The pure effects of obstructive sleep apnea syndrome on cardiac autonomic functions: heart rate turbulence analysis.

OBJECTIVES: To demonstrate the pure effect of obstructive sleep apnea syndrome (OSAS) on cardiac autonomic function (CAF) using heart rate turbulence (HRT) parameters. PATIENTS AND METHODS: A total of 64 patients with OSAS and 30 age- and gender-matched healthy subjects were enrolled. All subjects had normal coronary arteries and were free from diabetes mellitus (DM) and hypertension (HT). The HRT parameters (TO, turbulence onset; TS, turbulence slope) were obtained from 24-h ambulatory electrocardiogram (ECG) recordings. HRT parameters were compared between groups, and the relationship between HRT and the apnea-hypopnea index (AHI) was examined. RESULTS: No between-group differences were found in age or gender. Mean TO was significantly higher in the OSAS group than in healthy controls (0.89 ± 0.5, -0.08 ± 0.26; p < 0.001; respectively). The mean TS did not differ between the two groups (2.81 ± 3.06 versus 3.14 ± 2.33; p = 0.212). The AHI was positively correlated with TO (r = 0.845, p < 0.001). The multiple logistic regression analysis revealed that after adjustment for other variables, TO was a significant and independent predictor of AHI, OR 2.394 (95% CI: 1.596-3.591). CONCLUSIONS: HRT (TO in particular) is correlated with AHI. Thus, impaired HRT may be an important factor underlying the occurrence of arrhythmia and sudden cardiac death in patients with OSAS.

Another advantage of nasal septal suturing: pulmonary function unaffected.

BACKGROUND: Nasal packing (NP) after septoplasty has some negative aspects. The nasal septal suture (NSS) is therefore becoming increasingly preferred. OBJECTIVE: The aim of this study was to analyze the effects of NSS and NP on pulmonary function tests. METHODS: Sixty patients who suffered from nasal blockage resulting from nasal septal deviation and who were otherwise healthy were included. Patients were randomized into two groups, NP or NSS. Pre-operative spirometry was performed for all patients. The NP group received a finger glove packing for two days after septoplasty, whereas no additional dressing was used for the NSS group. Narcotic analgesics were not used for pain relief after septoplasty in either group. Spirometry was performed post-operatively on the third day for all patients and before removal of the NP for the NP group. RESULTS: We observed statistically significant differences between pre-operative and post-operative values of forced vital capacity (FVC; p = 0.008), forced expiratory volume in the first second (FEV1; p = 0.006), and forced expiratory flow ((FEF)25-75%; p = 0.011) in the NP group. In comparison, pre-operative and post-operative values did not differ for FVC, FEV1, FEV1/FVC%, and FEF25-75% in the NSS group. CONCLUSION: NP negatively influenced pulmonary function based on spirometric parameters, while NSS did not.