The investigators use bicarbonate injected to an intravenous line and the changes in the exhaled end-tidal carbon dioxide to verify whether the IV line is in the vein or surrounding tissue

The method was proved useful in previous phase I, II studies. Now the investigators move on to assess the method in a phase III study in oncological patients.

each patients which will be subjected to intravenous chemotherapy will be eligible ( see also inclusion/exclusion criteria).

Once consent obtained the patient will have an IV line placed. each line placed will be categorized by the clinical team into 3 categories:

1. IV in place ready to use for chemotherapy ( good blood return)
2. Doubtful position ( no blood return/ little blood return bu flushes well).
3. IV not in place. Study design Category 1. IV bicarbonate 4.2% 20 cc and NS 20 cc in a randomized fashion Category 2. same as above Category 3. No injections

Inclusion Criteria:

• age 18-80 oncological disease requires intravenous chemotherapy

Exclusion Criteria:

• 1. refusal to participate 2. lung disease acute or chronic sPo2 < 92%, PaCO2 > 50 3. renal failure Creatinine > 2 mg% 4. metabolic alkalosis HCO3 > 30 meq/L 5. medication that affect bicarbonate levels: Bicarbonate, Diamox, Fusid 6. obesity BMI > 38 7. congestive heart failure EF < 40 % or clinical signs of congestive heart failure