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1.
Cephalalgia ; 32(3): 185-97, 2012 Feb.
Article in English | MEDLINE | ID: mdl-22332207

ABSTRACT

AIM: The aim was to assess the performance of the Visual Analogue Scale (VAS) in patients recruited in a clinical trial with over the counter analgesics in headache. METHODS: The Thomapyrin Study showed the significant superiority of the fixed combination of acetylsalicylic acid + paracetamol + caffeine over the combination without caffeine, the single preparations, and placebo in the treatment of headache. Patients enrolled into the study were trained in the handling of the VAS by naming categories of a 6-point Verbal Rating Scale (VRS). These data were used to evaluate the level of order consistency between the VAS and VRS, to deduce cut-off points for rescaling the continuous VAS into a discrete ordinal scale using the receiver operating characteristic methodology, and to assess the test-retest performance. RESULTS: Approximately 75% of the patients recorded the pain intensity on the VAS in the same order as given on the VRS. However, in 12.6% of patients, the German terms 'leicht' (mild) and 'mäßig' (moderate) were mixed up regarding their order on the VAS. Substantial overlapping of the frequency distributions of the VAS assessment were found for the VRS categories mild and moderate pain as well as severe and very severe pain. Grouping of the VAS assessments into a discrete ordinal scale necessitated a non-equidistant rescaling based on the categories of the VRS. By means of analysis of the receiver operating characteristic curves, the following cut-off points were determined on a 100 mm VAS: no pain 0-2 mm, mild pain 2-17 mm, moderate pain 17-47 mm, severe pain 47-77 mm, very severe pain 77-96 mm, most severe pain imaginable 96-100 mm. Repeated assessment up to several months after the first assessment demonstrated a test-retest agreement on the VAS in 61.0-91.4% of the patients, depending on the VRS category. CONCLUSIONS: This study shows that the VRS categories cannot be presented in an equidistant manner on the VAS, and that contrary to previous assumptions, the pain intensity descriptors are less clear and can have different meanings in different languages. Therefore, both in the 3rd edition of the International Headache Classification (ICHD-III) and in the guidelines for clinical trials of patients with headache illnesses, rather than a 4-grade VRS, a 6-grade or higher level VRS or a VAS should be recommended, with correspondingly broadly defined anchor points.


Subject(s)
Analgesics/therapeutic use , Headache/drug therapy , Pain Measurement/methods , Pain Measurement/standards , Acetaminophen/administration & dosage , Adolescent , Adult , Aged , Analgesics/administration & dosage , Area Under Curve , Aspirin/administration & dosage , Caffeine/administration & dosage , Drug Combinations , Female , Humans , Male , Middle Aged , ROC Curve , Reproducibility of Results , Young Adult
2.
Cephalalgia ; 31(14): 1466-76, 2011 Oct.
Article in English | MEDLINE | ID: mdl-21908446

ABSTRACT

BACKGROUND: We investigated efficacy and tolerability of two tablets of the fixed combination of 250 mg acetylsalicylic acid (ASA) + 200 mg paracetamol + 50 mg caffeine (Thomapyrin) in comparison to two tablets of placebo in a post-hoc analysis of a subgroup of patients with severe headache. METHODS: Patients where included if they were used to treating their episodic tension-type headache or migraine attacks with non-prescription analgesics and reported a history of headache attacks characterized by at least severe pain and greatly impaired usual daily activities and treated headaches with pain intensity of at least 48 mm assessed on a 100-mm visual analogue scale and associated with greatly impaired usual daily activities. RESULTS: For the primary endpoint 'time to 50% pain relief' in this intention-to-treat subset (n = 179 patients), the fixed combination of ASA, paracetamol, and caffeine was statistically significantly superior to placebo (p = 0.0008). The superior efficacy of the triple combination could also be shown for all secondary endpoints such as time until reduction of pain intensity to 10 mm, weighted sum of pain intensity difference (%SPIDweighted), extent of impairment of daily activities, and global assessment of efficacy. Both treatments were well tolerated. The incidence of adverse events observed was low. The results for this subgroup analysis are consistent with respect to all endpoints and to the patients with non-severe headache and the overall patient population. As with all post-hoc subgroup analyses, the findings are hypothesis generating only and must be interpreted with caution. DISCUSSION: The results of this subgroup analysis confirm that the fixed combination of ASA (250 mg), paracetamol (200 mg), and caffeine (50 mg) is effective and well tolerated in a broad spectrum from mild to severe migraine and tension-type headache severity independently of the headache diagnosis.


Subject(s)
Acetaminophen/administration & dosage , Aspirin/administration & dosage , Caffeine/administration & dosage , Migraine Disorders/drug therapy , Tension-Type Headache/drug therapy , Acetaminophen/adverse effects , Adolescent , Adult , Aged , Analgesics, Non-Narcotic/administration & dosage , Analgesics, Non-Narcotic/adverse effects , Anti-Inflammatory Agents, Non-Steroidal/administration & dosage , Anti-Inflammatory Agents, Non-Steroidal/adverse effects , Aspirin/adverse effects , Caffeine/adverse effects , Double-Blind Method , Drug Combinations , Female , Humans , Male , Middle Aged , Phosphodiesterase Inhibitors/administration & dosage , Phosphodiesterase Inhibitors/adverse effects , Placebos , ROC Curve , Severity of Illness Index , Treatment Outcome , Young Adult
3.
Cephalalgia ; 29(2): 188-93, 2009 Feb.
Article in English | MEDLINE | ID: mdl-18823361

ABSTRACT

We investigated the consistency between the headache diagnosis based on medical history and three treated headache episodes diagnosed based on a diary. In a randomized double-blind study including individuals with either migraine or tension-type headache (TTH) we showed significant superiority of the fixed combination of acetylsalicylic acid + paracetamol + caffeine over the combination without caffeine, the single preparations, and placebo in the treatment of headache. A neurologist performed a classification of the usual headache episodes and each of the three treated ones in a blinded fashion based on a structured questionnaire. This was done for the 1734 patients included in the efficacy analysis who usually treated their episodic TTH or migraine attacks with non-prescription analgesics. The overall percentage of patients with migraine and TTH remained relatively stable. The treated headache episodes were between 75 and 77% migraine, 18-20% were TTH and 5-7% could not be classified. We observed some shift in headache type within patients from prior history and in treated attacks. In 60% of patients all three treated episodes were of the type initially diagnosed by the neurologist by history (56% migraine and 4% episodic TTH). Of those with an initial diagnosis of migraine, 24% had at least one attack meeting criteria for TTH. Of patients with an initial diagnosis of TTH, 54% had at least one attack meeting the diagnostic criteria for migraine. Our results demonstrate that an initial headache diagnosis does not accurately predict the headache type treated in a randomized trial. Symptom features of treated headaches should be captured to ensure that the attack is of the type targeted by the clinical trial. The International Headache Society Guidelines for controlled clinical trials should be updated accordingly.


Subject(s)
Analgesics, Non-Narcotic/therapeutic use , Migraine Disorders/diagnosis , Migraine Disorders/drug therapy , Tension-Type Headache/diagnosis , Tension-Type Headache/drug therapy , Acetaminophen/therapeutic use , Adolescent , Adult , Aged , Aspirin/therapeutic use , Caffeine/therapeutic use , Double-Blind Method , Female , Humans , Male , Middle Aged , Migraine Disorders/classification , Nonprescription Drugs/therapeutic use , Surveys and Questionnaires , Tension-Type Headache/classification , Young Adult
4.
Int J Clin Pract ; 61(6): 944-50, 2007 Jun.
Article in English | MEDLINE | ID: mdl-17504357

ABSTRACT

There are few studies supporting the effective and safe use of laxatives for constipation. This study examined the short-term efficacy and safety of sodium picosulphate in patients with chronic constipation. Patients with a history of chronic constipation for at least 3 months were randomised to receive 7 mg sodium picosulphate or placebo for three consecutive nights. Patients recorded stool frequency and consistency, straining, bloating, and pain at baseline and during treatment. Vital signs, haematocrit, serum creatinine and electrolytes were monitored. Primary end-point for efficacy was the occurrence of a response to treatment, defined as improvement in stool frequency and occurrence of straining. All 57 randomised patients (sodium picosulphate n = 29, placebo n = 28; mean age 54.8 and 54.1 years) completed the study. Sodium picosulphate produced a treatment response (improved stool frequency and straining) in 82.8% compared with 50% in the placebo group (p = 0.010) and reduced bloating more often than placebo. There were no serious adverse events and one patient with diarrhoea and another with abdominal pain in each treatment group. There were no cardiovascular effects, changes in serum haematocrit, creatinine or electrolytes in either group. This study confirmed that sodium picosulphate is an effective, well-tolerated and safe laxative in the acute treatment of constipation.


Subject(s)
Cathartics/therapeutic use , Constipation/drug therapy , Picolines/therapeutic use , Adult , Aged , Aged, 80 and over , Cathartics/adverse effects , Chronic Disease , Citrates , Defecation/drug effects , Double-Blind Method , Female , Germany , Humans , Male , Middle Aged , Organometallic Compounds , Picolines/adverse effects , Treatment Outcome
5.
Aliment Pharmacol Ther ; 23(12): 1741-8, 2006 Jun 15.
Article in English | MEDLINE | ID: mdl-16817918

ABSTRACT

AIM: To compare the efficacy and tolerability of oral hyoscine butylbromide (hereafter hyoscine) 10 mg t.d.s., paracetamol 500 mg t.d.s. and their fixed combination against placebo in patients with recurrent crampy abdominal pain. METHODS: A total of 1637 patients were entered into a four-arm double-blind study. After a 1 week placebo run-in, they were randomized to 3 weeks of treatment with one of the four therapies with assessments after 1, 2 and 3 weeks. Pain intensity (Visual Analogue Scale) and pain frequency (Verbal Rating Scale) were self-assessed daily. RESULTS: Pain intensity on the Visual Analogue Scale decreased in all treatment groups; the adjusted mean changes from baseline were 2.3, 2.4 and 2.4 cm for the hyoscine, paracetamol and combination groups, respectively, compared with 1.9 cm for the placebo group (all P < 0.0001). The Verbal Rating Scale also showed a statistically significant decrease of 0.7, 0.7 and 0.7 in the hyoscine, paracetamol and combination groups compared with 0.5 in placebo (all P < 0.0001). All treatments were well tolerated: 16%, 14%, 17% and 11% of patients on hyoscine, paracetamol, combination and placebo reported at least one adverse event. CONCLUSIONS: Hyoscine, paracetamol and their fixed combination are effective in the treatment of recurrent crampy abdominal pain and well tolerated if used three times daily continuously for 3 weeks.


Subject(s)
Abdominal Pain/drug therapy , Acetaminophen/therapeutic use , Analgesics, Non-Narcotic/therapeutic use , Butylscopolammonium Bromide/therapeutic use , Adolescent , Adult , Aged , Female , Humans , Male , Middle Aged , Recurrence , Treatment Outcome
6.
Aliment Pharmacol Ther ; 23(10): 1479-88, 2006 May 15.
Article in English | MEDLINE | ID: mdl-16669963

ABSTRACT

BACKGROUND: Although laxatives are a first-line treatment for constipation, there are few randomized placebo-controlled trials assessing their efficacy. AIM: To determine the effect and safety of oral bisacodyl on stool frequency and consistency in patients with idiopathic constipation. METHODS: 55 patients (age 19-89 years) with idiopathic constipation were recruited from eight primary care practices and randomized to receive bisacodyl, 10 mg once daily, or placebo, on three successive days following a 3-day run-in period. Patients recorded stool frequency and consistency and adverse events. RESULTS; In each treatment group, 27 patients were evaluable for efficacy. The mean number of stools per day was significantly greater in the bisacodyl-treated group (1.8/day) compared with placebo (0.95/day) over the treatment phase (P=0.0061). Mean stool consistency score improved from 'hard' (run-in) to between 'soft' and 'well-formed' during bisacodyl treatment, remaining between 'moderately hard' and 'hard' for placebo treatment (P<0.0001). The investigator's global efficacy score was superior for the bisacodyl group compared with placebo. Both treatments were well tolerated. Serum electrolyte levels and incidence of adverse events were comparable between treatment groups. CONCLUSIONS: Bisacodyl is effective and safe in improving stool frequency and consistency in acute treatment of idiopathic constipation.


Subject(s)
Bisacodyl/administration & dosage , Cathartics/administration & dosage , Constipation/drug therapy , Acute Disease , Administration, Oral , Adult , Aged , Aged, 80 and over , Bisacodyl/adverse effects , Blood Cell Count , Cathartics/adverse effects , Defecation/drug effects , Double-Blind Method , Female , Humans , Male , Middle Aged , Treatment Outcome
7.
Cephalalgia ; 25(10): 776-87, 2005 Oct.
Article in English | MEDLINE | ID: mdl-16162254

ABSTRACT

We investigated efficacy, safety, and tolerability of two tablets of the fixed combination of 250 mg acetylsalicylic acid (ASA) + 200 mg paracetamol + 50 mg caffeine (Thomapyrin) in comparison with two tablets of 250 mg ASA + 200 mg paracetamol, two tablets of 500 mg ASA, two tablets of 500 mg paracetamol, two tablets of 50 mg caffeine, and placebo in patients who were used to treating their episodic tension-type headache or migraine attacks with non-prescription analgesics. For the primary endpoint "time to 50% pain relief" in the intention-to-treat dataset (n = 1743 patients), the fixed combination of ASA, paracetamol and caffeine was statistically significantly superior to the combination without caffeine (P = 0.0181), the mono-substances ASA (P = 0.0398), paracetamol (P = 0.0016), caffeine (P < 0.0001) and placebo (P < 0.0001). All active treatments except caffeine differed significantly (P < 0.0001) from placebo. The superior efficacy of the triple combination could also be shown for all secondary endpoints such as time until reduction of pain intensity to 10 mm, weighted sum of pain intensity difference (%SPIDweighted), extent of impairment of daily activities, global assessment of efficacy. All treatments were well tolerated. The incidence of adverse events observed was low.


Subject(s)
Aspirin/administration & dosage , Caffeine/administration & dosage , Migraine Disorders/drug therapy , Migraine Disorders/epidemiology , Tension-Type Headache/drug therapy , Tension-Type Headache/epidemiology , Acetaminophen/administration & dosage , Analgesics, Non-Narcotic/administration & dosage , Anti-Inflammatory Agents, Non-Steroidal/administration & dosage , Double-Blind Method , Drug Administration Schedule , Drug Combinations , Drug Synergism , Germany/epidemiology , Humans , Migraine Disorders/diagnosis , Pain Measurement , Placebo Effect , Prognosis , Severity of Illness Index , Treatment Outcome
8.
Cephalalgia ; 21(5): 604-10, 2001 Jun.
Article in English | MEDLINE | ID: mdl-11472387

ABSTRACT

We assessed the efficacy and safety of oral single doses of 0.5 and 1 g metamizol vs. 1 g acetylsalicylic acid (ASA) in 417 patients with moderate episodic tension-type headache included in a randomized, double-blind, placebo- and active-controlled, parallel, multicentre trial. Eligibility criteria included 18-65 years of age, history of at least two episodes of tension-type headache per month in the 3 months prior to enrollment, and successful previous pain relief with a non-opioid analgesic. Treatment arms were metamizol 0.5 g (n = 102), metamizol 1 g (n = 108), ASA 1 g (n = 102) and placebo (n = 105). The analgesic efficacy of 0.5 and 1 g metamizol vs. placebo was highly statistically significant (alpha: 0.025; one-sided) for sum of pain intensity differences, maximum pain intensity difference, number of patients with at least 50% pain reduction, time to 50% pain reduction, maximum pain relief and total pain relief. A trend towards an earlier onset of a more profound pain relief of 0.5 and 1 g metamizol over 1 g ASA was noticed. All medications including placebo were almost equally safe and well tolerated.


Subject(s)
Analgesics, Non-Narcotic/therapeutic use , Anti-Inflammatory Agents, Non-Steroidal/therapeutic use , Aspirin/therapeutic use , Dipyrone/therapeutic use , Tension-Type Headache/drug therapy , Adolescent , Adult , Aged , Analgesics, Non-Narcotic/adverse effects , Anti-Inflammatory Agents, Non-Steroidal/administration & dosage , Anti-Inflammatory Agents, Non-Steroidal/adverse effects , Aspirin/adverse effects , Dipyrone/administration & dosage , Dipyrone/adverse effects , Double-Blind Method , Drug Hypersensitivity/etiology , Female , Germany , Humans , Male , Middle Aged , Nausea/chemically induced , Pain Measurement , Safety , Taste Disorders/etiology , Treatment Outcome , Vomiting/chemically induced
9.
Arzneimittelforschung ; 50(2): 109-17, 2000 Feb.
Article in English | MEDLINE | ID: mdl-10719612

ABSTRACT

UNLABELLED: Red vine leaf extract (RVLE) is a herbal medicine containing several flavonoids, with quercetin-3-O-beta-glucuronide and isoquercitrin (quercetin-3-O-beta-glycoside) as the main components. OBJECTIVE: To assess the efficacy and safety of once-daily doses of 360 and 720 mg RVLE (pharmaceutical extract code AS 195; Antistax Venenkapseln) compared to placebo in patients with stage I and incipient stage II chronic venous insufficiency (CVI). DESIGN: A 12-week, randomized, double-blind, placebo-controlled, parallel-group, multi-center study. PATIENTS: Male and female outpatients aged 25 to 75 years with stage I to stage II CVI (i.e. without extensive trophic changes), not having any other significant medical conditions and not treated with compression stockings, diuretics or other drugs affecting fluid balance. INTERVENTION: Patients were randomly assigned to a double-blind treatment with placebo, 360 mg AS 195 or 720 mg AS 195 once daily for 12 weeks, preceded and followed by a single-blind 2-week placebo treatment for baseline run-in and end-of-trial washout, respectively. Study criteria were evaluated at baseline, after 6 and 12 weeks of treatment and 2 weeks after discontinuation of treatment. RESULTS: Of the 260 patients enrolled and randomized, 219 completed the study in accordance with the protocol. In the intention-to-treat analysis (N = 257), the mean (+/- SD) lower leg volume (measured by water displacement plethysmography) of the patients treated with placebo (N = 87) increased by 15.2 +/- 90.1 g (displaced water mass) and by 33.7 +/- 96.1 g after 6 and 12 weeks compared to baseline. In contrast, for patients treated with AS 195, lower leg volume decreased, and after 12 weeks of treatment, the difference in mean lower leg volume between the active treatment groups and the placebo group was -75.9 g (95% CI: -106.1 to -45.8 g) and -99.9 g (95% CI: -130.3 to -69.6 g) for the group treated with 360-mg AS 195 (N = 86) and 720-mg AS 195 (N = 84), respectively. The changes in calf circumference showed a similar pattern: in patients treated with AS 195, both the higher dose (720 mg) and, albeit to a lesser extent, the lower dose (360 mg) resulted in a clear reduction in circumference over time, whereas, circumference remained largely unchanged in patients treated with the placebo (95% CI of the estimated treatment effects vs. placebo after 12 weeks: -1.40 to -0.56 cm and -1.73 to -0.88 cm for 360 and 720 mg AS 195, respectively). These differences were statistically significant (p < 0.001). The reductions in ankle circumference were qualitatively similar but quantitatively less marked. Subjectively, there was an improvement in key CVI symptoms (VAS) at 6 weeks with all treatments, but a further improvement at week 12 was seen only in the active treatment groups; at 12 weeks, the changes compared to baseline were significantly greater (p < 0.001) in both active treatment groups than in the placebo group. The treatments were well tolerated; Adverse events were rare and usually mild. Two adverse events (AEs) during treatment with the placebo led to hospitalization and were hence labeled as 'serious'. Three further patients were withdrawn because of AEs which occurred during treatment with the placebo. CONCLUSION: Once-daily doses of 360 and 720 mg AS 195 were confirmed to be safe and effective in the treatment of mild CVI, reducing significantly lower leg edema and circumference whilst improving key CVI-related symptoms to a clinically relevant extent. The edema reduction is at least equivalent to that reported for compression stockings and/or other edema-reducing agents. The higher dose was as well tolerated as the lower dose but resulted in a slightly greater and more sustained improvement.


Subject(s)
Plants, Medicinal/chemistry , Venous Insufficiency/drug therapy , Adult , Aged , Aged, 80 and over , Chronic Disease , Double-Blind Method , Edema/pathology , Female , Humans , Leg/blood supply , Leg/pathology , Male , Middle Aged , Plant Extracts/adverse effects , Plant Extracts/therapeutic use , Regional Blood Flow/physiology
10.
Lab Anim ; 28(1): 80-9, 1994 Jan.
Article in English | MEDLINE | ID: mdl-8158974

ABSTRACT

The occurrence of calcified foci at the junction of adrenal medulla and cortex in monkeys obtained from toxicity studies during a 10-year period is reported. The survey included reinvestigated adrenal samples from 274 male and 270 female rhesus monkeys and 52 male and 52 female cynomolgus monkeys. The incidence of calcified foci was 46% in male and 45% in female rhesus monkeys, and 6% in male cynomolgus monkeys, while their females did not show the lesion. In male rhesus monkeys, the mean number of foci was 4 for both glands, in females, 2 for the right and 4 for the left one. Initial stages indicated that the lesions develop possibly from focal apoptosis of medulla cells followed by a dystrophic mineralization. No correlation was observed concerning dose groups, test article, study length, testing facility, origin of monkeys, their sex, age, diet or final body weight. The foci of mineralization were dystrophic, species-specific in the rhesus monkey and possibly related to stress. The location of the foci at the cortico-medullary junction, precisely the location of the remnants of the fetal zone, may indicate their origin from this zone.


Subject(s)
Adrenal Cortex/pathology , Adrenal Gland Diseases/veterinary , Adrenal Medulla/pathology , Calcinosis/veterinary , Macaca fascicularis , Macaca mulatta , Monkey Diseases/pathology , Adrenal Gland Diseases/pathology , Adrenal Glands/embryology , Adrenal Glands/growth & development , Animals , Apoptosis , Calcinosis/pathology , Female , Male
11.
Naunyn Schmiedebergs Arch Pharmacol ; 348(1): 58-64, 1993 Jul.
Article in English | MEDLINE | ID: mdl-8104317

ABSTRACT

The interactions of talipexole (B-HT 920) and clonidine with selective alpha-adrenoceptor antagonists, yohimbine (alpha 2) and prazosin (alpha 1), as well as with dopamine receptor antagonists, metoclopramide (D2), domperidone (D2) and SCH23,390 (D1) were investigated in anaesthetized rabbits after i.v. administration. Both talipexole (0.03-0.1 mg/kg) and clonidine (0.01-0.03 mg/kg) dose-dependently induced hypotension and bradycardia. Talipexole had a shorter duration of action. The hypotensive effect of the alpha 2-adrenoceptor and D2 agonist talipexole (0.03 mg/kg) was antagonized by pretreatment with metoclopramide (3 mg/kg) or domperidone (0.3-3 mg/kg), but not with yohimbine (3 mg/kg), prazosin (0.1 mg/kg) or SCH23,390 (1 mg/kg). Its bradycardic effect was antagonized only by metoclopramide (3 mg/kg). The hypotensive and bradycardic effects of clonidine (0.03 mg/kg) were most effectively antagonized by yohimbine (0.3-3 mg/kg). These findings indicate that in anaesthetized rabbits after i.v. administration, talipexole may lower blood pressure by peripheral, and heart rate by central, dopamine D2 agonism.


Subject(s)
Adrenergic alpha-Agonists/antagonists & inhibitors , Azepines/antagonists & inhibitors , Blood Pressure/drug effects , Heart Rate/drug effects , Metoclopramide/pharmacology , Yohimbine/pharmacology , Animals , Benzazepines/pharmacology , Domperidone/pharmacology , Female , Male , Rabbits
12.
Lens Eye Toxic Res ; 7(3-4): 717-39, 1990.
Article in English | MEDLINE | ID: mdl-2100190

ABSTRACT

To characterize aging as a factor responsible for structural changes the retinae of 47 Wistar-derived albino rats and 50 pigmented rats of the Norway and BDE (Han) strains between the ages of 1 and maximal 36 month were examined by light and electronmicroscopy and analysed for changes in cell densities. In all 3 rat strains there was an overall decline in nuclear densities of outer layer nuclei by 38 - 50% and inner layer nuclei by 27 - 33% between the ages of 1 and 27 months. Over the same age-range the ganglion cell loss was comparable to the decline in the inner nuclear layer. Neuronal cell death occurred at all ages and was more pronounced in albino rats. Moreover, in albino rats, cones were more resistant than rods to destruction by age and ambient light. Age-related ultrastructural changes in the retinal pigment epithelial cells (RPE) were in both pigmented strains: (1) a substantial accumulation of lipofuscin, (2) an apparent thickening of the basement membrane and (3) absent or greatly enlarged pleomorphic basal infoldings. In up to 27-month old BDE (Han) and 36-month old Norway rats besides mature stage IV-melanosomes also stage III-melanosomes can be observed. Characteristic of RPE-cells in old rats of these two strains were also compound granules and compound melanosomes. In peripheral RPE-cells of albino rats premelanosomes can be sporadically detected up to 31 months of age. Age-related changes in retinal vessels were found in the superficial and deep capillary network. The only finding was a 2-3 fold increase in thickness of the capillary basement membrane.


Subject(s)
Aging/pathology , Albinism , Retina/ultrastructure , Skin Pigmentation , Animals , Female , Male , Photoreceptor Cells/ultrastructure , Pigment Epithelium of Eye/ultrastructure , Rats , Rats, Inbred BN , Rats, Inbred Strains , Retinal Ganglion Cells/ultrastructure
13.
J Pharm Sci ; 78(11): 955-9, 1989 Nov.
Article in English | MEDLINE | ID: mdl-2621581

ABSTRACT

A method is presented according to which tolerances for active ingredient release from pharmaceutical dosage forms are calculated. The procedure is based on a statistical model. In accordance with this, the mean value is specified as a measure of the amount of active ingredient released, and the standard deviation as a measure of the uniformity of the active ingredient release. The determination of drug release tolerances is standardized. Based on clinically tested samples, changes arising from the manufacture and the storage are taken into account, thus establishing a manufacturing standard. Depending on the information available, a dynamic adaption of drug release tolerances (e.g., during the development phase) is recommended.


Subject(s)
Delayed-Action Preparations , Models, Theoretical , Quality Control , Random Allocation
15.
Methods Find Exp Clin Pharmacol ; 8(11): 679-83, 1986 Nov.
Article in English | MEDLINE | ID: mdl-3807468

ABSTRACT

A test of suitability of the electroimpression tonometer from Fritz Schwarzer GmbH, Munich, for measuring intraocular pressure in dogs was performed. Intraocular pressure of 63 clinically healthy English beagles was measured in both eyes using the instrument with different plunger weights. Intraocular pressure and volume of corneal depression during measurement were determined as a function of the plunger weight from readings on the tonometer with the aid of Friedenwald's tables (2). Using Friedenwald's law and with knowledge of the rigidity coefficient, an intraocular pressure of 32.7 mmHg was found, with individual variations between 12.8 and 54.2 mmHg. The rigidity coefficient for dogs, which was determined by linear regression, was, on average, 0.0103. Differences between male and female dogs were not significant for either parameter. A conversion table for eyes with a rigidity factor of 0.0103 is attached. Intraocular pressure as a function of plunger weight and the reading of measurement is shown in mmHg. In our measurements the Schwarzer electrotonometer for determination of intraocular pressure provided easily reproducible readings.


Subject(s)
Dogs/physiology , Tonometry, Ocular/veterinary , Animals , Female , Male , Tonometry, Ocular/instrumentation
16.
Arzneimittelforschung ; 35(6): 964-9, 1985.
Article in English | MEDLINE | ID: mdl-2862877

ABSTRACT

The pharmacokinetic properties of adimolol (MEN 935), a new antihypertensive agents with predominantly beta-receptor blocking and additional alpha-adrenolytic activity were investigated in healthy volunteers. Study A subjects (n = 6) received single intravenous doses of 5 mg adimolol and single oral doses of 200 mg capsules, 200 mg tablets and 100 mg tablets on four occasions separated by at least two weeks. Study B subjects (n = 6) were given single intravenous doses of 5 mg and single oral doses of 100 mg of the 14C-labelled drug on two different occasions. Study C subjects (n = 6) were administered multiple oral doses of 100 mg adimolol daily for five days, and three weeks later 50 mg daily for five days. Adimolol plasma concentrations were assayed over seven days following each single dose using a specific and sensitive high-pressure liquid chromatographic method. The plasma concentration data obtained from the single i.v. dose studies were individually fitted to an open four-compartment model. To describe mathematically the single oral dose plasma level data, two compartments were added to the model to take care of the absorption. Irrespective of the route of administration, the doses and formulations given, all plasma concentration curves could be described with similar pharmacokinetic parameters. Plasma concentration curves predicted by the open four-compartment model were fully confirmed by the actual data obtained after chronic oral administration. The terminal half-life averaged 12 h following intravenous and 15 h after oral administration. The peak plasma concentration was reached on average 4 h following oral administration.(ABSTRACT TRUNCATED AT 250 WORDS)


Subject(s)
Adrenergic beta-Antagonists/metabolism , Propanolamines/metabolism , Administration, Oral , Adrenergic beta-Antagonists/administration & dosage , Adrenergic beta-Antagonists/blood , Adult , Biological Availability , Fasting , Humans , Injections, Intravenous , Kinetics , Male , Middle Aged , Models, Biological , Propanolamines/administration & dosage , Propanolamines/blood , Therapeutic Equivalency
17.
Arzneimittelforschung ; 35(10): 1489-94, 1985.
Article in German | MEDLINE | ID: mdl-4074402

ABSTRACT

The application of statistical tests of hypotheses in the evaluation of bioavailability studies is discussed. The necessity of correctly indicating the risk of false decisions in accordance with the hypothesis to be tested is emphasized. The procedure of evaluation presented here is performed analogously to the methods of the statistical quality control and always takes errors of the 1st kind and the 2nd kind into account. The advantageous use of the operating characteristic is pointed out. It is possible to read from these curves the effects which the size of the random sample and the experimental variation have on the reliability of the statement. The procedure is illustrated by means of numerical examples from literature.


Subject(s)
Therapeutic Equivalency , Biological Availability , Random Allocation , Statistics as Topic
18.
Arzneimittelforschung ; 35(1A): 240-3, 1985.
Article in German | MEDLINE | ID: mdl-4039164

ABSTRACT

In four subchronic and three chronic toxicity studies in rats, in which the application of pharmacologically active substances led to a reduction in body weight development, the lengths of the animals were also measured. It could be shown that a lower body weight gain was always accompanied by a reduction in body length increase. With increasing doses or higher toxicity the within-group variations of individual values were smaller and the correlation between body weight and length of the rats was generally greater.


Subject(s)
Rats/growth & development , Toxicology/methods , Aging , Animals , Biometry , Body Weight/drug effects , Female , Male , Rats/anatomy & histology
19.
Arzneimittelforschung ; 31(8A): 1360-5, 1981.
Article in German | MEDLINE | ID: mdl-7028047

ABSTRACT

After a brief account of the laboratory and animal studies of 6-cyclohexyl-1-hydroxy-4-methyl-2(1H)-pyridone, 2-aminoethanol salt (ciclopiroxolamine, Cic, Hoe 296, Batrafen) and an outline of previous clinical trials, the results of a double-blind trial with Cic cream and clotrimazole cream are reported, together with those of a large-scale trial of Cic cream in consulting practice. Used for the treatment of skin disorders diagnosed as mycoses, the effectiveness rate of Cic cream ranged from 79 to 98%, depending on the criterion used for assessment. The double-blind trial did not reveal any significant differences between its effect and that of clotrimazole cream. The incidence of side-effects can be regarded as minimal.


Subject(s)
Antifungal Agents/therapeutic use , Dermatomycoses/drug therapy , Pyridones/therapeutic use , Antifungal Agents/adverse effects , Ciclopirox , Clinical Trials as Topic , Clotrimazole/adverse effects , Clotrimazole/therapeutic use , Double-Blind Method , Humans , Pyridones/adverse effects
20.
Arzneimittelforschung ; 31(8A): 1366-8, 1981.
Article in German | MEDLINE | ID: mdl-7028048

ABSTRACT

In an open multicentre trial, the local activity and tolerance of an aqueous cream with 1% 6-cyclohexyl-1-hydroxy-4-methyl-2(1H)-pyridone, 2-aminoethanol salt (ciclopiroxolamine, Cic, Hoe 296, Batrafen) in vulvovaginal candidosis was investigated. On 7 consecutive days (on the average), a 5 cm3 amount of cream was inserted into the vagina once a day. Where necessary, the cream was also applied to the vulva. In 149 cases, the sexual partner was treated. The study initially comprised 235 patients suffering from clinically and mycologically diagnosed vulvovaginal candidosis. The results of 220 subjects could be evaluated. Judging from the cases in which data were complete, the cultural proofs at the 1st (2nd) control after treatment were negative in 90.9% (89.1%) of cases and the microscopic proofs were negative in 93.6% (92.3%). Healing was noticed in 89.9% of the cases. No indication of recurrence was observed. Side-effects, which in general were very mild, were recorded in 3.2% of the cases. Treatment was stopped in one patient.


Subject(s)
Antifungal Agents/therapeutic use , Candidiasis, Vulvovaginal/drug therapy , Pyridones/therapeutic use , Adolescent , Adult , Aged , Antifungal Agents/adverse effects , Candidiasis, Vulvovaginal/microbiology , Ciclopirox , Clinical Trials as Topic , Female , Humans , Male , Middle Aged , Pyridones/adverse effects
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