Menu Expand
Handbook of Equine Emergencies E-Book

Handbook of Equine Emergencies E-Book

Debra Catherine Archer

(2013)

Additional Information

Abstract

There are approximately 5,780 vets in the UK seeing horses regularly and 800 final year students per year studying equine. Equine emergencies (e.g. Musculoskeletal, Respiratory, Ophthalmic or Foal) are regular occurrences: most vets are not called out regularly enough to become specialists, but do need to know enough to treat these emergencies. The idea of this book is to be a quick practical reference guide that a vet could keep handy in such emergencies. Currently there are no other easy to use pocketbooks on this subject in the market.

The existing Equine Emergencies texts are either aimed at horse owners or are too detailed to be useful in this context, very large and include uncommon equine emergencies and advanced techniques that are irrelevant to the mixed practitioner.

- Suitable for all equine practitioners

- Concise and practical layout and content

- Accessible online downloads


Table of Contents

Section Title Page Action Price
Front Cover Cover
Handbook of Equine Emergencies iii
Copyright Page iv
Contents v
Preface xiii
Acknowledgements xv
Dedication xvii
Abbreviations and symbols xix
1 The basics 1
General approach to dealing with equine emergencies 1
Useful information and paperwork to have 2
Equipment 2
Horse handling and restraint 5
Communication with clients and legal records 5
Biosecurity 6
Dealing with other emergency services/rescue authorities 6
Referral of horses 7
Next time…. 7
Normal values and drug dosages (see formulary on http://www.\requineemergencieshandbook.com/) 7
Appendix 11
Normal values for an equine adult 12
2 Wounds and other integumentary emergencies 16
Wounds 16
Advice to owner/agent prior to arrival 16
Initial first aid and history taking 16
Administer first aid as appropriate 16
Obtain a full history 16
Perform a full clinical examination 17
Initial physical examination 17
Perform a detailed examination of the wound(s) 17
Further assessment and treatment 19
Primary closure of wounds 25
Staples and suture materials 26
Drains 27
Wound dressings and bandaging 27
Second intention/delayed primary closure (tertiary healing) 27
Ongoing care 27
Analgesia/anti-inflammatory medication 27
Antimicrobial therapy 29
General aftercare 29
Urticaria 29
Clinical signs 29
Assessment and treatment (Fig. 2.11) 29
Cellulitis/lymphangitis 30
Clinical signs 31
Initial assessment 31
Treatment and prognosis 31
Burn injuries 32
Initial first aid and assessment 32
Perform wound management 34
Make a plan for ongoing treatment including wound management 34
Frostbite 35
Clinical signs 35
Treatment 35
Gunshot injuries 35
Initial assessment and treatment 36
References and further reading 36
3 Musculoskeletal emergencies 38
General approach to acute, severe lameness 38
Advice over the telephone 38
Initial assessment and first aid 39
Further assessment 39
Further diagnostic evaluation and aftercare 40
Solar abscess and nail bind 42
Clinical signs 42
Initial assessment and treatment 42
If an abscess cannot be found 43
Solar penetrations 43
Initial approach 43
Management of superficial foot penetrations 44
Further investigation and treatment of deep foot penetrations 44
Acute laminitis 45
Clinical signs 45
Initial assessment and treatment 45
Prognosis 47
Synovial sepsis 47
Clinical signs 47
Initial assessment 48
If involvement of a synovial structure is considered highly unlikely 48
If synovial sepsis is obvious or highly likely (Fig. 3.3) 48
Prognosis 50
Acute tendonitis 50
Clinical signs 50
Initial assessment and treatment 51
Further assessment and prognosis 52
Tendon lacerations, ruptures or displacements 52
Clinical signs 52
Initial assessment and first aid 52
Prognosis with surgical management 53
Fractures/joint luxations 53
Clinical signs 53
Initial first aid and assessment 53
Further assessment 55
Treatment and prognosis 55
Exertional rhabdomyolysis syndrome (ERS) 55
Clinical signs 55
Initial assessment and treatment 55
Ongoing management 56
Prognosis 56
Atypical myopathy 56
Clinical signs 56
Initial assessment and first aid 56
Further evaluation 57
Prognosis 57
References and further reading 58
4 Oral and gastrointestinal emergencies 59
Colic 59
Epidemiology 59
Advice to the owner/carer 59
Initial assessment 60
Initial treatment and management 62
Ongoing management 65
Medical therapy for specific types of colic 65
Pelvic flexure impaction 65
Large colon displacement 65
Referral of horses with colic 66
Grain (carbohydrate) overload 66
Initial information to obtain 66
Assessment and treatment immediately after carbohydrate ingestion 66
Assessment and treatment of clinical signs that develop as a \rconsequence of ingestion of large quantities of carbohydrate 67
Prognosis 67
Equine grass sickness (equine dysautonomia) 67
Clinical signs 68
Assessment and diagnosis 68
Treatment 68
Traumatic abdominal injuries 68
Potential sequelae following abdominal trauma 69
Initial assessment 69
Oesophageal obstruction (choke) 69
Clinical signs 69
Initial advice to the owner/carer 69
Initial evaluation 69
Initial treatment 70
Subsequent management of uncomplicated cases 70
Cases refractory to initial treatment on further examination 71
Advanced assessment and treatment of refractory cases 71
5 Respiratory emergencies 85
Respiratory distress (dyspnoea) 85
Advice to the owner/carer 85
Initial assessment and first aid 86
Further assessment following stabilisation 86
Treatment and further evaluation 87
Pneumonia/pleuropneumonia 88
Predisposing factors 88
Clinical signs 89
Diagnosis 89
Treatment and prognosis 89
Prognosis 90
Inhalational pneumonia 90
Treatment 90
Aspiration of liquid paraffin (mineral oil) 91
Prognosis 91
Pulmonary oedema 91
Clinical signs 91
6 Ophthalmic emergencies 105
General approach 105
First aid 105
Assessment 106
Treatment 107
Ocular and periocular trauma 108
Initial approach 108
Eyelid lacerations 109
General points 109
Initial assessment 109
Treatment 110
Suturing of lacerations 110
Aftercare 112
Corneal lacerations 112
Initial assessment 112
Treatment 113
Orbital fractures 113
Initial approach 114
Treatment 115
Acute retinal detachment 115
Hyphaema 115
Initial investigation 115
7 Neurological emergencies 127
Approach to neurological emergencies 127
General approach 127
Neurological examination 128
Assessment of the head and cranial nerves 129
Assessment of spinal reflexes and muscles 131
Dynamic assessment (if safe to perform/not recumbent) 131
Neurological examination of the recumbent horse 132
Assessment and plan 132
Traumatic injury to the CNS 132
General approach to management 135
Clinical signs 135
Head trauma 136
Spinal cord trauma (see Table 7.4) 136
Initial assessment and treatment 136
Initial treatment plan 137
Control pain and inflammation 137
Control cerebral oedema 137
Maintain systemic blood pressure 137
Maintain blood oxygen levels 137
Other treatment 137
Ongoing assessment and treatment 137
Cranial nerves 138
Peripheral nerve syndromes 138
General approach to treatment of acute-onset peripheral nerve syndromes 138
Ataxia 140
Initial stabilisation and assessment 140
Further assessment and treatment 142
Prognosis 143
Equine herpes myeloencephalitis 144
History, clinical signs and diagnosis 144
Treatment and prognosis 144
Seizures 144
Clinical signs 144
Advice to owner/carer over the telephone 145
Initial approach 146
Ongoing management and further assessment 146
Encephalitis 147
Management 147
Biosecurity and zoonotic risk 148
Meningitis 148
Clinical signs 148
Diagnosis and treatment 148
Tetanus 148
Clinical signs and progression 148
Diagnosis 149
Treatment 149
Eliminate the source of toxin 149
Neutralise unbound toxin and stimulate an immune reaction 149
Provide analgesia and control muscle spasms 150
Supportive and nursing care 150
Prognosis 150
Botulism 150
Clinical signs 150
Initial approach and diagnosis 151
Treatment and prognosis 151
References and further reading 152
8 Reproductive emergencies 153
Approach to emergencies in the pregnant/postpartum mare 153
Dystocia 154
Advice to client 154
Get there ASAP! 154
Initial assessment 156
Decide on the next course of action 156
Assisted vaginal delivery (AVD) 157
Controlled vaginal delivery (CVD) 157
Caesarean section 158
Embryotomy 158
If all else fails 158
Aftercare 158
Abortion/stillbirth 159
Action following abortion/stillbirth of unknown cause 159
Retained foetal membranes (RFM) 160
Initial assessment 160
Treatment 161
Metritis 161
Clinical signs 161
Initial assessment and treatment 161
Periparturient haemorrhage 162
Clinical signs 162
Initial approach 162
Stabilisation 163
Uterine torsion 163
Clinical signs 163
Diagnosis 163
Treatment 164
Uterine prolapse 164
Clinical signs 164
Advice to owner/carer over the telephone 165
Initial assessment and treatment 165
Replacement of the uterus within the abdomen 165
Aftercare 166
Uterine tears 166
Initial diagnosis and treatment 166
Vaginal tears 166
Initial assessment 167
Treatment 167
Perineal injuries 167
Mastitis 168
9 Urinary tract emergencies 176
Acute urine discoloration 176
Possible causes of urine discoloration 176
Initial approach 177
Further investigation and treatment 177
Further assessment and treatment 179
Acute renal failure (ARF) 179
Pathogenesis 180
Clinical signs 180
Initial assessment and diagnosis 180
Urinary tract obstruction 181
Clinical signs 181
Initial approach 181
Further evaluation and treatment 182
Bladder eversion 182
Clinical signs 182
Treatment 182
Aftercare 182
Bladder displacement/prolapse 183
Clinical signs 183
Diagnosis and treatment 183
Ruptured bladder 184
Acute-onset urinary incontinence 184
References and further reading 184
10 Cardiovascular emergencies 185
Cardiac arrest 185
Severe haemorrhage 186
Clinical signs 186
Advice to the owner/carer 187
Initial first aid 187
Further assessment and treatment 189
Cardiac dysrhythmias 190
Initial assessment 190
Initial treatment 192
Further investigation and treatment 192
Heart failure 192
Clinical signs 193
Approach 194
Further assessment and treatment 194
Prognosis 195
Endocarditis 195
Clinical signs 195
Initial approach 195
Further assessment and treatment 196
Prognosis 196
Pericarditis/pericardial effusion 196
Clinical signs 197
Initial approach 197
Further evaluation and treatment 197
Acute haemolytic anaemia 197
Clinical signs 199
Initial assessment 199
Further investigation and treatment 199
Vasculitis 199
Clinical signs 200
Possible causes 200
Diagnosis and treatment (Fig. 10.5) 200
References and further reading 201
11 Hepatic, endocrine and metabolic emergencies 202
Acute hepatic disease 202
Clinical signs of hepatic encephalopathy 203
Initial assessment 203
Initial treatment for hepatic encephalopathy (if present) 205
Initial supportive treatment 205
Ongoing monitoring and treatment 205
Prognosis 205
Hyperlipaemia 206
Pathogenesis 206
Clinical signs 207
Diagnosis 207
Initial assessment 207
Management of mild/suspected cases of early hyperlipaemia 208
Advanced care of cases with severe clinical signs and no GIT motility 208
Severe starvation 209
Clinical signs 209
Initial assessment and first aid treatment 209
Initial nutrition of the emaciated horse following chronic starvation 210
Ongoing care and monitoring 211
Prognosis 211
Exhaustion syndrome 211
Clinical signs 212
Diagnosis 212
Initial treatment 212
Treatment of more severe cases: 213
Prognosis 213
Synchronous diaphragmatic flutter/thumps 214
12 Emergencies in foals 218
The basics 218
Handling and clinical examination 219
Medications 219
Sedation 219
<4 weeks old 219
>4 weeks old 220
Emergency anaesthesia 222
Resuscitation of the neonatal foal 222
Foals that are more likely to require CPR 222
What next? 224
The sick neonatal foal 224
High-risk foals 225
History 225
Initial clinical assessment 225
Initial treatment 225
Monitoring and ongoing care 228
Referral of the sick foal 230
Prematurity/dysmaturity 230
Clinical signs 230
Treatment 230
Failure of passive transfer of immunity 230
Treatment 231
Septicaemia 231
Clinical signs 231
Initial assessment and treatment 232
Neonatal maladjustment syndrome (perinatal asphyxia syndrome) 232
Clinical signs 232
Mild 232
More severe 233
Initial assessment and treatment 233
Ongoing treatment and prognosis 233
Severe flexural limb deformities 233
Septic arthritis 235
Clinical signs 235
Diagnosis 235
Treatment 235
Prognosis 235
Colic 235
Possible causes 236
Initial assessment 236
Assessment and plan 237
Diarrhoea 237
Initial treatment and diagnostic investigations 237
Ongoing treatment 238
Respiratory distress 238
Possible causes 238
Initial assessment and first aid treatment 239
Rib fractures 239
Clinical signs 239
Diagnosis 239
Treatment 239
Guttural pouch tympany 239
Seizures 240
Clinical signs 240
Mild 240
Severe 240
Possible causes 240
Control seizures 240
Treatment 241
Prognosis 241
Recumbency/collapse 241
Shaker foal syndrome (toxicoinfectious botulism) 241
Clinical signs 241
13 Emergencies in donkeys and mules 247
The basics 247
General points 247
Some useful facts 248
Normal clinical values (Table 13.1) 248
Haematology and biochemistry 249
Clinical examination and techniques 249
Handling 249
Injections and blood sampling 249
Nasogastric intubation 249
Rectal examination 249
Medications 250
Sedation 250
Sedation of needle-shy/difficult-to-handle donkeys and mules 251
Epidural anaesthesia 251
General anaesthesia in emergency situations 251
General anaesthesia 251
Emergency anaesthetic protocols 251
Overview of emergency conditions 252
The dull donkey 255
History 255
Clinical examination 256
Initial treatment 256
Laminitis 256
Colic 257
Epidemiology 257
Clinical examination 257
Treatment 257
Typhlocolitis 258
14 Iatrogenic emergencies 261
General approach 261
Rectal tears 262
Initial assessment and first aid 262
Further assessment and treatment 263
Complications following nasogastric intubation 264
Epistaxis 264
Inhalational pneumonia 264
Oesophageal perforation 265
Complications following castration 265
Post-castration haemorrhage 265
Evisceration 266
Initial advice to the owner (Fig. 14.2) 266
Initial assessment and treatment 266
Where referral is an option 267
Omental prolapse 267
Adverse drug reactions 267
Diagnosis and treatment 267
Anaphylaxis 270
Intracarotid drug administration 270
Clinical signs 270
15 Infectious diseases 276
Overview 276
General points to consider 276
Useful sources of information 277
Notifiable diseases 278
Global coordination of equine infectious diseases – OIE 278
National/regional regulations 278
Notifiable diseases in the UK 278
Zoonotic diseases 278
Bioterrorism 279
Approach to management of an outbreak of suspected infectious \rdisease 279
Identify the problem and potential pathogens that may be involved 290
Implement immediate steps to manage the problem 291
Confirm the diagnosis 293
Implement ongoing management and disease investigation 293
References and further reading 294
16 Poisoning, bites and stings 295
General approach to suspected poisoning 295
Situations that may increase suspicion of potential poisoning 295
Initial advice to owner/carer 296
Initial assessment and first aid 296
Further investigation 297
Treatment plan 303
Where contact poisoning has occurred 303
Ingested toxins 303
Increase toxin elimination 303
Antidotes 303
Ongoing supportive care and treatment 303
Snake bites 304
General points about snake bites 304
Clinical signs 304
Immediate first aid 304
Further assessment and treatment 305
Antivenin treatment 306
Prognosis 306
Insect bites 306
Stinging nettles 306
References and further reading 307
17 Other specific emergency situations 308
Trapped horses 308
Prior to arriving at the scene 309
On arrival at the scene 310
Techniques for freeing trapped horses 311
Following freeing of the horse 311
Collapsed/recumbent horse 313
Control the situation and administer first aid 314
Further clinical assessment 314
Make an assessment and initial treatment plan 315
Further investigations and treatment/prognosis 317
Electrocution 317
18 Other essentials 326
Sudden death 326
Approach to investigation 326
Euthanasia and insurance issues 328
General points 328
Guidelines issued for euthanasia 328
What to do when performing euthanasia in the insured horse 330
Preparation for dealing with emergencies at competitions 330
Dealing with emergencies at equine competition brings a \rfew additional pressures 330
Initial arrangements 330
Preparation prior to the event 332
On the day 332
During the event 333
At the end of the event 333
Extreme floods/high winds 334
Wildfires – if there is a known, impending risk 334
Where a wildfire is close-by 334
Extreme cold weather 334
Disaster preparedness/dealing with adverse weather conditions 334
References and further reading 335
19 How to… 336
Perform injections/blood sampling 337
Locations for IM injections 337
Equipment for IM injections 337
Technique for IM injections 337
Location for IV injections 337
Equipment for IV injections 337
Technique for IV injections 337
Blood sampling 338
Pass a nasogastric tube 339
Equipment 339
Procedure 339
Complications 340
Normal findings/quantity of fluid to administer 340
Perform abdominocentesis 341
Contraindications 341
Equipment 341
Procedure 341
Normal peritoneal fluid 343
Abnormal peritoneal fluid 343
Perform a rectal examination 344
Contraindications/increased risk of rectal tears 344
Equipment 344
Procedure 344
Assessment of rectal findings 344
Complications 345
Perform synoviocentesis in cases of suspected synovial sepsis 346
Contraindications 346
Equipment 346
Procedure 347
Evaluation of synovial fluid 347
Synoviocentesis of selected synovial structures 348
Metacarpophalangeal/metatarsophalangeal (fetlock) joint 348
Digital flexor tendon sheath 350
Antebrachiocarpal and middle carpal joints 352
Tarsocrural joint 355
Perform a tracheotomy 356
Equipment 356
Procedure 356
Sedate a fractious/dangerous horse 358
Horses that are difficult to inject IV 358
IM sedative mixture 358
Horses that are difficult to inject IM 359
Oral detomidine 359
Remote injection using a pole syringe 359
Remote injection 359
Impossible to catch/restrain 360
Emergency reversal of sedation 360
Use sedation infusions 360
Equipment 360
Detomidine infusion 360
Xylazine infusion 360
Anaesthetise a horse in an emergency 361
Equipment 361
Factors to consider beforehand 361
Anaesthetic protocol 361
Sedation/premedication 361
Induction of anaesthesia 361
Maintenance of anaesthesia 361
'Triple drip' combinations 362
Inhalational anaesthesia 362
Other considerations 362
Perform caudal epidural anaesthesia 362
Equipment 362
What to inject 362
Technique 362
Perform local anaesthetic nerve blocks of the head 365
Equipment 365
Choice of nerve block 366
Auriculopalpebral nerve block 367
Supraorbital/frontal nerve block 367
Infraorbital nerve block 368
Mental nerve block 370
Infratrochlear nerve block 371
Lacrimal nerve block 372
Zygomatic nerve block 372
Place an IV catheter 372
Equipment 372
Which catheter to use 372
Where to place 373
How to place 373
What not to do 373
Complications 374
Administer IV fluids in the field 374
Equipment 374
Administering fluids 374
Work out how much and what types of fluid to administer 375
Perform a blood/plasma transfusion 376
Equipment/materials 376
Obtain blood/plasma 376
Donor horse 376
Plasma 377
± Cross-match blood (see texts) 377
How much blood to give 378
How to give 378
Place a subpalpebral lavage system 379
Equipment 379
Technique 379
Maintenance and removal 380
Bandage a limb and foot 382
Equipment 382
Technique 382
Foot dressings 383
Place a Robert Jones bandage and splints on a limb with a \rsuspected fracture 383
Equipment 383
Technique 383
Isolate a potentially infectious horse 387
Facilities/equipment 387
Ensure that all personnel know the procedures for isolation 387
Cleaning/disinfection 387
Perform euthanasia 387
Checklist before performing euthanasia 387
Performing euthanasia 388
Examine a placenta and investigate a case of abortion/stillbirth 388
Examination of the placenta 388
Post-mortem examination of foetus/neonate 391
Perform a field post-mortem 392
Issues to consider prior to proceeding 392
Initial procedure 393
External examination 394
Internal examination 394
Where lesion(s) are identified document: 395
Samples to take 395
References and further reading 395
Index 397