XI, B, 3 Concepcion and Bulatao: Blood Pressure of Filipinos 139 



crease in amplitude in the record of the pulse wave. Such a 

 variation may be very hard to differentiate from criterion a. 

 Sometimes movements of the subjects may be due to a distinct 

 shock, as pointed out by Erlanger.(6) The shock is explained 

 by him as follows: 



that as soon as the external pressure falls below the maximum intravas- 

 cular pressure the artery opens out for a moment with the advent of the 

 pulse wave, only to collapse with a perceptible shock almost immediately. 



In fact, V. Frey(9) used this shock as an index in his method 

 of estimating systolic blood pressure in man. To overcome this 

 difficulty, we usually repeat our observation. 



In the cases where none of the criteria is present, we do not 

 give any reading. 



RESULTS 



Table II shows the averages of our readings arranged in de- 

 cades, excepting the cases between 15 and 20 years of age. 



It will be seen that there is a general tendency for the systolic, 

 diastolic, and pulse pressures to ascend with age. This can 

 be more easily seen in the chart (fig. 1). It will further be 

 seen that with an average age in males of 29.5 years and in 

 females of 25.1 years our cases show average systolic pressures 

 of 115.5 and 116 millimeters of mercury, diastolic pressures of 

 79.1 and 83.4 millimeters, and pulse pressures of 36.4 and 32.6 

 millimeters, respectively. 



Table II. — Blood-pressure and pulse-rate readings on 536 male and 181 



female Filipinos. 



MALES. 



Age. 



Cases. 



Systolic Diastolic 

 pressure, pressure. 



Pulse 

 pressure. 



Pulse 

 rate. 



IB to 20 years- 

 21 to 30 years. 

 31 to 40 years. 

 41 to 50 years- 

 61 to 60 years. 

 61 to 90 years- 



114 

 258 

 74 

 45 

 24 

 21 



mm. Hg. 

 110.7 

 111.9 

 118.8 

 125.4 

 129.0 

 137.8 



mm. Hg. 



77.6 

 76.6 

 80.3 

 86.6 

 86.2 

 91.6 



mm. Hg. 

 33.1 

 35.3 

 38.5 

 38.8 

 42.8 

 46.2 



78.2 

 84.9 

 80.2 

 69.0 

 69.0 

 77.5 



Total and average 



536 



115.6 



79.1 



36.4 



81.5 



FEMALES. 



15 to 20 years 



66 

 85 

 18 

 12 



109.2 

 118.1 

 118.2 

 132.9 



80.8 

 84.1 

 85.2 

 90.6 



28.4 

 34.0 

 33.0 

 42.4 



86.3 



80.7 

 91.4 

 84.1 



21 to 30 years 



31 to 40 years 



41 to 60 years 



Total and average 



181 



116.0 



83.4 



32.6 



87.2 





