Upper Airways in Pregnancy: Evaluation by the Acoustic Reflection Method

2014-07-24 14:06:53 | BioPortfolio


It is well known that airway management can be difficult during pregnancy. Increased risks for difficult intubation in pregnant women have been often reported. Thus, pregnancy is regarded as a period of high anesthesiologic risk.

Generalized weight gain is a well known factor influencing the upper airway in pregnant women. However, the modifications of the airway itself are less well documented.

The acoustic reflection method is based on the analysis of the reflection of a single transient planar wave allowing the analysis of the longitudinal cross-sectional area profile of the examined cavity. It is a noninvasive and harmless method.

The aim of the study is to evaluate by acoustic reflection method the physiological modifications of the upper airways during pregnancy.

Women enrolled in the study will undergo an acoustic recording during the first, second, and third trimester of pregnancy, as well as two days and one month after delivery. Forty pregnant women will be included in this monocentric, prospective, open labelled study.

Moreover, a single acoustic recording will be performed in 10 other pregnant women undergoing an MRI for obstetrical purpose. The estimated caliber of the upper airways by MRI and acoustic method will be compared.

Study Design

Observational Model: Cohort, Time Perspective: Prospective




Acoustic reflection method


Armand Trousseau University Hospital




Club d'Anesthésie-Réanimation Pédiatrique Armand Trousseau

Results (where available)

View Results


Published on BioPortfolio: 2014-07-24T14:06:53-0400

Clinical Trials [1076 Associated Clinical Trials listed on BioPortfolio]

Acoustic Reflection Method and Work of Breathing

Upper airway obstruction (UAO) is very common in children. Presently, the importance of the UAO is evaluated by the physician during an endoscopic evaluation under general anaesthesia. Th...

Bracing During Infantile Scoliosis: Airways Study

Idiopathic juvenile thoracic scoliosis is a tridimensional deformation of the spine which may impact on the intrathoracic organs. Bracing is one of the oldest treatments of spinal deformit...

Reflection and Feedback in Clinical Reasoning

Medical students' abilities to diagnose skin lesions after dermatology electives often remain unsatisfactory despite a dermatology elective being one of the most effective ways to improve ...

Safety and Effectiveness Study of the Reflection Ceramic Acetabular System

This Post-Approval study is prospective follow-up study designed to evaluate the long-term safety and effectiveness of the Reflection Ceramic Acetabular System.

Evaluation of Respiratory Acoustic Monitor in Children After Surgery

The study will evaluate the performance of measuring respiration rate with the Respiratory Acoustic Monitoring (RAM).

PubMed Articles [10464 Associated PubMed Articles listed on BioPortfolio]

A novel method of reducing the acoustic emission wave reflected by boundary based on acoustic black hole.

Due to the difference between the characteristic impedance of air and plate structure, the acoustic emission (AE) wave propagating in a plate structure is reflected when reaching the boundary. It lead...

Goos-Hänchen effect for Brillouin light scattering by acoustic phonons.

The lateral shift of an optical beam undergoing Brillouin light scattering on an acoustic wave (AW) in the total internal reflection geometry is studied theoretically. It is shown that the lateral shi...

Antireflection self-reference method based on ultrathin metallic nanofilms for improving terahertz reflection spectroscopy.

We present the potential of an antireflection self-reference method based on ultra-thin tantalum nitride (TaN) nanofilms for improving terahertz (THz) reflection spectroscopy. The antireflection self-...

A Volumetric Analysis of the Vocal Tract Associated with Laryngectomees Using Acoustic Reflection Technology.

Previous studies of the laryngectomized vocal tract using formant frequencies reported contradictory findings. Imagining studies of the vocal tract in alaryngeal speakers are limited due to the possib...

Compressive acoustic holography with block-sparse regularization.

Sparse reconstruction methods, such as Compressive Sensing, are powerful methods in acoustic array processing, as they make wideband reconstruction possible. However, when addressing sound fields that...

Medical and Biotech [MESH] Definitions

Proteins produced by organs of the mother or the PLACENTA during PREGNANCY. These proteins may be pregnancy-specific (present only during pregnancy) or pregnancy-associated (present during pregnancy or under other conditions such as hormone therapy or certain malignancies.)

The state of PREGNANCY in women with DIABETES MELLITUS. This does not include either symptomatic diabetes or GLUCOSE INTOLERANCE induced by pregnancy (DIABETES, GESTATIONAL) which resolves at the end of pregnancy.

A scientific tool based on ULTRASONOGRAPHY and used not only for the observation of microstructure in metalwork but also in living tissue. In biomedical application, the acoustic propagation speed in normal and abnormal tissues can be quantified to distinguish their tissue elasticity and other properties.

Unintended accidental pregnancy, including pregnancy resulting from failed contraceptive measures.

Pregnancy in which the mother and/or FETUS are at greater than normal risk of MORBIDITY or MORTALITY. Causes include inadequate PRENATAL CARE, previous obstetrical history (ABORTION, SPONTANEOUS), pre-existing maternal disease, pregnancy-induced disease (GESTATIONAL HYPERTENSION), and MULTIPLE PREGNANCY, as well as advanced maternal age above 35.

More From BioPortfolio on "Upper Airways in Pregnancy: Evaluation by the Acoustic Reflection Method"

Quick Search


Relevant Topics

Obstetrics and gynaecology
Fertility Menopause Obstetrics & Gynaecology Osteoporosis Women's Health Obstetrics and gynaecology comprises the care of the pregnant woman, her unborn child and the management of diseases specific to women. Most consultant...

Women's Health
Women's Health - key topics include breast cancer, pregnancy, menopause, stroke Follow and track Women's Health News on BioPortfolio: Women's Health News RSS Women'...

Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...

Searches Linking to this Trial