Clinical evaluation of a new tracheal impedance cardiography method.

Non-invasive cardiac output measurement by means of impedance cardiography has been evaluated before, and agreement with other methods has been variable. We decided to study a newly developed tracheal impedance device, that is claimed to be more accurate and reliable. This incorporates new software and mathematical formulae, that are designed to reduce signal noise from diathermy, leading to improved accuracy. In 25 cardiothoracic surgery patients, simultaneous measurements were performed using both pulmonary artery thermodilution and the tracheal impedance device, at five peri-operative time points: before skin incision; after weaning from cardiopulmonary bypass; after sternal closure; and 30 min and 2 h after arrival in the intensive care unit. Mean cardiac output, bias and 95% limits of agreement were 5.3, 0.03 and -2.8 to 2.8 l.min(-1) , respectively. Tracheal impedance showed good correlation with measurement trends using thermodilution in 88% of measurements, with a mean (95% limit of agreement) angular bias of -9.0° (-83.3 to 65.3°). However, the wide limits of agreement and high percentage error of 53% that were apparent in this study mean that, in its present guise, tracheal impedance is not an acceptable alternative to thermodilution in cardiac surgical patients.

[Suicide attempt with sotalol: a proarrhythmic intoxication]. / Tentamen suicidii met sotalol: een proaritmische intoxicatie.

A 62-year-old man was brought into the intensive care unit because of a cardiac arrest. After extensive resuscitation, including defibrillation, sinus bradycardia occurred with marked QT prolongation, followed by recurrent episodes of torsade de pointes. Hetero-anamnestic data revealed a suicide attempt with sotalol. Treatment consisted largely of temporary pacing using an external transvenous overdrive pacemaker and administration of glucagon, milrinon and norepinephrine. Eventually, the patient was discharged in good condition. A suicide attempt with sotalol is a rare intoxication with considerable morbidity and mortality. Treatment is primarily based upon counteracting the proarrhythmic effects of sotalol. However, even when therapeutic levels of this drug are used, proarrhythmic effects can occur.

Open or laparoscopic preperitoneal mesh repair for recurrent inguinal hernia? A randomized controlled trial.

BACKGROUND: Giant prosthetic reinforcement of the visceral sac (GPRVS), an open preperitoneal mesh repair, is a very effective groin hernia repair. Laparoscopic transabdominal preperitoneal repair (TAPP), based on the same principle, is expected to combine low recurrence rates with minimal postoperation morbidity. METHODS: Seventy-nine patients with 93 recurrent and 15 concomitant primary inguinal hernias were randomized between GPRVS (37 patients) and TAPP (42 patients). Operating time, complications, pain, analgesia use, disability period, and recurrences were recorded. RESULTS: Mean operating time was 56 min with GPRVS versus 79 min with TAPP (p < 0. 001). Most complications were minor, except for a pulmonary embolus and an ileus, both after GPRVS. Patients experienced less pain after a laparoscopic repair. Average disability period was 23 days with GPRVS versus 13 days with TAPP (p = 0.03) for work, and 29 versus 21 days, respectively (p = 0.07) for physical activities. Recurrence rates at a mean follow-up of 34 months were 1 in 52 (1.9%) for GPRVS versus 7 in 56 (12.5%) for TAPP (p = 0.04). Hospital costs in U.S. dollars were comparable, with GPRVS at $1,150 and TAPP at $1,179. CONCLUSIONS: Laparoscopic repair of recurrent inguinal hernia has a lower morbidity than GPRVS. However, laparoscopic repair is a difficult operation, and the potential technical failure rate is higher. With regard to recurrence rates, the open preperitoneal prosthetic mesh repair remains the best repair.

The effect of paracetamol, fentanyl, and systematic assessments on children's pain after tonsillectomy and adenoidectomy.

Various clinical protocols are used to manage early postoperative tonsillectomy and/or adenoidectomy (T&A) pain in children. Although believed to be effective, these protocols are not evidenced-based. Therefore, a double-blind, randomized, placebo controlled (2 x 2) factorial design was used (1) to evaluate the effectiveness of 2 pain protocols used interchangeably to manage early postoperative T&A pain and (2) to investigate whether nurses' systematic pain assessments improve pain management. In the first protocol children receive a loading dose (30 to 50 mg/kg) of paracetamol (acetaminophen) Formularium der Nederlandse Apothekers (Formulary of the Dutch Royal Society for the Advancement of Pharmacy) intraoperatively, followed by regular doses (70 to 100 mg/kg/24 hours) of paracetamol. In the second protocol children receive the first protocol, plus intramuscular fentanyl citrate (1 microgram/kg) intraoperatively. Subjects were 83 healthy children between the ages of 3 and 12 years, admitted for T&A as an outpatient procedure. The child's pain was measured using observation scales (Children's Hospital of Eastern Ontario Pain Scale and Face Legs Activity Cry Consolability Scale), a visual analogue scale, and self-report measures (Faces Pain Scale and Oucher). Neither pain protocol sufficiently relieved early postoperative T&A pain, and systemic pain assessments did not improve the effectiveness of analgesics. Further research evaluating the effectiveness of pain management protocols is needed.

Bassini repair compared with laparoscopic repair for primary inguinal hernia: a randomised controlled trial.

OBJECTIVE: To compare the effectiveness of open and laparoscopic primary inguinal hernia repair. DESIGN: Randomised controlled trial. SETTING: University hospital, The Netherlands. SUBJECTS: 87 patients had 103 open repairs and 88 patients had 114 laparoscopic repairs between November 1993 and July 1995. INTERVENTIONS: Laparoscopic repair by the transabdominal preperitoneal (TAPP) technique and open repair by the Bassini technique. MAIN OUTCOME MEASURES: Recurrence, morbidity, pain, and duration of convalescence. RESULTS: Operating time was longer for laparoscopy (mean (SD): 82 (28) compared with 45 (15) minutes p < 0.001). Patients in the Bassini group had higher postoperative pain scores (mean (SD)VAS: 2.9 (1.6) compared with 2.0 (1.6) p=0.002), used more analgesics (median total intake: 2 (0-54) compared with 0 tablets (0-42) p=0.008), and needed a longer convalescence time (mean (SD) time to return to work: 22 (12.6) compared with 14 (10.1) days p < 0.001; mean (SD) time to return to physical activities: 27 (12.6) compared with 17 (12.2) days p < 0.001). Mean follow up was 24 months. Recurrence rates were 21% (22/ 103) after Bassini and 6% (7/114) after laparoscopic repair (p=0.001). CONCLUSION: Laparoscopic hernia repair is a safe operation, which has obvious advantages over the Bassini repair in terms of pain, use of analgesic drugs, resumption of activities, and recurrence. A disadvantage of the laparoscopic repair is the longer operating time.