for:
- Progression of acute chest syndrome despite simple transfusion
- Severe hypoxemia
- Multi-lobar disease
- Previous history of severe acute chest syndrome or cardiopulmonary disease
- Can prevent the need for intubation
- Consider for:
Disposition
- Admission
- Consider consultation to hematologist
See Also
External Links
References
- ↑ Friend A, Settelmeyer TP, Girzadas D. Acute Chest Syndrome. [Updated 2023 Feb 6]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK441872/
- ↑ Razazi et al. Bedside Lung Ultrasound During Acute Chest Syndrome in Sickle Cell Disease. Medicine (Baltimore). 2016 Feb; 95(7): e2553.