Biomedical subjects

C H Lin

Publications and source records attributed to C H Lin.

At least 307 records · Page 17Linked to original sources

PubMed1993

Centrally acting serotonergic and dopaminergic agents. 1. Synthesis and structure-activity relationships of 2,3,3a,4,5,9b-hexahydro-1H-benz[e]indole derivatives.

The synthesis and structure-activity relationships (SAR) of 2,3,3a,4,5,9b-hexahydro-1H-benz[e]indole derivatives (3) are described. These compounds are conformationally restricted, angular tricyclic analogs of 2-aminotetralin. The synthesis was achieved in several steps from the corresponding 2-tetralones. The enantiomers of the cis analogs were obtained from either fractional recrystallizations of the diastereomeric salts of di-p-toluoyl-L-(or D)-tartaric acid or an asymmetric synthesis using chiral (R)-alpha-methylbenzylamine. All analogs were evaluated in the in vitro 5-HT1A and D2 binding assays and selected analogs were investigated further in biochemical and behavioral tests. Analogs with 9-methoxy substitution (R1 in 3) showed mixed 5-HT1A agonist and dopamine antagonist activities whereas the corresponding 9-hydroxy analogs displayed selective 5-HT1A agonist activity. The cis analogs were found to be more potent than the corresponding trans analogs and in the cis series, the (3aR)-(-)-enantiomers displayed higher potency. Nitrogen substitution (R2 in 3) with either an n-propyl or an allyl group produced similar activities whereas replacement with a bulky alpha-methylbenzyl group resulted in loss of activity. Analogs without aromatic substitution (R1 = H in 3) still showed good 5-HT1A agonist activity, although less potent than the 9-methoxy series. In this case, the trans analogs possessed equal or higher in vitro 5-HT1A affinity than the corresponding cis analogs. Analogs with either 6-methoxy or 6-hydroxy substitution (R1 in 3) were found to display dopamine antagonist properties. However, only N-allyl analogs showed this activity. In the 6-methoxy-N-allyl series, the cis analog was found to be more potent than the trans analog. Again, between the pair of cis enantiomers, the (3aR)-(-)-enantiomer showed higher potency. Incorporation of an additional methyl group into 9-methoxy cis analogs at C-2 resulted in retention of potent 5-HT1A agonist activity.

Animals↗

PubMed1993

Centrally acting serotonergic and dopaminergic agents. 2. Synthesis and structure-activity relationships of 2,3,3a,4,9,9a-hexahydro-1H-benz[f]indole derivatives.

The conformationally restricted linear tricyclic analogs of 5- and 8-hydroxy-2-(di-n-propylamino)-tetralins were investigated for their serotonergic and dopaminergic properties. These cis and trans analogs of 2,3,3a,4,9,9a-hexahydro-1H-benz[f]indole (3), where a five-membered ring is fused between the nitrogen and C-3 carbon of 2-aminotetralin, were synthesized from 5-methoxy- and 8-methoxytetralones. The enantiomers of trans-5-methoxy-N-n-propyl and -N-allyl analogs were obtained via fractional recrystallization of their di-p-toluoyl-L (or D) tartaric acid salts. All analogs were evaluated in the in vitro 5-HT1A and D2 binding assays and selected analogs were investigated further in biochemical and behavioral tests. In the 5-substituted series (R1 in 3), the trans isomers were found to possess higher levels of pharmacological activity then the corresponding cis isomers. The trans-5-methoxy analogs showed selective 5-HT1A receptor activity in vitro but displayed mixed 5-HT1A and D2 agonist properties in vivo. The corresponding trans-5-hydroxy analogs were found to be potent D2 agonists with full intrinsic activity. An examination of nitrogen substitution (R2 in 3) revealed that analogs with either an allyl or an n-propyl group displayed equipotent activities. Substitution with a cyclopropylmethyl or benzyl group resulted in reduced activity. Among the resolved analogs tested, the activity was found to reside exclusively in the (3aS)-(-)-enantiomers. In the 8-substituted series (R1 in 3), only 8-methoxy-N-allyl analogs were synthesized and evaluated. In this case, both cis and trans isomers showed equally weak in vitro 5-HT1A receptor agonist activity devoid of dopaminergic effects. The presence of an additional methyl group at the C-2 position (R3 in 3) of the cis-(+/-)-8-methoxy-N-n-propyl analog resulted in enhancement of in vitro 5-HT1A receptor binding affinity, with the (2 beta,3a alpha,9a alpha)-(+/-)-isomer displaying potency 35 times greater than the (2 alpha,3a alpha,9a alpha)-(+/-)-isomer.

Animals↗

PubMed1993

Centrally acting serotonergic agents. Synthesis and structure-activity relationships of C-1- or C-3-substituted derivatives of 8-hydroxy-2-(di-n-propylamino)tetralin.

The synthesis and structure-activity relationships (SAR) of C-1- or C-3-substituted derivatives of 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) are described. These analogs were synthesized via alkylation of the tetralone derivatives followed by reductive amination. All of the analogs were inactive at the dopamine D2 receptor. Among the 8-OMe or 8-OH C-1,N-disubstituted analogs synthesized, the cis analogs were more potent in the 5-HT1A binding assay than the corresponding trans analogs. However, in the case of 1-(cyclopropylmethyl)-N-n-propyl analogs, the trans isomer has a slightly higher 5-HT1A affinity than its cis counterpart. The order of binding potency for C-1 substitution was found to be allyl > hydroxymethyl > n-propyl > cyclopropylmethyl >> carbomethoxy. Interestingly, the 5-OMe analogs were found to be inactive in both the 5-HT1A and dopamine D2 binding assays. In the C-3 allyl-substituted analogs, 5-HT1A agonist activity was found to be considerably lower. In these examples, the trans analogs showed weak 5-HT1A binding activity whereas the cis analogs were inactive. Analogs with C-1,N,N-trisubstitution also showed a marked decrease in 5-HT1A binding affinity. Overall, the SAR study showed that cis C-1 substitution maintains the 5-HT1A agonist activity of 8-OH-DPAT whereas trans C-1 substitution displays somewhat diminished activity. On the other hand, the trans C-3 substitution shows modest agonist activity whereas cis C-3 substitution removes the activity completely.

8-Hydroxy-2-(di-n-propylamino)tetralin↗

PubMed1993

Suppression of a cellular differentiation program by phorbol esters coincides with inhibition of binding of a cell-specific transcription factor (NF-E2) to an enhancer element required for expression of an erythroid-specific gene.

Induction by hemin increases, while induction with 12-O-tetradecanoylphorbol-13-acetate (TPA) represses, erythroid-specific gene expression in the human cell line K562. We analyzed the effects of hemin or TPA induction on the binding and activity of transcription factors at a regulatory element found within the transcriptional regulatory sequences of many erythroid-specific genes. TPA induction increases the binding of ubiquitous AP-1 factors to this element. TPA induction inhibits the binding of the lineage limited transcription factor NF-E2 to this transcriptional control element. Hemin induction of K562 cells does not facilitate the binding of NF-E2 to its recognition site. Hemin induction appears to nonspecifically increase the expression of transiently transfected genes in K562 cells. Beyond this nonspecific increase in gene expression, hemin induction acts to increase the activity of the lineage limited transcription factor NF-E2. The divergent effects of hemin and TPA on gene expression in K562 cells are mediated, in part, by their contrasting effects on the transcription factor NF-E2.

Base Sequence↗

PubMed1993

Recombinant human transforming growth factor-beta 1: expression by Chinese hamster ovary cells, isolation, and characterization.

A partial cDNA clone encoding the gene for human transforming growth factor-beta 1 (TGF-beta 1) was isolated from a human bladder carcinoma cell line (5637) cDNA library. Following restriction enzyme processing and ligation of synthetic oligonucleotide linkers, the gene was inserted into a plasmid and transfected into Chinese hamster ovary cells. Clonal selection and growth conditions resulted in a method for production of recombinant human TGF-beta 1 at 7 mg/liter in conditioned cell medium. Through a combination of low pH treatment, cation-exchange chromatography, and salt precipitation, the recombinant human TGF-beta 1 was purified in milligram amounts to > 95% purity in a yield of about 36%. Purification to homogeneity was accomplished by chromatography on C18 silica gel. Amino acid analysis, N-terminal sequencing, and growth inhibition assays indicate identity with the molecule from human platelets.

Amino Acid Sequence↗

PubMed1993

Acute adaptation and resetting of the baroreflex control of vascular resistance in the canine hindquarters and mesentery.

To determine whether acute adaptation and resetting occur in the baroreflex control of regional vascular resistance, experiments were conducted in anesthetized and vagotomized dogs. The carotid sinuses were vascularly isolated to regulate the carotid sinus pressure (CSP) in an open-loop fashion. The hindquarters (n = 12) and mesenteric (n = 10) beds were perfused with constant flow and arterial perfusion pressures (HPP and MPP) were used to reflect changes in hindquarters and mesenteric resistance respectively. We first observed alterations in HPP and MPP during the course of CSP holding (conditioning pressure) at various levels for 15 min. Thereafter, the CSP was lowered to 50 mm Hg and increased stepwise to obtain the CSP-HPP and CSP-MPP baroreflex function curves. In experiments in the hindquarters bed, HPP stabilized at an average of 104.7 mm Hg during the initial conditioning pressure at 100 mm Hg. When conditioning pressure decreased to 50 mm Hg, the HPP increased to 125.5 mm Hg and then gradually declined to a steady level (115.6 mm Hg) in 5 min. An increase in conditioning pressure from 100 to 150 mm Hg caused HPP to decrease to 54.8 mm Hg followed by an upward adaptation to a steady level (80.2 mm Hg) in 5 min. The CSP/HPP curves constructed from the CSP step protocol were also affected by conditioning pressure. There were significant increases in the threshold and saturation pressures as conditioning pressure was elevated. However, the resetting was characterized by a parallel shift of the CSP/HPP curves without significant changes in baroreflex gain or sensitivity.(ABSTRACT TRUNCATED AT 250 WORDS)

Adaptation, Physiological↗

PubMed1993

External ear canal schwannoma: an unusual case report.

To the best of our knowledge, this is the first report of external ear canal schwannoma in the English literature. Several detailed clinical and pathological features were demonstrated. We suggest that if a tender, encapsulated mass is found in the external ear canal, the diagnosis of schwannoma should be taken into consideration.

Ear Canal↗

PubMed1993

Cytoskeletal remodeling during growth cone-target interactions.

Reorganization of the cytoskeleton of neuronal growth cones in response to environmental cues underlies the process of axonal guidance. Most previous studies addressing cytoskeletal changes during growth cone pathfinding have focused on the dynamics of a single cytoskeletal component. We report here an investigation of homophilic growth cone-target interactions between Aplysia bag cell neurons using digitally enhanced video microscopy, which addresses dynamic interactions between actin filaments and microtubules. After physical contact of a growth cone with a physiological target, mechanical coupling occurred after a delay; and then the growth cone exerted forces on and displaced the target object. Subsequent to coupling, F-actin accumulation was observed at the target contact zone, followed by preferential microtubule extension to the same site. After successful target interactions, growth cones typically moved off highly adhesive poly-L-lysine substrates into native target cell surfaces. These events were associated with modulation of both the direction and rate of neurite outgrowth: growth cone migration was typically reoriented to a trajectory along the target interaction axis and rates of advance increased by about one order of magnitude. Directed microtubule movements toward the contact site appeared to be F-actin dependent as target site-specific microtubule extension and bundling could be reversibly randomized by micromolar levels of cytochalasin B in a characteristic manner. Our results suggest that target contacts can induce focal F-actin assembly and reorganization which, in turn, guides target site-directed microtubule redistribution.

Actins↗

PubMed1993

Effects of anti-transforming growth factor-beta antibody and interleukin-2 in tumor-bearing mice.

In previous studies we found that the immunosuppression seen in mice bearing Herpes virus type 2-transformed (H238) fibrosarcoma was likely to be due to tumor-derived transforming growth factor-beta (TGF-beta). In vitro experiments showed that interleukin-2 (IL-2) and antibodies against TGF-beta could significantly counteract TGF-beta-induced depression in lymphocytes. The present study was performed to determine if the administration of polyclonal anti-TGF-beta antibody and recombinant IL-2, alone or in combination, could inhibit H238 tumor progression in vivo and to investigate possible mechanisms of action. The tumor cells were injected s.c. at 1 x 10(6) cells/mouse and treatments were given 1-10 days post-injection. In phase I, a total of 25,000 units of IL-2 (5,000 units/injection) and/or 900 ng of anti-TGF-beta (100 ng/injection) were administered i.p. per animal. Phase II was conducted similarly, except that each mouse received a total of 127,500 units of IL-2, either with or without the same amount of antibody. No treatment-related toxicity was noted. Tumor volumes were monitored for 16-18 days after tumor implantation. The H238 tumors in treated mice from both both phases grew as rapidly as, or significantly faster than, in untreated controls. Significant enhancement of tumor growth was found in the groups given IL-2 as a single agent, regardless of total dose. The combination of the higher IL-2 dose with anti-TGF-beta resulted in more rapid tumor progression than in animals given the antibody alone. Relative spleen weights, peripheral blood leukocyte counts, and the chemiluminescent oxidative burst of phagocytes were significantly elevated in all tumor-bearing mice, whereas T cell response to mitogenic stimulation was depressed. However, the oxidative burst capacity of spleen (but not blood) cells and natural killer cell cytotoxicity were markedly lower in the treated groups compared to nontreated tumor-bearing controls. In contrast, plasma levels of tumor necrosis factor-alpha and IL-2 were substantially higher in the group given both modalities (phase II) compared to the other treated groups. These findings show that anti-TGF-beta antibody, both with and without low-dose IL-2 regimens, can be safely administered in vivo. However, tumor growth was not delayed by the treatment protocols used. The induction of hyporesponsiveness in certain cell types may account, at least partly, for the enhancement seen in tumor progression.

Animals↗

PubMed1993

Studies of topical carbonic anhydrase inhibitors: ocular hypotensive effect of thiadiazole derivatives.

A series of thiadiazole derivatives were topically applied in gels or suspensions to rabbits to determine their ocular hypotensive effect. As a result, the compounds with higher corneal permeabilities showed stronger effect in lowering IOP. In addition, gels also caused stronger effect than suspensions. Different concentrations of gel preparations produced diverse ocular hypotensive effects. A linear relationship between the integrated IOP response and logarithm concentration of inhibitor was found. It is proposed that the ocular hypotensive effect was attributed to the level of inhibitor in ciliary body.

Administration, Topical↗

PubMed1993

Triflavin, an Arg-Gly-Asp-containing peptide, inhibits tumor cell-induced platelet aggregation.

In this study, we examined the effect of triflavin, an Arg-Gly-Asp (RGD)-containing snake venom peptide, on human cervical carcinoma (HeLa) cell- and B16-F10 mouse melanoma cell-induced platelet aggregation (TCIPA) in heparinized platelet-rich plasma. TCIPA appears to play an important role in the development of certain experimental tumor metastases. Two ADP-scavenging agents, apyrase (10 U/ml) and creatine phosphate (CP) (5 mM)/creatine phosphokinase (CPK) (5 U/ml) completely inhibited B16-F10 TCIPA, but hirudin (5 U/ml) had no effect. In contrast, apyrase and CP/CPK did not inhibit HeLa TCIPA while hirudin completely inhibited it. Furthermore, HeLa cells initially induced platelet aggregation and then blood coagulation at a later stage. In addition, HeLa cells shortened, in a concentration-dependent manner, the recalcification time of normal as well as factor VIII- and IX-deficient human plasma, but did not affect the recalcification time of factor VII-deficient plasma. This suggests that HeLa TCIPA occurs via activation of the extrinsic pathway, probably owing to tumor cell expression of tissue factor-like activity. HeLa cell-induced thrombin generation was confirmed by detection of amidolytic activity towards a chromogenic substrate, S-2238 (H-D-Phe-Pip-Arg-p-NA). Triflavin and GRGDS inhibited, in a dose-dependent manner, TCIPA caused by either cell line. On a molar basis, triflavin was 10,000-30,000 times more potent than GRGDS in this regard. Moreover, monoclonal antibodies raised against glycoprotein (GP) IIb/IIIa complex (i.e., 7E3 and AP2) and against GP Ib (i.e., AP1) completely inhibited HeLa TCIPA. 7E3 and AP2 inhibited B16-F10 TCIPA by up to 80% whereas AP1 showed only 30% inhibition of B16-F10 TCIPA. In conclusion, the inhibitory effect of triflavin on HeLa and B16-F10 TCIPA may be mediated principally by the binding of triflavin to the fibrinogen receptor associated with GP IIb/IIIa complex on the platelet surface. However, GP Ib is also involved in HeLa TCIPA as thrombin formation is the key factor in triggering platelet aggregation caused by HeLa cells.

Animals↗

PubMed1993

A prospective randomized study with mineral oil and oral lavage solution for treatment of faecal impaction in children.

Faecal impaction with or without encopresis is a very common problem. We performed a randomized, open-label, prospective study to compare the efficacy and acceptability of the treatment of faecal impaction using either mineral oil or pineapple-flavoured isotonic intestinal lavage solution containing polyethylene glycol-3350 (Colyte). Thirty-six patients over 2 years of age were randomized to receive either mineral oil or flavoured lavage solution. The dose of mineral oil was 2 to 8 tablespoons twice a day for two days (17 patients--Group I) and of lavage solution was 20 ml/kg/h for 4 hours on two consecutive days (19 patients--Group II). The patients were assessed for the presence of abdominal faecal masses, presence and consistency of rectal mass, perineal soiling before and two days after either of the randomly assigned treatment. The patients and parents were asked regarding the compliance with treatment, side-effects, number of bowel movements after treatment and willingness to try similar treatment if faecal impaction recurred. Patients in the lavage group had more frequent bowel movements, and showed more effective clearance of abdominal and rectal lumps (P < 0.01) at the time of repeat examination at two days. However, they had some vomiting and were less compliant (P < 0.01) when compared to mineral oil patients. We conclude that balanced lavage solution effectively relieves faecal impaction, however, compliance with its use is poorer than that with mineral oil.

Administration, Oral↗

PubMed1993

Pharmacological and pathological studies on Taiwan folk medicine (IX): The hepatoprotective effect of the methanolic extract from echinops grijisii.

In order to isolate the main hepatoprotective component of Echinops grijisii, the crude drug was extracted with methanol and subjected to continuous extractions using n-hexane chloroform, ethyl acetate and n-butanol. The hepatoprotective studies of each fraction from the methanol extract of E. grijisii was conducted in Wistar albino rats with CC(1)4-induced liver damage. Hepatoprotective activity was evaluated in terms of the modification of serum transaminase values such as SGOT and SGPT, and histopathological changes of liver biopsy. The results indicated that the main hepatoprotective component was concentrated in n-butanol and aqueous fractions.

1-Butanol↗

PubMed1993

The peptide FMRFa terminates a discharge in Aplysia bag cell neurons by modulating calcium, potassium, and chloride conductances.

1. Electrical stimulation of an afferent nerve triggers a 30-min period of firing of action potentials in the bag cell neurons of Aplysia californica. This afterdischarge causes the animal to undergo a long-lasting sequence of stereotyped reproductive behaviors culminating in laying of eggs. The connective sheath surrounding the clusters of bag cell neurons is interspersed with a network of particles that are immunoreactive to an antiserum raised against the tetrapeptide neurotransmitter Phe-Met-Arg-Phe-amide (FMRFa). Because the sheath is known to be rich in processes from the bag cell neurons, these data suggest that an FMRFa-like peptide may be located in neuronal processes that are in close contact with those of the bag cell neurons. 2. Application of FMRFa to bag cell neurons in intact abdominal ganglia effectively suppresses the onset of the afterdischarge in response to electrical stimulation and terminates an ongoing afterdischarge in a reversible manner. 3. Application of FMRFa to isolated bag cell neurons in primary cell culture causes an attenuation of the amplitude of evoked action potentials. This could be attributed in part to an attenuation of the voltage-activated calcium current, which in voltage-clamp experiments was found to be reduced by 10-40%. 4. Application of FMRFa to bag cell neuron in primary culture also causes a hyperpolarization of the membrane potential by activating an outward current with a reversal potential of approximately -67 mV. Ion substitution experiments, together with application of channel blockers, indicate that this current is carried by both potassium and chloride ions. Activation of this current is suppressed by treatment of the cells with either a cyclic AMP analogue or a phorbol ester activator of protein kinase C. 5. FMRFa exerts a powerful inhibitory influence on the bag cell neurons by altering the properties of ion currents involved in both the generation of action potentials and control of the resting potential. This suggests that this neuropeptide plays a role in the regulation of the onset of afterdischarge in vivo.

Animals↗

PubMed1993

Congenital syphilis: clinical manifestations in premature infants.

During the 4-year period February 1989 to January 1993, 13 premature babies aged 1-21 days and with congenital syphilis were admitted to the National Cheng Kung University Hospital. Of the 13 premature infants, 8 (62%) had unusual desquamation over palms and soles. Bone changes with periosteal reaction and/or metaphyseal dystrophy were observed in 11 cases (85%). Three mothers were diagnosed as being infected during pregnancy; 2 were treated with penicillin. The clinical features of congenital syphilis in premature neonates are somewhat different from those previously reported. Bone changes, hepatosplenomegaly, respiratory distress, skin lesions, especially over the soles and palms, cerebrospinal fluid abnormalities, and jaundice were the major manifestations in our series. In premature infants with these symptoms and signs, congenital syphilis should be considered as one of the differential diagnoses. Once the diagnosis of congenital syphilis is made, adequate penicillin therapy should be given.

Female↗

PubMed1993

Maple syrup urine disease: report of two cases.

Two cases of maple syrup urine disease (MSUD) are reported. Case 1 was a 10-day-old male infant who had cyanotic episodes and recurrent generalized convulsions; the odor of burned sugar from the body and urine was also noted. Plasma and urine amino acid analysis disclosed a marked increase in the concentration of branched chain amino acids (BCAA). As a result of a BCAA-free diet and mega-doses of thiamine, the condition stabilized. However, the patient was lost to follow-up and expired at two months of age due to inadequate management. Case 2 was a 20-day-old female infant with poor feeding, vomiting for one week, generalized convulsions and a peculiar burned sugar smell from the body and urine. Based on our experience with the first case, MSUD was suspected, and the infant was treated accordingly. However, subsequent follow-up revealed delayed developmental milestones. We present the first two reported cases of MSUD in Taiwan and review the relevant literature.

Amino Acids, Branched-Chain↗

PubMed1993

Bacterial meningitis in infants and children in southern Taiwan: emphasis on Haemophilus influenzae type B infection.

During a four-year period from November 1988 to October 1992, 41 cases of bacterial meningitis with a positive cerebrospinal fluid (CSF) culture and/or CSF antigen test were collected at the National Cheng Kung University Hospital. The ages of the subjects ranged from 32 days to 13 years, with a median of seven months. The male to female ratio was 2.4:1. The most common causative agent was Haemophilus influenzae type b (Hib, 29.3%), followed by group B beta-hemolytic streptococci (GBS, 24.4%), Streptococcus pneumoniae (22.0%), Escherichia coli (4.9%), Neisseria meningitidis (4.9%), Salmonella species (4.9%), Klebsiella pneumoniae (4.9%), Pseudomonas aeruginosa (2.6%), and viridans streptococci (2.6%). The onset of GBS meningitis was always prior to four months of age. Of the 41 cases studied, 27 (65.9%) were aged from two months to five years; 12 (44.4%) of these had meningitis caused by Hib. Most of the cases (90.2%) had a fever as the first clinical manifestation. Ampicillin combined with a third-generation cephalosporin was effective against most of the causative pathogens. The most frequently encountered short-term sequelae were seizures (64.7%), subdural effusion (55.9%) and ventriculomegaly (44.1%). Observations on long-term sequelae are ongoing. While the case-fatality rate was as high as 33.3% in S. pneumoniae, and 25% in Hib-infected patients, the overall mortality rate was 17.1%. There is a need for greater emphasis on prevention through the use of available vaccines, including the newly introduced conjugate vaccines against Hib which are capable of eliciting immune responses in infants as young as two months.

Adolescent↗

PubMed1993

The influence of position and PEEP on arterial blood gas during operation.

From December, 1990 to December, 1991, we studied the influence of PEEP and positional change to arterial blood gas in 60 ASA class II or III, aged 20 to 65 years, non-obese patients. The patients were assigned randomly into six groups. Group 1: head down position without PEEP. Group 2: head down position with PEEP 5 cmH2O. Group 3: lithotomy position without PEEP. Group 4: lithotomy position with PEEP 5 cmH2O. Group 5: supine position without PEEP. Group 6: supine position with PEEP 5 cmH2O. Blood gas analysis were performed at 5, 15, 30, 60, 120, and 180 minutes after positional change in group 1-4 and after anesthesia in group 5 and 6. The ventilator settings were: tidal volume -10 ml x 25 x (height in meters)2, rate 8/min. The results of significant difference inter-grouply were: PaO2 at 15 minutes; PaCO2 at 5 minutes; pH at 60, 120, and 180 minutes; base excess (BE) at 120 and 180 minutes. As the time progressed, PaO2 decreased in group 1, 2, and 3; PaCO2 decreased in group 3 and 5; pH decreased in group 3; BE decreased in all groups. PaCO2 were between 30-40 mmHg and no hypocarbia produced in all groups. In conclusion, ventilation of the non-obese patient based on 10 ml x 25 x (height in meters)2 x 8/min produce normocarbia and PaO2 more than 80 mmHg with 50% oxygen. No significant difference of PaO2 were found whether there were position change or PEEP 5 cmH2O.

Adult↗