Full text of DOI:10.1007/BF03016883

958
OBSTETRICAL AND PEDIATRIC ANESTHESIA
The anesthetic management of ventricular septal
defect (VSD) repair in a child with mitochondrial
cytopathy
[La démarche anesthésique adoptée pendant la réparation d’une communication
interventriculaire (CIV) chez une enfant présentant une cytopathie mitochondriale]
Ehab Farag MD FRCA, Maged Argalious MD, Samer Narouze MD, Glenn E. DeBoer MD, Julie Tome MD
Purpose: To present the anesthetic management for the correction
of a ventricular septal defect (VSD) in a patient with multiple acyl
CoA dehydrogenase deficiency (glutaric aciduria type II; GAII). A
review of the literature about anesthetic management of patients
with mitochondrial diseases undergoing cardiopulmonary bypass
(CPB) is also included.
a bien toléré l’intervention et connu une bonne récupération.
Conclusion : L’anesthésie de patients atteints de maladie mitochon-
driale exige une normoglycémie, une normothermie et l’absence de
stress dans le but de préserver la production d’énergie par les mito-
chondries lésées.
Clinical features: An 11-yr-old girl with GAII manifested as severe
hypoglycemia since she was a newborn and generalized muscle
weakness. She underwent open-heart surgery for VSD correction
with CPB. The anesthetic management avoided inhalational anes-
thetics, maintained the blood sugar within normal limits and contin-
ued normothermia during CPB in order to avoid the stress of
hypothermia for her abnormal mitochondria. The patient tolerated
the procedure well and experienced a good recovery.
Conclusion: The anesthetic management of patients with any
mitochondrial disease requires normoglycemia, normothermia and
the avoidance of metabolic stress in order to preserve energy pro-
duction by the diseased mitochondria.
LUTARIC aciduria type II (GAII) is one
type of mitochondrial cytopathy that
affects ß-oxidation of fatty acids. In this
G
form of mitochondrial disease, glucose is
utilized as the sole source of energy. Thus during
metabolic stress (i.e., fasting), severe hypoglycemia
and nonketotic metabolic acidosis result. There are
very few actual reports but many anecdotal stories of
poor postanesthesia outcomes in patients with mito-
chondrial diseases. This is a case report of a child with
GAII in which general anesthesia and normothermic
cardiopulmonary bypass (CPB) were used for the cor-
rection of a ventricular septal defect.
Objectif : Présenter la démarche anesthésique adoptée pour la cor-
rection d’une communication interventriculaire (CIV) chez une enfant
souffrant de déficience multiple d’acyl-CoA déshydrogénase (acidurie
glutarique de type II ; AGII). Nous incluons également une revue de la
prise en charge anesthésique de patients atteints de maladies mito-
chondriales qui subissent une circulation extracorporelle (CEC).
Éléments cliniques : Une enfant de 11 ans, atteinte d’AGII,
présentait une hypoglycémie sévère depuis sa naissance et une fai-
blesse musculaire généralisée. Elle a subi une opération à cœur ouvert
pour la correction d’une CIV sous CEC. Nous avons évité les
anesthésiques d’inhalation, maintenu la glycémie dans les limites de la
normale et poursuivi la normothermie pendant la CEC afin d’éviter le
stress de l’hypothermie sur les anomalies mitochondriales. La patiente
Case report
An 11-yr-old girl weighing 50 kg presented for elec-
tive closure of a perimembranous ventricular septal
defect (VSD). The patient was diagnosed with GAII at
seven months of age. Symptoms of her mitochondrial
cytopathy were worsening, and included “metabolic
episodes” which consisted of frontal and occipital
migraine headaches accompanied by diplopia and
vomiting. These “episodes” were treated with glucose
From Sections of Pediatrics and Congenital Heart Disease Anesthesia, The Cleveland Clinic Foundation, Cleveland, Ohio, USA.
Address correspondence to: Dr. Julie Tome, Staff Anesthesiologist, The Cleveland Clinic Foundation, Division of Anesthesia and Critical
Care Medicine, 9500 Euclid Ave., Cleveland, OH 44195, USA. Phone: 216-444-8389; Fax: 216-445-2536; E-mail: TOMEJ@CCF.ORG
Accepted for publication March 22, 2002.
Revision accepted July 22, 2002.
CAN J ANESTH 2002 / 49: 9 / pp 958–962

Farag et al.: MITOCHONDRIAL CYTOPATHY AND CPB
959
infusions and dexamethasone. Due to severe hypo-
glycemia (< 1.9 mmol·L–1), the patient received rou-
tine overnight enteral feedings via a percutaneous
endoscopic gastrostomy tube to maintain normal
blood glucose level and to avoid development of
hypoglycemia. The urgent need for permanent
intravascular access for parenteral nutrition and meta-
bolic management was anticipated. The presence of
VSD (though hemodynamically insignificant) was
considered to be a major risk factor for endocarditis
and possible air embolism.
dure and during CPB. Serum blood glucose was 5
mmol·L–1 after anesthetic induction with a lactate level
of 1.3 mmol·L–1. During CPB serum blood sugar was
in the 10–12.9 mmol·L–1 range and serum lactate level
peaked at 2.6 mmol·L–1 (normal up to 2.0 mmol·L–1)
measured immediately post-CPB. Total bypass time
was 33 min and aortic cross-clamp time was 11 min.
The CPB pump was primed with a solution contain-
ing dexamethasone in the dose of 0.25 mg·kg–1, plas-
malyte, 25% albumin, NaHCO3 and calcium chloride.
The pump flow was kept at 100–128 mL·kg–1·min–1 to
maintain a cardiac index of 2.4 L·m2·min–1 and venous
oxyhemoglobin saturation was between 75–80%.
Closure of the VSD was confirmed by a trans-
esophageal echocardiography contrast study. Central
venous pressure was maintained post-bypass at 6
mmHg with boluses of 0.9% normal saline as needed.
During recovery, insulin was administered to keep
blood glucose at 10–12 mmol·L–1. Sodium nitroprus-
side 1.5 µg·kg–1·min–1 was administered for two hours
postoperatively to control blood pressure. She was
transfused to a hematocrit of 30% after CPB with
pump blood. The postoperative course was uneventful
and the patient was discharged from the hospital on
the third day.
Patient’s past medical history
She was born at 33 weeks gestation with a VSD and
atrial septal defect (ASD). At seven days of age, she had
a cardiac arrest at home and was diagnosed with severe
apnea and a seizure disorder. A failure to thrive investi-
gation at seven months included a skin biopsy and
fibroblast culture, which were consistent with GAII.
She remained on an apnea monitor until 18 months, at
which time her ASD had closed spontaneously. The
patient became progressively more symptomatic with
gastric dysmotility, asthma and proximal muscle weak-
ness often requiring wheelchair use by the age of nine
years. Mental status and intelligence were normal for
age. The family history was significant in that her moth-
er, brother, and maternal aunts were all diagnosed with
mitochondrial disorders. Echocardiography showed
normal left ventricle function and size and a small per-
imembranous VSD with left to right flow maximum
velocity of 4.7 m·sec–1. No other abnormalities were
detected. Her intolerance to lorazepam resulted in
severe agitation.
The child denied awareness and discomfort during
the procedure, and family or caretakers have denied
any increase in muscle weakness or other neurologic
disturbances. Her medications on discharge were the
same as preoperatively: Coenzyme Q10, Vitamin B,
carnitine, amitriptyline, and paroxetine.
Discussion
Mitochondrial cytopathies can be divided into two
main categories. In the first category, the respiratory
complexes in the respiratory chain are affected as in
MELAS and Kearns-Sayre syndromes.1–4 In the sec-
ond category, lipid metabolism is affected either due
to a defect in the transferred fatty acids across the
mitochondrial membrane which is caused by carnitine
deficiency or due to a defect of ß-oxidation of fatty
acids. In both cases, the energy production from lipid
metabolism will be insufficient.1
GAII was first described by Przyrembel in 1976 as a
deficiency in the electron transfer flavoprotein (ETF)
that moves electrons from flavine-adenine dineclotide
(FAD) of acyl CoA dehydrogenases to coenzyme Q in
the respiratory chain. This leads to the accumulation of
free fatty acids in the plasma and the urinary excretion of
large amounts of organic acids. This condition differs
from glutaric aciduria type 1, characterized by the accu-
mulation of glutaric acid, which is due to a recessively
inherited deficiency of glutaryl CoA dehydrogenase.5–8
Anesthetic management
During preoperative fast, the patient received 10%
dextrose in 0.25% normal saline infusions at 90
mL·hr–1. After routine monitors were applied, induc-
tion of anesthesia was managed with ketamine 50 mg
(1 mg·kg–1) and fentanyl 100 µg (2 µg·kg–1); intuba-
tion was facilitated with rocuronium 25 mg (0.5
mg·kg–1). A 20 gauge arterial catheter was inserted
into the left radial artery and a central venous pressure
line (CVP) into the right internal jugular vein.
Anesthesia was maintained with N2O in O2 in pre-
CPB period then with 100% O2 after bypass period
with intermittent doses of ketamine (total 150 mg) to
prevent awareness and rocuronium was titrated to
train-of-four (TOF) response. Analgesia was provided
by a remifentanyl infusion at the dose of 0.2
µg·kg–1·min–1 and a morphine infusion at 40
µg·kg–1·hr–1. Body core temperature was maintained
between 35.9°C and 36.4°C throughout the proce-

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CANADIAN JOURNAL OF ANESTHESIA
GAII has been categorized into three subgroups. The
first group is the neonatal onset GAII that includes con-
genital anomalies such as dysmorphic facies (potter
type), polycystic kidneys and other general abnormali-
ties. The second group is the neonatal onset GAII with-
out congenital abnormalities, which presents
immediately after birth or in the first days of neonatal
life. The patients usually have symptoms of respiratory
distress, hypoglycemia and metabolic acidosis without
ketosis. The third group is the late onset GAII which is
characterized by repeated episodes of hypoglycemia
accompanied by elevated serum concentrations of free
fatty acids without ketosis, fatty infiltration of the liver,
hepatic dysfunction and proximal myopathy. This disease
is usually characterized by a “generalized sweaty foot
odour.” The urine of these patients contains increased
amounts of organic acids such as glutaric acid, ethyl-
malonic acid and dicarboxylic acids with six to ten car-
bons. The hypoglycemia is due to impaired oxidation of
fatty acids resulting in decreased hepatic gluconeogene-
sis. The increased amounts of glutaryl CoA and ethyl-
malonic acid lead to the inhibition of mitochondrial
uptake of malate, which is a rate-limiting step in gluco-
neogenesis.9 GAII is usually accompanied by lactic aci-
dosis, which arises from a severe energy deficiency in the
muscle and from an impaired recycling of lactate to glu-
cose via the Cori cycle.9 The acidosis leads to impaired
renal excretion of uric acid resulting in hyperuricemia.9
Riboflavin which acts as the precursor of FAD which is
the common coenzyme of acyl CoA dehydrogenase, can
be used as a treatment for GAII exacerbations.10
There is no single scheme or method to follow for
the anesthetic management of patients with mito-
chondrial cytopathies. By reviewing the literature,
every agent and technique have been used successful-
ly, however, there are certain controversial issues that
should be considered.4,11 Volatile anesthetics have
been used uneventfully in several case reports.12,13
However, in one case report a malignant hyperthermia
type episode occurred when inhalation anesthetics and
succinylcholine were used.14 In our case, potent
inhalational anesthetics were avoided due to the fear
of lactic acidosis and the inability to distinguish post-
bypass hyper metabolic states from anesthesia-induced
malignant hyperpyrexia. Additionally, myocardial
depressant effects can be caused by volatile anesthetics
due to reductions in intracellular calcium concentra-
tion, and inhibition of the sodium-calcium exchange
mechanism. Recently it has been shown that
halothane and sevoflurane have inhibitory effects
upon norepinephrine-induced glucose uptake in
neonatal cardiomyocytes. This decrease in glucose
uptake is associated with lowered intracellular calcium
and diminished myocardial contractility. Glucose rep-
resents the sole energy supply to the newborn heart in
contrast to the adult heart, which depends mainly
upon fatty acids as a source of energy.15 This finding
emphasizes the importance of avoiding hypoglycemia
in pediatric patients in order to avoid myocardial
depression. This is especially important when dealing
with children who have impaired glucose homeostasis
and are unable to utilize fatty acids as in the child pre-
sented in this report. In spite of the age of the patient,
the myocardial cells can still be immature due to mito-
chondrial disease. It has been documented that the
mitochondrial cytopathies in general can be accompa-
nied by cardiomyopathy,16,17 however, fortunately, our
patient has normal cardiac function. One of the sites
of action of inhalation anesthetics is the gas-1 (gener-
al anesthetic sensitive) gene, which encodes 49-KDa
(IP) subunit of complex 1 of the respiratory chain.
The proteins 49-KDa (IP) are essential for the proper
function of complex 1 of the respiratory chain. The
volatile anesthetics inhibit gas-1 gene and decrease the
function of complex 118 thus enhancing the inhibito-
ry effects of volatile anesthetics in the patients with
mitochondrial diseases. N2O in vitro increases NO
and is known to inhibit cis-acotinase and iron con-
taining electron transport enzymes and may also affect
energy production.4 However, we chose to use N2O
to reduce the risk of awareness, in lieu of benzodi-
azepines. In order to maintain metabolic homeostasis
in our patient, Ringer’s lactate was avoided to prevent
an exacerbation of lactic acidosis. Instead, dextrose
10% in 0.25% normal saline was titrated to serum glu-
cose levels of 10–12 mmol·L–1. Third space losses
were replaced with a normal saline infusion.
The use of hypothermic CPB (to 28°C) has been
reported in a patient with mitochondrial disease.19
The 41-yr-old patient with Kearns-Sayre syndrome
underwent hypothermic CPB for aortic coarctation
repair, aortic valve repair and patent ductus arteriosus
ligation. However, a normothermic CPB technique
was used in our patient to achieve many goals. Liver
function and hepatic mitochondrial redox potentials
are measured by arterial ketone body ratio (AKBR)
and hepatic venous ketone body ratio, which is usual-
ly calculated by the ratio of acetoacetate to 3-hydrox-
ybutarate. This potential is better maintained with
normothermic CPB than with hypothermic CPB. The
complement system activity and the immune system
are better maintained with normothermic CPB due to
a better AKBR thus decreasing the production of
immune mediators during CPB and inflammatory
processes as well. Also with low hepatic mitochondri-
al activity, phagocytosis by Kupffer cells and the retic-

Farag et al.: MITOCHONDRIAL CYTOPATHY AND CPB
961
2 Petty RKH, Harding AE, Morgan-Hughes JA. The
clinical features of mitochondrial myopathy. Brain
1986; 109: 915–38.
3 Wallace JJ, Perndt H, Skinner M. Anaesthesia and
mitochondrial disease. Paediatr Anaesth 1998; 8:
249–54.
uloendothelial system activity decline which increases
in the incidence of postoperative infections.20,21 In this
case, AKBR was not measured, however, lactic acid
level was measured as a global index of anaerobic
metabolism. Also, during hypothermic CPB the
increase of free radical potential is high due to
increased tissue PaO2 levels, which can have a delete-
rious effect upon cellular functions especially in
patients with mitochondrial disease.22 Because mito-
chondria uses oxidative metabolism to produce ener-
gy to achieve and maintain normothermia in the early
postoperative period, we felt that compulsive mainte-
nance of core and surface body temperatures during
CPB and the post-CPB periods were essential to avoid
further metabolic stress in this patient.
Although it has been reported that patients with
mitochondrial cytopathies may have decreased ventila-
tory response to hypoxia and hypercarbia,23,24 this did
not occur in the present case. Vigilant monitoring of
respiratory function should be maintained post major
surgery in an intensive care unit. Muscle relaxants are
often avoided in mitochondrial cytopathy patients due
to reports of prolonged recovery times.25,26 We chose
intermittent doses of rocuronium for lack of its car-
diovascular effects and intermediate duration. The
relaxation was adequate and the patient did not show
impaired neuromuscular function, with a complete
recovery time of less than one hour after the last dose.
4 Farag E, Barsoum S, Spagnuolo S, Tetzlaff JE.
Anesthesia and muscle disease. Am J Anesthesiol 2000;
27: 491–501.
5 Mooy PD, Przyrembel H, Giesberts MAH, Scholte HR,
Blom W, van Gelderen HH. Glutaric aciduria type II:
treatment with riboflavine, carnitine and insulin. Eur J
Pediatr 1984; 143: 92–5.
6 Sweetman L, Nyhan WL, Trauner DA, Merritt TA,
Singh M. Glutaric aciduria type II. J Pediatr 1980; 96:
1020–6.
7 Goodman SI, Frerman FE. Glutaric acidaemia type II
(multiple acyl-CoA dehydrogenation deficiency). J
Inherit Metab Dis 1984; 7(Suppl 1): 33–7.
8 Gregersen N, Kolvraa S, Rasmussen K, et al.
Biochemical studies in a patient with defects in the
metabolism of acyl-CoA and sarcosine: another possi-
ble case of glutaric aciduria type II. J Inherit Metab
Dis 1980; 3: 67–72.
9 Dusheiko G, Kew MC, Joffe BI, Lewin JR, Mantagos S,
Tanaka K. Recurrent hypoglycemia associated with
glutaric aciduria type II in an adult. N Engl J Med
1979; 301: 1405–9.
10 Harpey JP, Charpentier C, Goodman SI, Darbois Y,
Lefebvre G, Sebbah J. Multiple acyl-CoA dehydrogenase
deficiency occurring in pregnancy and caused by a
defect in riboflavin metabolism in the mother. Study of
a kindred with seven deaths in infancy: value of
riboflavin therapy in preventing this syndrome. J
Pediatr 1983: 103: 394–8.
11 Maslow A, Lisbon A. Anesthetic considerations in
patients with mitochondrial dysfunction. Anesth Analg
1993; 76: 884–6.
Conclusion
We report the anesthetic management of a pediatric
patient with a mitochondrial cytopathy, GAII under-
going normothermic CPB. Maintaining normother-
mia, normoglycemia and avoiding metabolic stress are
important issues in perioperative management. Our
patient had a successful outcome from this procedure.
Parents, caretakers, surgeons, pediatric intensivists and
treating pediatricians must all be aware of the issues
involved with the care of patients with mitochondrial
cytopathies and prepare for untoward metabolic and
neurologic complications.
12 Lauwers MH, Van Lersberghe C, Camu F. Inhalation
anesthesia and the Kearns-Sayre syndrome. Anaesthesia
1994; 49: 876–8.
13 Burns AM, Shelly MP. Anaesthesia for patients with
mitochondrial myopathy. Anaesthesia 1989; 44: 975–7.
14 Ohtani Y, Miike T, Ishitsu T, Matsuda I, Tamari H. A
case of malignant hyperthermia with mitochondrial
dysfunction (Letter). Brain Dev 1985; 7: 249.
15 Kudoh A, Matsuki A. Halothane and sevoflurane
decrease norepinephrine-stimulated glucose transport
in neonatal cardiomyocyte. Anesth Analg 2000; 91:
1151–9.
Acknowledgement
We thank Dr. Emad Mossad, Head Section of
Anesthesia for congenital heart disease at The
Cleveland Clinic Foundation, for his help and advice
in preparing this manuscript.
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