Difficulty swallowing is one of the most common complications of anterior cervical spine surgery (ACSS). Investigators who evaluated possible risk and contributing factors report in Advances in Communication and Swallowing that although most difficulties resolve within two months, the perception of swallowing difficulty can persist for longer, but this does not always correlate with test results.
More than 70% of patients report dysphagia symptoms within two weeks following ACSS. Contributing factors may include extent of surgery, prevertebral soft tissue swelling, or altered sensation secondary to nerve traction during surgery.
“We see many patients suffering with this problem after ACSS,” explained lead investigator Ashli K. O’Rourke, MD, Medical University of South Carolina. “The perception of swallowing difficulty can persist for more than two months following ACSS but often does not correlate with current gold standard testing. This can be a frustrating situation for patients who are given no specific explanation for their complaints.”
Investigators examined post-operative swallowing changes in patients with dysphagia following ACSS compared with healthy age- and gender-matched individuals. They undertook this study to evaluate possible risk or contributing factors so that they could better identify patients who may be at risk and counsel patients more effectively before surgery. They also wanted to determine if there was a timepoint after surgery when dysphagia was likely to resolve due to improvement in factors such as prevertebral soft tissue swelling, sensation changes, or temporary nerve irritation after surgery.
Eligible patients were identified using electronic medical records to cross-reference patients who underwent both ACSS and a videofluoroscopic swallow study (VFSS), also referred to as the modified barium swallow study, between January 2010 and October 2018. Medical records were then reviewed to ensure patients had new onset of subjective complaints of dysphagia after surgery (e.g., food sticking, coughing during meals) prompting a referral for VFSS. Patients with pre-existing documented dysphagic complaints, altered diets, or gastric tube placement were excluded.
Once all VFSS records meeting the criteria were obtained, these patients were categorized into two groups based on the duration of post-operative dysphagia. Patients in the “early” group presented for VFSS two months post-surgery, while patients in the “late” group had dysphagia that persisted more than two months post-surgery. Seventy-five patients with new onset of dysphagic complaints following ACSS were included in the study. The mean age of the early post-operative group was 61.5 years, 40% of whom were women. The late post-operative group had a mean age of 52.6 years, 60% of whom were women. Therefore, the mean age of the early post-operative group was significantly higher than the late group, although gender distribution was somewhat comparable between groups.
Investigators found that patients in the early phase of recovery had significantly more swallowing impairment and a higher incidence of material entering the lungs (aspiration) compared to healthy controls and patients in the late phase of recovery. Their findings agreed with previous studies that also showed improvement in swallowing after two months post-ACSS, with most patients able to return to normal diets shortly thereafter. The thickness of the throat/neck tissues was significantly greater in the ACSS patients at all time points following their surgery compared to healthy individuals. However, their results revealed that chronic increased neck tissue thickness was not associated with impairments on X-ray testing to explain the patients’ dysphagia symptoms.
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