Monitoring system for cardiac surgical operations with cardiopulmonary bypass

Abstract

A monitoring system for cardiac operations with cardiopulmonary bypass comprising: a processor operatively connected to a heart-lung machine; a pump flow detecting device connected to a pump of the heart-lung machine to continuously measure the pump flow value and send it to the processor; a hematocrit reading device inserted inside the arterial or venous line of the heart-lung machine to continuously measure the blood hematocrit value and to send it to the processor; a data input device to allow the operator to manually input data regarding the arterial oxygen saturation and the arterial oxygen tension; computing means integrated in the processor to compute the oxygen delivery value on the basis of the measured pump flow, the measured hematocrit value, the preset value of arterial oxygen saturation, and the preset value of arterial oxygen tension; and a display connected to the processor to display in real-time the computed oxygen delivery value.

I claim: 
     
         1 . A monitoring system for cardiac operations with cardiopulmonary bypass utilizing a heart lung machine and an oxygenator fluidly coupled to the heart lung machine, the monitoring system comprising:
 means to obtain an arterial oxygen saturation value;   means to obtain a venous oxygen saturation value;   means to obtain a hematocrit value;   a pump flow reading device configured to obtain a pump flow rate from a pump of the heart lung machine;   a processor operably connected to the means to obtain an arterial oxygen saturation value, the means to obtain a venous oxygen saturation value and the means to obtain a hematocrit value, the processor configured to calculate an oxygen delivery value and an oxygen consumption value; and   a display operably connected to the processor, the display configured to display each of the arterial oxygen saturation value, the venous oxygen saturation value, the hematocrit value, the oxygen delivery value, the oxygen consumption value and the pump flow rate.   
     
     
         2 . The monitoring system of  claim 1 , wherein the processor is further configured to calculate an indexed oxygen delivery value and display the calculated indexed oxygen delivery value on the display. 
     
     
         3 . The monitoring system of  claim 1 , wherein the processor is further configured to calculate an indexed oxygen consumption value and display the calculated indexed oxygen consumption value. 
     
     
         4 . The monitoring system of  claim 1 , wherein the processor is further configured to calculate an oxygen extraction ratio and display the calculated oxygen extraction ratio on the display. 
     
     
         5 . The monitoring system of  claim 1 , wherein the processor is further configured to calculate a cardiac index value and display the calculated cardiac index value on the display. 
     
     
         6 . The monitoring system of  claim 1 , wherein the processor is configured to obtain a hemoglobin value and display the hemoglobin value on the display. 
     
     
         7 . The monitoring system of  claim 1 , wherein the processor is configured to calculate a body surface area value and to display the calculated body surface area value on the display. 
     
     
         8 . A method of monitoring a patient during a cardiac operation with cardiopulmonary bypass and a heart lung machine operably connected to an oxygenator configured for oxygenating blood, the method comprising:
 obtaining an arterial oxygen saturation value;   obtaining a venous oxygen saturation value;   obtaining a hematocrit value;   calculating an oxygen delivery value;   calculating an oxygen consumption value; and   displaying each of the arterial oxygen saturation value, the venous oxygen saturation value, the hematocrit value, the oxygen delivery value and the oxygen consumption value.   
     
     
         9 . The method of  claim 8 , further comprising:
 calculating an indexed oxygen delivery value; and   displaying the calculated indexed oxygen delivery value.   
     
     
         10 . The method of  claim 8 , further comprising:
 calculating an indexed oxygen consumption value; and   displaying the calculated indexed oxygen consumption value.   
     
     
         11 . The method of  claim 8 , further comprising:
 calculating an oxygen extraction ratio; and   displaying the calculated oxygen extraction ratio.   
     
     
         12 . The method of  claim 8 , further comprising:
 calculating a cardiac index value; and   displaying the calculated cardiac index value.   
     
     
         13 . The method of  claim 8 , further comprising:
 obtaining a pump flow rate; and   displaying the obtained pump flow rate.   
     
     
         14 . The method of  claim 8 , further comprising:
 obtaining a hemoglobin value; and   displaying the hemoglobin value.   
     
     
         15 . The method of  claim 8 , further comprising:
 calculating a body surface area value; and   displaying the calculated body surface area value.