Parenteral sedation of elderly patients with acute behavioral disturbance in the ED

Purposes

This study aimed to investigate sedation of elderly patients with acute behavioral disturbance (ABD) in the emergency department (ED), specifically the safety and effectiveness of droperidol.

Basic Procedures

This was a prospective study of elderly patients (> 65 years) with ABD requiring parenteral sedation and physical restraint in the ED. Patients were treated with a standardized sedation protocol that included droperidol. Drug administration, time to sedation, additional sedation, and adverse effects were recorded. Effective sedation was defined as a drop in the sedation assessment tool score by 2 or a score of zero or less.

Main Findings

There were 49 patients with median age of 81 years (range, 65-93 years); 33 were males. Thirty patients were given 10 mg droperidol, 15 were given 5 mg droperidol, 2 were given 2.5 mg, and 2 were given midazolam. Median time to sedation for patients receiving 10 mg droperidol was 30 minutes (interquartile range, 18-40 minutes), compared with 21 minutes (interquartile range, 10-55 minutes; P = .55) for patients receiving 5 mg droperidol. Three patients were not sedated within 120 minutes. Eighteen patients required additional sedation—10 of 30 (33%; 95% confidence interval, 18%-53%) given droperidol 10 mg compared with 7 of 15 (47%; 95% confidence interval, 22%-73%) given 5 mg. Fourteen patients required resedation. Adverse effects occurred in 5 patients (hypotension [2], oversedation [2], hypotension/oversedation [1])—2 of 30 given 10 mg droperidol and 3 of 19 not treated according to protocol. Midazolam was given initially or for additional sedation in 2 of 5 adverse effects. No patient had QT prolongation.

Principal Conclusions

Droperidol was effective for sedation in most elderly patients with ABD, and adverse effects were uncommon. An initial 5-mg dose appears prudent with the expectation that many will require another dose.     

Changes in blood pressure and heart rate during sedation with ketamine in the pediatric ED

Background

Ketamine is commonly used in the emergency department for short, painful procedures. We describe changes in blood pressure (BP) and heart rate (HR) during procedural sedation with ketamine, as these changes have not been well described in children.

Propofol for deep procedural sedation in the ED

We sought to evaluate the use of propofol (2,6-diisopropylphenol) for ED procedural sedation, particularly when administered in a routine fashion for a variety of indications. METHODS: This was a prospective observational study conducted in an urban teaching ED. Propofol was administered by handheld syringe and combined with fentanyl. Measurements included propofol and fentanyl dose, serial vital signs, pulse oximetry, adverse events, and patient and physician satisfaction. RESULTS: One hundred thirty-six subjects (18 to 69 years) were enrolled. Procedures included 82 (60.3%) abscess incision and drainages and 47 (34.6%) orthopedic reductions. Adverse events occurred in 14 cases (10.3%; 95% confidence interval 5.2% to 15.4%), including hypotension in 5, hypoxemia in 7, and apnea in 5. One patient required intubation. Both patient and physician satisfaction were excellent. CONCLUSIONS: ED procedural sedation with propofol was effective and well accepted by patients and physicians. However, it produced a significant incidence of hypotension, hypoxemia, and apnea.     

Incidence and severity of recovery agitation after ketamine sedation in young adults

PURPOSES: Psychic recovery reactions after ketamine administration are not uncommon in adults, but yet are rare in children 15 years old and younger. The nature of such reactions has not been previously described in young adults, and accordingly we wished to quantify the incidence and severity of recovery agitation after ketamine sedation in patients aged 16 to 21 years. BASIC PROCEDURES: We prospectively collected data on 26 young adults aged 16 to 21 years who received ketamine for emergency department procedures, and treating physicians rated recovery "agitation," "crying," and "unpleasant hallucinations or nightmares" each on a 100-mm visual analog scale (0 mm="none," 100 mm="worst possible"). MAIN FINDINGS: Treating physicians rated agitation and crying as entirely absent (rating 0 mm) in 25 of the 26 patients, and unpleasant hallucinations or nightmares as entirely absent (0 mm) in all 26. The single occurrences each of agitation (rating 46 mm) and crying (rating 23 mm) were not severe and resolved spontaneously without treatment. PRINCIPAL CONCLUSIONS: In this small sample of young adults we observed no serious psychic recovery reactions, mirroring the low incidence of such responses well documented with children 15 years old and younger. This supports the expansion of ketamine use to young adults aged 16 to 21 years.     

Safety of sedation with ketamine in severe head injury patients: comparison with sufentanil

OBJECTIVE: The aim of the study was to compare the safety concerning cerebral hemodynamics of ketamine and sufentanil used for sedation of severe head injury patients, both drugs being used in combination with midazolam. DESIGN: Prospective, randomized, double-blind study. SETTING: Intensive care unit in a trauma center. PATIENTS: Twenty-five patients with severe head injury. INTERVENTIONS: Twelve patients received sedation with a continuous infusion of ketamine-midazolam and 13 with a continuous infusion of sufentanil-midazolam. All patients were mechanically ventilated with moderate hyperventilation. MEASUREMENTS AND MAIN RESULTS: Prognostic indicators (age, Glasgow Coma Scale scores, computed tomography diagnosis, and Injury Severity Scale score) were similar in the two groups at study entry. Measurements were carried out during the first 4 days of sedation. The average infusion rates during this time were 82 +/- 25 micro x kg x min ketamine and 1.64 +/- 0.5 microg x kg x min midazolam in the ketamine group and 0.008 +/- 0.002 microg x kg x min sufentanil and 1.63 +/- 0.37 microg x kg x min midazolam in the sufentanil group. No significant differences were observed between the two groups in the mean daily values of intracranial pressure and cerebral perfusion pressure. The numbers of intracranial pressure elevations were similar in both groups. The requirements of neuromuscular blocking agents, propofol, and thiopental were similar. Heart rate values were significantly higher in the ketamine group on therapy days 3 and 4 ( <.05). With regard to arterial pressure control, more fluids were given on the first therapy day and there was a trend toward greater use of vasopressors in the sufentanil group. Sedative costs were similar in the two groups. CONCLUSION: The results of this study suggest that ketamine in combination with midazolam is comparable with a combination of midazolam-sufentanil in maintaining intracranial pressure and cerebral perfusion pressure of severe head injury patients placed under controlled mechanical ventilation.     

Cetirizine and loratadine: a comparison using the ED50 in skin reactions

To quantify objectively the comparative potencies of the antihistamines, loratadine and cetirizine, we determined the dose that inhibits histamine-induced skin reactions by 50% of the maximum response (ED50) for each drug. Cetirizine at 2.5, 5 or 10 mg, loratadine at 10, 20 or 40 mg or placebo were given to 14 healthy female subjects in a randomized double-blind crossover design. Inhibition of the wheal and flare response to the histamine prick test (10, 100 and 500 mg/ml) was evaluated. Depending on the histamine concentrations, the ED50s for wheals were in the ranges 4.3 - 4.7, 2.1 - 2.2 and 1.7 - 1.9 mg cetirizine, 2, 4 and 6 h after dosing, respectively. For loratadine, the ED50 for wheals were in the ranges 35.6 - > 40, 9.1 - 24.1 and 9.1 - 13.9 mg, 2, 4 and 6 h after dosing, respectively. Calculation of the ED50 demonstrated that, on average, cetirizine is seven to nine times more potent than loratadine at inhibiting wheal and flare reactions.     

Prospective comparison of cardiopulmonary events during minilaparoscopy and colonoscopy under conscious sedation

BACKGROUND AND STUDY AIMS: Cardiorespiratory parameters were examined throughout diagnostic minilaparoscopy procedures. The same parameters were analyzed during colonoscopy, and the data were compared. PATIENTS AND METHODS: Sixty-five consecutive unselected patients undergoing minilaparoscopy (group 1: ASA I, n = 34; group 2: ASA II/III, n = 31) and 61 consecutive unselected patients undergoing colonoscopy (group 3: ASA I, n = 31; group 4: ASA II/III, n = 30) were included. Oxygen saturation (Sao (2)), heart rate (HR) and mean arterial pressure (RRm) were measured continuously, and 12-lead electrocardiography (ECG) recordings were made at specific times during each procedure. RESULTS: Minor differences were observed, particularly after premedication, probably due to different dosage regimens and timing in the two examination techniques. After premedication, testing for differences from baseline values showed a minor decrease in Sao (2) and RRm in the minilaparoscopy groups in comparison with the colonoscopy groups (median Sao (2), group 1: 99.9 % +/- 0 vs. group 3 : 100 % -1, P = 0.0078; median RRm, group 1: 99.5 - 4 mm Hg vs. group 3 : 96 -16 mm Hg, P = 0.046, and median RRm, group 2 : 110 + 1 mm Hg vs. group 4 : 101 -13.5 mm Hg, P = 0.0007). HR increased in minilaparoscopy in comparison with colonoscopy (median HR: group 2 : 77 + 4 beats/min vs. group 4 : 75.5 +/- 0 beats/min; P = 0.01). Comparison of defined relevant pathological changes in Sao (2), RRm, HR, and ECG showed no significant differences. DISCUSSION: These data indicate that diagnostic minilaparoscopy under conscious sedation is only associated with limited risk in patients with compensated cardiopulmonary diseases. This is probably due to the low insufflation pressure used.     

Low-dose ketamine analgesia: patient and physician experience in the ED

ObjectiveLow-dose ketamine (LDK) may be useful for treatment for opioid-tolerant patients. We conducted a survey of patients and their treating clinicians regarding LDK for analgesia.MethodsSurvey data included the following: vital signs and pain score before and after LDK, demographics, and adverse effects. Treating physicians were queried about reasons for use of LDK and overall satisfaction.ResultsTwenty-four patients were enrolled: 21 received LDK for analgesia, and 3 received LDK for sedation. Pain level on a visual analog scale (range, 1-10) after LDK was significantly decreased from 8.9 ± 2.1 to 3.9 ± 3.4 (P < .0001). Change in vital signs after administration of LDK was not statistically significant. Overall patient satisfaction with LDK was 55%, and overall physician satisfaction was 72%. Sixteen (67%) of patients would prefer LDK again, and 23 (96%) of physicians would use LDK again for analgesia. Four patients reported an adverse experience, but there were no emergence reactions. Race subanalysis revealed no difference in pain reduction, but whites were least satisfied compared with black and Hispanic patients (P = .02). Physician reasons for using LDK included opioid failure (88%), concern for respiratory depression (17%), concern for multiple opioid allergies (13%), and concern for hypotension (8%). Most (96%) physicians believed that LDK is underused.ConclusionLow-dose ketamine may decrease patients' perception of pain. Most were satisfied with LDK for this purpose and would use it again. Whites were least satisfied with the use of LDK for analgesia. Physicians believed that ketamine is underused.     

Prolonged sedation and airway complications after administration of an inadvertent ketamine overdose in emergency department.

The use of ketamine for pediatric sedation in the Emergency Department for painful procedures has become increasingly popular. Ketamine is a safe and effective sedative for diagnostic or therapeutic procedures in the Emergency Department. Sedation with this dissociative agent produces a rapid onset action, potent analgesia, adequate sedation, amnesia and minimal side effects. We report a case of prolonged sedation and airway complications after administration of an inadvertent intramuscular ketamine overdose in a healthy child.     

Midazolam or ketamine for procedural sedation of children in the emergency department

A short cut review was carried out to establish whether ketamine or midazolam is superior at providing safe and effective conscious sedation in children in the emergency department. A total of 203 papers were found using the reported searches, of which four presented the best evidence to answer the clinical question. The author, date and country of publication, patient group studied, study type, relevant outcomes, results and study weaknesses of these best papers are summarised in table 1. It is concluded that midazolam and ketamine have similar efficacy and safety profiles but that ketamine is preferred by parents and physicians.     

Adverse events associated with ketamine for procedural sedation in adults

Study Objectives

Ketamine is widely used as a procedural sedation agent in pediatrics, where its safety and efficacy are supported by numerous studies. Emergency physicians use ketamine infrequently in adults, as it is believed to have a more significant side effect profile in this population. However, adult data on ketamine use in the emergency medicine literature are sparse. Our objective was to determine ketamine's adverse effect profile in adults when used for procedural sedation.

Methods

We performed a literature review based on adverse effect research methodology recommendations. PubMed, EMBASE, TOXNET, and a variety of specialized databases were queried without regard to publication date or language. Experts were contacted to locate additional data.Inclusion criteria included adult study; ketamine used to facilitate the performance of painful procedures; dose of at least 1 mg/kg intravenous or at least 2 mg/kg intramuscular; original data and adverse events reported; spontaneously breathing patient, and no continuous cotherapies. Studies that met inclusion criteria were abstracted onto structured forms and their results qualitatively summarized.

Results

Of the 5512 unique citations that were evaluated, 87 met criteria for inclusion. Most studies were performed in the 1970s and published in the anesthesia literature. Contexts, end points, and methodological quality varied widely across studies. Ketamine reliably produces conditions that facilitate the performance of painful procedures. Pharyngeal reflexes are generally preserved and cardiovascular tone stimulated, including a rise in blood pressure and myocardial oxygen demand. Laryngospasm and airway obstruction are reported, and though ketamine is a respiratory stimulant, a brief period of apnea around the time of injection is common. Reports of significant cardiorespiratory adverse events are rare, despite ketamine's frequent use in austere, poorly monitored settings. Dysphoric emergence phenomena occur in 10% to 20% of cases; sedating medications are effective in preventing and managing these reactions.

Conclusion

When ketamine is used for procedural sedation in adults, emergence phenomena occur in 10% to 20% of patients. Although providers must be prepared to recognize and manage airway obstruction, cardiorespiratory adverse events are rare and typically do not affect outcomes.