Intracranial cavernous hemangiomas (CHs) are highly vascular tumors, and they have
high propensity for bleeding. Fibrin sealants are often used in neurosurgery to achieve
hemostasis when other techniques are impractical or ineffective. We report a case
of pulmonary embolism probably following fibrin sealant application in a case of intracranial
CH.
A woman of age 38 years, weight 48 kg, height 145 cm, and ASA (American Society of
Anesthesiologists) physical status 1 presented with recurrent headache with nausea
and decreased vision in the right eye for 1 year. She was diagnosed to have a 3.3-
× 3.1 -cm CH in the right suprasellar region with right optic nerve compression. She
was scheduled for resection under general anesthesia in supine position. She did not
have any systemic abnormalities, had not undergone any previous surgery, and her routine
investigations were normal. A standard anesthesia technique of thiopentone, fentanyl,
vecuronium, isoflurane, and oxygen with nitrous oxide was used. The patient had a
stable course intraoperatively until surgeons applied fibrin sealant to achieve hemostasis.
Just after that, we noticed a fall in end-tidal CO2 (ETCO2) (drop to 20 mm Hg from 33 mmHg in 2–3 minutes) along with tachycardia and hypotension.
The patient's airway pressure remained stable. The rapidity of the event led us to
assume pulmonary embolism to be the most probable cause of the event. However, it
was difficult for us to differentiate between air embolism and other substances causing
embolism as we solely relied on ETCO2. The serial arterial blood gas (ABG) tests showed a decrease in PaO2 and an increase in PaCO2. Attempts made to aspirate air through central venous access were unsuccessful. With
fluids, blood transfusion, and vasopressor (IV ephedrine), hemodynamics improved and
ETCO2 and hemodynamics normalized within next 10 minutes. The remaining procedure was uneventful,
and the patient was shifted to intensive care unit (ICU) with tracheal tube in situ.
She had a stable ICU stay, and her trachea was extubated after 12 hours. A chest radiograph
the next day showed no change in appearance, and she was shifted to the ward the next
day. Our patient had sudden decrease in ETCO2, and the possible causes could be breathing circuit disconnection, venous air embolism
(VAE), acute hypotension, and pulmonary embolism due to any cause.[1] We did not think about VAE to be the cause because of absence of any predisposing
factors, that is, incision of noncollapsible vein in presence of subatmospheric pressure
in these veins, or during surgeries performed with the patient in sitting position.[2] Likewise, acute hypotension can cause fall in ETCO2, but the fall is usually gradual. We ruled out breathing circuit disconnection as
well. Therefore, the most probable cause was pulmonary embolism from some sources.
As there was no predisposing factor or suggestive history of deep vein thrombosis
or injury to the long bone or any orthopedics intervention, we ruled out pulmonary
thromboembolism, fat embolism, or embolism due to bone cement. With this, our differential
diagnosis was narrowed down to pulmonary embolism due to fibrin sealant application.
Fibrin sealant is a mixture of fibrinogen, thrombin, and aprotinin. It is extensively
used as a hemostatic, sealing agent, and adhesive agent. FG leads to cessation of
bleeding by rapid polymerization within the dilated vessel.[3] There are reports of pulmonary embolism after the use of fibrin sealant in children
with facial hemangima.[4] Another possibility was anaphylaxis/hypersensitivity due to fibrin sealant use.[4]
[5] We ruled out anaphylaxis as there was no previous history of surgery in the patient
and the clinical presentation was different. Another important aspect is possibility
of air or gas embolism with the use of spay device with the fibrin sealant.[5] However, we have not used spray devices in our patient. To our knowledge, this is
the first case report describing a pulmonary embolism following fibrin glue injection
into an intracranial CH. Probably the higher vascularity and dilated venous channels
in the tumor facilitated the pulmonary embolism in our case. Pulmonary glue embolism
is difficult to diagnose, and the treatment is mostly symptomatic. However, in more
severe cases systemic heparinization might be required.[6] With this case report, we want to emphasize that the anesthesiologist should have
a high index of suspicion for its occurrence in the setting of hypocarbia, hypoxemia,
and tachycardia after injection of fibrin sealant.
