CA2007387C - Bowel lavage composition - Google Patents
Bowel lavage compositionInfo
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- CA2007387C CA2007387C CA 2007387 CA2007387A CA2007387C CA 2007387 C CA2007387 C CA 2007387C CA 2007387 CA2007387 CA 2007387 CA 2007387 A CA2007387 A CA 2007387A CA 2007387 C CA2007387 C CA 2007387C
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K33/00—Medicinal preparations containing inorganic active ingredients
- A61K33/14—Alkali metal chlorides; Alkaline earth metal chlorides
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Abstract
The present invention is directed to a bowel lavage composition which comprises one or more of a water-soluble polymer selected from the group consisting of polyethylene glycol, dextran, dextrin, hydroxyethylated starch, polydextrose, arabic gum, pullulan and pectin; a sodium salt of an organic acid; a potassium salt of an organic acid; sodium chloride; potassium chloride and sodium sulfate, having the following formulation:
Water-soluble polymer 10 - 150 g Sodium salt of an organic acid 5 - 60 mmol Potassium salt of an organic acid 0 - 12 mmol Sodium chloride 7 - 60 mmol Potassium chloride 0 - 12 mmol Sodium sulfate 0 - 20 mmol wherein total potassium ion content in said composition ranges from 2 to 12 mEq. The bowel lavage composition is easily prepared in the form of a lavage solution when used. It is easily taken by patients, has reduced absorption of water, does not exert influence upon the electrolyte balance in a living body, has an excellent cleansing effect, does not contain hydrogen carbonate ions, and hence, is pharmaceutically stable and can be stored for a long period of time.
Water-soluble polymer 10 - 150 g Sodium salt of an organic acid 5 - 60 mmol Potassium salt of an organic acid 0 - 12 mmol Sodium chloride 7 - 60 mmol Potassium chloride 0 - 12 mmol Sodium sulfate 0 - 20 mmol wherein total potassium ion content in said composition ranges from 2 to 12 mEq. The bowel lavage composition is easily prepared in the form of a lavage solution when used. It is easily taken by patients, has reduced absorption of water, does not exert influence upon the electrolyte balance in a living body, has an excellent cleansing effect, does not contain hydrogen carbonate ions, and hence, is pharmaceutically stable and can be stored for a long period of time.
Description
- Bowel Lavage Composition The present invention relates to a bowel lavage composition which is used by dissolving it in water.
Bowel cleansing is extremely important prior to accurate diagnosis in colonoscopy or double-contrast barium enema examination and to prevent infection after surgery of the lower intestine.
For such bowel cleansing, there has hitherto been employed a modified Brown method, which comprises administering a cathartic after dietary restriction with a low-residue diet or a liquid diet for several days and conducting a high enema with a large amount of warm water just before examination or surgery to cleanse the interior of the colon. Hcwever, this method is time-consuming, painful for patients, and exerts a bad influence upon the electrolyte balance of body fluid and nutritional status.
There has been proposed a method comprising rapid ingestion of a large volume of a saline-based electrolyte solution and this method has been reported to be effective for pretreatment for colonoscopy [J. Hewitt et al., Lancet, 2, 337 (1973)].
.
_ 21~7~87 However, this method is also painful for patients since patients must take a large volume of the electrolyte - solution as much as 7 to 12 liters and further causes an absorption of a fairly large amount of sodium ion, chloride ion and water. Hence, this method cannot be used for patients with renal disease who are incapable of excreting salts or water or for aged patients.
Thereafter, a balanced electrolyte solution (hereinafter referred to as "BES") comprising sodium chloride, potassium chloride and sodium hydrogen carbonate has been proposed in order to maintain a normal electrolyte balance in the living body. Although this BES does not affect the electrolyte balance in the living bcdy so much, it is accompanied with an absorption of a fairly large volume of water.
In order to reduce such an absorption of water, an electrolyte composition supplemented with mannitol as an osmotically active agent has been proposed and confirmed to be effective. However, it is reported that mannitol in the composition is degradated by colonic bacteria to generate hydrogen gas and thereby an explosion accident in the large intestine was observed during polypectomy of the large intestine [M.A. Bigard et al., Gastroenterology, 77, 1307 (1979)].
Davis et al. have proposed an electrolyte composition employing poorly absorbable polyethylene glycol _ - 3 -2007~87 in place of mannitol as an osmotically active agent. They have further proposed a unique electrolyte composition (commercially available as "Golytely*n) where a part of the sodium chloride in the elctrolyte composition is replaced with sodium sulfate in order to inhibit absorption of sodium ion. This method has been confirmed to be useful [G.R. Davis et al., Gastroenterology, 78, 99l (1980)].
However, Golytely has a bitter tast due to the large amount of sodium sulfate contained therein, and hence it is not suitable for use in amounts large enough for intestinal washing.
Another unique electrolyte composition has been proposed which is prepared by removing sodium sulfate from the Golytely electrolyte composition, increasing the amount of polyethylene glycol and adjusting the osmotic pressure to isotonic (WO 87/00754).
It has been described in said reference that this lavage solution has a less bitter taste and reduced absorption of water and electrolyte ions. However, when compared with Golytely, the lavage solution gives a clammy feeling when used due to the high concentration of polyethylene glycol and it is expected that sodium ions in the living body are excreted since the lavage solution contains lower concentration of sodium ion. This exerts a bad influence upon the electrolyte balance in the living body. The lavage solution is further disadvantageous in that it is pharmaceutically unstable due to hydrogen *Trade mark T
A
carbonate ions contained therein and hence it is necessary to prepare it when it is about to be used and requires much time to dissolve the large amount of polyethylene glycol used in the preparation.
In order to solve the above-mentioned problems, the present inventors have firstly studied the action, effect and necessity of each component used in the conventional bowel lavage composition in dogs and rats and then have studied intensively the use of other components which have hitherto never been used for a bowel lavage composition.
As a result, it has been found that blood pH is apparently affected by the hydrogen carbonate ion level in the bowel lavage composition, that blood pH is never affected by an organic acid ion when it is used in place of the hydrogen carbonate ion, that potassium ion level which does not affect the electrolyte balance in the living body is preferably in a range as small as 2 to 12 mEq/liter, that chloride ion level is preferably in the range of from 7 to 60 mEq/liter, and that it is preferable to adjust the osmotic pressure of the aqueous solution to the preferred range of from 270 to 350 mOsm with sodium ion, an organic acid ion and a water-soluble polymer.
The object of the present invention is to provide a bowel lavage composition which can easily be taken by - patients, shows reduced absorpt1on of water, does not exert a bad influence upon the electrolyte balance in the living body and shows an excellent cleansing effect.
A
The present invention provides a bowel lavage composition which comprises one or more of a water-soluble - polymer selected from the group consisting of polyethylene glycol, dextran, dextrin, hydroxyethylated starch, polydextrose, arabic gum, pullulan and pectini a sodium salt of an organic acid; a potassium salt of an organic acid;
sodium chloride; potassium chloride and sodium sulfate, having the following formulation:
Water-soluble polymer 10 - 150 g Sodium salt of an organic acid 5 - 60 mmol Potassium salt of an organic acid 0 - 12 mmol Sodium chloride 7 - 60 mmol Potassium chloride 0 - 12 mmol Sodium sulfate 0 - 20 mmol wherein total potassium ion content in said composition ranges from 2 to 12 mEq.
The most preferable water-soluble polymer is polyethylene glycol 4000 (Japanese Pharmacopoeia).
The organic acid suitable for the above sodium salt and potassium salt thereof includes acetic acid, lactic acid, citric acid, succinic acid, malic acid, tartaric acid, etc. but the present invention is not limited thereto.
Among these organic acids, citric acid is most preferred.
Preferred formulation of the bowel lavage composition of the present invention using preferred components is as follows:
~' `_ 2007387 Polyethylene glycol 4000 50 - 120 g Sodium citrate 20 - 60 mmol Sodium chloride 20 - 50 mmol Potassium chloride 4 - 12 mmol Sodium sulfate 0 - 20 mmol The bowel lavage composition of the present invention can be prepared in the following manner. Firstly, each component is pulverized into a fine powder with a pulverizer and then sieved. Then, each component of the above formulation is uniformly mixed with each other using a mixer and then divided into a suitable unit composition with a dividing machine, e.g. for 1 liter, 2 liter, 3 liter or 4 liter lavage solution.
The lavage solution of the present invention can be prepared in accordance with a usual transfusion preparation procedure. The concentration of the intestinal wasning solution can optionally be selected ranging from about 4 times higher concentration than that of an isotonic solution to a nearly isotonic concentration (osmotic pressure, around 290 mOsm/liter) in accordance with the dilution ratio when used.
The bowel lavage composition of the present invention may also contain sweeteners,spices and the like if necessary.
The bowel lavage composition of the present invention allows for easy preparation of the lavage solution when used. The lavage solution of the present invention is easily taken by patients, has reduced absorption of water, does not exert influence upon the electrolyte balance in the living body and shows an excellent cleansing effect.
Further, the lavage solution of the present invention does not contain hydrogen carbonateions, and hence, is pharmaceutically stable and can be stored for a long period of time, which saves preparation time when used.
The present invention is illustrated by the following Examples and Experiments, but should not be construed to be limited thereto.
Example l Sodium chloride (Japanese Pharmacopoeia), potassium chloride (Japanese Pharmacopoeia) and sodium citrate (Japanese Pharmacopoeia) were sieved with a sieve of 500 ~m screen diameter. Sodium chloride (35.0 kg), potassium chloride (22.4 kg) and sodium citrate (309 kg), sieved as mentioned above, were putin a VI-500 Mixer* (manufactured by Tokuju Kosakusho K.K.) and the mixture was blended for 20 minutes to prepare a mixed electrolyte powder. Paraffin-like polyethylene glycol 4000 (Japanese Pharmacopoeia) was pulverized with Pinmil Pulverizer*(manufactured by Nara Kikai K.K.) and then sieved with a sieve of 500 ~m screen diameter to prepare pulverized polyethylene glycol 4000.
The above pulverized polyethylene glycol 4000 (225 kg) and the above mixed electrolyte powder (36.6 kg) were *Trade mark ,f `~`
putin a Vl-500 Mixer and the mixture was blended for 20 minutes to give a uniform mixture. The resulting mixed - powder was filled in an aluminum bag made of polyester, polyethylene and aluminum foil using an automatic quantitative bag-filling machine FA-400 (manufactured by Yamato Seiko K.K.) to give 1200 bags of bowel lavage composition (for 2 liter) with each bag containing 174.4 9 of the composition. The content of the composition in each bag can be varied if necessary.
Example 2 The mixed electrolyte powder (36.6 kg) prepared as in Example 1 and polydextrose (225 kg) were put in a VI-500 Mixer and the mixture was blended for 30 minutes to give a uniform mixed powder. Using this mixed powder (210 kg), the procedure of Example 1 was repeated to give 1200 bags of the bowel lavage composition each containing 174.4 9 of the mixed powder.
Examples 3 to 11 The procedure of Example 1 was repeated to give the bowel lavage compositions (for 2 liter) having the formulation as shown in Table 1.
*Trade mark Table 1 Component Example No.
(9) Polyethylene220 180 180 170 140 120 0 0 140 glycol 4000 Dextran 40 0 0 0 0 0 0 440 440 0 Hydroxyethyl- 0 0 0 0 0 0 0 0 0 ated starch Sodium 5.88 11.8 11.8 14.7 17.6 20.6 20.6 20.6 11.8 citrate Sodium 2.34 2.92 3.50 3.50 4.09 4.67 2.34 2.34 2.92 chloride Potassium 1.49 1.49 1.49 1.49 1.49 1.49 1.49 1.49 1.49 chloride Sodium 0 0 0 0 0 0 0 0 5.68 sulfate Example 12 A 100 liter dissolving vessel equipped with a stirrer was charged with polyethylene glycol 4000 (7500 9)~
sodium chloride (117 9), potassium chloride (74.6 g) and sodium citrate (Japanese Pharmacopoeia; 1030 9) and thereto was added distilled water while stirring to dissolve the mixture so that the total amount of the mixture became 100 Liters. Each 2 liter portion of this solution was poured into vessels made of a synthetic resin to give 50 lavage solutions (for 2 liter).
In accordance with the above procedure, the conventional lavage solutions BES, Golytely and ~' ~ -- 10 --2007~87 physiological saline were prepared for use in the following Experiments. Table 2 shows the components (g) contained in each 2 liter portion of the lavage solutions.
Table 2 BES Golytely PS*
Polyethylene glycol 4000 0 118 0 Sodium hydrogencarbonate 5.04 3.37 0 Sodium chloride 12.9 2.93 18.0 Potassium chloride 1.49 1.49 0 Sodium sulfate 0 11.4 0 (Note) PS: Physiological saline Experiment 1 (Cleansing effect) The lavage compositions (for 2 liter) prepared in Examples 1, 2, 3, 4, 8, 10 and 11 were dissolved in distilled water to give the lavage solutions having a total amount of 2 liters. These lavage solutions and Golytely were tested for their cleansing effect in rats.
Male SD rats of 8 to 10 weeks old, which have been fasted for 24 hours, were divided into 5 animals in each group. Each 20 ml/kg of the lavage solutions of the present invention and Golytely were orally administered to the animals 15 times at 10 minute intervals. Ten minutes after the last administration, whole intestinal contents from pyloric orifice to rectum were obtained and the dry weight thereof was measured. The results are shown in Table 3.
-2~07387 It was found that both the lavage solutions of the present invention and Golytely showed good cleansing effect.
Table 3 Dry weight (mg) Cleansing degree (%) Control 350 + 41 Ex. 1 111 + 13 68.3 Ex. 2 177 + 20 49.4 Ex. 3 177 + 49 49.4 Ex. 4 108 + 19 69.1 Ex. 8 127 + 20 63.7 Ex. 10 149 + 23 57.4 Ex. 11 125 + 15 64.3 Golytely 137 + 30 60.9 Experiment 2 (Effect on the intestinal electrolyte balance) The lavage compositions (for 2 liter) prepared in Examples 1, 3, 4, 5, 6, 7, 8 and 11 were dissolved in distilled water to give the lavage solutions having a total amount of 2 liters. These lavage solutions and the above three kinds of solutions prepared in Example 12 (BES, Golytely and physiological saline) were tested for their effect on the intestinal electrolyte balance.
The test animals and the administration route were the same as those in Experiment 1. Ten minutes after the last administration, the intestinal contents in the colon were obtained and centrifuged. The supernatant was analyzed for the electrolyte concentration with a sodium-potassium automatic analyzer NOVA l*(manufactured by Nova Biomedical) and a chloride counter CL-6MP*(manufactured by Hiranuma).
*Trade mark -The results are shown in Table 4. It was found that the bowel lavage compositions of the present invention, BES and Golytely exerted substantially no influence upon the intestinal electrolyte balance.
Table 4 Changes in intestinal electrolyte level (mM) Na+ K+ Cl+
Ex. 1 - 3.8 -1.59 -17 Ex. 3 - 9.2 -5.32 -13 Ex. 4 - 5.6 -3.49 -19 Ex. 5 -12.4 -4.00 -23 Ex. 6 - 7.1 -2.12 -21 Ex. 7 - 7.7 -2.12 -26 Ex. 8 -10.6 -1.01 -31 Ex. 11 -11.1 -2.01 -23 BES -15.3 -0.49 -22 Golytely - 8.9 -2.12 -28 Physiological-43.0 +7.97 -40 saline (Note): The symbols + and - show an increase and a decrease of the electrolyte levels from those in the original solutions, respectively.
Experiment 3 (Effect on the serum electrolyte balance) The lavage compositions (for 2 liter) prepared in Examples 1 to 11 were dissolved in distilled water to give the lavage solutions having a total amount of 2 liters.
These lavage solutions and the above three types of solutions prepared in Example 12 (BES, Golytely and physiological saline) were tested for their effect on the serum electrolyte balance.
~007387 The test animals and the administration route were the same as those in Experiment 1. Ten minutes after the ~ last administration, the animals were anesthetized with ether and blood was obtained from the abdominal aorta to measure the serum electrolyte level. The pH value and the hematocrit value which can be used as an index of water-absorption were also measured. Table 5 shows the results of both serum electrolyte level and hematocrit value.
As clearly shown in Table 5, the lavage solutions of the present invention, BES, Golytely and physiological saline exerted substantially no influence upon serum electrolyte level, blood pH and hematocrit value.
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~0~7387 Experiment 4 Fifteen healthy men and women aging from 22 to 38 years old each drank 100 ml of the lavage solutions of the present invention prepared in Examples 1, 2, 6, and 11, and Golytely for evaluating the taste thereof.
The evaluation was made using the following scale:
(A) Very tasty (B) Rather tasty (C) Drinkable with patience (D) Unsavory and undrinkable The results are shown in Table 6. It was found that the lavage solutions of the present invention had an improved taste and were much more tasty than Golytely.
Table 6 (Score No.) Example No.
Golytely Total15 15 lS 15 15 A~
Bowel cleansing is extremely important prior to accurate diagnosis in colonoscopy or double-contrast barium enema examination and to prevent infection after surgery of the lower intestine.
For such bowel cleansing, there has hitherto been employed a modified Brown method, which comprises administering a cathartic after dietary restriction with a low-residue diet or a liquid diet for several days and conducting a high enema with a large amount of warm water just before examination or surgery to cleanse the interior of the colon. Hcwever, this method is time-consuming, painful for patients, and exerts a bad influence upon the electrolyte balance of body fluid and nutritional status.
There has been proposed a method comprising rapid ingestion of a large volume of a saline-based electrolyte solution and this method has been reported to be effective for pretreatment for colonoscopy [J. Hewitt et al., Lancet, 2, 337 (1973)].
.
_ 21~7~87 However, this method is also painful for patients since patients must take a large volume of the electrolyte - solution as much as 7 to 12 liters and further causes an absorption of a fairly large amount of sodium ion, chloride ion and water. Hence, this method cannot be used for patients with renal disease who are incapable of excreting salts or water or for aged patients.
Thereafter, a balanced electrolyte solution (hereinafter referred to as "BES") comprising sodium chloride, potassium chloride and sodium hydrogen carbonate has been proposed in order to maintain a normal electrolyte balance in the living body. Although this BES does not affect the electrolyte balance in the living bcdy so much, it is accompanied with an absorption of a fairly large volume of water.
In order to reduce such an absorption of water, an electrolyte composition supplemented with mannitol as an osmotically active agent has been proposed and confirmed to be effective. However, it is reported that mannitol in the composition is degradated by colonic bacteria to generate hydrogen gas and thereby an explosion accident in the large intestine was observed during polypectomy of the large intestine [M.A. Bigard et al., Gastroenterology, 77, 1307 (1979)].
Davis et al. have proposed an electrolyte composition employing poorly absorbable polyethylene glycol _ - 3 -2007~87 in place of mannitol as an osmotically active agent. They have further proposed a unique electrolyte composition (commercially available as "Golytely*n) where a part of the sodium chloride in the elctrolyte composition is replaced with sodium sulfate in order to inhibit absorption of sodium ion. This method has been confirmed to be useful [G.R. Davis et al., Gastroenterology, 78, 99l (1980)].
However, Golytely has a bitter tast due to the large amount of sodium sulfate contained therein, and hence it is not suitable for use in amounts large enough for intestinal washing.
Another unique electrolyte composition has been proposed which is prepared by removing sodium sulfate from the Golytely electrolyte composition, increasing the amount of polyethylene glycol and adjusting the osmotic pressure to isotonic (WO 87/00754).
It has been described in said reference that this lavage solution has a less bitter taste and reduced absorption of water and electrolyte ions. However, when compared with Golytely, the lavage solution gives a clammy feeling when used due to the high concentration of polyethylene glycol and it is expected that sodium ions in the living body are excreted since the lavage solution contains lower concentration of sodium ion. This exerts a bad influence upon the electrolyte balance in the living body. The lavage solution is further disadvantageous in that it is pharmaceutically unstable due to hydrogen *Trade mark T
A
carbonate ions contained therein and hence it is necessary to prepare it when it is about to be used and requires much time to dissolve the large amount of polyethylene glycol used in the preparation.
In order to solve the above-mentioned problems, the present inventors have firstly studied the action, effect and necessity of each component used in the conventional bowel lavage composition in dogs and rats and then have studied intensively the use of other components which have hitherto never been used for a bowel lavage composition.
As a result, it has been found that blood pH is apparently affected by the hydrogen carbonate ion level in the bowel lavage composition, that blood pH is never affected by an organic acid ion when it is used in place of the hydrogen carbonate ion, that potassium ion level which does not affect the electrolyte balance in the living body is preferably in a range as small as 2 to 12 mEq/liter, that chloride ion level is preferably in the range of from 7 to 60 mEq/liter, and that it is preferable to adjust the osmotic pressure of the aqueous solution to the preferred range of from 270 to 350 mOsm with sodium ion, an organic acid ion and a water-soluble polymer.
The object of the present invention is to provide a bowel lavage composition which can easily be taken by - patients, shows reduced absorpt1on of water, does not exert a bad influence upon the electrolyte balance in the living body and shows an excellent cleansing effect.
A
The present invention provides a bowel lavage composition which comprises one or more of a water-soluble - polymer selected from the group consisting of polyethylene glycol, dextran, dextrin, hydroxyethylated starch, polydextrose, arabic gum, pullulan and pectini a sodium salt of an organic acid; a potassium salt of an organic acid;
sodium chloride; potassium chloride and sodium sulfate, having the following formulation:
Water-soluble polymer 10 - 150 g Sodium salt of an organic acid 5 - 60 mmol Potassium salt of an organic acid 0 - 12 mmol Sodium chloride 7 - 60 mmol Potassium chloride 0 - 12 mmol Sodium sulfate 0 - 20 mmol wherein total potassium ion content in said composition ranges from 2 to 12 mEq.
The most preferable water-soluble polymer is polyethylene glycol 4000 (Japanese Pharmacopoeia).
The organic acid suitable for the above sodium salt and potassium salt thereof includes acetic acid, lactic acid, citric acid, succinic acid, malic acid, tartaric acid, etc. but the present invention is not limited thereto.
Among these organic acids, citric acid is most preferred.
Preferred formulation of the bowel lavage composition of the present invention using preferred components is as follows:
~' `_ 2007387 Polyethylene glycol 4000 50 - 120 g Sodium citrate 20 - 60 mmol Sodium chloride 20 - 50 mmol Potassium chloride 4 - 12 mmol Sodium sulfate 0 - 20 mmol The bowel lavage composition of the present invention can be prepared in the following manner. Firstly, each component is pulverized into a fine powder with a pulverizer and then sieved. Then, each component of the above formulation is uniformly mixed with each other using a mixer and then divided into a suitable unit composition with a dividing machine, e.g. for 1 liter, 2 liter, 3 liter or 4 liter lavage solution.
The lavage solution of the present invention can be prepared in accordance with a usual transfusion preparation procedure. The concentration of the intestinal wasning solution can optionally be selected ranging from about 4 times higher concentration than that of an isotonic solution to a nearly isotonic concentration (osmotic pressure, around 290 mOsm/liter) in accordance with the dilution ratio when used.
The bowel lavage composition of the present invention may also contain sweeteners,spices and the like if necessary.
The bowel lavage composition of the present invention allows for easy preparation of the lavage solution when used. The lavage solution of the present invention is easily taken by patients, has reduced absorption of water, does not exert influence upon the electrolyte balance in the living body and shows an excellent cleansing effect.
Further, the lavage solution of the present invention does not contain hydrogen carbonateions, and hence, is pharmaceutically stable and can be stored for a long period of time, which saves preparation time when used.
The present invention is illustrated by the following Examples and Experiments, but should not be construed to be limited thereto.
Example l Sodium chloride (Japanese Pharmacopoeia), potassium chloride (Japanese Pharmacopoeia) and sodium citrate (Japanese Pharmacopoeia) were sieved with a sieve of 500 ~m screen diameter. Sodium chloride (35.0 kg), potassium chloride (22.4 kg) and sodium citrate (309 kg), sieved as mentioned above, were putin a VI-500 Mixer* (manufactured by Tokuju Kosakusho K.K.) and the mixture was blended for 20 minutes to prepare a mixed electrolyte powder. Paraffin-like polyethylene glycol 4000 (Japanese Pharmacopoeia) was pulverized with Pinmil Pulverizer*(manufactured by Nara Kikai K.K.) and then sieved with a sieve of 500 ~m screen diameter to prepare pulverized polyethylene glycol 4000.
The above pulverized polyethylene glycol 4000 (225 kg) and the above mixed electrolyte powder (36.6 kg) were *Trade mark ,f `~`
putin a Vl-500 Mixer and the mixture was blended for 20 minutes to give a uniform mixture. The resulting mixed - powder was filled in an aluminum bag made of polyester, polyethylene and aluminum foil using an automatic quantitative bag-filling machine FA-400 (manufactured by Yamato Seiko K.K.) to give 1200 bags of bowel lavage composition (for 2 liter) with each bag containing 174.4 9 of the composition. The content of the composition in each bag can be varied if necessary.
Example 2 The mixed electrolyte powder (36.6 kg) prepared as in Example 1 and polydextrose (225 kg) were put in a VI-500 Mixer and the mixture was blended for 30 minutes to give a uniform mixed powder. Using this mixed powder (210 kg), the procedure of Example 1 was repeated to give 1200 bags of the bowel lavage composition each containing 174.4 9 of the mixed powder.
Examples 3 to 11 The procedure of Example 1 was repeated to give the bowel lavage compositions (for 2 liter) having the formulation as shown in Table 1.
*Trade mark Table 1 Component Example No.
(9) Polyethylene220 180 180 170 140 120 0 0 140 glycol 4000 Dextran 40 0 0 0 0 0 0 440 440 0 Hydroxyethyl- 0 0 0 0 0 0 0 0 0 ated starch Sodium 5.88 11.8 11.8 14.7 17.6 20.6 20.6 20.6 11.8 citrate Sodium 2.34 2.92 3.50 3.50 4.09 4.67 2.34 2.34 2.92 chloride Potassium 1.49 1.49 1.49 1.49 1.49 1.49 1.49 1.49 1.49 chloride Sodium 0 0 0 0 0 0 0 0 5.68 sulfate Example 12 A 100 liter dissolving vessel equipped with a stirrer was charged with polyethylene glycol 4000 (7500 9)~
sodium chloride (117 9), potassium chloride (74.6 g) and sodium citrate (Japanese Pharmacopoeia; 1030 9) and thereto was added distilled water while stirring to dissolve the mixture so that the total amount of the mixture became 100 Liters. Each 2 liter portion of this solution was poured into vessels made of a synthetic resin to give 50 lavage solutions (for 2 liter).
In accordance with the above procedure, the conventional lavage solutions BES, Golytely and ~' ~ -- 10 --2007~87 physiological saline were prepared for use in the following Experiments. Table 2 shows the components (g) contained in each 2 liter portion of the lavage solutions.
Table 2 BES Golytely PS*
Polyethylene glycol 4000 0 118 0 Sodium hydrogencarbonate 5.04 3.37 0 Sodium chloride 12.9 2.93 18.0 Potassium chloride 1.49 1.49 0 Sodium sulfate 0 11.4 0 (Note) PS: Physiological saline Experiment 1 (Cleansing effect) The lavage compositions (for 2 liter) prepared in Examples 1, 2, 3, 4, 8, 10 and 11 were dissolved in distilled water to give the lavage solutions having a total amount of 2 liters. These lavage solutions and Golytely were tested for their cleansing effect in rats.
Male SD rats of 8 to 10 weeks old, which have been fasted for 24 hours, were divided into 5 animals in each group. Each 20 ml/kg of the lavage solutions of the present invention and Golytely were orally administered to the animals 15 times at 10 minute intervals. Ten minutes after the last administration, whole intestinal contents from pyloric orifice to rectum were obtained and the dry weight thereof was measured. The results are shown in Table 3.
-2~07387 It was found that both the lavage solutions of the present invention and Golytely showed good cleansing effect.
Table 3 Dry weight (mg) Cleansing degree (%) Control 350 + 41 Ex. 1 111 + 13 68.3 Ex. 2 177 + 20 49.4 Ex. 3 177 + 49 49.4 Ex. 4 108 + 19 69.1 Ex. 8 127 + 20 63.7 Ex. 10 149 + 23 57.4 Ex. 11 125 + 15 64.3 Golytely 137 + 30 60.9 Experiment 2 (Effect on the intestinal electrolyte balance) The lavage compositions (for 2 liter) prepared in Examples 1, 3, 4, 5, 6, 7, 8 and 11 were dissolved in distilled water to give the lavage solutions having a total amount of 2 liters. These lavage solutions and the above three kinds of solutions prepared in Example 12 (BES, Golytely and physiological saline) were tested for their effect on the intestinal electrolyte balance.
The test animals and the administration route were the same as those in Experiment 1. Ten minutes after the last administration, the intestinal contents in the colon were obtained and centrifuged. The supernatant was analyzed for the electrolyte concentration with a sodium-potassium automatic analyzer NOVA l*(manufactured by Nova Biomedical) and a chloride counter CL-6MP*(manufactured by Hiranuma).
*Trade mark -The results are shown in Table 4. It was found that the bowel lavage compositions of the present invention, BES and Golytely exerted substantially no influence upon the intestinal electrolyte balance.
Table 4 Changes in intestinal electrolyte level (mM) Na+ K+ Cl+
Ex. 1 - 3.8 -1.59 -17 Ex. 3 - 9.2 -5.32 -13 Ex. 4 - 5.6 -3.49 -19 Ex. 5 -12.4 -4.00 -23 Ex. 6 - 7.1 -2.12 -21 Ex. 7 - 7.7 -2.12 -26 Ex. 8 -10.6 -1.01 -31 Ex. 11 -11.1 -2.01 -23 BES -15.3 -0.49 -22 Golytely - 8.9 -2.12 -28 Physiological-43.0 +7.97 -40 saline (Note): The symbols + and - show an increase and a decrease of the electrolyte levels from those in the original solutions, respectively.
Experiment 3 (Effect on the serum electrolyte balance) The lavage compositions (for 2 liter) prepared in Examples 1 to 11 were dissolved in distilled water to give the lavage solutions having a total amount of 2 liters.
These lavage solutions and the above three types of solutions prepared in Example 12 (BES, Golytely and physiological saline) were tested for their effect on the serum electrolyte balance.
~007387 The test animals and the administration route were the same as those in Experiment 1. Ten minutes after the ~ last administration, the animals were anesthetized with ether and blood was obtained from the abdominal aorta to measure the serum electrolyte level. The pH value and the hematocrit value which can be used as an index of water-absorption were also measured. Table 5 shows the results of both serum electrolyte level and hematocrit value.
As clearly shown in Table 5, the lavage solutions of the present invention, BES, Golytely and physiological saline exerted substantially no influence upon serum electrolyte level, blood pH and hematocrit value.
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~ a. ~ c~ o a~ o o c~ o~ ~ o u~ ~ ID ~O
,-l ...............
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a~ o ~ o ~1 o o ,~ o ~ o o o o ~ o cn +
Z I +l +l +l +l +l +l +l +l +l +l +l +l +l +l .
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~0~7387 Experiment 4 Fifteen healthy men and women aging from 22 to 38 years old each drank 100 ml of the lavage solutions of the present invention prepared in Examples 1, 2, 6, and 11, and Golytely for evaluating the taste thereof.
The evaluation was made using the following scale:
(A) Very tasty (B) Rather tasty (C) Drinkable with patience (D) Unsavory and undrinkable The results are shown in Table 6. It was found that the lavage solutions of the present invention had an improved taste and were much more tasty than Golytely.
Table 6 (Score No.) Example No.
Golytely Total15 15 lS 15 15 A~
Claims (2)
1. A bowel lavage composition which comprises one or more of a water-soluble polymer selected from the group consisting of polyethylene glycol, dextran, dextrin, hydroxyethylated starch, polydextrose, arabic gum, pullulan and pectin; a sodium salt of an organic acid; a potassium salt of an organic acid; sodium chloride; potassium chloride and sodium sulfate, having the following formulation:
Water-soluble polymer 10 - 150 g Sodium salt of an organic acid 5 - 60 mmol Potassium salt of an organic acid 0 - 12 mmol Sodium chloride 7 - 60 mmol Potassium chloride 0 - 12 mmol Sodium sulfate 0 - 20 mmol wherein total potassium ion content in said composition ranges from 2 to 12 mEq.
Water-soluble polymer 10 - 150 g Sodium salt of an organic acid 5 - 60 mmol Potassium salt of an organic acid 0 - 12 mmol Sodium chloride 7 - 60 mmol Potassium chloride 0 - 12 mmol Sodium sulfate 0 - 20 mmol wherein total potassium ion content in said composition ranges from 2 to 12 mEq.
2. The composition of claim 1 which is dissolved in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2007387 CA2007387C (en) | 1990-01-09 | 1990-01-09 | Bowel lavage composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2007387 CA2007387C (en) | 1990-01-09 | 1990-01-09 | Bowel lavage composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2007387A1 CA2007387A1 (en) | 1991-07-09 |
| CA2007387C true CA2007387C (en) | 1996-06-11 |
Family
ID=4143970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2007387 Expired - Fee Related CA2007387C (en) | 1990-01-09 | 1990-01-09 | Bowel lavage composition |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2007387C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60320429D1 (en) * | 2002-09-13 | 2008-05-29 | Metcon Medicin Ab | COMPOSITION AND METHOD FOR USE IN DARM CLEANING PROCEDURES |
-
1990
- 1990-01-09 CA CA 2007387 patent/CA2007387C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
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| CA2007387A1 (en) | 1991-07-09 |
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