Page 21 - Delaware Medical Journal - July 2016

SCIENTIFIC ARTICLE
La Farge Table
AGE
HEART RATE (beats per minute)
50 60 70 80 90 100 110
120 171 162 157 153 150 147 143
165
153
144
133
134
128
123
130 140
175 178
167 171
160 165
157 160
154 157
150 154 157 147 150
150
182
174
169
165
161 166
MALES
3 155
159 163 167 144 148 151 155 159
160 170 186 190 178 181 172 176 169 172
4
149
152
156
160
163
168
171
175
179
182
186
6 141
8
136
141
145
148
152
156
159
163
167
171
175
178
10 130 14 127 18 124 25 120 25 116
3
6
10 118 14 112 18 107 25 102 25 97
134 139 130 134 127 131 124 127 120 124
130 134 122 125 116 120 111 116 106 109 100 104
142 146 149 153 137 142 146 149 135 139 143 147 131 135 139 143 127 131 135 139
150 153 157 161 137 142 146 149 129 133 136 141 123 127 131 132 119 123 127 130 114 118 121 125 107 111 116 119
169 172
156 160
148 152
143 146
137 142
132 136 140 127 130
180 183 168 172 159 163 153 157
12
128
132
136
140
144
147
151
155
158
162
167
170
174
16
125
129
132
136
141
144
148
152
155
159
162
167
20
123
126
130
134
137
142
145
149
153
156
160
165
30
118
122
125
129
133
136
141
145
148
152
155
40
115
119
122
126
130
133
137
141
145
149
FEMALES
176
165
155
150
146 149
FIGURE 1
LaFarge Table showing estimated VO2 per HR for patients 3-40 years old.
Note: The LaFarge Table is not intended to be used for patients over 40 years of age.
Source: Cardiovascular Research 1970:4;27.
4
141
145
149
152
156
159
163
168
171
175
179
8
125
129
133
136
141
144
148
152
155
159
163
167
12
115
119
122
126
130
133
137
141
145
149
152
156
160
16
109
114
118
121
125
128
132
136
140
144
148
151
20
106
109
114
118
121
125
128
132
136
140
144
148
30
99
103
106
110
115
118
122
125
129
133
136
40
94
102
102
105
109
112
117
121
124
128
The Fick oxygen technique ideally involves a direct measurement of oxygen consumption (VO2). Historically VO2 was measured using a Douglas bag, which is cumbersome
for patients and staff. Therefore the Fick technique using
an estimation of VO is used instead in many cardiac
2
catheterization laboratories.4 VO values are typically estimated 2
from tables or published predictive equations. The published predictive equations are LaFarge and Miettinen 1970;9 Lindahl et al 1989;10 Lundell et al. 1996;11 and Wessel et al. 1969,12 with
the LaFarge equation being the most commonly used equation. (Figure 1) Reliability and use of predictive equations for CO measurement have been questioned in the catheter laboratory setting because of large discrepancies between measured and estimated values,13,14 subsequent hemodynamic and valve area calculations.15,16
We investigated which CO technique – estimated Fick or thermodilution – would be the determinative factor in
Del Med J | July 2016 | Vol. 88 | No. 7
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