Effect of beta-blocker therapy on heart rate response in patients with hypertension and newly diagnosed untreated obstructive sleep apnea syndrome.

BACKGROUND: Beta1-receptor antagonists (BBs) are commonly administered in the treatment of cardiovascular disease (CVD). The reported benefits of BB use in CVD patients with concomitant obstructive sleep apnea (OSA) may be limited by their impact on apnea-induced bradycardias. Therefore the aim of the study was to test the influence of BBs on periapneic heart rate (HR) fluctuations in hypertensive patients with newly-detected and untreated OSA. METHODS: We studied 88 hypertensive patients (56 on BBs and 32 BB naive) with newly-diagnosed moderate-to-severe OSA who were free of major pulmonary comorbidities and did not require antiarrhythmic therapy. ECGs recorded during sleep were investigated for heart rate (HR) responses to apneas allowing to compare extreme HR accelerations and decelerations between the groups. RESULTS: Average sleep-time HR was comparable in BB-naive (BB-) and BB-treated (BB+) patients. Direct comparisons showed that HR decelerations were also similar in the two subgroups (53.8±9.6 vs. 54.4±7.8 bpm; P=0.78, for BB- and BB+, respectively) however, BBs blunted the OSA-induced HR accelerations (82.3±12.2 vs. 74.3±10.0; P=0.003). After adjusting for baseline HR and magnitude of desaturations, HR decelerations were more evident in BB-naive group whereas tachycardic responses remained blunted in the BB+ group. The incidence of ectopies and conduction abnormalities were comparable across two groups. CONCLUSIONS: Beta-blockers do not potentiate apnea-induced HR decelerations, attenuate apnea-induced increases in heart rate and do not influence incidence of ectopies and conduction abnormalities in patients with hypertension and moderate-to-severe, untreated OSA.

Automated detection of sleep apnea and hypopnea events based on robust airflow envelope tracking in the presence of breathing artifacts.

The paper presents a new approach to detection of apnea/hypopnea events, in the presence of artifacts and breathing irregularities, from a single-channel airflow record. The proposed algorithm, based on a robust envelope detector, identifies segments of signal affected by a high amplitude modulation corresponding to apnea/hypopnea events. It is shown that a robust airflow envelope-free of breathing artifacts-improves effectiveness of the diagnostic process and allows one to localize the beginning and the end of each episode more accurately. The performance of the proposed approach, evaluated on 30 overnight polysomnographic recordings, was assessed using diagnostic measures such as accuracy, sensitivity, specificity, and Cohen's coefficient of agreement; the achieved levels were equal to 95%, 90%, 96%, and 0.82, respectively. The results suggest that the algorithm may be implemented successfully in portable monitoring devices, as well as in software-packages used in sleep laboratories for automated evaluation of sleep apnea/hypopnea syndrome.

Intima-media thickness in patients with obstructive sleep apnea without comorbidities.

BACKGROUND: Obstructive sleep apnea (OSA) is associated with elevated risk of cardiovascular events. The early stages of vascular complications can be visualized by means of ultrasound. Intima-media thickness (IMT) correlates with the presence of risk factors of cardiovascular diseases such as hypertension, diabetes, tobacco smoking, or hyperlipidemia. However, little is known whether OSA itself may be the cause of IMT thickening. METHODS: The study group was composed of 28 patients (6 women, 22 men; mean age = 53.8 years, mean BMI = 27.1 kg/m(2), mean AHI = 22.4/h) with OSA who had no comorbidities. The control group consisted of 28 healthy subjects (6 women, 22 men; mean age = 53.9 years; mean BMI = 27.5 kg/m(2)). In both groups IMT was assessed in common carotid arteries with the use of ultrasonography. Additionally, in patients with OSA, pulse wave velocity, echocardiography, 24-h automated blood pressure monitoring, clinical signs and symptoms, and blood tests were performed to investigate possible correlations with IMT. RESULTS: Median IMT was 0.41 mm in OSA patients and 0.46 mm in the control group (p = 0.087). Echocardiography revealed left ventricle hypertrophy in 21%, systolic disorders in 8%, and diastolic disorders in 57% of the patients. In a large majority of patients, pulse wave velocity was found to be normal. IMT correlated with age (r = 0.446, p = 0.017), total cholesterol (r = 0.518, p = 0.005), daytime systolic blood pressure (r = 0.422, p = 0.025), pulse pressure 24 h and daytime (r = 0.424, p = 0.027 and r = 0.449, p = 0.019), early mitral flow/atrial mitral flow (E/A) (r = -0.429, p = 0.023), and posterior wall diameter (PWD) (r = 0.417, p = 0.270). CONCLUSION: In a relatively nonobese group of patients, no significant differences were found in the intima-media thickness between OSA patients without concomitant cardiovascular diseases and healthy controls. This may lead to the conclusion that IMT does not reflect increased risk of cardiovascular events in patients with isolated OSA.

[Isolated sarcoidosis of upper respiratory tract--a description of 2 cases]. / Izolowana sarkoidoza górnych dróg oddechowych--opis 2 przypadków.

Sarcoidosis is a granulomatous disease of unknown etiology. In sarcoidosis almost all organs can be involved but the disease most often affects the lungs and intrathoracic lymph nodes. Isolated extrapulmonary organs involvement occurs very seldom. We present two cases of sarcoidosis limited to upper respiratory tract--a young woman with laryngeal sarcoidosis and recurrent throat pain, and a woman with disease of the sinuses and pharynx and clinical symptoms of chronic sinusitis poorly responsive to conventional treatment.

[The effects of pulmonary rehabilitation on the quality of life in patients with COPD]. / Wplyw rehabilitacji na jakosc zycia u chorych na przewlekla obturacyjna chorobe pluc.

INTRODUCTION: Chronic obstructive pulmonary disease (COPD) is a leading cause of morbidity, hospitalization and disability among lung diseases. Its chronic, progressive nature and acute exacerbations influence the quality and expectancy of life of COPD patients. The pulmonary rehabilitation is a basic non-pharmacological intervention in COPD and its role is increasing in recent years. The goal of this work was to evaluate the impact on quality of life patients undergoing 3 weeks pulmonary rehabilitation program. MATERIAL AND METHODS: 132 patients with COPD were admitted to pulmonary rehabilitation program; 70 completed the 3 weeks long program. Pulmonary function tests, exercise endurance, quality of life (St. George's Respiratory Questionnaire) were measured at baseline, 3 weeks, and 3 months. RESULTS: There was significant improvement in quality of life in St. George's Respiratory Questionnaire and exercise endurance (treadmill) measured at 3 weeks and at 3 months. Parameters of lung function tests did not improved after completion of rehabilitation. CONCLUSIONS: 3 weeks pulmonary rehabilitation program of patients with COPD was effective in improving exercise endurance and the quality of life. The improvement was noted as well at 3 months post rehabilitation.

[Assessment of hemoptysis etiology among patients hospitalized in Pneumonology Departament of Medical University of Gdansk in the years 1998-2002]. / Analiza przyczyn krwioplucia u chorych hospitalizowanych w Klinice Chorób Pluc i Gruzlicy Akademii Medycznej w Gdansku w latach 1998-2002.

A retrospective analysis of 3400 clinical records of patients hospitalized in Pneumonology Department of Medical University of Gdansk between 1998-2002 year was performed. 431 (12,7%) of them was admitted to hospital because of hemoptysis. The cause of hemoptysis was determined in 380 (82,2%) cases. The most common diagnosis was neoplasm--174 cases (40,4%), between them squamous cell carcinoma (47,7%). In 51 cases (11,8%) the etiology of hemoptysis was undetermined.