Quantifying Long QT Syndrome in Obese Sleep Apnea Patients Undergoing Roux-en-Y Gastric Bypass Surgery

Area of Science:

• Cardiology
• Sleep Medicine
• Bariatric Surgery

Background:

• Obstructive Sleep Apnea/Hypopnea Syndrome (OSAHS) is linked to obesity and Long QT Syndrome (LQTS).
• Weight reduction surgery, like Roux-en-Y Gastric Bypass (RYGB), has shown promise in improving LQTS and OSAHS symptoms in obese patients.
• The long-term impact of RYGB on LQTS in OSAHS patients requires further investigation.

Purpose of the Study:

• To evaluate changes in QT and QTc intervals in obese OSAHS patients following RYGB surgery and weight reduction.
• To compare these changes with a control group of non-apneic individuals who underwent the same procedure.
• To assess the reversibility of LQTS in OSAHS patients after significant weight loss.

Main Methods:

• Development of an algorithm to detect ECG waveforms and calculate QT and QTc intervals.
• Pre- and post-operative ECG measurements were taken for four obese OSAHS patients and three non-apneic controls.
• Comparison of QT and QTc intervals between the groups before and after RYGB surgery.

Main Results:

• RYGB surgery resulted in significant weight loss and reduction in OSAHS symptoms for all participants.
• Obese OSAHS patients showed persistent, potentially non-reversible, LQTS despite substantial weight reduction post-RYGB.
• Control subjects also experienced weight loss and improvements, but their baseline QT/QTc intervals were not detailed in relation to LQTS.

Conclusions:

• RYGB surgery is effective for weight management and alleviating OSAHS symptoms.
• Obese patients with OSAHS may experience non-reversible Long QT Syndrome, even after successful bariatric surgery and weight loss.
• Further research is needed to understand the long-term cardiac implications for OSAHS patients post-RYGB.