Dexmedetomidine: an alternative for epidural anesthesia in tension-free vaginal-tape surgery.

PURPOSE: Anesthetic management of tension-free vaginal-tape (TVT) procedures is sometimes difficult to deal with, especially when surgeons request a cough test. Dexmedetomidine has unique sedative and analgesic properties while having minimal respiratory effects, making it suitable for perioperative use in monitored anesthesia care. We aimed to compare dexmedetomidine and epidural anesthesia in TVT patients. METHODS: Forty-nine women [American Society of Anesthesiologists (ASA 1-3)] with genuine stress incontinence confirmed by preoperative bladder function studies were included in this double-blind, randomized study. The patients were randomly assigned to one of two groups: group D received 0.5 µg/kg dexmedetomidine IV applied as bolus over 10 min and continued with 0.5 µg/kg/h infusion, and local anesthesia (lidocaine 2% with epinephrine) performed by the surgeon. Group E received epidural anesthesia with 15 ml of 0.25% bupivacaine + 100 µg fentanyl. Patients were monitored every 5 min for mean arterial pressure (MAP), heart rate (HR), peripheral oxygen saturation, respiratory rate, sedation, and intraoperative and postoperative pain. Ability to cough was also evaluated by the surgeon. RESULTS: There was no difference in ability to cough, and this was evaluated by the surgeon as adequate, and there was no difference in scores between groups. Significant decreases in MAP and HR were observed 10 min after the start of surgery in group D compared with group E, and they were significantly decreased until first and second postoperative hours, respectively (p < 0.05). None of the patients had respiratory rate decrease or apnea. Side effects encountered postoperatively were similar. CONCLUSION: Dexmedetomidine can be an alternative to epidural anesthesia in TVT procedure requiring cough test.

Spinal 5-HT7 receptors play an important role in the antinociceptive and antihyperalgesic effects of tramadol and its metabolite, O-Desmethyltramadol, via activation of descending serotonergic pathways.

BACKGROUND: Tramadol is an analgesic drug, and its mechanism of action is believed to be mediated by the mu-opioid receptor. A further action of tramadol has been identified as blocking the reuptake of serotonin (5-HT). One of the most recently identified subtypes of 5-HT receptor is the 5-HT7 receptor. Thus, the authors aimed to examine the potential role of serotonergic descending bulbospinal pathways and spinal 5-HT7 receptors compared with that of the 5-HT2A and 5-HT3 receptors in the antinociceptive and antihyperalgesic effects of tramadol and its major active metabolite O-desmethyltramadol (M1) on phasic and postoperative pain models. METHODS: Nociception was assessed by the radiant heat tail-flick and plantar incision test in male Balb-C mice (25-30 g). The serotonergic pathways were lesioned with an intrathecal injection of 5,7-dihydroxytryptamine. The selective 5-HT7, 5-HT2, and 5-HT3 antagonists; SB-269970 and SB-258719; ketanserin and ondansetron were given intrathecally. RESULTS: Systemically administered tramadol and M1 produced antinociceptive and antihyperalgesic effects. The antinociceptive effects of both tramadol and M1 were significantly diminished in 5-HT-lesioned mice. Intrathecal injection of SB-269970 (10 microg) and SB-258719 (20 microg) blocked both tramadol- and M1-induced antinociceptive and antihyperalgesic effects. Ketanserin (20 mumicrog) and ondansetron (20 microg) were unable to reverse the antinociceptive and antihyperalgesic effects of tramadol and M1. CONCLUSIONS: These findings suggest that the descending serotonergic pathways and spinal 5-HT7 receptors play a crucial role in the antinociceptive and antihyperalgesic effects of tramadol and M1.

Efficacy of different concentrations of sevoflurane administered through a face mask for magnetic resonance imaging in children.

BACKGROUND: The main aim of this study was to use a non-invasive method such as a face mask to maintain anesthesia in children during magnetic resonance imaging (MRI). The secondary aim was to ascertain hemodynamic-respiration parameters, recovery time and complications of anesthesia with the administration of different concentrations of sevoflurane. METHODS: This prospective and randomized study included 96 ASA I-II children, aged 1-10, scheduled to undergo MRI with anesthesia with sevoflurane through a face mask. All patients were administered midazolam 0.5 mg·kg(-1) orally 30 min before anesthesia induction. Sevoflurane 8% was given to induce anesthesia under assisted-controlled ventilation for 2 min, and an intravenous route was opened on the hand. Three different concentrations of sevoflurane were administered through a face mask under spontaneous respiration to maintain anesthesia. A mixture of sevoflurane, oxygen, and air of 5 l·min(-1) was given through a face mask for anesthesia. Group 1 (n = 32) received 1.5% sevoflurane, Group 2 (n = 32) 1.25% sevoflurane, and Group 3 (n = 32) 1.0% sevoflurane. Recovery time, removal from the MRI room, postanesthesia care unit discharge data, and complications were also recorded. Heart rate, mean arterial pressure (MAP), peripheral oxygen saturation (SpO(2)), respiration rate, and anesthesia adequacy were recorded every 5 min from the time of induction until completion of the MRI. RESULTS: All three groups were similar in demographic and hemodynamic respiratory features. MRI was successfully performed in 96.6% of all patients without additional intervention. Sevoflurane concentrations were increased for a short time in one patient in Group 1 and in two patients in Group 3. Oxygen flow was increased in one patient in Group 1 and in one patient in Group 2 as SpO(2) was lower than 95%. The mean time to eye opening (from discontinuation of sevoflurane to eye opening) was 155.8 ± 50.0 s in Group 1, 89.5 ± 16.0 s in Group 2, and 53.5 ± 10.0 s in Group 3; differences between the groups were statistically significant (P = 0.001). Airways were not used on any of the patients, and none vomited or required endotracheal intubation or laryngeal mask anesthesia. CONCLUSIONS: We believe that the administration of sevoflurane at a concentration of 1% via a face mask under spontaneous respiration may provide light anesthesia without complications to induce an unarousable sleep for children during MRI.

Proanthocyanidin protects intestine and remote organs against mesenteric ischemia/reperfusion injury.

BACKGROUND: Intestinal ischemia/reperfusion (IR) induces a systemic inflammatory response and releases harmful substances that may affect the function and integrity of distant organs such as lung, liver, and kidney. We conducted this study to find out if proanthocyanidins (PA) has protective effects against mesenteric IR injury and mesenteric IR-induced intestinal and distant organ injury. MATERIALS AND METHODS: Thirty-two Sprague-Dawley rats were divided into four groups: control, control + PA, IR, IR + PA. The IR and IR + PA groups were subjected to mesenteric arterial ischemia for 60 min and reperfusion for 6 h. The Control + PA and IR + PA groups were administered PA (100 mg/kg/day via oral gavage) for 7 days prior to injury insult. We collected ileal and distant organ tissues, such as pulmonary, hepatic, and kidney specimens to measure tissue levels of malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GPx), and nitrite plus nitrate (NO(x)), and we then evaluated histological changes. RESULTS: In the IR group, significant increases in MDA and NO(x) levels and significant increases in SOD and GPx activities of intestine, liver, kidney, and lung were observed. The MDA and NO(x) levels were significantly lower, as were the SOD and GPx activities in the IR + PA group than that in the IR group. Although the intestine and distant organs damage scores were significantly higher in the IR group, these injuries were prevented by PA in the IR + PA group. CONCLUSIONS: This study demonstrates that PA has a significant effect in the protection of the intestine and the remote organs against mesenteric IR injury.

A comparison of gabapentin and ketamine in acute and chronic pain after hysterectomy.

BACKGROUND: Gabapentin and ketamine are popular analgesic adjuvants for improving perioperative pain management. We designed this double-blind, placebo-controlled study to test and compare the preventive effects of perioperative ketamine and gabapentin on early and chronic pain after elective hysterectomy. METHODS: Sixty patients undergoing abdominal hysterectomy were randomly assigned to 1 of the following 3 groups: control group received oral placebo capsules and bolus plus infusion of saline; ketamine group received oral placebo capsules and, before incision, 0.3 mg/kg IV bolus and 0.05 mgxkg(-1)xh(-1) infusion of ketamine until the end of surgery; and gabapentin group received oral gabapentin 1.2 g and bolus plus infusion of saline. The anesthetic technique was standardized, and the postoperative assessments included verbal rating scales for pain and sedation, IV morphine usage, quality of recovery assessment, recovery of bowel function, resumption of normal activities, and patient satisfaction with their pain management. Patients were questioned at 1, 3, and 6 mo after surgery for chronic postoperative pain. RESULTS: Postoperative pain scores were significantly lower in the gabapentin group compared with the ketamine and control groups, and patient-controlled analgesia morphine use was significantly reduced in both treatment groups (versus control group) (P < 0.001). Total patient-controlled analgesia morphine use was decreased by 35% and 42% in the ketamine and gabapentin groups, respectively, compared with the control group (P < 0.001). Patient satisfaction with pain treatment was significantly improved in the ketamine and gabapentin groups compared with the control group (P < 0.001). The incidence of incisional pain and related pain scores at the 1-, 3-, and 6-mo follow-up were significantly lower in the gabapentin group compared with the ketamine and control groups (P < 0.001). CONCLUSION: Gabapentin and ketamine are similar in improving early pain control and in decreasing opioid consumption; however, gabapentin also prevented chronic pain in the first 6 postoperative months.

The effects of gabapentin on acute and chronic pain after inguinal herniorrhaphy.

BACKGROUND AND OBJECTIVE: To find out whether preoperative gabapentin use had a favourable effect on long-term postoperative pain in patients undergoing inguinal herniorrhaphy. METHODS: Sixty male patients--aged 20-40 years--who were scheduled for unilateral inguinal herniorrhaphy under spinal anaesthesia were included in this prospective, randomized, double-blind study. The patients were randomly allocated to two groups: the gabapentin group (n=30) received single-dose 1.2 g oral gabapentin 1 h before surgery, and the placebo group received a placebo capsule instead. Spinal anaesthesia was performed with heavy bupivacaine, and all operations were performed by the same surgeon with the same technique. Postoperative analgesia was evaluated during sitting and lying with a visual analogue scale. Assessment of postoperative pain at 1, 3 and 6 months was carried out with an 11-point numerical rating scale; 0 indicating 'no pain' and 10 indicating 'worst pain imaginable'. Patients who had numerical rating scale scores of more than 0 were further evaluated with regard to the impact of pain on their daily activities. RESULTS: When compared with the placebo group, the gabapentin group displayed significantly lower visual analogue scale scores (lying and sitting) and total tramadol consumption at 8, 12, 16, 20 and 24 h after surgery (P<0.05) and higher postoperative patient satisfaction scores (P<0.05). Numerical rating scale scores at 1, 3 and 6 months after surgery were lower in the gabapentin group than in the placebo group (P<0.05). The number of patients whose daily activities were adversely affected by pain was smaller in the gabapentin group at the first month; however, the two groups were found to be similar at 3 and 6 months. CONCLUSION: We conclude that preoperative single-dose gabapentin decreases the intensity of acute postoperative pain, tramadol consumption and the incidence and intensity of pain in the first 6 months after inguinal herniorrhaphy.

The concentration-dependent contractile effect of methylene blue in the human internal mammary artery: a quantitative approach to its use in the vasoplegic syndrome.

OBJECTIVE: To quantitate the contractile effect of methylene blue on isolated human internal mammary artery (IMA) as used in the vasoplegic syndrome. DESIGN: An in vitro experimental study. SETTING: Cardiovascular Pharmacology Laboratory, Department of Medical Pharmacology. PARTICIPANTS: IMA segments were used from 24 patients undergoing coronary artery bypass surgery. INTERVENTIONS: The responses to methylene blue, norepinephrine, and acetylcholine were recorded isometrically by a force-displacement transducer in an isolated organ bath. MEASUREMENT AND MAIN RESULTS: Methylene blue (10 nmol/L-100 micromol/L) produced concentration-dependent contraction in the arteries. The maximal contraction to methylene blue was 44.2% +/- 3.8% of KCl (68 mmol/L) maximum contraction; the pEC(50) (-log(10) of 50% effective concentration) value was 5.5 +/- 0.1. Methylene blue caused an insignificant leftward shift of the concentration-response curve of norepinephrine. Acetylcholine-induced relaxation in submaximal contracted rings with phenylephrine recovered nearly 6 hours after the methylene blue challenge. CONCLUSION: Methylene blue caused concentration-dependent contraction in human IMAs. Furthermore, the inhibition of ACh-induced relaxation for 6 hours after the methylene blue challenge points out an additional mechanism (ie, receptor occupation). The concentration-dependent contractile effect of methylene blue justifies its use in the vasoplegic syndrome. The findings also suggest that the time course of contraction is longer than the exposure to methylene blue.

Ameliorative effects of proanthocyanidin on renal ischemia/reperfusion injury.

INTRODUCTION: Several natural products have been reported to have beneficial effects on ischemia/reperfusion (I/R) injury, particularly from a preventative perspective. Therefore, this study was designed to investigate the efficiency of proanthocyanidin (PA), a natural product derived from grape seed, on renal dysfunction and injury induced by I/R of rat kidney. MATERIALS AND METHODS: Twenty-four male Sprague-Dawley rats were divided into three groups: sham-operated, I/R, I/R+PA. Rats were given PA (100 mg/kg/day peroral) 7 days prior to I/R. All rats except sham-operated underwent 60 min of bilateral renal ischemia followed by 6 h of reperfusion. After reperfusion, kidneys and blood were obtained for evaluation. Superoxide dismutase, glutathione peroxidase, malondialdehyde, protein carbonyl content, and nitrite/nitrate level (NO(x)) were determined in the renal tissue. Serum creatinine (S(Cr)), blood urea nitrogen (BUN), and aspartate aminotransferase (AST) were determined in the blood. Additionally, renal sections were used for histological grade of renal injury. RESULTS: PA significantly reduced the I/R-induced increases in S(Cr), BUN, and AST. In addition, PA markedly reduced elevated oxidative stress product, restored decreased antioxidant enzymes, and attenuated histological alterations. Moreover, PA attenuated the tissue NO(x), levels indicating reduced NO production. CONCLUSIONS: The pretreatment of rats with PA reduced the renal dysfunction and morphological changes, ameliorated cellular injury, and restored renal antioxidant enzymes caused by renal I/R.

A typical low-back pain caused by an atypical etiology.

OBJECTIVE: Pain arising in the lumbar spine can have many etiologies, nearly 80% of which cannot be established with certainty. We present a very rare cause of back pain. CASE REPORT: A 54-year-old woman presented with a 2-month history of low-back pain and right-sided sciatica. Conventional analgesics, physiotherapy, and epidural steroid application had failed to provide relief. She had tenderness of the right sacroiliac joint. Diagnostic fluoroscopic-guided sacroiliac-joint injection with lidocaine did not produce symptomatic relief. Pelvic ultrasonography and magnetic resonance imaging showed septated multilocular hydatic cysts along the sciatic nerve. Surgical exploration noted multicystic lesions along the sciatic nerve woven to the nerve. Her low-back pain disappeared completely after the operation. She received oral albendazole for 6 months to prevent any recurrence of the disease and remains asymptomatic. CONCLUSION: Hydatid cyst can be included in the differential diagnosis of lumbar back pain, especially in the endemic areas.

Accuracy of caudal epidural injection: the importance of real-time imaging.

Caudal epidural steroid injections are often used for low back pain. Fluoroscopic guidance has been frequently cited as a requirement for this procedure. In this preliminary report, we demonstrate that fluoroscopic guidance for caudal epidural Tuohy needle placement without real-time imaging may result in inadvertent intravenous injection of the drug. We detected intravenous leakage of the drug in 4 cases of 10 when real-time fluoroscopic imaging was used. Thus, real-time imaging may be recommended in addition to routine fluoroscopic guidance for caudal epidural procedures, as it may improve efficacy and safety by assuring accurate drug deposition.

Hearing impairment associated with spinal anesthesia.

OBJECTIVES: Hearing loss after spinal anesthesia has been reported to be related to the transmission of a reduced subarachnoid pressure to the inner ear via the cochlear aqueduct due to loss of spinal fluid. However, there are also some controversies related to this phenomenon, which require systematic investigation. MATERIAL AND METHODS: The effect of spinal needle diameter on hearing loss was investigated using audiometric tests in a prospective comparative study of 30 patients who were scheduled for surgery with spinal anesthesia. The bony structure of the cochlear and vestibular aqueducts was determined from temporal bone CT scans. RESULTS: Four out of 15 patients (26.67%) treated with a 22 G spinal needle demonstrated hearing loss the day after surgery, which recovered within 2-5 weeks. However, none of the patients treated with a 27 G spinal needle had statistically significant hearing loss in either ear at any frequency. Three out of four patients with hearing loss had an acute-onset balance problem. There was no difference between the two groups in terms of the widths of the vestibular and cochlear aqueducts. CONCLUSIONS: It has been shown audiometrically that the diameter of the spinal needle used to induce spinal anesthesia seems to have an effect on subsequent hearing loss. The patency of the bony canal determines the transmission of pressure changes to the inner ear. However, the individual risk of this complication is not predictable as there is no radiological abnormality of the canal.

The efficiency and duration of the analgesic effects of musical therapy on postoperative pain.

OBJECTIVES: The aim of this study was first to find out the effect of music therapy on postoperative analgesia and second to determine the duration of its effect. METHODS: Seventy patients who were undergoing elective cesarean delivery were enrolled. The patients were randomly allocated into two groups as follows: In Group 1, patients listened to music through a headphone for one hour after surgery, while in Group 2, patients did not listen to any music during the same period. In the postanesthesia care unit, patients were connected to a Patient Controlled Analgesia (PCA) device. The PCA device (tramadol 3 mg/ml) was set to deliver a bolus of 20 mg, with a lockout interval of 15 min and 4-hour maximal dose of 150 mg. Postoperative pain was assessed with a visual analog scale (VAS) and consumption of tramadol was recorded at 4, 8, 12, 16, 20 and 24 hours. RESULTS: There was a significant decrease in Group 1 with respect to PCA delivery frequency at the 4th hour postoperatively (p<0.05). Concerning the postoperative tramadol consumption, values measured at the 4th hour were significantly lower in Group 1 (p<0.05). The total amount of tramadol consumption and additional analgesic use in the postoperative 24 hours were again lower in Group 1 when compared with Group 2 (p<0.05). All VAS values were lower in Group 1 when compared with Group 2 (p<0.05). CONCLUSION: We suggest that music therapy given after surgery decreases postoperative pain in the first 24 hours and the analgesic consumption during the first four hours.

Pressure-controlled vs volume-controlled ventilation during laparoscopic gynecologic surgery.

STUDY OBJECTIVE: To quantify and compare the effects of conventional volume-controlled ventilation (VCV) with the alternative mode, pressure-controlled ventilation (PCV), on respiratory mechanics and noninvasive hemodynamic parameters in patients undergoing laparoscopic gynecologic surgery. DESIGN: Randomized controlled trial (Canadian Task Force classification I). SETTING: Respiratory mechanics and hemodynamic parameters were recorded for each patient at time T1, 10 minutes after induction, in the supine position; T2, 15 minutes after pneumoperitoneum, in the Trendelenburg position; and T3, 10 minutes after pneumoperitoneum withdrawal, in the supine position. PATIENTS: Sixty women, aged 20 to 50 years, undergoing laparoscopic gynecologic surgery, with American Society of Anesthesiologists classes I and II disease. INTERVENTIONS: Patients were randomly allocated to 1 of 2 groups. In the VCV group (n = 30), ventilation mode was maintained, whereas in the PCV group (n = 30), ventilation mode was changed to PVC. MEASUREMENTS AND MAIN RESULTS: Both groups were comparable insofar as patient characteristics, operating time, pneumoperitoneum time, anesthesia time, and mean operative time. VCV was associated with a significant increase in peak airway pressure, plateau pressure, and airway resistance at T2 (p < .05). Compliance was significantly higher in the PCV group at T2 (p < .05). No other statistically significant differences were found between the groups. CONCLUSIONS: Both VCV and PCV seem to be equally suited for use in patients undergoing laparoscopic gynecologic surgery. However, lower peak airway pressure, plateau pressure, and airway resistance, and higher compliance are observed with PCV in laparoscopic gynecologic surgery.

Acute and maintenance electroconvulsive therapy for treatment of psychotic depression in a pregnant patient.

Depression may relapse during pregnancy in women with a history of depression. Treatments which may be effective for mothers may be harmful to the fetus. Electroconvulsive therapy (ECT) has been widely used in patients with different medical illnesses. It is safe, and its efficacy is well established. In our example, the patient was a 34-year-old white woman who was at 13 weeks' gestation at the time of admission to our hospital. Over a 1-month period, the patient underwent a total of 13 ECTs (3 times a week) and 3 more ECTs monthly until the birth of her child. After 10th ECT, the Hamilton Depression Rating Scale score was reduced from 33 before ECT to 7. After 3 more weekly ECTs, the patient was discharged from the hospital with a Hamilton Depression Rating Scale score of 3. The patient was instructed to continue maintenance treatment with ECT sessions monthly. Except for pelvic pain and transient fetal arrhythmias, no complications were reported. Thus, acute and maintenance ECT may be the choice of treatment in severely depressed or psychotic pregnant patients.

Does preemptive stellate ganglion blockage increase the patency of radiocephalic arteriovenous fistula?

OBJECTIVE: Radio-cephalic arteriovenous fistulas (AVFs) have high early failure ratio. Increased sympathetic activity and spasm of radial artery during the surgery may responsible for early occlusion rate. DESIGN: Fifty patients were randomized to two groups (each containing 25 patients). Stellate Ganglion Blockade (SGB) was performed in Group 1. Another group was considered as control group (Group 2) to make statistical comparisons. All AVFs were performed under local anesthesia in both groups. RESULTS: Average fistula flow was 201.4+/-40.4 ml/min in Group 1 and 155.6+/-27.4 ml/min in Group 2 (p < 0.001). While average peak velocity of radial artery was 167.1+/-31.3 cm/sec in Group 1, it was 107.8+/-15.8 cm/sec in Group 2 (p < 0.001). Thrill was found in all Group 1 patients, but there was thrill only 13 of the Group 2 patients (p < 0.001). Mean maturation time was 41.4+/-6.8 days after surgery in Group 1 and 77.1+/-10.5 days in Group 2 (p < 0.001). Adequate vascular access was obtained 19 patients in Group 1 and 12 patients in Group 2 (p = 0.041). CONCLUSION: AVF occlusion rate is much more common in early postoperative period. Diminished sympathetic tonus by preemptive SGB not only increases early patency rate but also increases fistula maturation rate.