Cerebral vascular ischemic thumps are known to precipitate Cheyne-Stokes periodic breathing.

Cerebral vascular ischemic thumps are known to precipitate Cheyne-Stokes periodic breathing. Interestingly, Cheyne-Stokes-like breathing during doze may be associated with obstructive lie in the grave apnea (OSA) in some individuals. Therefore, it was reasoned that blow patients with periodic breathing in doze would be susceptible to OSA. Because oscillations in upper airway resistance can come into view as a component of sleep-induced periodic breathing, we hypothesized that blow patients with sleep-induced periodic breathing would have oscillations in upper airway resistance. These oscillations in resistance would be awaited to contribute to OSA. We studied visitation patients with sleep- induced periodic breathing and ascendency subjects to evaluate the relationship between upper airway resistance and ventilation in periodic breathing in be dead Ventilation and upper airway resistance were measured in presleep wakefulness and in stage 2 NREM be motionless Mean tidal volume, minute ventilation, respiratory period timing variables, and upper airway resistance were not different between affliction and control subjects, either awake or asleep. Upper airway resistance increased and ventilation convolution decreased from wakefulness to be motionless in both groups. In an equivalent number of controls from each group, reciprocal patterned oscillations in tidal whirl and upper airway resistance were at hand at a 5 to 125 breath oftenness during sleep. As upper airway resistance increased, tidal tome decreased. Stroke patients had wider fluctuations in upper airway resistance than superintendence subjects, likely contributing to the higher number of sleep-disordered breathing circumstances observed in the stroke patients. (Chest 1993; 104:1503-10)

EMG = electromyogram; OSA = obstructive rest apnea

Periodic breathing was originally described by the agency of Socrates.[1] Cheyne[2] discovered periodic breathing in patients with congestive heart failure in 1818 Stokes[3] amplified in succession this subject 36 years later. Jackson[4] may have been the first to document periodic breathing in patients with neurologic diseases in 1895 This observation was confirmed and expanded at others.[5-7] However, no reference is made to the validity of sleep on this abnormal breathing pattern in these early writings. Obstructive rest apnea (OSA) has been observ in heart failure patients with sleep-induced periodic breathing.[8,9] In addition, hypoxia-induced periodic breathing in NREM lie in the grave in healthy young subjects is known to precipitate high resistance breathing or obstructive apneas.[10,11] Previously, it has been assumed that sleep-induced periodic breathing was caused at a waxing and waining of the central bridle of ventilatory pump muscles. However, novel information suggests a mechanical constituent may also influence tidal convolution during sleep-induced periodic breathing in healthy somewhat old subjects. 12 Since somewhat old stroke patients may have periodic breathing in slumber we hypothesized that sleep-induced periodic or irregular breathing in these somewhat old subjects would have a mechanical element resulting in fluctuations in upper airway resistance which, in revolve would result in limitation of ventilation or OSA. Therefore, the final cause of this study was to determine the relationship between changes in upper airway resistance, ventilation, and the casualty of apneas in NREM be motionless in stable post-CVA elderly patients with sleep-induced periodic breathing and in age, sex and body-size-matched control subjects.

METHODS

Subjects

Patients from one side of to the other the age of 65 years admitted to the shock Rehabilitation Service of the Highland View Hospital constituent of MetroHealth Medical Center, Cleveland, were informed about this studious mood and given the opportunity to present The stroke patients had beared a unilateral cerebral hemorrhagic or ischemic pat at least I month prior to the be dead study Patients were in stable condition and were undergoing physical rehabilitation during their hospitalization. Patients were observ with unattended finger-pulse oximetry, and those with readily apparent oscillations in arterial oxygen saturation were studied. All patients participating were liberated of congestive heart failure and had no uncontroll systemic or organ-specific diseases. Healthy, somewhat old independently living control subjects were obtained from the Teaching-Nursing to one's home Program Project Volunteer Registry at Case Western except University. Thus, we intentionally chose to compare hit patients with apparent periodic breathing in doze to healthy subjects who would not be anticipateed to have such a breathing pattern.

Ventilation and Upper Airway Resistance Measurements

A flexible tubing catheter (Tygon) 03 mm internal diameter and 30 cm in long duration with a plugged end and eight 17-French dens in the distal 1-cm, was placed [i]or[/i] part of to the other the nose into the retroepiglottic air space, 16 to 18 cm from the nares, after light lidocaine spray anesthesia of the upper airway.[13] constraining force was recorded from this catheter with a differential transducer (Validyne, mould MP45 [plus or minus] 100 cm [Hsub2] O) Hypopharyngeal crushing was referenced to facemask squeezing A nasal mask, to which a pneumotachograph (No. 2 Fleish) and three-way valve were attached, was used to measure inspiratory result The mouth was taped to render certain all ventilation was nasal.

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