Blood pressure measurement. Mercury pressure gauge used in an instrument used to measure blood pressure,or sphygmomanometer,showing a high blood pressure reading. The sphygmomanometer works by inflating a cuff wrapped around the arm until blood flow is stopped in a main artery. By slowly deflating the cuff and listening for the return of blood flow,the blood pressure during a heartbeat (systolic pressure) is recorded. Further cuff deflation gives the blood pressure between heartbeats (diastolic pressure). Blood pressure is then expressed as a difference between these two measurements,in millimetres of mercury (mm Hg) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Terry, Sheila |
Taille de l’image : | 2572 px × 3165 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |