in order to determine the effect of valsalva maneuver and head rotation on the internal jugular vein (ijv) diameter and cross-sectional area and overlap with the carotid artery (ca) and find the best technique for safe cannulation of the ijv and decrease the risk of ca puncture, the diameter of both the ijv and the ca and percentage of overlap between the two vessels and cross-sectional area of...

Abstract The powered-descent landing (PDL) phase of the Tianwen-1 mission began with composite backshell—parachute (CBP) separation and ended landing-rover touchdown. main tasks this were to reduce velocity lander, perform avoidance maneuver, guarantee a soft PDL overcame many challenges: performing divert maneuver avoid collision CBP while simultaneously avoiding large-scale hazards; slowing d...

Definitions Equipment Recommenhations Recommendation: Vital Capacity (VC) Recommendation: Forced Vital Capacity (FVC) Recommendation: Timed Forced Expiratory Volume (FEV[) Recommendation: PEF Recommendation (Monitoring): PEF Recommendation: FEFzs-75% Recommendation: Flow (9) Recommendation: Forced Expiratory Time (FET%) Recommendation: Forced Inspiratory Vital Capacity M a n e u v e r s Recomme...

conclusions continuous portal triade clamping (the pringle maneuver) during liver ischemia (30 and 45 minutes) in rabbits resulted in no ischemic change. increasing time of clamping to 30 minutes was safe in intermittent pringle maneuver. materials and methods in an experimental study, 20 new-zealand white rabbits were selected. in laparotomy, a blunt dissector was passed through the foramen of...

The zero propellant maneuver (ZPM) is an advanced space station, large angle attitude maneuver technique, using only control momentum gyroscopes (CMGs). Path planning is the key to success, and this paper studies the associated multi-objective optimization problem. Three types of maneuver optimal control problem are formulated: (i) momentum-optimal, (ii) time-optimal, and (iii) energy-optimal. ...

Occasionally, lifting of a heavy weight leads to dizziness and even to fainting, suggesting that, especially in the standing position, expiratory straining compromises cerebral perfusion. In 10 subjects, the middle cerebral artery mean blood velocity (V(mean)) was evaluated during a Valsalva maneuver (mouth pressure 40 mmHg for 15 s) both in the supine and in the standing position. During stand...

BACKGROUND The triple airway maneuver insertion technique allowed faster insertion of the LMA. This study compared three different insertion techniques of the laryngeal mask airway-Unique™. METHODS One hundred and eighty ASA I-II patients aged 18-65 years were included into the study. Patients were randomly allocated to the standard, rotational and triple airway maneuver (triple) group. In th...

Introduction: The capacity to vary the heart rate represents important physiologic role in the daily life. The variations of the RR intervals is dependent of biological modulators as the autonomic nervous system. Those variations constitute the heart rate variability (HRV). Methods: 10 athletes (Atl) and 10 sedentary (Sed) male individuals (20-35 age) were submitted to digital electrocardiograp...