R. Patel et al. / Case Reports in Clinical Medicine 2 (2013) 505-507
Copyright © 2013 SciRes. OPEN ACCESS
507
through the temporalis muscle is within the hairline and
more aesthetic, penetration of the pins through the tem-
poralis muscle is painful and may impede the ability to
chew without discomfort. The bone underlying this area
is also thinner and prone to puncture with repeated pin
loosenin g [9] .
Initial pin placement requires appropriate torque to
prevent loosening and possible skull penetration. Rizzolo
et al. [10] compared 102 patients with a pin torque of
either 6 or 8 inch-pounds. Thosepins inserted with 6
inch-lbs torque had fewer complications, including loos-
ening, infection, pin change, or loss of pin. Pande et al.
[11] reported a case of transient brain injury from pin
penetration into thetemporoparietal region of the brain
[11]. This developed 6 hours after the halo was retight-
ened. The patient demonstrated drowsiness, facial
asymmetry, and a weak left hand grip. There was no in-
fection and the patient recovered. The pin was replaced.
Poor pin site hygiene can also lead toinfection. Water
and mild soap are recommended for cleaning the sites.
Agents including povidone-iodine, hydrogen peroxide,
and chlorhexidine have shown higher infection rates [12].
Also, excessive cleaning can lead to excess granulation
tissue around the pins and subsequent loosening.
Re-tightening of the pins generally occurs at 24 hours
and again after 1 week. Also routine follow up should be
done at 4 - 6 week inter vals.
Antibiotic therapy has been more successful when
begun prior to actual abscess formation. Once an abscess
develops, surgical evacuation completed with antibiotic
therapy becomes the only available option. Some cases
have presented as orbital pain, aphasia, seizure, lethargy,
disorientation, or psychosis [13,14]. As previously men-
tioned, even if adequately treated, these symptoms can
be associated with serious long term cerebral paren-
chyma damage. These include interference with the nor-
mal propagation of electrical impulses, and the site now
becomes a potential seizure focus [5 ,6].
3. CONCLUSION
Patients with halo placement are often in the ICU.
Awareness of potential complications from these devices
must be part of the clinicians’ competence. Those with
halo pins and a clinical picture suggestive of infection
require close and detailed evaluation. Pin site infection
should be promptly treated to prevent pin penetration
into the brain and possible deep cranial infection. Early
recognition may reduce morbidity.
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