Variation in Maximum Inspiratory and Expiratory Pressure: RESULTS

26 Apr
2011

It can be seen in Table 1 that there is evidence that the patients suffered a moderate obstruction of air flow and the volumes are increased. Three of the patients had a Deo of less than 80 percent due to clinical and radiologic signs of pulmonary emphy­sema. The average TLIM of the sample was 3.7 ±1.96 minutes. The anthropometric measure­ments were normal.

Table 1—Functional and Nutritional Values of the Sample Studied

 

Factor

Value, Mean ± SD

% Predicted

FEV,, L

1.46 ±0.78

46 ±18.3

FVC, L

2.59 ±0.74

67 ±12.6

FEV./FVC

48.8± 14.2

TLC, L

6.8±2.1

117.4± 18.7

RV, L

3.8± 1.0

180.3 ±44.7

RV/TLC

55.4±6.3

FRC, L

4.6± 1.4

152.1 ±43.6

Po2, mm Hg

72.4 ±0.02

Pco2, mm Hg

35.7±6.8

pH

7.41 ±0.02

Sat Hb, %

94.4± 1.6

Deo, %

74.4 ±45.4

KCO, %

73.8 ±29.6

TLIM, minutes

3.7± 1.9

Weight, kg

65 ±9.7

105.1 ±10.9

TSF, mm2

11.2±4.0

Circum, cm

28.3 ±3.4

Table 2 shows the MIP and the МЕР of the patients at the basal stage, on exhaustion, and at 10, 20, and 30 minutes following exhaustion. There was a global significant difference between the five groups (Fried­man test: p<0.018; x2= 11.82). The decrease in MIP becomes significant (79.1 cm H20) ten minutes after exhaustion with respect to its basal value (85.7 cm H20). The МЕР did not significantly vary with respect to its basal value either at the end of the test or 10, 20, and 30 minutes after exhaustion (p<0.54; x2 = 3.05).
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Table 2—Basal Maximal Inspiratory Pressure (MIP) and Maximal Expiratory Pressure (МЕР) at Exhaustion and after 10, 20, and 30 Minutes

Minutes

Basal

Exhaustion

10

20

30

MIP,

85.7± 18.1

82.6 ±18.1

79.1 ±17.2

78.6 ±16.3

79.6 ±19.1

cm HaO

(ns)

p<0.03

p<0.03

p<0.03

МЕР,

139 ±43.9

141.3±51.9

139.2 ±47.9

142.8 ±45.3

145.3 ±48.7

cm HaO

(ns)

(ns)

(ns)

(ns)

*ns = not significant with respect to the
basal determination. The significance was for p<0.05 (Wilcoxon test
of sign range).

The coefficient of variation for the same patient for MIP was 6.75 and for МЕР it was 6.61.

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