Question

a)what kind of rythm should a patient on SVV monitoring should have?
b) be in a ventilator with _____ tidal volumes

Answer 1

a)what kind of rythm should a patient on SVV monitoring should have?pulses paradoxus

Stroke volume variation (SVV) means that the change in the amount of blood ejected from the left ventricle into the aorta with each heartbeat.

This is reflected by arterial blood pressure changes in relation to the pattern of respiration.  

In a spontaneous breathing patient,the abnormaly decreased stroke volume ,systolic blood pressure slightly and pulse decreases upon inspiration. This is known as pulses paradoxus.

This can be an irregular rythm noticed under SVV.

b) be in a ventilator with _>8mls/kg____ tidal volumes

A patient may have a SVV of 70%, but this will be down to the irregularity of spontaneous breathing.

When mechanically ventilated, low tidal volumes are not sufficient to change intrathoracic pressure. Tidal volumes of >8mls/kg, with no spontaneous breaths would be required to utilise SVV. If a patient is arrhythmic, SVV is more related to the irregularity in diastole than ventilation.