area leg locations 134 may also be used on one leg or both legs where the electrodes are placed generally on the leg or more particularly the lower leg ankle or foot area fig8 a and 8b are block diagrams showing combinations of detector instrument 20 with other medical diagnostic and therapeutic equipment fig8 a shows detector instrument 20 generally contained in an enclosure 140 in which at least one of additional optional separate plug in or built in medical diagnostic or therapeutic modules 142 are housed as an integrated system examples of modules 142 include ecg pulse oximeter non invasive blood pressure thermometer capnography respiration non invasive cardiac output central venous pressure monitor plethysmography pneumography and cardiac defibrillator enclosure 140 may further include at least one of a power supply 144 a display device 146 for example an lcd panel an output device 148 for example a universal serial bus usb or serial or local area network connector or wireless transmitter memory 150 for retaining instructions and data sourced from modules 142 controls 152 and controller subsystem 154 for common operational access by one or more of modules 142 contained within enclosure 140 fig8 b shows detector instrument 20 contained in an enclosure 156 that also contains as a non integrated collection of independently operating diagnostic or therapeutic equipment modules examples of such equipment modules include a cardiac defibrillator 158 an ecg acquisition device 160 a pulse oximeter 162 a thermometer 164 a non invasive blood pressure instrument 166 a central venous pressure monitor 168 or a capnography instrument 170 as shown other examples of such equipment modules include a noninvasive cardiac output measurement instrument plethysmography instrument or pneumography instrument skilled persons will appreciate that these.