In this VetGirl v-blog, we demonstrate how to measure a blood pressure in a cat using the doppler. The doppler technique uses a crystal to detect flow instead of a stethoscope. Using this technique, ultrasound gel is placed on the crystal surface. The gel and crystal are then placed distal to the cuff over the artery. The crystal converts the pulsatile flow signal to an audible sound delivered via the doppler speaker. A pressure cuff is used to occlude the artery, with the assistance of a sphygmomanometer. The pressure cuff is inflated to a pressure greater than that of the blood pressure, at which time the audible sound of the pulsitile flow is lost. The pressure in the cuff is then slowly released. The pressure at which the audiblble flow signal returns is considered the systolic blood pressure.
A doppler blood pressure is obtained with the use of a crystal, placed over the artery distal to the cuff. The reading at which the pulse is again audible is considered the systolic blood pressure. In cats, values obtained may be closer to the mean arterial pressure (MAP) based on more recent literature.
VetGirl's favorite? The Parks Doppler machine. We believe it's a must have for any veterinary clinic!