Papaverine
Category impotence therapy description papaverine pa-pav-er-een ; belongs to the group of medicines called vasodilators.
Papaverine is useful in preventing vascular spasm.
Husband was with his blatant actions. We were headed for the same hell, the same punishment for sin. But, praise the Lord for His mercy! Romans 5: 8 says, "But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us." Before we were even born, He cried out from the Cross, "Father, forgive them; for they know not what they do" Luke 23: 34 ; . He who has little revelation of God's forgiveness extended to him personally will only be able to experience and express little love in return. Praise the Lord, I've been forgiven for so much! So many offensive attitudes in my heart have been pardoned. Jesus has very graciously not given me what I deserve and has very generously given me what I don't deserve. And because of that, I love Him much.
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Diaphoresis, flushing, dizziness, sinus tachycardia. Papaverine in large doses is a potent inhibitor of the cellular breathing and a slight calcium antagonist. The rise of dose over 15 g provokes metabolic acidosis with hyperventilation, hyperglycaemia and hypokalemia. Treatment: water lavage or activated charcoal, milk. There is not a specific antidote. The treatment is symptomatic: of blood pressure, the depression of breathing, to overcome coma. Haemodialysis could be of advantage. PHARMACEUTICAL FORM AND PACKAGE: 40 tablets of 50 mg in one package. STORAGE: In a dry place, at a temperature of 15-250 C.
Papaverine was administered to both acas in cases 1, 2, and 5 figure 1a, 1b, and 1e ; , into the left aca of case 3 figure 1c ; , and into the right aca of case 4 figure 1d mri changes appear only within the regions treated with papaverine and parnate.
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Inventions. And after this manner thou shalt speak unto them: Thus saith the Lord: If ye will not obey me, to walk in my laws, which I have given you, and to hear the words of my servants the prophets, whom I sent unto you, rising up timely, and still sending: If ye will not follow them I say ; then will I do to this house, as I did unto Siloh, and will make this city to be abhorred of all the people of the earth. And the priests, the prophets and all the people heard Jeremie preach these words, in the house of the Lord. Now when he had spoken out all the words, that the Lord had commanded him to preach unto all the people, then the priests, the prophets and all the people took hold upon him, and said: Thou shalt die. How darest thou be so bold, as to say in the name of the Lord: it shall happen to this house as it did unto Siloh? And this city shall be so waste, that no man shall dwell therin? And when all the people were gathered about Jeremie in the house of the Lord, the princes of Judah heard of this rumor and they came soon out of the kings Palace in to the house of the Lord, and sat them down before the new door of the Lord. Then spake the priests and the prophets unto the rulers and to all the people, these words: This man is worthy to die, for he hath preached against this city, as ye yourselves have heard with your ears. Then said Jeremie unto the rulers and to all the people: The Lord hath sent me to preach against this house and against this city all the words that ye have heard. Therefore amend your ways, and your advisements, and be obedient unto the voice of the Lord your God: so shall the Lord repent of the plague, that he had devised against you. Now as for me: I in your hands, do with me, as ye think expedient and good. But this.
Itself many women feel as though they have failed their child. Please take heart, it is not failure to do what is needed for your child. You can still bond with your child during feeding times. As with breastfeeding, skin-to-skin contact is extremely helpful with bonding. Remember, being a good parent means doing what is best for your child, while breastfeeding is `best' for most children, unfortunately that is not always the case. Always talk to your child's pediatrician and do your research! In many cases practical changes will enable you to make breastfeeding a success and paromomycin.
Drugs that are S-phase specific Fig. 3, I ; . These are agents whose sole or principal mechanism of action is in inhibiting DNA synthesis, which occurs in the S-phase of the cell cycle. Administration of drugs that can in hibit DNA synthesis, so timed as to provide maximum levels during the S-phase for all cells, can cause marked inhibition of growth of cells in culture and in animal tumors. Re cent evidence suggests that this may be true for some human tumors. Drugs that are S-phase specific, self limiting Fig. 3, II ; . Some agents are capable of inhibiting DNA synthesis; however, their breadth of action pro duces inhibition of RNA and protein synthesis also. These latter effects slow the cell cycle and prevent cells from entering the highly sensitive S phase. Thus, they are only relatively S-phase specific. Drugs that are cycle non-specific.
In: LeRoux P, Winn HR, Newell DW, eds. Management of Cerebral Aneurysms. Philadelphia: Elsevier Science, 2004: 489498. Elliott JP, Newell DW, Lam DJ, et al. Comparison of balloon angioplasty and papaverine infusion for the treatment of vasospasm following aneurysmal subarachnoid hemorrhage. J Neurosurg 1998; 88 2 ; : 277284. Kaku Y, Yonekawa Y, Tsukahara T, Kazekawa K. Superselective intra-arterial infusion of papaverine for the treatment of cerebral vasospasm after subarachnoid hemorrhage. J Neurosurg 1992; 77 6 ; : 842847. Katoh H, Shima K, Shimizu A, et al. Clinical evaluation of the effect of percutaneous transluminal angioplasty and intra-arterial papaverine infusion for the treatment of vasospasm following aneurysmal subarachnoid hemorrhage. Neurol Res 1999; 21 2 ; : 195203. Liu JK, Tenner MS, Oestreich HM, Couldwell WT. Reversal of radiographically impending stroke with multiple intraarterial papaverine infusions in severe diffuse cerebral vasospasm induced by subarachnoid hemorrhage. Acta Neurochir 2001; 143 12 ; : 12491255. Liu JK, Tenner MS, Gottfried ON, et al. Efficacy of multiple intraarterial papaverine infusions for improvement in cerebral circulation time in patients with recurrent cerebral vasospasm. J Neurosurg 2004; 100 3 ; : 414421. Newell DW, Eskridge JM, Mayberg MR, Grady MS, Winn HR. Angioplasty for the treatment of symptomatic vasospasm following subarachnoid hemorrhage. J Neurosurg 1989; 71: 654660. Polin RS, Hansen CA, German P, Chadduck JB, Kassell NF. Intraarterially administered papaverine for the treatment of symptomatic cerebral vasospasm. Neurosurgery 1998; 42 6 ; : 12561264. Sawada M, Hashimoto N, Tsukahara T, Nishi S, Kaku Y, Yoshimura S. Effectiveness of intra-arterially infused papaverine solutions of various concentrations for the treatment of cerebral vasospasm. Acta Neurochir 1997; 139 8 ; : 706711. Cross DT III, Moran CJ, Angtuaco EE, Milburn JM, Diringer MN, Dacey RG Jr. Intracranial pressure monitoring during intraarterial papaverine infusion for cerebral vasospasm. J Neuroradiol 1998; 19 7 ; : 13191323. Smith WS, Dowd CF, Johnston SC, et al. Neurotoxicity of intraarterial papaverine preserved with chlorobutanol used for the treatment of cerebral vasospasm after aneurysmal subarachnoid hemorrhage. Stroke 2004; 35 11 ; : 25182522. Heuer G, Smith MJ, Elliott JP, Winn HR, Le Roux P. The relationship between intracranial pressure and other clinical variables in patients with aneurysmal subarachnoid hemorrhage. J Neurosurgery 2004; 101: 408416. Gopinath SP, Robertson CS, Contant CF, et al. Jugular venous desaturation and outcome after head injury. J Neurol Neurosurg Psychiatry 1994; 57: 717723. Gracias VH, Guillamondegui OD, Stiefel MF, et al. Cerebral cortical oxygenation: a pilot study. J Trauma 2004; 56: 469474. Le Roux P, Lam AM, Newell DW, Grady MS, Winn HR. Cerebral arteriovenous difference of oxygen: a predictor of cerebral infarction and outcome in severe head injury. J Neurosurg 1997; 87: 18. van Santbrink H, van den Brink WA, Steyerberg EW, Carmona Suazo JA, Avezaat CJ, Maas AI. Brain tissue oxygen response in severe traumatic brain injury. Acta Neurochir Wien ; 2003; 145 6 ; : 429438. Bardt TF, Unterberg AW, Hartl R, Kiening KL, Schneider GH, Lanksch WR. Monitoring of brain tissue PO2 in traumatic brain injury: effect of cerebral hypoxia on outcome. Acta Neurochir Suppl 1998; 71: 153156. Johnston AJ, Steiner LA, Coles JP, et al. Effect of cerebral perfusion pressure augmentation on regional oxygenation and metabolism after head injury. Crit Care Med 2005; 33 1 ; : 189195. van den Brink WA, van Santbrink H, Steyerberg EW, et al. Brain oxygen tension in severe head injury. Neurosurgery 2000; 46 4 ; : 868876. 21 and pbz.
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Shifman and others 2002; discussed in Tunbridge, Harrison, and Weinberger 2006 ; . Thus, knowledge of the developmental profile of COMT activity is relevant to understanding the development of the normal PFC dopamine system, as well as its dysfunction in schizophrenia and other neurodevelopmental disorders. Studies of the postnatal expression profile of COMT are few Agathopolous and others 1971; Stanton and others 1975; Brust and others 2004; see Discussion ; , and none have been conducted in human brain. Thus, we sought to determine COMT activity and expression during postnatal maturation in the PFC of normal humans. We demonstrate a dramatic increase in PFC COMT activity across the human postnatal lifespan, which correlates with increases in COMT protein immunoreactivity determined by immunoblotting. Materials and Methods and pediatric.
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23. Ruiz de Oiia C, Morreale de Escobar G, Calve RM, Escobar de1 Rey F, Obreg6n MJ 1991 Thyroid hormone and 5'-deiodinase in the rat fetus late in gestation. Effects of maternal hypothyroidism. Endocrinology 128: 422-432 24. Caster WO, Poncelet J, Simon AB, Armstrong WD 1956 Tissue weights of the rat. I. Normal values determined by dissection and chemical methods. Proc Sot Exp Med Biol 91: 122-126 25. Barker JN 1966 Fetal and neonatal cerebral blood flow. J Physiol 210: 897-902 26. Mendel CM, Laughton CW, McMahon FA, Cavalieri RR 1991 Inability to detect an inhibitor of thyroxine-serum protein binding in sera from patients with non-thyroidal illness. Metabolism 40~491-502 27. Leonard JL, Rosenberg IN 1980 Iodothyronine 5'-deiodinase from rat kidney: substrate specificity and the 5' iodination of reverse triiodothyronine. Endocrinology 107: 1376-1383 28. Lowry OH, Rosebrough NJ, Farr AL, Randall RJ 1951 Protein measurement with the Folin phenol reagent. J Biol Chem 193: 265-275 29. Snedecor GW, Cochran WG 1980 Statistical Methods, ed 7. Iowa State University Press, Ames, IA 30. Escobar-Morreale HF, Escobar de1 Rey F, Obreg6n MJ, Morreale de Escobar G 1996 Only the combined treatment with thyroxine and triiodothyronine ensures euthyroidism in all tissues of the thyroidectomized rat. Endocrinology 1372490-2502 31. Calve RM, Obreg6n MJ, Ruiz de OHa C, Ferreiro B, Escobar de1 Rey F, Morreale de Escobar G 1990 Thyroid hormone economy in pregnant rats near term: a "physiological" animal model of non-thyroidal illness? Endocrinology 12710-16 32. Wartofski L, Burman KD 1982 Alterations in thyroid function in patients with systemic illness: the "euthyroid sick syndrome." Endocr Rev 3: 164-217 33. Tibaldi JM, Surks MI 1985 Animal models of non-thyroidal disease. Endocr Rev 687-101 34. Divino C, Schussler GC 1989 Binding of thyroxine-transthyretin complexes to specific cell surface receptors. Clin Res 37: 357A Abstract ; 35. SchrGder-van der Elst JP, Van der Heide D, Versloot 1994 Effects of EMD 21388 on the kinetics of T, and T, in the female rat. J Endocrinol Invest 17: 19 Abstract ; 36. Kaplan MM 1986 Regulatory influences on iodothyronine deiodination in animal tissues. In: Henneman G ed ; Thyroid Hormone Metabolism. Marcel Dekker, New York, pp 231-253 37. Berry MJ, Banu L, Larsen PR 1991 Type 1 iodothyronine deiodinase is a selenocysteine-containing enzyme. Nature 349: 438-440 38. KGhrle J, Hesch RD, Leonard JL 1991 Intracellular pathways of iodothyronine metabolism. In: Braverman LE, Utiger RD eds ; Werner and Ingbar's The Thyroid. JB Lippincott Co, Philadelphia, PA, pp 144-189 39. SchrBder-van der Elst JP, van der Heide D, Versloot PM, Chen T, Rokos H 1995 1251 flavonoid crosses the placenta and accumulates in the fetal compartment in the rat. XIth International Thyroid Congress, Toronto, Canada Abstract 248 ; 40. Thomas T, Southwell BR, Schreiber G, Jaworoski A 1990 Plasma protein synthesis and secretion in the visceral yolk sac of the rat: gene expression, protein synthesis and secretion. Placenta 11: 413-430 41. Contempre B, Jauniaux E, Calve R, Jurkovic D, Campbell S, Morreale de Escobar G 1993 Detection of thyroid hormone in human embryonic cavities during the first trimester of pregnancy. J Clin Endocrinol Metab 77: 17191722.
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Terminating paroxysmal supraventricular tachycardia. Circulation 6: 1254-1263 Dobson JG Jr 1978 ; Reduction by adenosine of the isoproterenolinduced increase in cyclic adenosine 3', 5'-monophosphate formation and glycogen phosphorylase activity in rat heart muscle. Circ Res 43: 785-792 Dobson JG Jr 1983a ; Interaction between adenosine and inotropic interventions in guinea pig atria. J Physiol 245: H475-H480 Dobson JG Jr 1983b ; Mechanism of adenosine inhibition of catecholamine-induced responses in heart. Circ Res 52: 151160 Endoh H, Honma M 1979 ; Effects of papaverine and its interaction with isoprenaline and carbachol on the contractile force and cyclic nucleotide levels of the canine ventricular myocardium. Naunyn Schmiedebergs Arch Pharmacol 306: 241-248 Endoh M, Yamashita S 1980 ; Adenosine antagonizes the positive inotropic action mediated via fi-, but not a-adrenoceptors in the rabbit papillary muscle. Eur J Pharmacol 65: 445-448 Evans DB, Schenden JA, Bristol JA 1982 ; Adenosine receptors mediating cardiac depression. Life Sci 31: 2425-2432 Gilman AG 1984 ; G Proteins and dual control of adenylate cyclase. Cell 36: 577-579 Grossman A, Furchgott RF 1964 ; The effects of various drugs on calcium exchange in the isolated guinea pig left auricle. J Pharmacol Exp Ther 145: 162-172 Hazeki O, Ui M 1981 ; Modification by islet-activating protein of receptor-mediated regulation of cyclic AMP accumulation in isolated rat heart cells. J Biol Chem 256: 2856-2862 Isenberg G 1977 ; Cardiac Purkinje fibers: The slow inward current component under the influence of modified [Ca2 * ]i. Pflugers Arch 371: 61-69 Jochem G, Nawrath H 1983 ; Adenosine activates a potassium conductance in guinea-pig atrial heart muscle. Experientia 39: 1347-1349 Kranias EG, Solaro RJ 1982 ; Phosphorylation of troponin I and phospholamban during catecholamine stimulation of rabbit heart. Nature 298: 182-184 Leung E, Johnston Cl, Woodcock EA 1983 ; Demonstration of specific receptors for adenosine in guinea pig myocardium. Clin Exp Pharmacol Physiol 10: 325-329 Levy NM 1971 ; Sympathetic-parasympathetic interactions in the heart. Circ Res 29: 437-445 Linden J, Brooker G 1979 ; The questionable role of cyclic guanosine 3': 5'-monophosphate in heart. Biochem Pharmacol 28: 3351-3360 Linden J, Vogel S, Sperelakis N 1982 ; Sensitivity of Ca-dependent slow action potentials to methacholine is induced by phosphodiesterase inhibitors in embryonic chick ventricles. J Pharmacol Exp Ther 222: 383-388 Linden J, Patel A, Sadek S 1985 ; [125I]Aminobenzyladenosine, a new radioligand with improved specific binding to adenosine receptors in heart. Circ Res 56: 279-284 Londos C, Wolff J 1977 ; Two distinct adenosine-sensitive sites on adenylate cyclase. Proc Natl Acad Sci USA 74: 5482-5486 Londos C, Cooper DMF, Schlegel W, Rodbell M 1978 ; Adenosine analogs inhibit adipocyte adenylate cyclase by a GTP-dependent process: Basis for actions of adenosine and methylxanthines on cyclic AMP production and lipolysis. Proc Natl Acad.
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Snap gauge assessment correlated with subjective reports of erectile capability r 0.92, p 0.001 ; . n 15 men and n 14 women rated the quality of coitus as very good to excellent compared to previous best since injury r 0.78 p 0.001 ; . At 3 months, 93% of the men and 83% of the women reported rigidity sufficient for vaginal penetration. At 6 months, 14 couples were regularly using device at least 1 wk. At 6 months, 41% of the men and 45% of the women were satisfied with the device. 60% of men and 42% of women indicated an improvement of the sexual relationship. Vacuum constriction device changed rigidity a median range of 57% range 30-80% ; . No difference between vacuum constriction device and papaverine. Patient subjective rating scale was significantly lower for minoxidil than vacuum constriction device or papaverine p 0.05 ; . Physicians subjective ratings were significantly lower for minoxidil than other treatments p 0.05.
Suka Pharmaceuticals, Tokyo, Japan ; , formoterol fumarate Yamanouchi Pharmaceuticals , Tokyo , Japan ; , tulobuterol hydrochloride Abbott Japan, Fukui, Japan ; , salmeterol Glaxo SmithKline, Hertfordshire, UK ; , propranolol hydrochloride Sigma , St Louis , MO, USA ; , leukotriene D4 Peptide Institute, Osaka, Japan ; , substance P Peptide Institute, Osaka, Japan ; , AF-DX 116 Tocris Cookson , Bristol , UK ; and papaverine hydrochloride Sigma, St Louis, MO, USA ; . Adrenaline and isoproterenol were dissolved in and diluted with a 0.9% NaCl solution saline ; containing 0.12 mM ascorbic acid. Stock solutions 20 mM ; of formoterol and salmeterol were dissolved in acetic acid and diluted with saline. Stock solutions 20 mM ; of AF-DX 116 were dissolved in 0.1 N-HCl solution and diluted with saline . All other drugs were dissolved in and diluted with saline. These solvents did not affect the responsiveness to carbachol or agonists. The molar concentrations of drugs in this paper refer to the final bath concentrations and pemetrexed.
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Renin during sodium depletion. However, the fact that PGI2 is synthesized by the afferent arteriole and is more potent in releasing renin than either PGD 2 Seymour et al., 1979 ; or PGE2 Gerber et al., 1979 ; favors a primary role for PGI2. There is the question of the site of action of the renal prostaglandins to increase renin release; do they act directly on the JG cells, on the vascular receptor in the renal afferent arteriole, or on both? Osborn et al. 1978 ; have suggested a direct action of PGE2 on the JG cells since other vasodilators, such as acetylcholine, bradykinin, and eledoisin, increased renal blood flow as much as infusion of PGE 2 but did not increase renin release. Similar results were obtained by Gerber et al. 1979 ; with intrarenal papaverine while studying the vasodilator action of PGI 2 and PGE2. Furthermore, Whorton et al. 1977 ; demonstrated that PGI2 increased renin release from renal cortical slices. Collectively, these observations point to an action at the JG cell level, but additional studies are needed to exclude an action of prostaglandins on the renal vascular receptor. One of the most striking hemodynamic changes that occurred in response to indomethacin was the fall in arterial pressure. In conscious sodium-depleted dogs, it has recently been demonstrated Stephens et al., 1978 ; that arterial pressure is sustained by increased total peripheral resistance in the presence of a fall in cardiac output. This occurs in association with an increase in PRA and the action of angiotensin II on the peripheral arterioles. In response to indomethacin, as PRA fell, arterial pressure also decreased; and, as the effect of indomethacin declined, both PRA and arterial pressure increased. A high correlation P 0.005 ; between PRA and mean arterial pressure was observed before and after indomethacin or meclofenamate administration from the data in Tables 4-6 ; . It appears, therefore, that arterial pressure fell as the support from the action of angiotensin II on the peripheral arterioles was decreased by the decline in PRA. The present findings are consistent with the observations of Oates and associates 1979 ; that indomethacin decreased PRA in sodium-depleted hypertensive patients during propranolol administration. However, in the present study, when angiotensin II formation was blocked in denervated, propranolol-treated, sodium-depleted dogs, PRA never fell below 12 ng of per hour in response to indomethacin. This level of PRA is 17 times normal and reflects the action of mechanisms other than the adrenergic nervous system and the renal prostaglandins. Also, these observations may indicate that the renal prostaglandins play a permissive role and modulate the control of renin release. In dogs with blockade of the adrenergic nervous system and indomethacin administration, both the renal vascular receptor mechanism and the macula densa might be operative to increase renin release. The.
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Figure 1. Growth of mouse embryonic stem cells mESCs ; in the presence and absence of 3D nanofibrillar surfaces Ultra-Web ; . A, B ; : Alkaline phosphatase staining of mESC colonies after 3 days of culture in the absence A ; and presence B ; of the 3D nanofibrillar surface Ultra-Web ; . Colonies were significantly larger for mESCs cultured on Ultra-Web than for mESCs cultured on plain coverslips. Scale bar 10 m. C ; Proliferation of mESCs was determined at 24-hour intervals for 3 days in the presence and absence of Ultra-Web, as described in Materials and Methods. The rate of proliferation was enhanced for cells cultured on Ultra-Web compared with cells cultured on glass. Data are shown as mean standard deviation n 3 and penicillamine.
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FIG. 1. Initial velocity of ACV influx as determined by oilstop and papaverine-stop transport assays. Human erythrocytes 10 pl packed cells ; were incubated in PBS for the indicated times a t M with 1.0 m [3H]ACV 3.4 mCi mmol ; in a total volume of 200 pl. Assays were terminated by the activation of the microcentrifuge after the addition of 100 pl of warmed 37 "C ; dibutyl phthalate to the assay mixture m ; or the addition of 200 pl of 3.0 m papaverine M 0 ; . the latter case, the papaverine-terminated assays were kept In at room temperature for 10 s before centrifugation in the presence of 200 p1 of dibutyl phthalate; longer delay times prior to activation of the microcentrifuge, defined as 10 s plus the additional time specified A, 0 ; , are shown dashed lines ; for assay times of 0 and 3 s, respectively. Each assay time point represents the mean f S.E. of triplicate assays. Error burs were omitted when they did not extend beyond the boundary of the respective symbol.
Minergic activities that lower the response threshold for erectile and ejaculatory reflexes 306 ; and, at least in rats, are mediated by the sacral parasympathetic and thoracolumbar sympathetic pathways 327 ; . Administration of apomorphine 0.25 to 1.0 mg sc ; in placebo-controlled studies was shown to induce erection in approximately 60% of men with psychogenic impotence 328 ; . Its effect on erectile function may be potentiated by visual sexual stimulation 329 ; . A new sublingual controlled absorption preparation of apomorphine at doses of 3 and 4 mg ; was shown to induce erection in about 65% of a small sample of 12 patients with erectile insufficiency not due to organic etiologies 330 ; . Bromocriptine, a dopamine receptor agonist, may offer another therapeutic modality for apomorphine-responsive men 331 ; . Naltrexone: Naltrexone ReVia, DuPont Pharmaceuticals Co., Wilmington, DE ; is a long-acting opiate antagonist. Naltrexone 2550 mg daily ; was reported to produce a full return of erectile function in six patients 332 ; . Further, in two other placebo-controlled studies, naltrexone 50 mg daily ; was shown to increase the frequency of morning erection and successful coital attempts 333 ; and to completely restore the erectile function in 20% of patients 334 ; . The combination of opioid receptor blockade with yohimbine may increase the rate of return of erectile function over that obtained with the use of opiate antagonists alone 335 ; . Fluoxetine: Fluoxetine Prozac, Dista Products Co., Indianapolis, IN ; is a highly selective serotonin reuptake inhibitor that produces sexual side effects in up to 16% of patients receiving the agent for treatment of depression 336 ; . However, case reports of priapism have been reported with the use of fluoxetine. Mechanisms proposed to explain the conflicting sexual stimulation and inhibition effects of fluoxetine and other SSRIs include selective blockade of 5-HT receptor subtypes, partial agonist antagonist neurotransmission, and or receptor down-regulation with subsequent activation of central serotonin release 306 ; . As a significant lengthening of the ejaculatory reflex is commonly seen with SSRIs, these agents are better suited for treatment of premature ejaculation see below ; . b. Local vasoactive agents. i. Intracavernous injections: Intracavernous injection therapy of male erectile dysfunction with vasoactive agents has recently been extensively reviewed 306, 322, 326, ; . The following is a brief summary of the pharmacological effects and the reported clinical experience with these agents also see Table 5 ; . Papaverine: Papaverine is an opium alkaloid without the clinically recognized narcotic effects. It has a direct relaxing effect on smooth muscle tone via the nonselective inhibition of cyclic nucleotide PDEs, which results in the accumulation of cAMP and cGMP 339 ; . It also blocks the voltage-dependent calcium channels, reduces calcium influx, and inhibits the release of intracellular calcium stores. These effects may directly relax the corporeal arterioles, sinusoids, and veins 322, 337 ; . Papaverine is acidic in solution may precipitate at pH 5 ; , slowly cleared from the corporeal tissue, has a plasma half-life of 12 h, and is metabolized by the liver 337 ; . Injections of papaverine alone produce a full erection in about 3557% of patients, depending on dose used and the and parnate.
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Fig. 1. Histograms displaying A ; mean SD ; mean arterial pressure MAP ; , B ; mean intracranial pressure ICP ; , and C ; brain tissue oxygen BtO2 ; at baseline and during infusion of intra-arterial papaverine IAP ; . Statistical significance p 0.05 ; is denoted by * . once IAP was ended. These results may help explain why papaverine, although successful in reversing the arterial narrowing of vasospasm, has not resulted in improved patient outcome 5, 9.
Response of heart transplant patients to intracoronary papaverine was reported previously.15 The coronary flow results in the transplant group in our study are in keeping with normal coronary flow reserve values reported previously.14'15 The heart transplant group in our study provides a "normal" control group. All the transplant patients had completely normal coronary arteries, and the normal response to papaverine seen in this study reflects this. The presence of even minor coronary occlusive disease causes an impairment in coronary flow reserve in orthotopic heart transplants.7 In the absence of an ideal control group of normal healthy volunteers, the transplant group in this study probably provides the best alternative comparison. It may be argued that hearts with normal innervation show basal a-mediated vasoconstrictor tone that limits coronary flow reserve and that, therefore, the heart transplant subjects are simply not true normal control subjects. However, the subject of resting adrenergic tone in humans is controversial. The presence or absence of resting adrenergic tone in the coronary vasculature has been the subject of much investigation. Conflicting results have been found by previous studies in unstressed conscious animals and humans. Whereas some studies demonstrated significant decreases in vascular resistance after a-blockade, '8-2' others were unable to demonstrate any change.22'23 Significant a-adrenergic coronary constrictor tone at rest has been suggested by studies in anesthetized24 and conscious dogs.25'26 In contrast, Chilian et al, 22 in well-controlled experiments, were unable to demonstrate any a-adrenergic coronary constrictor tone in conscious dogs. Some evidence for resting a-adrenergic coronary constrictor tone in humans was provided by the observation that normally innervated patients are characterized by a higher resting coronary resistance and a higher coronary arteriovenous oxygen difference than cardiac transplant patients, the difference being abolished by nonselective a-blockade with phentolamine.18 However, the conclusions of this study are based largely on the use of coronary sinus thermodilution, which is not suitable to detect small changes in coronary blood flow. The influence of the autonomic nervous system on coronary flow reserve has been investigated predominantly in the animal model.24'27 In contrast to these animal studies, Hodgson et aP28 recently demonstrated that significant neurally mediated a-vasoconstrictor tone is not present in resting, unstressed humans and that maximal vasodilator responses are not limited by the adrenergically mediated vasomotor tone. They studied 56 patients with denervated hearts after cardiac transplantation an average of 172 months [meanSD] from transplant to study ; and 19 normally innervated patients with angiographically normal coronary arteries. Coronary blood flow velocity was measured with a subselective intracoronary Doppler catheter, and coronary flow reserve was assessed by intracoronary papaverine. Regional a-blockade was produced by intracoronary injection of the nonselective a-blocker phentolamine. The mean coronary flow velocity decreased significantly in both groups of patients, but this was associated with a significant reduction in mean arterial pressure. However, there was no change in the calculated coronary vascular resistance, which takes the changes in arterial pressures into account.
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