TESTOSTERONE LEVELS IN OBESE PATIENTS: THE ROLE OF OBSTRUCTIVE SLEEP APNEA

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madman

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Beyond Testosterone Book by Nelson Vergel
Objectives

An association between Obstructive Sleep Apnea (OSA) and gonadal dysfunction is known. Specifically, while obesity is commonly associated with reduced testosterone secretion, some studies suggest OSA can independently affect testosterone. Moreover, although most studies show that Continuous Positive Airway Pressure (CPAP) treatment does not affect testosterone levels, some revealed an improvement in testosterone after CPAP. Our study wants to investigate whether OSA independently affects testosterone in a cohort of severely obese patients, alongside other factors.


Methods

In 32 severely obese men (BMI>35 kg/m2) testosterone levels were examined in relation to anthropometrics measures (BMI; waist circumference), type 2 diabetes (T2DM)/ eating disorders, inflammatory status (VES; PCR) and night-oximetry parameters (oxygen saturation [SaO2]; mean minimal SaO2 [minSaO2]; desaturation events index [ODI]; percentage of time SaO2 <90% and <85% [% time SaO2 <90% and <85%]).


Results

In 32 patients (BMI 35-76.5 kg/m2, mean 46.2±7.8; age 19-73y, mean 54.7±14.8) a regression analysis showed inverse correlation between testosterone and BMI (p=0.0036) and waist circumference (p=0.02). No association was found with age (p=0.65), eating disorder (p=0.2) or T2DM (p=0.79). Testosterone showed a trend for correlation with minSaO2 during oximetry (p=0.06), but not with ODI (p=0.45). Multiple regression analysis confirmed inverse relation only with BMI (p=0.0049) and/or waist circumference (p=0.02), rather than presence of OSA (p=0.8) and/or CPAP (p=0.6). In OSA group (n=27) ventilation therapy results associated with higher testosterone levels.


Conclusions

Although BMI remains a key factor in hypotestosteronism, we suggest that the severity of nighttime hypoxia (minSaO2) may be an independent additional factor ,more relevant than age, diabetes, inflammation and eating disorder. Interestingly, CPAP seems to have a therapeutic effect on hypogonadism, more than the degree of ventilatory compensation achieved (minSaO2/ODI).
 

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