What Researchers Did
Researchers conducted a retrospective study to examine the link between idiopathic sudden sensorineural hearing loss (ISSNHL) and the presence of a right-to-left shunt (RLS).
What They Found
Among 40 patients with ISSNHL, a right-to-left shunt was detected in 20 patients (50%). Patients with RLS were significantly younger (p = 0.007) and more often experienced vertigo, while those without RLS more frequently had comorbidities like hypercholesterolaemia, hypertension, and hyperglycaemia. The "no RLS" group showed the highest rate of complete hearing recovery at 40%, though this difference was not statistically significant.
What This Means for Canadian Patients
For Canadian patients experiencing ISSNHL, this research suggests that a right-to-left shunt is a common finding, particularly in younger individuals who present with dizziness and fewer typical comorbidities. Identifying RLS through a trans-cranial Doppler ultrasonography (TCD) could help categorize patients and potentially guide treatment approaches for this Health Canada-recognized indication for hyperbaric oxygen therapy.
Canadian Relevance
Idiopathic sudden sensorineural hearing loss (ISSNHL) is a Health Canada-recognized indication for hyperbaric oxygen therapy. No direct Canadian connection, authors, or study location were identified.
Study Limitations
This retrospective study involved a small cohort of 40 patients, and the trans-cranial Doppler ultrasonography used could not pinpoint the exact location of the detected shunts.