Queckenstedt's test affects more than jugular venous congestion in rat.

Jugular venous compression by the Queckenstedt's test (Q-test) increases the intracranial pressure, but the effects of isolated jugular venous congestion are not well known. Intraventricular pressure (IVP) was compared during direct obstruction of the common jugular veins (bilateral CJV clipping) and during external compression of bilateral CJV flows (Q-test) in a rat model. Intracerebroventricular catheters were inserted into the right lateral ventricle of nine male Sprague-Dawley rats (371.1±44.8 g, 82.2±12.0 days old). The initial mean IVP, arterial pressure (MAP), and pulse rate were 2.8±1.3 mmHg, 88.8±12.7 mmHg, and 348.3±69.1 beats/min, respectively. The mean IVP increment and MAP decrement were 6.5±2.5 and 13.5±5.7 mmHg, respectively, during the Q-test, compared to 2.3±1.5 and 7.3±3.8 mmHg, respectively, during bilateral CJV clipping (all p = 0.008). The IVP increment and MAP decrement were greater during the Q-test than during bilateral CJV clipping (p = 0.008 and p = 0.038). Although the Q-test and bilateral CJV clipping showed similar effects, the response with the Q-test was greater. Thus, the Q-test appears to obstruct other collateral cerebral veins in addition to bilateral CJV flows. Since this model revealed significant differences between the manual Q-test and bilateral CJV clipping, the finding should be taken into account in future studies on the Q-test in SD rats

Changes in intraventricular pressure, mean arterial pressure, and pulse rate due to Queckenstedt's test.

<p>(n = 9).</p><p><30 sec After Q-test: less than 30 seconds after Q-test.</p><p>>30 sec After Q-test: more than 30 seconds after Q-test.</p><p><i>Abbreviations</i>: IVP, intraventricular pressure; MAP, mean arterial pressure; PR, pulse rate; Q-test, Queckenstedt's test. For <i>p</i>-values, comparison is to the initial time point (before Q-test).</p

Comparison of changes in the intraventricular pressure, mean arterial pressure, and pulse rate between Queckenstedt's test and bilateral common jugular venous clipping.

<p>(n = 9).</p><p><i>Abbreviations</i>: IVP, intraventricular pressure; MAP, mean arterial pressure; PR, pulse rate; Q-test, Queckenstedt's test; CJV, common jugular vein. For <i>p</i>-values, comparison is to the difference between the Q-test and bilateral CJV clipping.</p

Changes in the intraventricular pressure (IVP) and mean arterial pressure (MAP) of SD rats due to bilateral common jugular venous (Bil. CJV) clipping.

<p>Changes in the intraventricular pressure (IVP) and mean arterial pressure (MAP) of SD rats due to bilateral common jugular venous (Bil. CJV) clipping.</p

Changes in the intraventricular pressure (IVP) and mean arterial pressure (MAP) of SD rats due to Queckenstedt's test (Q-test).

<p>Changes in the intraventricular pressure (IVP) and mean arterial pressure (MAP) of SD rats due to Queckenstedt's test (Q-test).</p