Merge pull request #1064 from scottleibrand/fix-delayedCarbs

Fix delayed carbs
nightscout · Sep 21, 2015 · ec74763 · ec74763
2 parents 0412d03 + 26ebe88
commit ec74763
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Showing 2 changed files with 8 additions and 3 deletions.
diff --git a/lib/plugins/cob.js b/lib/plugins/cob.js
@@ -30,7 +30,8 @@ function init() {
       return {};
     }
 
-    var liverSensRatio = 1;
+    // TODO: figure out the liverSensRatio that gives the most accurate purple line predictions
+    var liverSensRatio = 8;
     var totalCOB = 0;
     var lastCarbs = null;
 
@@ -51,10 +52,12 @@ function init() {
         var cCalc = cob.cobCalc(treatment, profile, lastDecayedBy, time);
         var decaysin_hr = (cCalc.decayedBy - time) / 1000 / 60 / 60;
         if (decaysin_hr > -10) {
+          // units: BG
           var actStart = iob.calcTotal(treatments, profile, lastDecayedBy).activity;
           var actEnd = iob.calcTotal(treatments, profile, cCalc.decayedBy).activity;
           var avgActivity = (actStart + actEnd) / 2;
-          var delayedCarbs = avgActivity * liverSensRatio * profile.getSensitivity(treatment.mills) / profile.getCarbRatio(treatment.mills);
+          // units:  g     =       BG      *      scalar     /          BG / U                           *     g / U
+          var delayedCarbs = ( avgActivity *  liverSensRatio / profile.getSensitivity(treatment.mills) ) * profile.getCarbRatio(treatment.mills);
           var delayMinutes = Math.round(delayedCarbs / profile.getCarbAbsorptionRate(treatment.mills) * 60);
           if (delayMinutes > 0) {
             cCalc.decayedBy.setMinutes(cCalc.decayedBy.getMinutes() + delayMinutes);

diff --git a/lib/plugins/iob.js b/lib/plugins/iob.js
@@ -38,6 +38,7 @@ function init() {
           lastBolus = treatment;
         }
         if (tIOB && tIOB.iobContrib) { totalIOB += tIOB.iobContrib; }
+        // units: BG (mg/dL or mmol/L)
         if (tIOB && tIOB.activityContrib) { totalActivity += tIOB.activityContrib; }
       }
     });
@@ -76,6 +77,7 @@ function init() {
       if (minAgo < peak) {
         var x1 = minAgo / 5 + 1;
         result.iobContrib = treatment.insulin * (1 - 0.001852 * x1 * x1 + 0.001852 * x1);
+        // units: BG (mg/dL)  = (BG/U) *    U insulin     * scalar
         result.activityContrib = sens * treatment.insulin * (2 / dia / 60 / peak) * minAgo;
 
       } else if (minAgo < 180) {
@@ -113,4 +115,4 @@ function init() {
 
 }
 
-module.exports = init;
+module.exports = init;