Taking knee arthroplasty as an example , patients deemed at low risk of experiencing outcomes such as postoperative pain or chronic pain  may receive intra-articular local anaesthesia infiltration ;  patients at medium risk may obtain additional analgesia via a saphe-nous nerve catheter ; and patients at high risk may also receive nerve blocks and anti-hyperalgesics .
pain and function after fast-track hip and knee arthroplasty .
catastrophizing , response to experimental heat stimuli , and post-cesarean section pain .
In 1946 , Mendelson 1 showed that pulmonary complications and death could arise in pregnant women because of aspiration of gastric contents .
Since then , prevention of aspiration of gastric contents has contributed significantly to a decrease in maternal deaths .
Warner and colleagues 2 demonstrated in a large series from the Mayo Clinic that no aspiration occurred in pregnant or post-partum women ( probably because of the routine use of prophylactic measures ) , while both its occurrence and severity were significant in emergency procedures .
formation of large informatic data bases , or clinical quality registries , linking preoperative and intraoperative clinical data , imaging , genomics , and cancer and drug prescription data bases .
References 1 Fischer HB , Simanski CJ , Sharp C , et al. A procedure-specific systematic review and consensus recommendations for postoperative analgesia following total knee arthroplasty .
Postoperative pain management : number-needed-to-treat approach versus procedure-specific pain management approach .
Does adding milk to tea delay gastric emptying?
BACKGROUND Many preoperative fasting guidelines suggest that hot tea or coffee with milk added should be considered similar to solid food , allowing an interval of 6 h before commencing anaesthesia . There is little evidence to support these instructions , with recent guidelines undecided on the issue . This study aim ed to establish whether there was a clinical ly significant delay in gastric emptying associated with adding a modest amount of milk to tea . METHODS This r and omized controlled crossover study was conducted in 10 healthy volunteers . The  paracetamol absorption technique and real-time ultrasound measurement of the cross-sectional area of the gastric antrum were used to assess gastric emptying after ingestion of 300 ml of black tea or 300 ml of tea with milk ( 250 ml black tea plus 50 ml of full fat milk ) . RESULTS The mean difference in the time to reach the peak paracetamol concentration ( tmax ) was -8 min [ 95 % confidence interval ( CI ) -23.1 to 7 ] in favour of tea with milk . Ultrasound assessment indicated that the geometric mean of the half-time to gastric emptying ( T₁/₂ ) after tea without milk was 22.7 ( 95 % CI 12.7 - 40.9 ) min and after tea with milk 23.6 ( 95 % CI 13.5 - 41.0 ) min ( ratio 1.04 ) ( 95 % CI 0.47 - 2.29 ) . CONCLUSIONS This study demonstrated no difference in gastric emptying times when a modest amount of milk was added to tea . These findings suggest that it may be acceptable to allow patients to add a small quantity of milk to their tea or coffee and follow the same fasting restrictions applied to clear fluids
Taking knee arthroplasty as an example , patients deemed at low risk of experiencing outcomes such as postoperative pain or chronic pain  may receive intra-articular local anaesthesia infiltration ;  patients at medium risk may obtain additional analgesia via a saphe-nous nerve catheter ; and patients at high risk may also receive nerve blocks and anti-hyperalgesics .
pain and function after fast-track hip and knee arthroplasty .
catastrophizing , response to experimental heat stimuli , and post-cesarean section pain .
In 1946 , Mendelson 1 showed that pulmonary complications and death could arise in pregnant women because of aspiration of gastric contents .
Since then , prevention of aspiration of gastric contents has contributed significantly to a decrease in maternal deaths .
Warner and colleagues 2 demonstrated in a large series from the Mayo Clinic that no aspiration occurred in pregnant or post-partum women ( probably because of the routine use of prophylactic measures ) , while both its occurrence and severity were significant in emergency procedures .
formation of large informatic data bases , or clinical quality registries , linking preoperative and intraoperative clinical data , imaging , genomics , and cancer and drug prescription data bases .
References 1 Fischer HB , Simanski CJ , Sharp C , et al. A procedure-specific systematic review and consensus recommendations for postoperative analgesia following total knee arthroplasty .
Postoperative pain management : number-needed-to-treat approach versus procedure-specific pain management approach .