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Obstructive sleep apnoea syndrome (OSAS) is a common disorder associated with upper airway muscle dysfunction. Agents that improve respiratory muscle performance may have considerable therapeutic value. We examined the effects of acute exposure to sustained and intermittent hypoxia on rat pharyngeal
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What is the central question of this study? Chronic intermittent hypoxia (CIH) is a dominant feature of respiratory control disorders, which are common. We sought to examine the effects of exposure to CIH during neonatal development on respiratory muscle form and function in male and
Patients with chronic obstructive pulmonary disease (COPD) may have poor inspiratory muscle function, which reduces minute and alveolar ventilation, leading to increased hypoxemia and slow pulmonary oxygen uptake kinetics. However, little is known about the effect of inspiratory muscle weakness
We investigated the relationship between nasal flaring and SpO2 in 19 patients with Duchenne muscular dystrophy (DMD) and 26 patients with myotonic dystrophy (DM1). In DMD patients, nasal flaring was observed when SpO2 was lower than 96%, while it was not seen even at 82% of SpO2 in DM1. None of the
In this study, we examined the usefulness of arterial blood gas variables, as changed by the hypoxic stimulus, in discerning various experimentally-induced conditions of diaphragm weakness in anesthetized cats. We defined three experimental situations (models): (i) intact muscle, statistical Class
The effects of acute hypoxia on the diaphragm are largely unknown despite the clinical relevance to respiratory conditions such as acute respiratory distress syndrome and ventilator-induced lung injury. Adult male C57BL6/J mice were exposed to 1, 4 or 8h of hypoxia (FiO2=0.10) or normoxia.
Duchenne muscular dystrophy (DMD) is a progressive striated muscle disease that is characterized by skeletal muscle weakness with progressive respiratory and cardiac failure. Together respiratory and cardiac disease account for the majority of mortality in the DMD patient population. However, little
We report a 37-year-old woman with slowly developing muscular weakness for 2 years following insidious stiffness of calf muscle. Serum CK was elevated up to 4,207 IU/l. She presented sleepiness, weakness of proximal and truncal muscles and systemic muscular atrophy. While she had not experienced
OBJECTIVE
Patients who have had a stroke are at risk of hypoxia through alterations in the central regulation of respiration, through aspiration, and through respiratory muscle weakness. Sleep-related breathing disorders are common and may lead to episodes of nocturnal hypoxia even when daytime
Obstructive sleep apnoea syndrome (OSAS) is a common respiratory disorder characterized by chronic intermittent hypoxia (CIH). We have shown that CIH causes upper airway muscle dysfunction in the rat due to oxidative stress. Ageing is an independent risk factor for the development of OSAS perhaps
Obstructive sleep apnoea syndrome (OSAS) is a devastating respiratory control disorder more common in men than women. The reasons for the sex difference in prevalence are multifactorial, but are partly attributable to protective effects of oestrogen. Indeed, OSAS prevalence increases in
OBJECTIVE
The cause of ulnar drift in patients with rheumatoid arthritis (RA) is unknown. It may occur because of external forces applied to the fingers during normal use. Alternatively, it may arise after changes in the internal forces on the anatomy of the digits owing to alterations in the
A 28-year-old woman, 35 week-pregnant, underwent emergency cesarean section. Although she had no apparent symptoms before the operation, myotonic dystrophy was suspected from physical examination and laboratory data. The anesthesiologist in charge recognized only high creatine kinase. Combined
Previous studies have shown that high-altitude hypoxic hypoxia is associated with reduced ventilatory capacity that may be related to skeletal muscle weakness. In the present investigation, ascent to high altitude (4,000 m) was simulated experimentally by exposure of male rats (Sprague-Dawley,
Oxygen deficit (hypoxia) is a major feature of cardiorespiratory diseases characterized by diaphragm dysfunction, yet the putative role of hypoxic stress as a driver of diaphragm dysfunction is understudied. We explored the cellular and functional consequences of sustained hypoxic stress in a mouse