Anesthetic Management of Patient with Diabetes Mellitus

You are an anaesthesiologist at the district hospital and have an appointment with patient Mr. Prochazka from the Department of Long-Term Care and Aftercare (80 years old, DM, COPD) for a preanaesthetic assessment before undergoing femoral amputation of the right lower limb for ischemia. He has already done an outpatient preoperative evaluation including the physical examination and some routine laboratory tests (coagulation tests, the complete blood count, fasting blood glucose, electrolytes and kidney function tests).
What further examinations are required?
80
years
100
kg
man
RR
18 /min
HR
85 /min
SpO2
94 %
BP
138/90 (106) mmHg
Examination
Anamnesis & Examination:
Past Medical History: Diabetes Mellitus type 2 (approximately 40 years), COPD (Moderate GOLD 2 severity), Mild class I obesity (BMI 31, 100 kg), arterial hypertension
Past surgeries: one year ago distal phalanx of the hallux and second finger amputation
Medications: Metformin 500 mg 3 times a day after meals.
Losartan - 50 mg once a day, Serevent® (salmeterol) - inhaler, 2 times a day 50 mg
Substance abuse/Habits: Ex-smoker - stopped 15 years ago (since 18 years old roughly 20 cigarettes per day)
Glycaemia
Gly
8,9  mmol/L
Complete blood count
HGB
130  g/L
HTC
0,46
ERC
4,5  x1012/L
LEU
11  x109/L
PLT
200  x109/L
Coagulation
INR
0,9
aPTT
28 s
Biochemical analysis
Na
140  mmol/L
K
4,5  mmol/L
Cl
105  mmol/L
Mg
0,7  mmol/L
Ca
2,3  mmol/L
P
1  mmol/L
Glycaemia
Take a sample
Complete blood count
Take a sample
Coagulation
Take a sample
Biochemical analysis
Take a sample