Clinical trial NCT03730909: The Effect Lactate Administration on Cerebral Blood Flow During Hypoglycemia
Official title: The Effect of Lactate Administration on Cerebral Blood Flow During Hypoglycemia; Are the Suppressive Effects of Lactate on Counterregulatory Responses to Hypoglycemia Reflected in an Altered CBF Response?
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Type1diabetes
Hypoglycemia Unawareness
Lead sponsor: Radboud University Medical Center
Sponsor class: OTHER
First posted: 2018-11-05
Enrollment: 10
Sex: ALL
Minimum age (years): 18
Maximum age (years): 50
Standard ages: ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: BASIC_SCIENCE

Brief summary: It is thought that altered brain lactate handling is involved in the development of impaired awareness of hypoglycemia (IAH), i.e. the inability to timely detect hypoglycemia in people with type 1 diabetes (T1DM). Infusion of lactate diminishes symptomatic and hormonal responses to hypoglycemia in patients with normal awareness of hypoglycemia (NAH), resembling the situation of patients with IAH. It is unknown whether this attenuating effect is due to brain lactate oxidation or the result of lactate-induced alterations of global and regional cerebral blood flow (CBF).

Normally, hypoglycemia causes a redistribution of CBF towards the thalamus, from where the sympathetic response to hypoglycemia is coordinated, but in IAH this effect is absent and global CBF is increased. We hypothesize that lactate infusion in patients with NAH will result in blunting of thalamic activation and/or enhanced global CBF. If so, these results may help delineating the pathogenesis of IAH which eventually creates new avenues to protect against the morbidity associated with hypoglycemia and IAH.

Study design: Single-blind placebo controlled, randomized cross-over intervention study Study population: T1DM patients with NAH (n=10) Intervention: On two separate occasions, patients with T1DM and NAH will undergo a hyperinsulinemic euglycemic-hypoglycemic glucose clamp with or without the infusion of exogenous lactate. ASL-MRI will be applied to measure global and regional changes in CBF.

Main study parameters/endpoints: The change in regional thalamic CBF in response to intravenous lactate infusion compared to placebo, during hypoglycemia


Eligibility criteria: Inclusion Criteria:

* Diabetes duration ≥ 1 year
* Age: 18-50 years
* Body-Mass Index: 18-30 kg/m2
* HbA1c: 42-75 mmol/mol (6-9%)
* Outcome Clarke questionnaire: 0-1
* Blood pressure: \<160/90 mmHg

Exclusion Criteria:

* Inability to provide informed consent
* Use medication other than insulin, except for oral contraceptives or stable thyroxin supplementation therapy
* Presence of any other medical condition that might interfere with the study protocol, such as brain injuries, epilepsy, a major cardiovascular disease event or cardiac failure, known liver disease, anxiety disorders or a history of panic attacks.
* Microvascular complications of T1DM: Proliferative retinopathy, symptomatic diabetic neuropathy (including autonomic neuropathy) or Nephropathy; clinical/overt albuminuria or an estimated glomerular filtration rate \<60ml/min/1.73m2.
* MRI contraindications (pregnancy, severe claustrophobia, metal parts in body)

Primary outcomes:
measure: Regional CBF in ml/100g/min measured with ASL-MRI
timeFrame: during stable euglycemia (40 minutes) and hypoglycemia (45 minutes)
Secondary outcomes:
measure: Global CBF in ml/100g/min measured with ASL-MRI
timeFrame: during stable euglycemia (40 minutes) and hypoglycemia (45 minutes)
measure: Counterregulatory hormone responses to hypoglycemia
timeFrame: during stable euglycemia (40 minutes) and hypoglycemia (45 minutes)
measure: Symptom responses to hypoglycemia
timeFrame: during stable euglycemia (40 minutes) and hypoglycemia (45 minutes)
measure: Measurements of metabolites in cell lysates or supernatants of the cultured immune cells
timeFrame: during stable euglycemia (40 minutes) and hypoglycemia (45 minutes)
Other outcomes:
Locations:
city: Nijmegen
country: Netherlands
facility: Radoud university medical center
Study officials:
References:
citation: van Meijel LA, van Asten JJA, Grandjean J, Heerschap A, Tack CJ, van der Graaf M, Wiegers EC, de Galan BE. Effect of lactate administration on cerebral blood flow during hypoglycemia in people with type 1 diabetes. BMJ Open Diabetes Res Care. 2022 Mar;10(2):e002401. doi: 10.1136/bmjdrc-2021-002401.