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T Petitjean

Publications and source records attributed to T Petitjean.

9 recordsLinked to original sources
PubMed2004

Correlated strength in the nuclear spectral function.

We have carried out an (e,e'p) experiment at high momentum transfer and in parallel kinematics to measure the strength of the nuclear spectral function S(k,E) at high nucleon momenta k and large removal energies E. This strength is related to the presence of short-range and tensor correlations, and was known hitherto only indirectly and with considerable uncertainty from the lack of strength in the independent-particle region. This experiment locates by direct measurement the correlated strength predicted by theory.

Journal Article↗
PubMed2004

[Tracheotomy management in home mechanical ventilation].

INTRODUCTION: Despite a large increase in the use of long term non-invasive ventilation domiciliary ventilation via a tracheostomy remains necessary in certain cases of severe respiratory insufficiency. The object of this article is to describe the technical and human management required in domiciliary ventilation by tracheostomy. PERSPECTIVES: From the setting up of invasive ventilation in the home the choice of a tracheostomy tube to suit the patient and the management of the cuff by the patient or the family requires special attention by the prescribing physician. Currently humidification of the circuit is usually achieved by means of a hot water humidifier. Aspiration techniques, the changing and cleaning of the tracheostomy tube and the correct use of the speaking system need to be taught to the patient and the relatives. The main complications of domiciliary ventilation by tracheostomy are linked to the presence of the tube in the trachea and either mechanical (stenosis, granulomata, tracheal-oesophageal fistula) or infections. CONCLUSIONS: The prescribing physician should call on health care providers whose staff are trained in domiciliary ventilation by tracheostomy and include in his team nurses who can continue the education of the patient and relatives.

Adult↗
PubMed2002

[Treatment of obstructive sleep apnea syndrome with mandibular advancement appliances].

Mandibular advancement device provide a therapeutic option for obstructive sleep apnea syndrome (OSAS). Clinical improvement has been proven in the different available studies, mainly on nocturnal respiratory events and quality of sleep. Less snoring have been noted by bed partners and objective studies have demonstrated a decrease in snoring frequency and intensity. The effects of these appliances on upper airways resistance syndrome is not yet well documented. The significant clinical improvement is secondary to the decrease in the occurrence of apneas and hypopneas. Polysomnographic improvement criteria with an apnea hypopnea index less than 10 per hour has been noted in certain cases, although no improvement or even worsening was noted in other cases. Sleep architecture has also changed in these patients, with a decrease in the time spent in stages 1 and 2, and an increase in the time spent in stages 3, 4 and rapid eye movement sleep. Micro-arousals are also reduced in number. Somnolence and loss of attention are improved; these have been evaluated subjectively or by a well known and approved somnolence scale. In some cases a test for vigilance was done. Our results are identical to those published in the different studies concerning respiratory events and sleep architecture.

Airway Resistance↗
PubMed2001

Measurement of the electric form factor of the neutron through d-->(e-->,e(')n)p at Q2 = 0.5 (GeV/c)(2).

We report the first measurement using a solid polarized target of the neutron electric form factor G(n)(E) via d-->(e-->,e(')n)p. G(n)(E) was determined from the beam-target asymmetry in the scattering of longitudinally polarized electrons from polarized deuterated ammonia ( 15ND3). The measurement was performed in Hall C at Thomas Jefferson National Accelerator Facility in quasifree kinematics with the target polarization perpendicular to the momentum transfer. The electrons were detected in a magnetic spectrometer in coincidence with neutrons in a large solid angle segmented detector. We find G(n)(E) = 0.04632+/-0.00616(stat)+/-0.00341(syst) at Q2 = 0.495 (GeV/c)(2).

Journal Article↗
PubMed2000

Principles of mandibular advancement device applied to the therapeutic of snoring and sleep apnea syndrome.

Mandibular advancement device (MAD) represents a therapeutic option for simple snoring to obstructive sleep apnea syndrome (OSAS). The different available studies report an improvement either on nocturnal respiratory events or on the quality of sleep. The decrease in the intensity of snoring is confirmed by the patient's partner and by objective studies. For the time being the effects of these mandibular advancement devices on the upper airway resistance syndrome has not yet been well documented. The significant clinical improvement is secondary to the decrease in apnea hypopnea index (AHI). A polysomnographically proved cure has been reported with AHI < 10/h. Sleep architecture is also improved with wearing MAD demonstrating a decrease in the time passed in stage 1 sleep and an increase in slow wave sleep and rapid eye movement sleep (REM). A decrease in microarousals index has been shown. Daytime vigilance disorders are subjectively and objectively less remarkable. Then MAD can be beneficial for mild to moderate SAOS.

Humans↗
PubMed2000

Nocturnal hypoventilation in chronic respiratory failure (CRF) due to neuromuscular disease.

Decrease of respiratory muscle capacities in neuromuscular disease can lead to chronic respiratory failure with permanent alveolar hypoventilation. Respiratory centers elaborate a strategy of breathing dedicated to prevent overt respiratory muscles fatigue. This strategy may worsen chronic hypercapnia. During sleep, ventilation decreases because a lessening in respiratory centers function. During NREM sleep hypoventilation is only an exacerbation of what is seen during wakefulness. During REM sleep, atonia worsens much more hypoventilation particularly when diaphragmatic function is impaired. The effects of atonia are amplified by a very low reactivity of respiratory centers. Nocturnal mechanical ventilation improves nocturnal hypoventilation and daytime arterial blood gases (ABG). Mechanism of improvement in ABG and how nocturnal hypoventilation and diurnal hypoventilation interact, are still a matter of debate.

Arousal↗
PubMed2000

[Mandibular advancement orthoses used in the treatment of obstructive sleep apnea syndrome].

Mandibular advancement devices represent a therapeutic option for obstructive sleep apnea syndrome (OSAS). Clinical improvement has been proven in the different available studies, mainly on nocturnal respiratory events and quality of sleep. Less snoring have been noted by bed partners and objective studies have demonstrated decrease in snoring frequency and intensity. The effect of these ortheses on upper airways resistance syndrome is not yet well documented. The significant clinical improvement is secondary to the decrease in the occurrence of apneas and hypopneas. Polysomnographic improvement criteria with an apnea hypopnea index less than 10 per hour has been noted in certain cases. Although no improvement or even worsening was noted in other cases. Sleep architecture has also changed in these patients, with a decrease in the time spent in stages 1 and 2, and an increase in the time spent in stages 3 and 4 and rapid eye movement sleep. Micro-arousals are also decreased in number certainly with the decrease in the occurrence of respiratory events. Somnolence and loss of attention are improved; these have been evaluated subjectively or by a well known and approved somnolence scale. In some cases a test for vigilance was done.

Airway Resistance↗
PubMed1999

[Mandibular advancement orthotic for treatment of obstructive sleep apnea].

Mandibular advancement devices represent a therapeutic option for obstructive sleep apnea syndrome (OSAS). Clinical improvement has been proved in the different available studies, mainly on nocturnal respiratory events and quality of sleep. Less snoring have been noted by bed partners and objective studies have demonstrated decrease in snoring frequency and intensity. The effect of these ortheses on upper airways resistance syndrome is not yet well documented. The significant clinical improvement is secondary to the decrease in the occurrence of apneas and hypopneas. Polysomnographic improvement criteria with an apnea hypopnea index less than 10 per hour has been noted in certain cases. Although no improvement or even worsening was noted in other cases. Sleep architecture has also changed in these patients, with a decrease in the time spent in stages 1 and 2, and an increase in the time spent in stages 3 and 4 and rapid eye movement sleep. Microarousals are also decreased in number certainly with the decrease in the occurrence of respiratory events. Somnolence and loss of attention are improved; these have been evaluated subjectively or by a well known and approved somnolence scale. In some cases a test for vigilance was done.

Humans↗