Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r2acaf549519854f7e6de1511d541582267f4d1e8 -rdb3ad11a6c257fe9ff2ef5f1b887c47574d8fd4e
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 2acaf549519854f7e6de1511d541582267f4d1e8)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision db3ad11a6c257fe9ff2ef5f1b887c47574d8fd4e)
@@ -46,6 +46,7 @@
 #define VENOUS_PRESSURE_SCALE               ( 14745 - VENOUS_PRESSURE_OFFSET )              ///< Scale for venous pressure sensor.
 #define VENOUS_PRESSURE_MIN_PSI             ( -30.0 )                                       ///< Minimum of scale for venous pressure sensor reading (in PSI).
 #define VENOUS_PRESSURE_MAX_PSI             ( 30.0 )                                        ///< Maximum of scale for venous pressure sensor reading (in PSI).
+#define MIN_VENOUS_PRESSURE_FOR_RAMP_MMHG   ( 0.0 )                                         ///< Minimum venous pressure during blood pump ramp up (in mmHg).
 
 #define ARTERIAL_PRESSURE_SELF_TEST_MIN     ( -300.0 )                                      ///< Minimum self-test value for arterial pressure sensor reading (in mmHg).
 #define ARTERIAL_PRESSURE_SELF_TEST_MAX     ( 100.0 )                                       ///< Maximum self-test value for arterial pressure sensor reading (in mmHg).
@@ -537,7 +538,7 @@
         // If BP is ramping up, extend range to outer limits as pressure may not yet have reached expected range.
         if ( isBloodPumpRampComplete() != TRUE )
         {
-            venLowLimit = (F32)getS32TreatmentParamLowerRangeLimit( TREATMENT_PARAM_VEN_PRESSURE_LOW_LIMIT );
+            venLowLimit = MIN_VENOUS_PRESSURE_FOR_RAMP_MMHG;
             venHighLimit = (F32)getS32TreatmentParamUpperRangeLimit( TREATMENT_PARAM_VEN_PRESSURE_HIGH_LIMIT );
         }