Variations of the Pulse Rate and Arterial Blood Pressure under Increased Barometric Pressure and Their Prognostic Value in the Occurrence of Compressed Air Illness.
NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
Pagination or Media Count:
Pulse rate, arterial systolic, diastolic, and pulse pressure readings were taken on 24 divers making a total of 121 dives. The average pre-dive pulse rate of the divers completing 104 uneventful dives was less than that of the divers completing dives which subsequently caused eight cases of mild bends and nine cases of bends. During recompression all divers showed a consistent slowing of the pulse amounting to an average loss of about twelve beats per minute. Upon completion of the dives, the average pulse rate returned to the pre-dive value for all divers except for those who developed bends where the rate averaged 6.6 fewer beats per minute. The average pre-dive systolic blood pressure of divers completing uneventful dives was slightly lower than that of the divers completing dives which terminated with symptoms of mild bends or bends. During recompression all divers showed a consistent drop of pressure ranging from 1.0 to 9.6 mm. with no uniform pattern among the three groups. The divers completing normal runs showed a loss of 4.2 mm., those terminating with mild bends 1.0 mm. and those terminating with bends 9.6 mm. Rest and work dives showed no appreciable differences among the three groups of divers.
- Stress Physiology