Modified Ketogenic Diet in Patients With McArdle Disease Part B

McArdle Disease Clinical Trial

Official title:

Odified Ketogenic Diet in Patients With McArdle Disease Part B - a Placebo-controlled, Cross-over Study

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04044508
• Other study ID #: H-18013022-B
• Status: Completed
• Phase: N/A
• Start date: August 3, 2019
• Est. completion date: December 1, 2022

Study information

• Verified date: February 2023
• Source: Rigshospitalet, Denmark
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

McArdle disease, glycogen storage disease type V, is a rare metabolic disease. Affected individuals are unable to utilize sugar stored as glycogen in muscle. Investigators hypothesize that a modified ketogenic diet could be a potential treatment option, by providing ketones as alternative fuel substrates for working muscle.

This blinded, placebo-controlled, cross-over study will investigate the potential effects of an optimal modified ketogenic diet found in part A (75% fat, 15%protein, 10%carbohydrates) in patients with McArdle disease compared with a healthy balanced placebo diet (>100grams of carbohydrates per day).

Description:

A blinded randomized, placebo-controlled, cross-over study to investigate the effects of a modified ketogenic diet in patients with McArdle disease.

McArdle disease, glycogen storage disease type V, is a rare metabolic disease caused by mutations in the PYGM gene resulting in absence of the enzyme muscle phosphorylase. Affected individuals are unable to utilize sugar stored as glycogen in muscle, leading to exercise intolerance, exercise-induced muscle pain, contractures and rhabdomyolysis. Currently, there are no satisfactory treatment options for McArdle disease. Ketones are feasible fuel alternatives to muscle glycogen when muscle glycogenolysis is blocked as in McArdle disease. A key element of alleviating symptoms in McArdle disease is to provide alternative fuels for energy metabolism. Ketosis can potentially provide alternative fuel substrates by provision of endogenous ketone bodies (KBs) which are desirable fuels for skeletal muscle and brain. Ketosis can be reached by fasting and can be induced by adhering to a modified ketogenic diet, which entails a high-fat, low-carbohydrate diet, which simulates the metabolic effects of fasting.

The study design is a placebo-controlled, blind, cross over design. The study will be carried out at two sites: CNMC (Copenhagen), NHNN (London). Subjects will be randomized 1:1 to receive either a modified ketogenic diet (75% fat, 15%protein, 10% carbohydrates) or a placebo diet (>100grams of carbohydrates per day) first. Subjects will follow the diet for 4 weeks, followed by 2-4 weeks wash-out, followed by 4 weeks on the opposite diet. During the 10-12 weeks trial period, subjects will visit the trial site in London on five occasions. Effects of the diet will be evaluated by improvement in exercise capacity during submaximal exercise test on a cycle ergometer. Subjective improvements will be evaluated by questionnaires and a dietary diary.

If the diet improves exercise capacity, it will provide a safe and cheap treatment option that may lead to reduced risk of muscle injury and enhance quality of life in patients with McArdle disease.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 20
• Est. completion date: December 1, 2022
• Est. primary completion date: October 1, 2022
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years to 80 Years

Eligibility

Inclusion Criteria:

• Genetically confirmed GSDV

• Patient is willing and able to provide written informed consent prior to participation.

• Patient is ambulatory.

• Women in fertile age must be willing to practice the following medically acceptable methods of birth control

Exclusion Criteria:

• Patient has any prior or current medical conditions that, in the judgment of the Investigator, would prevent the patient from safely participating in and/or completing all study requirements.

• Pregnancy or breastfeeding

• Patient does not have the cognitive capacity to understand/comprehend and complete all study assessments

• Patients with porphyria or disorders of fat metabolism (primary carnitine deficiency, carnitine palmitoyltransferase I or II, ß-oxidation defects etc.).

Related Conditions & MeSH terms

• Glycogen Storage Disease Type V
• McArdle Disease

Intervention

Dietary Supplement:
• Ketocal 4:1 liquid Nutricia (intervention)
Modified ketogenic diet
• Fortini multifibre Nutrica (placebo)
Placebo diet

Locations

Country	Name	City	State
Denmark	Copenhagen Neuromuscular Center, Rigshospitalet	Copenhagen
United Kingdom	National Hospital for Neurology and neurosurgery	London

Sponsors (2)

Lead Sponsor	Collaborator
Rigshospitalet, Denmark	University College, London

Countries where clinical trial is conducted

Denmark,  United Kingdom, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Change in mean heart rate	Change in mean heart rate (bpm) during constant load cycling exercise (30 minute submaximal cycle test). Heart rate will be measured every minute during the cycle test at all visits.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Compliance	Daily dietary diary	up 12 weeks
Secondary	Change in Indirect calorimetry	Oxidation rates measured via indirect calorimetry during constant load cycling Measured at visit 1-4.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in self-rated daily function scores	Modified SF-36 questionnaire	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in self-rated fatigue	Fatigue Severity Scale score	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in blood ketones	Ketone bodies in the blood (hydroxybutyrate+acetoacetate umol/L).	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in perceived exertion	Borg scale (scale from 6-20). During the constant load cyclinging test, subjects will be asked every minute during.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in ammonia	Blood Ammonia (umol/L). Will be measured 5 times during the cycle test at visit 1-4.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in insulin	Blood Insulin (pmol/l). Will be measured 6 times during the cycle test at visit 1-4.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in Adrenalin	Blood Adrenalin (pg/mL) Will be measured 6 times during the cycle test at visit 1-4.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in glucagon	Blood Glucagon (pmol/L). Will be measured 4 times during the cycle test at visit 1-4.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in maximal oxygen capacity	(VO2max, mL oxgen per minute) after the 30 minutes submaximal exercise test, the workload will be increased in a step vise manner to maximum.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in maximal work load	Work load (watts) after the 30 minutes submaximal exercise test, the workload will be increased in a step vise manner to maximum.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in free fatty acids	Blood Free fatty acids (umol/L). Will be measured 6 times during the cycle test at visit 1-4.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in lactate	Blood Lactate (mM). Will be measured 6 times during the cycle test at visit 1-4.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)
Secondary	Change in glucose	Blood glucose (mM). Will be measured 6 times during the cycle test at visit 1-4.	At Visit 1 (baseline), Visit 2 (4 weeks), Visit 3 (8 weeks), and Visit 4 (12 weeks)