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Ambulatory Anaesthesia and Surgery |
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Recovery Characteristics after Ambulatory Anaesthesia and Surgery |
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Mohamed Ezzat Moemen |
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Recovery: |
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Recovery is a frequently used term in anaesthetic and surgical practice. This term may be perceived very differently among patients, surgeons and anaesthetists . |
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Patients consider that recovery ensues when they are able to resume their previous life-style. |
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Surgeons consider that their patients have recovered when surgical sutures are removed or when their patients are discharged from the hospital. The variable most often used by surgeons to assess recovery is the duration of patient hospital stay. |
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Anaesthetists think that their patients have recovered when they regain their consciousness and preoperative physiological and psychological states. |
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Anaesthetists deal with recovery as a continual process, the early stage of which overlaps the end of intraoperative care. The recovery process may last many days and can be divided into three distinct phases. |
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Early (phase I) recovery lasts from discontinuation of anaesthesia until patients awaken and regain their vital protective reflexes and motor functions. |
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Intermediate (phase II) recovery denotes immediate clinical recovery as coordination and ambulation allowing home-readiness. |
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Patients are then discharged home to complete full recovery including its psychological component, a stage termed late (phase III) recovery. |
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Early (Phase I) recovery: |
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Early (phase I) recovery takes place in the postanaesthesia care unit (PACU) under the care of trained nurses until patients have recovered enough to allow their safe transfer to an ambulatory surgical unit (ASU) or to another secondary step-down phase II recovery area. This is usually achieved by using the Aldrete and Kroulik or the modified Aldrete scoring system . Recently, the Bispectral Index (BIS) is evolving as a useful indicator of patient wakefulness in the operating room (OR) and the PACU to be transferred to step-down phase II recovery area. |
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The Aldrete scoring system: |
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The Aldrete and Kroulik scoring system was first described in 1970. This system assigns a score of 0-2 to activity, respiration, circulation, consciousness and colour, giving a maximum score of 10 (table 1). A score of ≥ 9 indicates sufficient patient recovery for transference from the PACU to the phase II recovery area. Although not originally designed for ambulatory surgical patients, this scoring system is still used in many PACU’s. |
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Table (1): The standard Aldrete scoring system (5) |
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Points |
Activity |
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Able to move 4 extremities |
2 |
Able to move 2 extremities |
1 |
Able to move 0 extremities |
0 |
Respiratory |
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Able to deep breath and cough freely |
2 |
Dyspnea, shallow or limited breathing |
1 |
Apneic |
0 |
Circulation |
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Preoperative BP ± 20 mmHg of preanaesthetic level |
2 |
Preoperative BP ± 21 to 49 mmHg of preanaesthetic level |
1 |
Preoperative BP ± 50 mmHg of preanaesthetic level |
0 |
Consciousness |
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Fully awake |
2 |
Arousal on calling |
1 |
Not responding |
0 |
Colour |
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Normal |
2 |
Pale, dusky, blochy |
1 |
Cyanotic |
0 |
Total score |
10 |
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The modified Aldrete scoring system: |
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With the advent of pulse oximetry as a more reliable indicator of oxygenation than clinical observation, a modified Aldrete scoring system has been designed (table 2) . In this modified system, the colour parameter of the original system is replaced by an oxygen or room-air saturation parameter. Again, the maximum score is 10 and a score of ≥9 indicates sufficient patient recovery for transference form the PACU to phase II recovery area. |
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Table (2): The modified Aldrete scoring system |
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Points |
Activity |
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Able to move 4 extremities |
2 |
Able to move 2 extremities |
1 |
Able to move 0 extremities |
0 |
Respiratory |
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Able to deep breath and cough freely |
2 |
Dyspnea, shallow or limited breathing |
1 |
Apneic |
0 |
Circulation |
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Preoperative BP ± 20 mmHg of preanaesthetic level |
2 |
Preoperative BP ± 21 to 49 mmHg of preanaesthetic level |
1 |
Preoperative BP ± 50 mmHg of preanaesthetic level |
0 |
Consciousness |
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Fully awake |
2 |
Arousal on calling |
1 |
Not responding |
0 |
Oxygen saturation |
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Able to maintain oxygen saturation > 92% on room air |
2 |
Needs oxygen inhalation to maintain oxygen saturation > 90% |
1 |
Oxygen saturation < 90% even with oxygen supplementation |
0 |
Total score |
10 |
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The Bispectral Index: |
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The Bispectral Index (BIS) is a multivariate index derived from the spontaneous electroencephalogram (EEG) (10). It uses a processed EEG to monitor anaesthetic depth . The electrodes or the sensors of this monitor are attached to three circles on the patient. The first is a forehead contact 4cm above the nose. The second is a contact above the right or left orbit. The third is a contact on the temple between the hair-line and the outer angle of the orbit. |
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The BIS determines a linear and a non-linear component. It uses a space lab monitor for a numeric zone and moving wave-form updated every two seconds. It produces a unitless score of zero to 100, where 100 means that the patient is awake and responsive, 70 means that free recall is lost and 60 means that consciousness is lost. Below a BIS value of 60, there is a very low probability of patient recall. The range between 60 and 50 may denote deep sedation or light anaesthesia, and below 50, the patient is usually unconscious . |
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The use of BIS has been shown to allow more accurate titration and more economic utilization of anaesthetic agents , to reduce time to wakefulness and extubation and to promote faster theatre turnaround. Intraoperative BIS monitoring could produce significant improvements in patient orientation on arrival at PACU and time to discharge eligibility. A recent large prospective study compared the recovery characteristics of 50-40 range BIS monitored ambulatory surgical patients with controls using the modified Aldrete score . |
| On arrival to the PACU, the study group patients had better ventilatery functions, more stable haemodynamics and they were more awake and active. So, they had higher modified Aldrete scores, which produced safer and shorter PACU stay with better recovery characteristics contributing to patient transfer to the step-down phase II recovery area.
It can be concluded that a postoperative BIS score more than 70 allows patient transfer to the PACU or even his fast-tracking to the ASU. |
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The fast-tracking scoring system |
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Newer anaesthetics and techniques may allow more rapid awakening and phase I early recovery may be completed in the OR. Then, patients are transferred directly to the ASU, bypassing the PACU, a process known as fast-tracking . |
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Table (3): Criteria for fast-tracking after outpatient anaesthesia (19) |
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Points |
Level of consciousness |
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Awake and oriented |
2 |
Arousable with minimal stimulation |
1 |
Responsive only to tactile stimulation |
0 |
Physical activity |
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Able to move all extremities on command |
2 |
Some weakness in movement of extremities |
1 |
Unable to voluntarily move extremities |
0 |
Haemodynamic stability |
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BP < 15% of baseline MAP value |
2 |
BP 15-30% of baseline MAP value |
1 |
BP > 30% of baseline MAP value |
0 |
Respiratory stability |
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Able to breath deeply |
2 |
Tachypnea with good cough |
1 |
Dyspneic with weak cough |
0 |
Oxygen saturation status |
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Maintains value > 90% on room air |
2 |
Requires supplemental oxygen (nasal prongs) |
1 |
Saturation < 90% with supplemental oxygen |
0 |
Postoperative pain assessment |
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Non or mild discomfort |
2 |
Moderate to severe pain controlled with iv analgesics |
1 |
Persistent severe pain |
0 |
Postoperative emetic symptoms |
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Maintains value > 90% on room air |
2 |
Transient vomiting or retching |
1 |
Persistent moderate to severe nausea and vomiting |
0 |
Total score |
14 |
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MAP = mean arterial pressure |
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The proposed fast-tracking scoring system takes in consideration pain and emetic symptoms, added to the modified Aldrete five parameters completing 14 scoring points. A minimal score of 12 (with no score < 1 in any individual category) would be required for a patient to bypass the PACU after ambulatory general anaesthesia and surgery. |
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Clinical guidelines: |
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Wetchler suggested clinical guidelines for safe patient discharge after ambulatory surgery (table 4). |
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Table (4): Wetchler’s guidelines for safe patient discharge after ambulatory surgery |
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Vital silgns stabe: these include temperature, pulse, respiration and blood pressure when appropriate. Vital signs should remain stable for a period of not less than half an hour and be consistent with patient’s age and preanaesthesia levels. |
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Ability to swallow and cough: the patient must demonstrate the ability to swallow fluids and be able to cough. |
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Ability to walk: the patient demonstrates ability to perform movement consistent with age and developmental level (sit, stand, and walk). |
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Minimal nausea, vomiting and dizziness: |
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Minimal nausea: absence of nausea, or if nausea is present, the patient can still swallow and retain some fluids. |
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Minimal vomiting: vomiting is either absent or, if present, does not require treatment. Following vomiting that requires treatment, the patient should be able to swallow and retain fluids. |
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Minimal dizziness: dizziness is either absent or present only upon sitting and the patient is still able to perform movement consistent with age. |
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Absence of respiratory distress: the patient exhibits no signs of snoring, obstructed respiration, stridor, retractions, or croupy cough. |
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Alert and oriented: the patient is aware of surroundings and what has taken place and is interested in returning home. |
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Again, Kortilla summarized widely accepted clinical criteria for safe discharge after ambulatory surgery (table 5). |
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Table (5): Kortilla’s guidelines for safe patient discharge after ambulatory surgery |
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Vital signs must have been stable for at least one hour |
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The patient must be: |
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Oriented to person, place and time |
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Able to retain orally administered fluids |
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Able to void |
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Able to dress |
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Able to walk without assistance |
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The patient must not have |
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More nausea and vomiting. |
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Excessive pain. |
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Bleeding. |
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The patient must be discharged by both the person who administered anaesthesia and the person who performed surgery, or by their designates. Written instructions for the postoperative period at home, including a contact place and person, must be reinforced. |
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The patient must have a responsible, “vested” adult escort them home and stay with them at home. |
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Clinical criteria: |
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The postanaesthesia discharge scoring system (PADSS) |
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Apart from psychomotor tests and clinical guidelines, Chung (1993) designed his early version of postanaesthesia discharge scoring system (PADSS) including 10 points and patients with scores of ≥9 are considered fit for home discharge (table 6) . In this way patient discharge is addressed in a simple, clear and reproducible manner to meet national medical standards. Nurses are able to evaluate the postoperative course of the patient in a systematic way. |
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Table (6): Postanaesthesia discharge scoring system (PADSS) |
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Points |
Vital signs |
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Within 20% of preoperative value |
2 |
20% - 40% of preoperative value |
1 |
< 40% of preoperative value |
0 |
Activity, mental status |
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Oriented and steady gait |
2 |
Oriented or steady gait |
1 |
Neither |
0 |
Pain, nausea, vomiting |
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Minimal |
2 |
Moderate |
1 |
Severe |
0 |
Surgical bleeding |
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Minimal |
2 |
Moderate |
1 |
Severe |
0 |
Intake, output |
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Has had postoperative fluids and voided |
2 |
Has had postoperative fluids or voided |
1 |
Neither |
0 |
Total score |
10 |
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The modified postanaesthesia discharge scoring system (MPADSS): |
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Removing the requirements to drink and to void (elimination of input and output), and separating the PONV and pain elements, Chung et al has modified the early version of the PADSS into the modified postanaesthesia discharge scoring system (MPADSS) , which was extensively used at the Toronto Hospital for determining home-readiness.
The MPADSS is based on five criteria: vital signs, ambulation, PONV, pain and surgical bleeding (table 7).
Each of these items is assessed independently and assigned a numerical score of 0-2, with a maximal score of 10. Patients are fit for discharge when their score is ≥9. Patients should be able to stand and take few steps or to sit upright if the surgical procedure does not permit standing. Delays in discharge are related to persistent symptoms such as pain, PONV, hypotension, dizziness, unsteady gait, syncope, asthma or unavailable accompanying care-given . The MPADSS is a simple way to establish a routine of repeated re-evaluation which may result in improved patient supervision. |
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Table (7): the modified postanaesthesia discharge scoring system (MPADSS) |
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Points |
Vital signs |
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Vital signs must be stable and consistent with age and preoperative baseline |
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BP and pulse within 20% of preoperative baseline |
2 |
BP and pulse within 20%-40% of preoperative baseline |
1 |
BP and pulse > 40% of preoperative baseline |
0 |
Activity level |
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Patient must be able to ambulate at preoperative level |
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Steady gait, no dizziness, or meets preoperative level |
2 |
Requires assistance |
1 |
Unable to ambulate |
0 |
Nausea and vomiting |
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Patient should have minimal nausea and vomiting before discharge |
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Minimal: successfully treated with PO medication |
2 |
Moderate: successfully treated with IM medication |
1 |
Severe : continues after repeated treatment |
0 |
Pain |
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Patient should have minimal or no pain before discharge. The level of pain should be accepted to the patient. Pain should be controllable by oral analgesics. The location, type, and intensity of pain should be consistent with anticipated postoperative discomfort. |
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Acceptability: |
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Yes |
2 |
No |
1 |
Surgical bleeding |
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Postoperative bleeding should be consistent with expected blood loss for the procedure. |
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Minimal: does not require dressing change |
2 |
Moderate: up to two dressing changes required |
1 |
Severe: three or more dressing changes required |
0 |
Total score |
10 |
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BP = blood pressure, PO = per orum, IM = intramuscular |
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Table (8): The modified Bomage Scale for motor block |
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• = full movement 1 = loss of hip flexion. 2 = loss of knee extension 3 = loss of planter flexion/ extension |
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One factor limiting the popularity of spinal anaesthesia for ambulatory surgery is postdural puncture headache (PDPH). However, it has been recently documented that needles of gauge ≥ 25 produce an incidence of PDPH of < 1% and that the reported headaches are mild and self-limited. |
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Table (9): Postoperative instructions for outpatients following ambulatory surgery procedures. |
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Activities postsurgery: Rest today- You may experience some dizziness or drowsiness following surgery procedure.
- Do not consume alcohol, drive or make important personal or business decisions for 24h.
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Activity level: see procedure specific instructions |
Diet postsurgey:
- Progress as tolerated without nausea and vomiting
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Medications post surgery: -
Medications taken prior to surgery should be resumed as ordered by your physician.
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Mild aches, pains are not unusual and may be relieved by acetaminophen or similar non-aspirin pain medication postoperatively.
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A prescription for other pain medication may be given by your doctor postoperatively. Take as instructed.
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In an emergency: Call your doctor immediately for problems such as:-
Bladder difficulties
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Persistent nausea or vomiting
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Bleeding that does not stop
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Unusual pain
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Fever
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Redness/ swelling or drainage of pus
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Call your doctor. If unable to contact your doctor, you may contact or go to the hospital emergency department. |
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Late (Phase III) recovery: |
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Recovery does not end once discharge criteria are met, because phase III recovery may take few days to be completed at home. Patients and their escorts are provided with written discharge instructions and information about emergency medical assistance if needed. It is a good practice to plan a follow-up telephone call from the ambulatory unit 24 hours after discharge to review postoperative progress and satisfaction (table 12). Additional contact with the patient is recommended if s/he has received spinal or epidural anaesthesia or if s/he has some additional difficulty postoperatively. |
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Table (10) Postoperative evaluation phone-call |
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Date and time or postoperative call ____/ ____ / _____ |
Problems since discharge: |
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1- Appetite / nausea |
( ) Yes |
( ) No |
2- Vomiting |
( ) Yes |
( ) No |
3- Score throat |
( ) Yes |
( ) No |
4- Headache |
( ) Yes |
( ) No |
5- Backache |
( ) Yes |
( ) No |
6- Muscle ache |
( ) Yes |
( ) No |
7- Pain at operative site |
( ) Yes |
( ) No |
8- Temperature |
( ) Yes |
( ) No |
9- Bleeding |
( ) Yes |
( ) No |
10- Drowsiness |
( ) Yes |
( ) No |
11- Pediatric patients:
alterations in comfort / pain ______________________________ |
12- Other problems
__________________________________________
_______________________________________________________ |
Physician follow-up required regarding problems found? |
( ) Yes |
( ) No |
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Physician name |
Physician signature |
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It is important to mention that home-readiness after an outpatient surgery carried out under any anaesthetic technique does not coincide with street-fitness. Kortilla studied the effects of different analgesics, sedatives and anaesthetics on the psychomotor skills of volunteers and recommended that patients should refrain from driving for 24 and 48 hours if the duration of surgery was less than 30 minutes or equal to two hours respectively. |
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Ref: |
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Eg J Anaesth 2004 ,20 :449-57 |