Assessment of Time-Volume and Flow-Volume Components of Forced Vital Capacity

Sackner, Marvin A.; Rao, Aswath; Birch, Stephen; Atkins, Neal; Gibbs, Lawrence M.; Davis, Brian L.

doi:10.1378/chest.82.3.272

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…However, in normal subjects breathing through external resistors, evidence of increased inspiratory loading is provided by the presence of asynchronous and paradoxical ribcage/abdominal motion [5]. Furthermore, the derivative of the tidal volume waveform of a respiratory inductive plethys- mograph provides information similar to the derivative of a spirometer or to that of a pneumotachograph [4]. This was confirmed by our experiments in normal subjects during continuous negative pressure breathing, when the derivative of the RIP tidal volume waveforms demonstrated characteristic changes equivalent to the curves of the flow meter connected to the airway during inspiratory flow limitation, i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Ribcage/abdominal volume changes recorded with calibrated RIP not only reflect airflow at the oral and nasal orifices [4], but also indicate inspiratory loading and effort by the degree of their asynchronous and paradoxical motion [5]. Therefore, during markedly increased upper airway resistance, such as in sleep disruptive snoring, we expected to see pronounced alterations in timing, amplitude and synchronization of ribcage/abdominal volume curves as well as inspiratory flattening of their time derivatives, which reflect airflow.…”

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confidence: 99%

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Breathing pattern during sleep disruptive snoring

Bloch

Li²,

Sackner³

et al. 1997

Eur Respir J

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Breathing disturbances during snoring have been quantified by face mask pneumotachography and oesophageal catheters. In order to nonobtrusively investigate respiratory mechanics during nonapnoeic snoring in relation to sleep disturbances, we employed calibrated respiratory inductive plethysmography (RIP). In 10 snorers, RIP recordings were studied during nonapnoeic snoring without arousals in non-rapid eye movement (NREM) sleep, nonapnoeic snoring with repetitive arousals in NREM sleep and wakefulness. Results were compared to RIP recordings in undisturbed NREM sleep and wakefulness in seven healthy nonsnorers. Compared to wakefulness and undisturbed NREM sleep in nonsnorers, snoring was associated with predominant thoracic breathing, ribcage/abdominal asynchrony, and increased fractional inspiratory time. Preceding arousals during snoring, inspiratory flattening of time-derivatives of RIP volume signals, and marked ribcage/abdominal asynchrony indicated pronounced flow limitation. Low variation coefficients of respiratory cycle time (<10%) and tidal volume (<20%) discriminated snoring periods without arousals from snoring periods with arousals and from wakefulness periods, with a sensitivity of 100% and a specificity of 99%. Snoring periods with arousals were identified by the presence of snoring combined with high coefficients of variation of cycle time (> or =10%) and tidal volume (> or =20%), with a sensitivity of 96% and a specificity of 100%. Thus, characteristic patterns of ribcage/abdominal motion recorded by respiratory inductive plethysmography differentiated breathing in sleep disruptive snoring from simple snoring.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Breathing pattern during sleep disruptive snoring

Bloch

Li²,

Sackner³

et al. 1997

Eur Respir J

View full text Add to dashboard Cite

show abstract

“…As RIP is supposed to give a plethysmographic waveform, 12 we undertook the present work to assess the accuracy of RIP waveform by comparing it with the volume waveform obtained from the whole BP. We also carried out the same comparison with the PNT as this device is commonly used for breathing pattern analysis .…”

mentioning

confidence: 99%