JESSE / SCIENCE PHOTO LIBRARY JESSE / SCIENCE PHOTO LIBRARY
Vital signs monitoring. Female anaesthetist watching a vital signs monitor during an operation. The coloured moving traces measure (from the top): heartbeat (electrocardiogram or ECG, blue), maximum blood pressure in millimetres of mercury or mmHg (red), minimum blood pressure in mmHg (pink) and respiration rate (yellow). These vital signs determine the health of the patient's heart and lungs. If any of these signs become abnormal an alarm will sound. The anaesthetist is wearing a surgical cap, face mask, gown and gloves to maintain a sterile environment.
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