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SYMPOSIUM: EMBOLISM IN THE INTENSIVE CARE UNIT
Year : 2013  |  Volume : 3  |  Issue : 1  |  Page : 64-68

Fat embolism syndrome


Department of Surgery, Cooper University Hospital, Division of Trauma Surgery, Camden, NJ, USA

Date of Web Publication22-Mar-2013

Correspondence Address:
Michael E Kwiatt
Department of Surgery, Cooper University Hospital, Office of Surgical Education, 3 Cooper Plaza, Suite 411, Camden, NJ
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2229-5151.109426

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   Abstract 

Fat embolism syndrome (FES) is an ill-defined clinical entity that arises from the systemic manifestations of fat emboli within the microcirculation. Embolized fat within capillary beds cause direct tissue damage as well as induce a systemic inflammatory response resulting in pulmonary, cutaneous, neurological, and retinal symptoms. This is most commonly seen following orthopedic trauma; however, patients with many clinical conditions including bone marrow transplant, pancreatitis, and following liposuction. No definitive diagnostic criteria or tests have been developed, making the diagnosis of FES difficult. While treatment for FES is largely supportive, early operative fixation of long bone fractures decreases the likelihood of a patient developing FES.

Keywords: Fat embolism, fat embolism syndrome, trauma


How to cite this article:
Kwiatt ME, Seamon MJ. Fat embolism syndrome. Int J Crit Illn Inj Sci 2013;3:64-8

How to cite this URL:
Kwiatt ME, Seamon MJ. Fat embolism syndrome. Int J Crit Illn Inj Sci [serial online] 2013 [cited 2019 Dec 6];3:64-8. Available from: http://www.ijciis.org/text.asp?2013/3/1/64/109426


   Overview Top


Over 150 years ago, Zenker described the first case of fat embolism syndrome (FES) in a patient suffering from crush injury. [1] While FES was later clinically diagnosed and often reported in the literature over the next 100 years, Gurd's clinical description of the FES renewed interest in studying this syndrome. [2],[3]

Fat embolism is the presence of fat particles within the microcirculation, while FES is the systemic manifestation of fat emboli within the microcirculation. Common systemic manifestations include respiratory distress, altered mental status, and a rash.

FES is most often associated with orthopedic trauma. Rare cases of FES have been reported to occur following bone marrow transplantation, osteomyelitis, pancreatitis, alcoholic fatty liver, and even liposuction. [4] Since most cases of FES occur following orthopedic trauma, available research focused on FES in orthopedic trauma patients.


   Epidemiology Top


Fat embolization occurs frequently following orthopedic trauma. Fat globules have been detected in the blood of 67% of orthopedic trauma patients in one study. [5] This number increased to 95% when the blood is sampled in close proximity to the fracture site. [6]

Hypoxemia may suggest fat embolization causing subclinical FES. Almost all patients monitored with continuous pulse oximetry following a long-bone fracture will have episodes of hypoxemia. [7]

Further embolization may occur during operative fixation. Intraoperative transesophageal echocardiogram studies have detected fat embolization in 41% of patients during the fixation of long-bone fractures. [8]

While almost all patients will have fat globules detected in the blood or develop transient hypoxia, the incidence of FES is much lower. In his initial study defining the clinical criteria for FES, Gurd reported the incidence of FES as 19% in a group of trauma patients. [9] As early operative fixation of long-bone fractures has become standard care, modern studies report an incidence of FES between 0.9% and 11%. [10],[11],[12]


   Pathophysiology Top


Fat particles enter the circulation and cause damage to capillary beds. While the pulmonary system is most frequently affected, fat embolism can occur in the microcirculation of the brain, skin, eyes, and heart can be involved.

The two leading theories for the formation of fat embolism are the mechanical theory and biochemical theory. The mechanical theory proposes that obstruction of the systemic vasculature by fat embolism occurs from the direct release of bone marrow into the venous system following trauma. An elevated intramedullary pressure following trauma leads to the release of fat through open venous sinusoids. The embolized fat obstructs capillary beds. While this accounts for embolisms within the pulmonary capillaries, the theory does not explain embolisms within the systemic capillaries beds. Patients have been shown to have systemic fat embolization without a patent foramen ovale. [13]

The biochemical theory provides an alternate explanation for fat embolization. This theory proposes that the inflammatory response to trauma causes the release of free fatty acids from the bone marrow into the venous system. The elevated free fatty acids as well as the inflammatory mediators cause damage to capillary beds. Elevated free fatty acid levels have been associated with hypoxemia. [14] Free fatty acids have also been shown to induce inflammation within the lungs. [15]

Regardless of the mechanism initiating fat embolism, the end result is an intense inflammatory response. Capillary beds develop increased permeability and inflammatory mediators damage surrounding tissues. In the lungs, this induces lung injury that is indistinguishable from ARDS.


   Clinical Presentation Top


Embolized fat droplets can travel to microvasculature throughout the body. FES is, therefore, a multiorgan disease and can damage any microcirculatory system within the body. Fat has been reported to embolize to the lungs, brain, skin, retina, kidneys, liver, and even the heart. [16]

Presenting signs are nonspecific and include tachypnea, tachycardia, and fever. Patient may have a petechial rash. Specific symptoms are dependent on the organ systems involved.

The pulmonary circulation is most commonly affected in FES, with up to 75% of patients experiencing respiratory depression. [17],[18] The degree of respiratory dysfunction can range from mild hypoxia requiring supplemental oxygen to ARDS requiring prolonged mechanical ventilation. Patients may decompensate rapidly to respiratory failure, especially during manipulation of fractures whilemoving the patient or setting the fracture in the operating room. This must especially be taken into consideration while in the operating room; an anesthetized patient may develop acute hypoxia secondary to FES.

FES can cause nonspecific neurological symptoms. Symptoms are believed to arise from cerebral edema rather than ischemia, so symptoms are nonlateralizing. [19] Patients may become lethargic or restless. A change in Glasgow coma scale (GCS) may suggest the development of cerebral edema due to FES. In the setting of severe cerebral edema the patient may become unresponsive. [20]

Dermal involvement results in a petechial rash, reported in approximately 50% of patients. [21] This rash tends to be transient, lasting less than 24 h. While the torso is most commonly affected, the entire dermis and even mucosal membranes can be involved.

Microvascular injury of the retina results in hemorrhagic lesion of the retina, seen in 50% of patients. [22] These lesions are self-limited, disappearing within weeks. [23] Residual visual deficits are uncommon.

Patients may also develop thrombocytopenia or a decrease in hemoglobin in FES.


   Diagnosis Top


Since FES is a heterogeneous disease with no pathognomonic features, its diagnosis can be challenging. Gurd proposed a of clinical criteria for diagnosing FES in 1970 that he later modified with Wilson [4],[5] [Table 1]. Schonfeld has suggested a scoring system to helpin diagnosis[24][Table 2], while Lindeque proposed that FES can be diagnosed based on respiratory changes alone[25] [Table 3]. None of these criteria have been validated or have been universally accepted.
Table 1: Gurd and Wilson's criteria for FES

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Table 2: Schonfeld's scoring system for FES

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Table 3: Lindeque's criteria for FES

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In the acute setting respiratory distress is the most clinically significant feature of FES. Respiratory distress from FES is indistinguishable from ARDS seen in polytrauma patients. White has suggested defining FES as ARDS with additional organ involvement due to bone trauma.[26]

Laboratory and imaging tests can helpin the diagnosis, but are nonspecific. Patients will demonstrate hypoxemia while on room air on arterial blood gas. Chest x-ray will often show diffuse interstitial infiltrates while chest CT scan will show diffuse areas of vascular congestion and pulmonary edema.

Attempts at developing specific test for FES have been disappointing. Biologic markers such as lipase, free fatty acids, and phospholipase A2 have all been shown to be elevated in patients with FES; however, this elevation is nonspecific in patients with lung injury. Microscopic examination of blood, urine, or sputum may show fat globules, but again this finding is nonspecific.

Bronchoalveolar lavage (BAL) has been heavily investigated as a diagnostic tool for FES.[27],[28],[29] Lipid inclusions within macrophages can be quantified BAL. BAL though is invasive and time intensive. It has not become widely used in diagnosing FES.

With the absence of specific tests or criteria the diagnosis of FES is dependent on the clinical acumen of the treating physician. It should be clinically suspected in patients with respiratory distress or a petechial rash and are at high risk for developing FES.


   Treatment Top


Pharmacologic interventions

Therapeutic treatments developed specifically for FES have been largely unsuccessful. Early experiments attempted to use dextrose to decrease free fatty acid mobilization or ethanol to decrease lipolysis; however, neither have shown clinical benefits. [30],[31] Anticoagulation with heparin was found to be beneficial in animal models but is no longer commonly used in clinical practice due to the risk of bleeding and unproven benefits. [32],[33],[34]

Corticosteroidtherapy has been proposed as a potential therapy for FES by limiting free fatty acid levels, stabilizing membranes, and inhibiting complement mediated leukocyte aggregation. Meta-analysis of seven randomized trials using prophylactic corticosteroids in patients with long-bone fractures found that corticosteroids reduce the risk of FES by 77% (95% CI: 40-91%). [35] This same trial reported no difference in mortality, infection, or avascular necrosis in patients treated with corticosteroids compared to control patients. This meta-analysis, though, included only one recent trial. A 2004 randomized trial found no difference in incidence of FES between patients treated with methylprednisolone. [7]

While still controversial, some clinicians administer corticosteroids to patients with long-bone fractures as FES prophylaxis. Methylprednisolone is the most commonly used steroid and dosages range from 6 to 90 mg/kg.

Placement of inferior venal cava filters has been advocated as a method to reduce showering of emboli to the pulmonary vasculature. IVC filters as a prophylactic treatment to prevent FES have not been sufficiently studied.

Supportive treatment

Once a patient develops FES the only proven treatment is supportive care of the involved organ systems. Supplemental oxygen may be required to improve oxygenation. If ARDS develops the patient may require mechanical ventilation while recovering from lung injury. Patients may require intravenous fluid for resuscitation to avoid developing shock. In severe cases, in which a fat pulmonary embolism causes, right ventricular failure ionotropic support with dobutamine may be necessary. [36]

Patients with neurological manifestations require frequent neurological examinations and documentation of Glascow Coma Scale to assess for neurologic deterioration. Rapid deterioration may develop from increased cerebral edema. [20] Patients with FES and cerebral edema may benefit from placement of an intracranial pressure monitor in order to direct treatment of cerebral edema. [37]

Operative fixation

Early operative fixation of long-bone fractures is advocated to reduce the incidence of FES. In the long-bone, fractures were treated conservatively with prolonged immobilization, with the incidence of FES in these patients reported as 22%. [38] The movement of fracture ends prior to operative fixation have been shown to result in transient showering of fat embolism. [39] Cytokines remain persistently elevated in patients undergoing conservative treatment and then return to normal after operative fixation. [40]

The use of internal fixation devices for treatment of long bone fractures was accompanied by a reduction in the incidence of FES. [41] Several retrospective studies have also reported decreased incidence of FES with use of internal fixation devices. [11],[42],[43],[44],[45],[46],[47] Johnson et al. further demonstrated that patients undergoing fixation urgently had an incidence of ARDS of 7% compared to an incidence of ARDS of 39% in patients that had fixation delayed by more than 24 h. [43]

Increased intramedullary pressure during fixation increases the amount of fat emboli entering the circulation. [48] Care must be taken during operative fixation to limit intramedullary pressure.

While reaming may increase intramedullary pressure, reaming has not been shown to increase the incidence of FES. A randomized trial comparing pulmonary complications in patients undergoing fixation with reamed nailing and unreamed nailing found no difference between the two groups. [49] When assessed with transesophageal echocardiography, patients undergoing fixation with reamed and unreamed nails had visible pulmonary embolism. [50]

Surgical techniques to reduce embolization including drilling holes in the cortex to reduce intramedullary pressure, lavaging bone marrow prior to fixation to reduce marrow for embolization, venting of the femur, use of a bone-vacuum, and use of tourniquets to prevent embolization have been attempted. None of these have clearly been shown to reduce FES. [51],[52],[53],[54],[55]

Morbidity and mortality

With supportive care and early fixation FES has a favorable outcome. The most significant morbidity is associated with the development of ARDS. However, most patients can expect a complete recovery of pulmonary, neurologic, and retinal abnormalities. Mortality rates from FES in modern studies utilizing supportive measures and early operative fixation report the mortality from FES between 7% and 10%. [9],[10]


   Conclusion Top


FES most commonly presents with respiratory distress in orthopedic trauma patients. No specific diagnostic tests or criteria exist, so the syndrome is most often a diagnosis of exclusion. Therapy is most often directed at treatment of ARDS and support of other organ systems affected by fat embolization. Early operative fixation long-bone fractures have reduced the incidence of FES.

 
   References Top

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    Tables

  [Table 1], [Table 2], [Table 3]


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