Acute chest syndrome: Difference between revisions
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==Background== | ==Background== | ||
* | *The leading cause of death in patients with HbSS in the United States | ||
*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 | ||
*Due to pulmonary ischemia and infarction; complication of [[pneumonia]] | *Due to pulmonary ischemia and infarction; complication of [[pneumonia]] | ||
| Line 6: | Line 6: | ||
===Causes=== | ===Causes=== | ||
*Pulmonary infection | *Pulmonary infection | ||
**[[ | **[[Chlamydia 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 | ||
***Infection due to [[S. pneumoniae]] is now rare due to pneumococcal immunization and prophylactic penicillin therapy | |||
*[[Fat embolism|Fat emboli]] | *[[Fat embolism|Fat emboli]] | ||
**Lodge in pulmonary vasculature → additional ischemia | **Lodge in pulmonary vasculature → additional ischemia | ||
Revision as of 19:14, 14 August 2023
Background
- The leading cause of death in patients with HbSS in the United States
- Occurs most commonly in the 2-4yr old age group and then declines with age
- Due to pulmonary ischemia and infarction; complication of pneumonia
Causes
- Pulmonary infection
- Chlamydia 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
- Lodge in pulmonary vasculature → additional ischemia
- Rib infarction
- Overly aggressive IV hydration
- Vaso-occlusive pain crisis
- Asthma
Clinical Features
- Fever >38.5
- Cough
- Wheezing
- Tachypnea
- Chest pain
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
Evaluation
- New infiltrate on CXR with at least one of the following:[1]
- Note: CXR findings may lag behind the 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
Management
- O2
- Titrate to pulse oximetry >92%
- Incentive Spirometer
- Hydration
- Oral hydration preferred
- IV hydration with hypotonic fluid if patient unable to tolerate PO
- Analgesia
- Pulmonary toilet is important but avoid excessive sedation
- Bronchodilators
- Antibiotics
- 3rd generation cephalosporin + macrolide
- Transfusion (leucocyte depleted)
- Consider transfusion to goal of hemoglobin 11 / hematocrit 30 for:
- O2 Sat <92% on room air
- hematocrit 10-20% below patient's usual hematocrit or dropping hematocrit
- 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
- Consider for:
See Also
External Links
Video
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