4 Colour Doppler US confirms the venous flow and augmentation of venous flow with Valsalva manoeuvre
Therefore, performing a preoperative venogram during the Valsalva manoeuvre
becomes it is imperative to reveal unknown anastomosis before there is more vascular damage.
Our study revealed that there were significant differences in the 30:15 ratio, E:I ratio and Valsalva Ratio between controls (Group I) and Obstructive Sleep Apnea patients (Group II), with the values of OSA patients in Group II being lower; these ratios being obtained from the heart rate response to standing, heart rate response to deep breathing and Valsalva manoeuvre
6) Valsalva manoeuvres
have been implicated as the cause of SPM.
In children, it is possible to increase the CSA of IJV without the Valsalva manoeuvre
or other enhancement manoeuvres such as liver compression.
BREAST or bottle-feed a very young child during the descent because this has the same effect as the Valsalva manoeuvre
, where air at cabin pressure is forced into the middle ear and sinuses.
The Trendelenburg position, Valsalva manoeuvre
and abdominal compression have been suggested to increase the cross-sectional area (CSA) of the IJV and SCV (1-6).
This is called the Valsalva Manoeuvre
which reintroduces air into the middle ear and sinuses.
RESPIRATORY CHANGES: The diameter of large veins increases with deep inspiration or with the Valsalva manoeuvre
The periosteum is loosely attached to the orbital bones, especially the orbital roof, which is the most common site for NTSOH development (6) The orbital veins are valveless, allowing increased jugular venous pressure to be transmitted to the veins in the subperiosteal orbital space, possibly causing rupture (2) Therefore, factors that increase venous pressures, such as vomiting, coughing and the Valsalva manoeuvre
may play a major role in NTSOH (1).
This is called the Valsalva manoeuvre
and reintroduces air into the middle ear and sinuses.
It must be stressed, however, that a Valsalva manoeuvre
is ill-advised in the event of venous air embolism--because of the risk, on its release, of paradoxical embolism (1,4).