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Results for “PLETHYSMOGRAPHY”

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PubMed1988

Estimates of ventilation from inductance plethysmography in sleeping asthmatic patients.

To assess the accuracy of the respiratory inductance plethysmograph (RIP) for monitoring ventilation during sleep-associated bronchoconstriction, five adult patients with nocturnal worsening of their asthma were monitored overnight in the sleep laboratory. Three of the five patients demonstrated episodic paradoxic respiratory motion of the lower rib cage undetected by the RIP. Such paradoxic motion was consistently associated with overestimation of volumetric data by RIP compared to pneumotachygraphic measurements. With onset of lower rib cage paradox, the mean error of RIP-derived VT measurements increased from 9.1 +/- 1.7 to 27.9 +/- 3.8 percent (p less than .001). Flow measurements derived from RIP were also inaccurate in the presence of lower rib cage paradox, with the mean error of the measurement increasing from 9.0 +/- 2.5 to 33.5 +/- 5.3 percent (p less than .001). We conclude that RIP is an unreliable technique for quantitatively monitoring ventilation in sleeping asthmatic patients.

Abdomen↗
PubMed1981

Non-invasive evaluation by thermistor plethysmography of left ventricular performance during dynamic exercise. Comparison with echocardiography.

The purpose of this study was to evaluate the reliability of two non-invasive techniques (STI and echocardiography) in assessing cardiovascular response during exercise. STI were obtained using a new carotid pulse transducer (thermistor pulse) proved to be reliable in exercise recording. The study population included 12 male rowers (age 15-20 years), who performed supine bicycle exercise; STI and echocardiographic recording of left ventricle were simultaneously obtained at rest and continuously throughout the exercise period. A negative linear correlation (r=-0.782; p less than 0.001) was found between PEP (pre-ejection period) and %LVID (fractional shortening of left ventricle), reliable indexes of cardiac contractility measured by the two techniques. A lower, but significant correlation (r=0.643; p less than 0.001) was present between ETI (left ventricular ejection time corrected by heart rate) and SV (stroke volume) indexes of pump function. The present study shows that STI measured with this new technique, can be employed in evaluating left ventricular function in those patients in whom a good echocardiogram is difficult to record during exercise.

Adolescent↗
PubMedDate not supplied

Plethysmography.

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Electrodes↗
PubMed2004

Evaluation of head-out constant volume body plethysmography for measurement of specific airway resistance in conscious, sedated sheep.

OBJECTIVE: To evaluate the use of a modified whole body plethysmograph in awake sheep. ANIMALS: 10 healthy adult sheep. PROCEDURE: Concurrent measurements of specific airway resistance (sR(aw)) and pulmonary resistance (R(L)) were obtained using a novel noninvasive head-out constant-volume plethysmograph and esophageal balloon-pneumotachography, respectively. All data were collected before and after external resistive loading with 1 and 5.6 cm H2O/L/s. Functional residual capacity (FRC) was measured by helium dilution for computation of airway resistance (R(aw)) preloading (R(aw) = sR(aw)/FRC). RESULTS: The sR(aw) and R(L) were closely correlated in 10 adult sheep. Additionally, sR(aw), and R(L) accurately reflected the magnitude of added resistance. The mean FRC was 52 mL/kg and used to calculate R(aw). At baseline, the values for R(aw) were significantly correlated with sR(aw) and R(L). CONCLUSIONS AND CLINICAL RELEVANCE: Precise measurements of sR(aw) and R(aw) at baseline and sR(aw) after external resistive loading were obtained by use of this novel noninvasive plethysmographic technology. This method should have application to veterinary patients or animals used in research in which noninvasive rapid or serial measurements of sR(aw) in the conscious state are required.

Airway Resistance↗