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Abstract
Achlorhydria is a gastrointestinal disorder where the parietal cells no longer
function and acid secretion does not occur. We report on a case where the
therapeutic use of inositol hexaniacinate (IHN) was effective for the treatment
of achlorhydria. The patient presented to the Robert Schad Naturopathic Clinic
with complaints of bloating, intermittent diarrhea, gas, chronic throat irritation,
perianal swelling and back pain related to maldigestion. The patient's initial
fasting gastric pH was 7, indicative of achlorhydria. The patient was instructed
to take 650mg three times daily of IHN, a form of niacin (nicotinic acid).
After approximately three weeks of use, the pH returned to 1, which is considered
normal. A little more than three weeks later, the gastric pH continued to
be within the normal range, but did increase to a 3. IHN might enhance the
production of hydrochloric acid (HCl) in a manner that cannot be explained
by it simply being an acid. The benefits of IHN might be due, in part, to
its stress-moderating properties upon the central nervous system. We further
postulate that IHN works by priming the parietal cells for the production
of mitochondrial adenosine triphosphate (ATP). This priming action provides
the cellular energy necessary to drive the process of generating HCl from
the parietal cells. These mechanisms of action might be responsible for the
therapeutic change in gastric acidity as demonstrated by repeated fasting
gastric pH measurements, and by the relief of gastrointestinal symptoms as
noted by the patient.
Introduction
Hypochlorhydria is a condition where the parietal cells of the stomach secrete
insufficient amounts of hydrochloric acid (HCl). Achlorhydria is simply a
more severe form of hypochlorhydria where the parietal cells no longer function
and acid secretion does not occur. The consequences of hypo- and achlorhydria
include an increased susceptibility to gastric bacterial overgrowth,1 enteric
infections,2,3 hypergastrinemia that might lead to enterochromaffin-like
cell hyperplasia and neoplasia,4-7 and malabsorption of various nutrients
(e.g., calcium, iron and zinc) and amino acids.8,9 The proper production
of HCl is therefore essential for optimal health. It renders the stomach
sterile against pathogens, prevents fungal and bacterial overgrowth of the
small intestine, facilitates the flow of bile and pancreatic enzymes, and
enables the proper absorption of protein and a variety of nutrients. When
HCl production is insufficient or absent, the gastric pH will not be sufficiently
acidic, digestion will be impaired, and numerous signs and symptoms develop.
Table 1 lists the most common signs and symptoms associated with deficient
or absent HCl production.
Table 1 here in our print magazine
We report on a case where the therapeutic use of inositol hexaniacinate
(IHN), a form of niacin (nicotinic acid), was effective for the treatment
of achlorhydria. A previous report by Prousky,10 and a subsequent report
by Prousky & Kerwin11 demonstrate that niacin is potentially an
effective nutraceutical for the treatment of hypochlorhydria and achlorhydria.
The strength of these reports might have been diminished, in part,
for the following two reasons. First, niacin is an effective anti-stress
agent12 and therefore any reduction in gastrointestinal symptoms might
simply be due to stress reduction rather than through the augmentation
of gastric acid secretion. Second, niacin is itself an acid. Its acidic
properties alone might be the reason for any improvement in gastrointestinal
symptoms, especially, if they were initially related to a deficiency
in gastric acid secretion.
We evaluated the effects that IHN has upon the gastric system by repeatedly
using the Gastro-Test®, a non-invasive diagnostic test for the immediate
determination of gastric pH.13 The Gastro-Test® compares well with gastric
intubation in pH determination and in the diagnosis of achlorhydria.13,14 We
administered the Gastro-Test® under fasting conditions since fasting
gastric pH is a reliable indicator of hypochlorhydria and achlorhydria.15,16 As will be demonstrated in this patient report, IHN does appear to enhance
the production of HCl in a manner that cannot fully be explained by it simply
being an acid.
Materials and Methods
The Gastro-Test® indicates the presence of low acid (hypochlorhydria),
no acid (achlorhydria) and bleeding (esophageal or gastric). The test consists
of a weighted gelatin capsule with 70cm of highly absorbent cotton floss attached
within the capsule. The floss is attached to one end of the capsule. The test
kit also includes a surface marking pH stick and a pH color chart.
The patient was instructed to fast for eight to twelve hours prior to the administration
of the Gastro-Test®. Water, but not food, was allowed anytime during
the fast. The patient was seated and the floss-filled capsule was placed in
the patient's mouth. The protruding string, attached to the end of the capsule,
was taped to the patient's cheek. The patient then drank one-to-two cups (approximately
240-480 ml) of water and swallowed the capsule.
The patient then lay on his left side for ten minutes. Lying down allows for
maximal contact between the floss and the gastric pool. After ten minutes,
the patient was instructed to sit in a comfortable chair with his head slightly
extended. The tape was removed from the cheek and the floss withdrawn from
the mouth. The floss was then placed on a piece of white exam paper to augment
visualization of the color change. The pH stick was rubbed along the moist
end of the string and the resultant color change was then compared to the pH
color chart. A pH of 3 or less on any part of the distal half of the floss
indicates that the stomach is secreting hydrochloric acid properly. A pH greater
than 3 indicates hypochlorhydria, whereas a pH of 5 or above indicates achlorhydria.
This procedure was performed three times on 8-27-02, once on 9-17-02, and again
on 10-09-02. No complications were seen or reported during and after the administration
of the Gastro-Test®.
Case
A 39-year old Caucasian male presented to The Robert Schad Naturopathic Clinic
(RSNC) on 8-18-02 with chief complaints of bloating, intermittent diarrhea,
gas, chronic throat irritation, perianal swelling, and back pain related
to maldigestion. The gastrointestinal complaints had persisted for the previous
10 years, reaching a peak 4 years ago. At this time the patient quit smoking
and regular coffee drinking. These dietary changes improved his symptoms
but did not completely resolve them. The patient currently works as a custodian
at a church and reports that there is little stress in his life. He has no
family history of gastrointestinal disease. He had seen numerous family physicians
for his complaints, but was never prescribed any medications. Physical examination
revealed a well-nourished male, with normal vital signs and normal heart
sounds. His skin was dry and pale, most notably along his face, upper thorax
and legs. There was also mild right-lower quadrant tenderness without rigidity
or rebound signs.
The patient returned 1-week later, 8-27-02, for three consecutive fasting Gastro-Tests®.
Each test administered 15 minutes apart. The first test revealed a fasting
gastric pH of 7, indicating marked achlorhydria. A second Gastro-Test® was
administered following a challenge with 500mg of non-sustained release niacin
(Jamieson Laboratories). The distal 5cm of the string showed a pH of 3. A change
of 4 pH points since the first Gastro-Test® clearly indicates that gastric
pH can be made more acidic by taking oral niacin. A third Gastro-Test® was
performed with an additional 1000mg of non-sustained release niacin. This time
the result, once again, demonstrated a pH of 7. It is unclear why the pH reverted
to a 7. Perhaps the parietal cells could no longer respond to the addition
of more acid with the third Gastro-Test®.
The patient was then prescribed 1000mg of non-sustained release niacin (Jamieson
Laboratories) three times each day. It was also recommended that he reduce
his intake of fried foods, especially bacon and fast-food hamburgers. He was
further instructed to have one salad daily in addition to increasing his intake
of fruits and vegetables (no exact amount was specified).
Two days after commencing the dietary and niacin treatment the patient felt
a sense of well being, increased energy, with significant improvement in his
throat irritation and perianal swelling. However, by the end of the first two
days of treatment the patient experienced a superficial rash with swelling
and pruritis along the upper thorax, with the axilla and inner thighs being
the areas most affected. He went to the emergency room of a local hospital
and was given an oral antihistamine. He was also told to discontinue the niacin.
Within 24 hours the superficial rash completely cleared.
The patient resumed his niacin treatment the next day, but was switched to
the IHN form to reduce the potential for flushing. Each IHN capsule contains
150mg of inositol and 500mg of niacin. He was instructed to take one capsule
three times daily. He came back to the RSNC on 9-17-02 for a fasting Gastro-Test®.
The patient fasted seven hours and during the day of the test did not take
any IHN. He drank as much water as he desired during the fast, but did not
consume any food. The Gastro-Test® showed a pH of 1 at the distal 8cm
of the string. The patient noticed a reduction in gastrointestinal bloating
and claimed to have better-formed stools. The patient also reported an increase
in energy. Objectively, the patient appeared more upbeat and his skin had less
dryness and more of a pinkish color compared to our initial evaluation. The
patient also remarked that his skin looked better.
The patient returned to the RSNC on 10-09-02 for a repeat Gastro-Test®.
The patient fasted six hours and during the day of the test did not take any
IHN. The Gastro-Test® showed a pH of 3 at the distal 6cm of the string.
The patient once again remarked on his improved health and almost complete
absence of gastrointestinal symptoms. A summary of the Gastro-Test® results
for the three office visits are listed in Table 2.
Table 2 here in our print magazine
Discussion
By using the Gastro-Test® we were able to demonstrate that IHN might
play a role in both the reduction of achlorhydria-related symptoms and in augmenting
gastric acid secretion.
One question that was posed concerning IHN's role in changing gastric acidity
was whether or not the decrease in gastric pH could be accounted for solely
by niacin’s inherent acidity. We referred to one of the basic chemistry
equations, the Henderson-Hasselbach equation. This equation relates pH to the
dissociation constant of an acid, the pKa, and the log of the concentration
of the protonated acid, [HA] to its deprotonated conjugate base, [A-]. This
is dependent on the amount of acid and on the volume in which the acid is in
solution.
In effect, the greater the pKa, the weaker the acid. To illustrate, the pKa
of HCl, a very strong acid, is -7 whereas, the pKa of niacin is 4.85, a relatively
weak acid.17,18 Niacin has acidic properties because the hydrogen from the
carboxylic acid group can dissociate in solution.
Niacin is a much weaker acid than HCl, and therefore, we expected that it would
not have much effect in directly increasing stomach acidity. However, it did
appear to have a significant effect in this one patient. A 1-gram dose of niacin
when hypothetically administered under fasting conditions was compared to a
1-gram dose of niacin when hypothetically administered under a non-fasting
state. In a fasting state the stomach lumen volume is approximately 50ml, and
with the addition of 1-gram of niacin calculated without any HCl present, the
pH would drop to approximately 2.8.19 If someone had taken 1-gram of niacin
with a large meal (stomach lumen volume approximately 1L or 1000ml), again
calculated without HCl being present, the pH would drop to 3.8.19 The calculations
for the fasting and non-fasting pH can be found in Table 3.
Table 3 here in our print magazine
In the case report, the patient was instructed to fast prior to the
administration of the Gastro-Test®.
On at least two occasions, the Gastro-Test® was
administered without any niacin being present in the stomach lumen.
Therefore, any change in overall gastric acidity
could not be accounted for by the direct acidifying effect of niacin.
The beneficial change in gastric acidity appears to have been the result
of IHN's biochemical role in acting as a substrate for the parietal-cell
mitochondria production of adenosine triphosphate (ATP). Half the parietal
cell volume is occupied by mitochondria,20 making
the parietal cells the largest storehouse of mitochondria among all
eukaryotic cells.21A report by Spenney,20 elucidating
the mechanisms of HCl secretion, has shown it to be an ATP-dependent
process. The ATP synthesized from
mitochondrial energy, once stimulated to breakdown mediates HCl secretion,
and provides the necessary fuel that facilitates the exchange of K+
for H+ occurring within the canalicular membrane of the parietal cell.20 Two
additional reports postulated that niacin derived NADH is essential
for optimal mitochondrial functioning, leading to the production of
ATP that drives the generation of HCl from the parietal cells.10,11
Additional support for niacin's unique biochemical role in energetically
stimulating the parietal cells has to do with the form of niacin used. Initially,
the patient was prescribed non-sustained release niacin. However, due to an
unpleasant reaction the patient was instructed to switch to IHN. When we contrast
IHN to that of niacin, there will essentially be no immediate acidifying effect
in the stomach. IHN is composed of six niacin molecules ester bonded with one
central inositol molecule. The IHN is absorbed essentially intact, and, unlike
niacin, it does not act as an acid in the stomach. Therefore, there is no mechanism
by which IHN can directly acidify the stomach. However, as we have seen clinically
in this patient, IHN does appear to cause a lowering of gastric pH with continual
daily use.
Even though our patient did not present with anxiety or neurasthenic symptoms,
the ability of IHN to moderate stress might explain some of the observed clinical
changes in both the gastric pH and in the patient’s reported improvements.
Studies have delineated the role of the central nervous system (CNS) in conducting
and processing visceral signals and suggest that alteration in brain processes
involving perception and affective responses play key factors in the pathogenesis
of functional gastrointestinal symptoms.22,23 Thus, the ability of IHN to lower
gastric pH to normal might also, in part, be due to its known moderating effects
upon the CNS.
The niacin, contained within the larger IHN molecule, converts to the nicotinamide
nucleotide coenzymes within the liver and also converts to niacinamide, the
amide form of niacin.24 Studies with niacinamide demonstrate pharmacological
effects similar to the benzodiazepine medications,25,26 supporting the putative
role of IHN in CNS modulation.
The inositol part of the IHN molecule also has beneficial effects upon the
CNS as shown in previous double-blind studies on depression,27,28 panic disorder,29 and obsessive-compulsive disorder.30 The daily amount of inositol used by our
patient, 450mg/day, was well below the 12g or more per day used in the cited
clinical studies.27-30 However, this small amount of inositol, combined with
a larger amount of niacin, might still be able to moderate stress levels and
favorably impact the gastric system by influencing the CNS.
Although not proven, IHN might favorably impact the CNS in such a way as to
reduce the patient's perception of bloating as well as other gastrointestinal
symptoms. IHN might also moderate afferent nervous transmissions from the gastric
mucosa itself. Another possible effect might be the stimulation and/or normalization
of parasympathetic tone. The overall net effect of these possible CNS (i.e.,
brain-gut) interactions would be improved gastric function since a relaxed
state facilitates optimal gastric acid release.
Evaluation & Management Strategy
We propose a clinical model (Table 4) to help the clinician evaluate and treat
upper gastrointestinal symptoms that might be due to deficient or absent
HCl production.
Table 4 here in our print magazine. Conclusion
Niacin does have an immediate acidifying effect in the stomach. However, this
effect is probably not significant enough to account for the continuous increase
in gastric acidity as seen clinically in this case. The patient switched
to the IHN form of niacin after just two days of use. After approximately
three weeks of taking 650mg of IHN three times daily, the patient's
gastric acidity reverted to normal. His gastric acid, as measured by the
Gastro-Test®, remained normal even after
he had fasted for 7 hours. Therefore, the moderating effects that IHN has
upon the CNS and its priming
of the parietal cells for the production of mitochondrial ATP, might be the
central reasons that explain the therapeutic change in gastric acidity and
the relief of symptoms as noted by the patient.
Acknowledgements
The authors would like to thank David Lescheid, PhD, ND, and Nick DeGroot,
BSc, ND for their assistance and thorough review of this manuscript. Additional
thanks goes to Jamieson Laboratories for their donation of non-sustained
release niacin tablets and HDC Corporation for their donation of the Gastro-Test® kits.
These companies did not pay for this published case report nor did they influence/oversee
any of the data contained within the case report. Written consent was obtained
from the patient for publication of this study.
Correspondence:
J. Prousky, ND, FRSH, CCNM
1255 Sheppard Ave. E.
Toronto, Ontario M2K 1E2 Canada
jprousky@ccnm.edu
Dr. Prousky is the Associate Naturopathic Medical Officer and an Assistant
Professor of Clinical Nutrition at The Canadian College of Naturopathic
Medicine. Dugald Seely is a fourth-year Clinical Intern at The Canadian
College of Naturopathic Medicine.
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