Biomedical subjects

M Kern

Publications and source records attributed to M Kern.

At least 73 records · Page 4Linked to original sources

PubMed2000

Long-term resin bond strength to zirconia ceramic.

PURPOSE: The aim of this in vitro study was to evaluate the long-term bond strength of adhesive bonding systems to yttrium-oxide-partially-stabilized zirconia ceramic (YPSZ). MATERIALS AND METHODS: Plexiglas tubes filled with resin composite were bonded to industrially manufactured zirconia ceramic disks (96% ZrO2 stabilized by 4% Y2O3). After air abrading the ceramic and ultrasonic cleansing, groups of 16 samples were bonded in an alignment apparatus using 7 different bonding methods. Subgroups of 8 bonded samples were tested for tensile strength following storage in distilled water at 37 degrees C either for 3 days or 2 years. In addition, the 2-year samples were thermocycled 37,500 times. The statistical analyses were conducted with the Kruskal-Wallis test followed by multiple pair-wise comparison of the groups using the Wilcoxon rank sum test. RESULTS: A moderate to relatively high initial bond strength was achieved by air abrasion alone, the additional use of a silane, or acrylizing the YPSZ surface in combination with a conventional bis-GMA resin composite. However, these methods failed spontaneously over storage time. The use of the bis-GMA resin composite after tribochemical silica coating of YPSZ and the use of a polyacid-modified resin composite after air abrasion of YPSZ resulted in a high initial bond strength which decreased significantly over storage time. A durable resin bond strength to YPSZ was achieved only after air abrasion of YPSZ and using one of two resin composites containing a special phosphate monomer. CONCLUSION: A durable bond strength to YPSZ was achieved only by using resin composites containing a special adhesive monomer.

Acrylates↗

PubMed1999

Factors affecting broadband ultrasound attenuation results of the calcaneus using a gel-coupled quantitative ultrasound scanning system.

This study aimed to assess the factors that may influence the distribution and description of broadband ultrasound attenuation (BUA) and to identify specific criteria for diagnostic consideration when collecting BUA reference data. Two hundred Caucasian women (aged 20-79 years) without a history of atraumatic fractures or medicines known to affect bone metabolism were selected for this study. Medical and menstrual history, medication usage, family history of osteoporosis (FHO), physical activity, activities of daily living (ADL), dietary calcium intake, as well as smoking and alcohol consumption were obtained. Broadband ultrasound attenuation (BUA, dB/MHz) was determined in the right foot using a new gel-coupled ultrasound system. BUA was significantly associated with age (p<0.001), body weight (p<0.001), level of physical activity (p = 0.024) and dietary calcium intake (p = 0.023). Smoking, alcohol and coffee consumption and ADL were not associated with BUA (p>0.05). There were no differences in BUA (p>0.05) between those women who reported taking medications or had diseases (known to not affect bone metabolism), were using contraceptives, taking vitamin/mineral supplements and/or had traumatic fractures and their counterparts who did not report these characteristics. Premenopausal women with a FHO had significantly lower BUA values compared with those without a FHO (p = 0.013). When those participants with a FHO were removed from the sample, the peak BUA value was 1.1-4.4% higher and the variability (SD) was reduced by about 3.3-9.3% depending on which age range was used to define the peak BUA value. Consequently, an additional 4.5% of the population were classified as having a T-score <-2. Our results suggest that the impact on BUA of risk factors such as a FHO, body weight, physical activity and dietary calcium intake is similar to that on bone mineral density obtained by dual-energy X-ray absorptiometry (DXA), and thus provides further information on the comparability of quantitative ultrasound and DXA for assessment of risk of fracture. The criteria for calculating the T-score need further study to determine whether young adults with FHO should be included and what cutoff age range should be used in collecting peak values of quantitative ultrasound parameters.

Adult↗

PubMed1999

Wear of composite resin veneering materials in a dual-axis chewing simulator.

The attritional wear of human enamel and four different composite resins for the veneering of crowns was evaluated in a dual-axis chewing simulator over up to 1200000 loading cycles. Enamel showed less wear than the composite resins. However, an ultrafine compact-filled composite resin (Targis) showed a wear not statistically significantly different from that of enamel. The other composite resins showed a statistically significantly higher wear than enamel regardless whether microfine, ultrafine midway-filled or ultrafine compact-filled.

Analysis of Variance↗

PubMed1999

Coronary blood flow reserve and wall motion recovery in patients undergoing angioplasty for myocardial infarction.

AIMS: The aim of this study was to evaluate the relationship between coronary flow reserve and the recovery of wall motion contractility in patients with recent myocardial infarction. METHODS AND RESULTS: Nineteen patients (55 +/- 8 years) undergoing balloon angioplasty for recent myocardial infarction were studied. After angioplasty, coronary flow reserve was lower in the infarct-related artery than in a reference artery, 2.2 +/- 0.6 and 2.8 +/- 0.7, respectively, P < 0.05. There was no immediate correlation between coronary blood flow reserve measured after angioplasty and wall motion index. There was a negative correlation between coronary flow reserve and the number of necrotic segments (r = -0.43; P0.006). At the 4 month control angiogram, there was a significant increase in both left ventricular ejection fraction (59 +/- 14% vs 51 +/- 13%; P < 0.05) and wall motion index (-0.63 +/- 1.2 vs -1.94 +/- 0.9 units SD, P = 0.005). In patients in whom wall motion improved (> 1 unit SD), the immediate coronary flow reserve was higher (P < 0.05) than in patients without improved wall motion. In this group, the increase in wall motion index was correlated to the coronary blood flow reserve (r = 0.55; P < 0.02). CONCLUSION: These data show that after myocardial infarction, coronary flow reserve is associated with myocardial viability.

Aged↗

PubMed1999

Lubeluzole following traumatic brain injury in the rat.

Lubeluzole, a novel nitric oxide synthase (NOS) pathway modulator, was shown to be neuroprotective in cerebral ischemia as studied in animal models and clinical trials. The present study investigated the effect of lubeluzole on contusion volume and brain edema following traumatic brain injury. Sprague-Dawley rats (n = 36) were subjected to cortical impact injury. Lubeluzole (0.8 mg/kg i.v.; n = 18) or a corresponding volume of vehicle (n = 18) was injected 15 and 75 minutes following trauma. Animals were sacrificed 24 hours following trauma. Contusion volume was measured planimetrically from coronal slices stained with hematoxylin and eosin. In this group, T2-weighted magnetic resonance imaging (MRI) was also performed 90 minutes and 6 and 24 hours after trauma. Hemispheric swelling and water content were determined gravimetrically 24 hours after trauma. In this group, intracranial pressure (ICP), mean arterial blood pressure (MABP), and cerebral perfusion pressure (CPP) were monitored for 30 minutes before sacrifice. Lubeluzole did not reduce contusion volume, hemispheric swelling, or water content. ICP, MABP, and the resulting CPP did not differ between treated and untreated rats 24 hours after injury. T2-weighted MRI revealed a higher volume of edema at 90 minutes after trauma in treated rats. However, at 6 and 24 hours after trauma, no significant difference was discernible. Under these experimental conditions, lubeluzole fails to exert beneficial effects following experimental traumatic brain injury (TBI).

Animals↗

PubMed1999

Effect of pharyngeal stimulation on the motor function of the esophagus and its sphincters.

OBJECTIVE/HYPOTHESIS: Sensory impulses from the pharynx induce contraction of the upper esophageal sphincter (UES), relaxation of the lower esophageal sphincter (LES), and inhibition of peristalsis. To determine 1) the magnitude of UES contractile response to threshold volume of fluid that induces LES relaxation and 2) the effect of rapid pharyngeal air stimulation on LES resting pressure and its concurrent influence on the UES and progression of esophageal peristalsis. METHODS: Eleven healthy volunteers (age, 31 +/- 2 y) were studied by concurrent UES, esophagealbody, and LES manometry. RESULTS: At a threshold volume of 0.3 +/- 0.05 mL, injections of water into the pharynx directed posteriorly, resulted in complete LES relaxation. Duration of these relaxations averaged 19 +/- 1 seconds. In 10 of 11 subjects, these relaxations were accompanied by a simultaneous increase in UES resting tone that averaged 142% +/- 27% above preinjection values. Pharyngeal stimulation by rapid air injection resulted in complete LES relaxation in 8 of the 11 subjects (threshold volume, 14 +/- 6 mL). Five of 8 developed a concurrent mild increase in resting UES pressure (17% +/- 6% above preinjection values) (P < .05). Pharyngeal water injection inhibited the progression of the peristaltic pressure wave at all tested sites and in all subjects, but pharyngeal air injection in only 2 of the 11 studied subjects. CONCLUSIONS: The inhibitory effect of pharyngeal water injection on LES resting pressure is accompanied by a substantial contractile effect on the UES. Although stimulation of the pharynx by rapid air injection may induce LES relaxation, its inhibitory effect on esophageal peristalsis and stimulatory effect on UES pressure are negligible compared with that of water injection.

Adult↗

PubMed1999

Comparison of upper esophageal sphincter opening in healthy asymptomatic young and elderly volunteers.

Deglutitive upper esophageal sphincter opening (UES) in the elderly has been incompletely studied. Our aim was to determine in the elderly the temporal and dimensional characteristics of deglutitive UES opening; anterior and superior hyoid and laryngeal excursions as measures of distracting forces imparted on the UES; and hypopharyngeal intrabolus pressure (IBP). Fourteen healthy elderly and 14 healthy young volunteers were studied by concurrent videofluoroscopy and hypopharyngeal manometry during swallowing of 5- and 10-mL barium boluses. The anteroposterior UES diameter, as well as the anterior hyoid bone and laryngeal excursion, was significantly smaller in the elderly compared to the young (p < .05) for 5-mL barium boluses, but not for 10-mL boluses. The lateral diameter of UES opening was similar between groups for all boluses. The IBP for 5- and 10-mL swallows in the elderly was significantly higher than that in the young (p < .05). We conclude that anteroposterior deglutitive UES opening and hyoid bone and thyroid cartilage anterior excursion are reduced in the elderly. These changes are associated with increased IBP, suggesting a higher pharyngeal outflow resistance in the elderly compared to the young.

Adult↗

PubMed1999

Effect of cerebral perfusion pressure on contusion volume following impact injury.

OBJECT: Although it is generally acknowledged that a sufficient cerebral perfusion pressure (CPP) is necessary for treatment of severe head injury, the optimum CPP is still a subject of debate. The purpose of this study was to investigate the effect of various levels of blood pressure and, thereby, CPP on posttraumatic contusion volume. METHODS: The left hemispheres of 60 rats were subjected to controlled cortical impact injury (CCII). In one group of animals the mean arterial blood pressure (MABP) was lowered for 30 minutes to 80, 70, 60, 50, or 40 mm Hg 4 hours after contusion by using hypobaric hypotension. In another group of animals the MABP was elevated for 3 hours to 120 or 140 mm Hg 4 hours after contusion by administering dopamine. The MABP was not changed in respective control groups. Intracranial pressure (ICP) was monitored with an ICP microsensor. The rats were killed 28 hours after trauma occurred and contusion volume was assessed using hematoxylin and eosin-stained coronal slices. No significant change in contusion volume was caused by a decrease in MABP from 94 to 80 mm Hg (ICP 12+/-1 mm Hg), but a reduction of MABP to 70 mm Hg (ICP 9+/-1 mm Hg) significantly increased the contusion volume (p < 0.05). A further reduction of MABP led to an even more enlarged contusion volume. Although an elevation of MABP to 120 mm Hg (ICP 16+/-2 mm Hg) did not significantly affect contusion volume, there was a significant increase in the contusion volume at 140 mm Hg MABP (p < 0.05; ICP 18+/-1 mm Hg). CONCLUSION: Under these experimental conditions, CPP should be kept within 70 to 105 mm Hg to minimize posttraumatic contusion volume. A CPP of 60 mm Hg and lower as well as a CPP of 120 mm Hg and higher should be considered detrimental.

Animals↗

PubMed1999

All-ceramic posts and cores: the state of the art.

Metal posts used to restore endodontically treated teeth may shine through all-ceramic crowns and thin gingival tissue. When nonprecious alloys are used, corrosion products may lead to discoloration. All-ceramic posts and cores can be used in combination with all-ceramic crowns to prevent these problems. All-ceramic posts and cores are highly biocompatible and will almost always increase the translucency of an all-ceramic restoration. The purpose of this article is to describe the fabrication of all-ceramic posts and cores, using high-toughness ceramic materials such as alumina or zirconia ceramics, through 4 different techniques: the slip-casting technique; the copy-milling technique; the 2-piece technique, which involves a prefabricated zirconia ceramic post and a copy-milled alumina or zirconia ceramic core; and the heat-press technique, which involves a prefabricated zirconia ceramic post and a heat-pressed glass-ceramic core. Indications, contraindications, advantages, and disadvantages of the different techniques are compared.

Ceramics↗

PubMed1999

Evaluating a test protocol for predicting maximum lactate steady state.

BACKGROUND: Maximum lactate steady state (MLSS) is defined as the highest steady state exercise level one can maintain while also maintaining an equilibrium between the elimination of blood lactate and the diffusion of lactate into the blood. MLSS is an excellent tool for assessing fitness level, predicting endurance performance, and designing training programs. METHODS: This investigation assesses the validity of the Lactate Minimum Test (LMT), which consists of inducing lactic acidosis through a VO2peak test, followed by an eight-minute walking recovery and an incremental exercise test, to determine if the running velocity associated with the minimum lactate value predicts the MLSS velocity. Following this LMT, two constant velocity 28-minute runs were performed, one at the predicted MLSS velocity (trial 1) and the other 0.13 m sec-1 (4-8%) above the predicted MLSS velocity (trial 2). Ten active female subjects participated (32 +/- 7 yrs (mean +/- SD); 65.7 +/- 16.4 kg; VO2peak 40.0 +/- 7.5 ml.kg-1.min-1). RESULTS: During trial 1, there was a -0.6 +/- 0.3 mmol l-1 (mean +/- SE) change in lactate. Based on a definition of lactate steady state (LSS) as less than a 0.5 mmol.l-1 increase, this value signified LSS. A similar comparison during trial 2 revealed a 1.8 +/- 0.3 mmol.l-1 increase in lactate, signifying a workload above LSS and therefore confirming trial 1 as the maximum LSS (MLSS). CONCLUSIONS: These results suggest that the test protocol accurately predicted the MLSS velocity.

Adult↗

PubMed1998

Low levels of inorganic lead noncompetitively inhibit mu-calpain.

Calpain is a ubiquitous calcium-dependent cysteine protease, whose cytoskeletal protein substrates suggest that it may be important in neuronal differentiation. Lead (Pb2+) is known to substitute for Ca2+ in a variety of intracellular processes, and interferes with the development of hippocampal neurons in vitro. We found that free Pb2+ at 1 nM does not activate calpain in the absence of Ca2+. Pb2+ inhibited the activity of calpain; the degree of calpain inhibition was dependent on an interaction between concentrations of both Ca2+ and Pb2+. In the presence of 1 microM free Ca2+, 10 pM free Pb2+ reduced calpain activity, but in the presence of 100 microM free Ca2+, 1 nM free Pb2+ failed to inhibit calpain. This provides evidence that Pb2+ competes for the Ca2+ binding sites on calpain. In the presence of 40 microM free Ca2+, 1 nM free Pb2+ significantly reduces Vmax without altering Km, suggesting that Pb2+ acts as a noncompetitive inhibitor of calpain. Inhibition of calpain is one mechanism by which Pb2+ may interfere with neuronal development.

Calcium↗

PubMed1998

[10 years Swiss bone marrow donor registry].

The Swiss Bone Marrow Donor Registry was established 1988 as a project of Swiss Transplant. Up to the end of 1997, 13,500 unrelated volunteer donors have been added to the central registry in Bern in cooperation with the regional transfusion centers of Switzerland. During this period, the registry responded to over 15,000 international search requests. 67 matching Swiss donors were found for patients all over the world. On the other hand, 77 Swiss patients received unrelated bone marrow transplantation from international donors. In 1997, 24 donors were selected from the Swiss registry and 21 bone marrow transplantations were performed, which is more than in any year before. The most recent developments are peripheral blood stem cell donation and the creation of cord blood banks.

Bone Marrow Transplantation↗

PubMed1998

Bonding to zirconia ceramic: adhesion methods and their durability.

OBJECTIVES: Resin bonding to yttrium-oxide--partially-stabilized zirconia ceramic (YPSZ) cannot be established by standard methods that are utilized for conventional silica-based dental ceramics. It was our hypothesis that adhesive bonding methods suitable for glass-infiltrated alumina ceramic can also be used to bond successfully to YPSZ. To prove this hypothesis, bonding methods suitable for alumina ceramic were used on YPSZ and the tensile bond strength and their durability evaluated in vitro. METHODS: Plexiglass tubes filled with resin composite were bonded to YPSZ discs following various adhesion protocols. Groups of 16 samples were bonded using seven different bonding methods. Subgroups of eight bonded samples were tested for tensile strength following storage in distilled water (37 degrees C) for either 3 or 150 days. In addition, the 150 day samples were thermal cycled 37,500 times as a method to stress the bond interface. The statistical analysis was made with the Kruskal-Wallis test followed by multiple pair-wise comparisons of the groups using the Wilcoxon rank sum test. RESULTS: Sandblasting alone, the additional use of a silane or acrylizing resulted in an initial bond of a conventional BisGMA resin composite to YPSZ which failed spontaneously over storage time. The use of the BisGMA resin composite after tribochemical silica coating of YPSZ and the use of a polyacid-modified resin composite after sandblasting of YPSZ resulted in an initial bond which decreased significantly over storage time (p = 0.05). A durable resin bond to YPSZ was achieved only after sandblasting the ceramic and using one of two resin composites containing a special phosphate monomer. SIGNIFICANCE: A durable bond to YPSZ was achieved only by using resin composites with a special adhesive monomer. Therefore, the hypothesis of the study was partially proved as a durable bond to alumina ceramic is achieved with the same resin composites. However, it was partially disproved as tribochemical silica coating of YPSZ did not result in a durable resin bond as it does on glass-infiltrated alumina ceramic.

Bisphenol A-Glycidyl Methacrylate↗

PubMed1998

Bonding to alumina ceramic in restorative dentistry: clinical results over up to 5 years.

OBJECTIVES: The purpose of this clinical pilot study was to evaluate the resin bond to alumina ceramic in vivo when using a bonding method which had been shown to be successful in laboratory testing. METHODS: Seventeen resin-bonded all-ceramic bridges and splints fabricated from a glass-infiltrated alumina ceramic were tribochemically silica coated and resin bonded to their abutment teeth. The patients were recalled every 6 months to evaluate the restorations with regard to function and possible failures. RESULTS: Over a mean observation time of 3.8 +/- 1.6 years some ceramic fractures occurred. However, the resin bond between the teeth and the alumina ceramic always remained stable. CONCLUSIONS: Silica coating of alumina ceramic resulted in a durable resin bond over up to 5 years.

Adult↗

PubMed1998

Xanthine dehydrogenase from the phototrophic purple bacterium Rhodobacter capsulatus is more similar to its eukaryotic counterparts than to prokaryotic molybdenum enzymes.

Fourteen Rhodobacter capsulatus mutants unable to grow with xanthine as sole nitrogen source were isolated by random Tn5 mutagenesis. Five of these Tn5 insertions were mapped within two adjacent chromosomal EcoRI fragments hybridizing to oligonucleotides synthesized according to conserved amino acid sequences of eukaryotic xanthine dehydrogenases. DNA sequence analysis of this region revealed two open reading frames, designated xdhA and xdhB, encoding xanthine dehydrogenase. The deduced amino acid sequence of XDHA contains binding sites for two [2Fe-2S] clusters and FAD, whereas XDHB is predicted to contain the molybdopterin cofactor. In contrast to R. capsulatus, these three cofactor binding sites reside within a single polypeptide chain in eukaryotic xanthine dehydrogenases. The amino acid sequence of xanthine dehydrogenase from R. capsulatus showed a higher degree of similarity to eukaryotic xanthine dehydrogenases than to the xanthine dehydrogenase-related aldehyde oxidoreductase from Desulphovibrio gigas. The expression of an xdhA-lacZ fusion was induced when hypoxanthine or xanthine was added as sole nitrogen source. Mutations in nifR1 (ntrC) and nifR4 (rpoN, encoding sigma54) had no influence on xdh gene expression. A putative activator sensing the availability of substrate seems to respond to xanthine but not to hypoxanthine. The transcriptional start site of xdhA was mapped by primer extension analysis. Comparison with known promoter elements revealed no significant homology. Xanthine dehydrogenase from R. capsulatus was purified to homogeneity. The enzyme consists of two subunits with molecular masses of 85 kDa and 50 kDa respectively. N-terminal amino acid sequencing of both subunits confirmed the predicted start codons. The molecular mass of the native enzyme was determined to be 275 kDa, indicating an alpha2beta2-subunit structure. Analysis of the molybdenum cofactor of xanthine dehydrogenase from R. capsulatus revealed that it contains the molybdopterin cofactor and not a molybdopterin dinucleotide derivative.

Amino Acid Sequence↗

PubMed1998

Pharyngo-UES contractile reflex in patients with posterior laryngitis.

BACKGROUND: Earlier studies have shown that stimulation of the human pharynx by injection of minute amounts of water stimulates the pharyngo-UES contractile reflex. It has been suggested that this reflex may be activated during pharyngeal reflux of gastric and/or esophageal content, thus increasing the UES pressure and possibly preventing further entry of the refluxate into the pharynx. However, the integrity of this reflex in patients with posterior laryngitis has not been studied. AIM: Evaluate the pharyngo-UES contractile reflex in a group of patients with objective findings of posterior laryngitis. METHODS: Fourteen consecutive patients with posterior laryngitis (mean age, 48+/-6 y) and 13 healthy volunteers (mean age, 53+/-6 y) were studied by concurrent pharyngeal water stimulation and UES manometry. RESULTS: The threshold volume required to evoke the pharyngo-UES contractile reflex in the laryngitis group (0.4+/-0.05 mL) was significantly higher than that of the control (0.2+/-0.04 mL) (P < .05). Following stimulation of the pharyngo-UES contractile reflex, the maximum postinjection pressure in patients (75+/-6 mm Hg) was similar to that of the controls (78+/-6 mm Hg). The percent increase in UES pressure following stimulation of the reflex in the laryngitis group (99%+/-15%) was significantly higher than that of controls (55%+/-11%) (P < .05). CONCLUSIONS: Compared with normal controls, a significantly larger volume of liquid is required to trigger this reflex in patients with posterior laryngitis. When triggered, the maximum UES pressure induced by the pharyngo-UES contractile reflex is similar between the two groups. These findings suggest an altered afferent sensory limb of this reflex in patients with posterior laryngitis.

Adolescent↗

PubMed1998

Evidence for a regulatory link of nitrogen fixation and photosynthesis in Rhodobacter capsulatus via HvrA.

A Rhodobacter capsulatus reporter strain, carrying a constitutively expressed nifA gene and a nifH-lacZ gene fusion, was used for random transposon Tn5 mutagenesis to search for genes required for the NtrC-independent ammonium repression of NifA activity. A mutation in hvrA, which is known to be involved in low-light activation of the photosynthetic apparatus, released both ammonium and oxygen control of nifH expression in this reporter strain, demonstrating a regulatory link of nitrogen fixation and photosynthesis via HvrA. In addition, a significant increase in bacteriochlorophyll alpha (BChl alpha) content was found in cells under nitrogen-fixing conditions. HvrA was not involved in this up-regulation of BChl alpha. Instead, the presence of active nitrogenase seemed to be sufficient for this process, since no increase in BChl alpha content was observed in different nif mutants.

Bacterial Proteins↗

PubMed1998

Initial Clinical Experience of a Novel Device (the ÒFriend CatheterÓ) for Local Anesthetic Delivery Around Indwelling Arterial Sheaths.

The removal of femoral arterial sheaths, particularly after they have been in place for some hours, is a source of pain for patients undergoing invasiveive cardiac procedures. Methods of reducing this pain include systemic sedatives, analgesics and local anesthetic. We tested a new disposable plastic device, called the ÒFriend,Ó designed to reduce pain associated with sheath removal. The Friend wraps around a standard 8 Fr sheath allowing local anesthetic infiltration through side holes into local tissue. METHODS: Seventy-two patients undergoing interventional procedures were randomized to 3 groups for anesthetic administration just prior to sheath removal. Group 1 (control) received no local anesthetic. Group 2 (local) received 10 ml of lignocaine directly infiltrated with syringe and needle around the sheath. Group 3 (Friend) had the Friend inserted with the sheath and 10 ml of lignocaine was delivered via the device. Pain around the sheath was assessed prior to, during and just after, sheath removal using a 5 point verbal scale. RESULTS: Sixty-two patients completed the study. There were no serious complications related to the Friend device. The Friend group patients had significantly less pain associated with sheath removal than the control group. (Mean pain difference 1.28 vs. 0.34, p = 0.04). Pain scores in group 2 (local) did not differ significantly from the control group. The additional estimated cost involved in using the Friend was $16.93 per patient. CONCLUSIONS: The Friend device is a new, inexpensive and safe method of reducing pain associated with removal of arterial sheaths after cardiac interventional procedures.

Journal Article↗