Predictive Factors for Hypotensive Bradycardic Events During Arthroscopic Shoulder Surgery

N/ACompletedNCT01926561

Daegu Catholic University Medical Center68 enrolled

Overview

Patients's demographics and perioperative factors affect the occurrence of hypotensive bradycardic events in the patients undergoing arthroscopic shoulder surgery in the sitting position under interscalene block.

Patients' age, Side of the block,Horner's syndrome, the degree of blockade, preoperative fasting time and fluid administration volume, waiting time for sitting position after the block, intraoperative use of opioids and antihypertensives, and change of heart rate variability before the block and after sitting position affect the occurrence of hypotensive bradycardic events in the patients undergoing arthroscopic shoulder surgery in the sitting position under interscalene block.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Syncope, Vasovagal

Interventions

Interscalene brachial plexus blockOTHER

After sterile draping around interscalene groove with povidone, a nerve stimulating needle connected to a nerve stimulator is inserted through the interscalene groove. Following involuntary contraction of shoulder, arm, forearm, or hand muscles with 0.5 milliamperes at 1 Hz using the nerve stimulator, 30 to 40 ml of mixture of 1% mepivacaine 20 ml and 0.75% ropivacaine 20 ml are injected.

Eligibility

Sex: ALLMin age: 15 YearsMax age: 80 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Age between 15 and 80 years * American Society of Anesthesiologists physical status I-II * Body mass index \< 35 kg/m2 Exclusion Criteria: * Coagulation deficiencies * Known allergies to local anesthetics * Neurologic deficit on the side to be operated * Inflammation at the puncture site for interscalene brachial plexus block * Coronary artery disease * Cardiac conduction disorders and arrhythmias * Congestive heart disease * Diabetes mellitus * Serum electrolyte abnormalities * Autonomic dysfunction * Psychiatric disorders * Patients refusal * Communications difficulties * Failure of interscalene brachial plexus block

Locations (1)

Daegu Catholic University Medical Center

Daegu, South Korea

Outcomes

Primary Outcomes

Patient's age and gender, fasting time, administered volume, blood pressure, and heart rate variability

Patients'age and gender, preoperative fasting time and volume of fluid administered, pre-block mean arterial pressure and heart rate, logarithmically transformed low frequency, high frequency, and total power of heart rate variability

Time frame: Prior to ISBPB

Secondary Outcomes

Side of the block, volume of local anesthetics used, number of patients having Horner's syndrome, hoarseness, and subjective dyspnea, degree of dermatomal and motor blockade

Side of the block, volume of local anesthetics used, number of patients having Horner's syndrome (ptosis, miosis, and anhidrosis), hoarseness, and subjective dyspnea, degree of dermatomal blockade (C5, C6, C7, C8, and T1), and degree of motor blockade (median, ulnar, radial, and musculocutaneous nerve)

Time frame: 20 minutes after the end of local anethetics injection

Waiting time for sitting position, heart rate variability, mean arterial pressure, heart rate, frequency of antihypertensives and opioids use, and onset of hypotensive bradycardic events

Waiting time for sitting position (time from the end of interscalene brachial plexus block to the sitting position), logarithmically transformed high frequency, low frequency, and total power of heart rate variability, mean arterial pressure, heart rate, frequency of intraoperative use of antihypertensives and opioids, and onset of hypotensive bradycardic events

Time frame: after the sitting position (expected average of 2 hours including surgery readiness time and duration of surgery)

Data from ClinicalTrials.gov

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